CHAPTER 403 - WEIGHTS AND MEASURES ACT: SUBSIDIARY LEGISLATION
INDEX TO SUBSIDIARY LEGISLATION
WEIGHTS AND MEASURES (ASSIZE) REGULATIONS<PW:Popup,2,2,Popup>These Regulations are continued in operation by virtue of section 15 of the Interpretation and General Provisions Act Reference to a Section of an Act in these regulations means reference to the Repealed Act.')1
Arrangement of Regulations
3. Permitted weighting instruments
5. Stamp of Assize
6. Seal of Assize
7. Rejection mark
8. Maximum capacity of denomination
10. Installation and use of weighing instruments
12. Conditions for refusal to assize
13. Description making on instrument
CLASSIFICATION OF WEIGHING INSTRUMENTS
14. Accuracy classes
15. Maximum permissible errors
16. General requirements for electronic weighing instruments
17. Test of visual characteristics
18. Metrological test procedures
20. Counter poise weights
21. Knife edges
22. Automatic weighing instrument
23. Test loads
24. Beam scales
25. Counter machines
26. Crane machines
27. Platform machines and weighbridges
28. Self indicating weighting instruments
29. Spring balances
30. Steelyards and wall beams
32. Precision weights
33. Dry measures of capacity
34. Measures of volume of liquids
35. Measures of length
36. Vehicle tank
38. Liquid measuring device
39. Petrol pumps
40. Fabric measuring instrument
41. Automatic measuring instrument
PUBLIC WEIGHING INSTRUMENTS
42. Provision and maintenance of public weighing instruments
43. Issue of certificate of competence
44. Assize fees
45. Determination of weights transmitted to the road by each axle
46. Qualifications for weights instrument attendants
47. Role of assizers and inspectors in over laden vehicles
48. Failure by attendants to execute their duties
49. Repeal of Weights and Measures (Assize) Regulations, 1971
SI 22 of 1998.
These Regulations may be cited as the Weights and Measures (Assize) Regulations, 1998.
In these Regulations, unless the context otherwise requires–
“accessories” means that part of a balance which serves for the additional representation, transfer or processing of measurement values and which can be connected, added or built into the balance;
“accuracy” means that behaviour or technical qualities of a measuring instrument showing its ability to indicate with sufficient exactness, the true magnitude to be measured;
“accuracy classes of balances” means accuracy classes corresponding to international guidelines for the EEC and OIM;
“additional tare device” means a device used to weigh or compensate a tare load and does not effect the weighting range of the balance;
“adjusting” means to set or compensate a measuring instruments or the embodiment of a measure in such a way that the indicated value deviates as little as possible from the actual value or that this deviation remains within the tolerance limits;
“attendant” means a person holding a certificate or competence and authorised to operate public weighting instruments;
“automatic calibration” means electronic device for the automatic recalibration of a measuring range;
“automatic zero setting” means an automatic zero setting device which makes it possible to correct zero point or soiling of load receivers without manual intervention;
“automatic zero setting” means an automatic zero setting device which makes it possible to correct zero point or soiling of load receivers without manual intervention;
“automatic measuring instrument” means a measuring instrument for the automatic measuring and filling of liquids into containers;
“beam balance” means a balance in which a load carrier is supported by a knife edge from which it is freely suspended;
“beam scale” means an equal armed weighing instrument, pans of which are below the beam;
“bulkflow meter” includes a vehicle tank metre and means a measuring instrument designed to measure fuel for individual deliveries of 500 litres or more whether or not individual deliveries of less than 500 litres may also be made with the same instrument;
“calibration device” means a device that can be set up separately from the balance or integrated in the balance and can be of the balance individually;
(a) in relation to a weighing instrument, the maximum load which it is constructed to weigh as marked on such instrument in accordance with the provisions of these regulations;
(b) in relation to a measure or measuring instrument, the maximum volume, qualify or length which it constructed to contain or measure as the case may be;
“certificate seal” means a stamp seal applied by the Assize Department to the tested measuring or weighing instrument to indicate that the calibration has been completed;
“commercial scale” means a scale or balance of accuracy which satisfies the certification requirements or the correspondence requirements for admission to being certified;
“confidence range” means a plus or minus range around the average x of a measuring value;
“compartment” in relation to a vehicle tank means a subdivided portion of that tank;
“counter scale” means an equal armed weighing, instrument of a capacity not exceeding 30 kilogrammes, the pans of which are above the beam;
“crane machine” means–
(a) a suspended equal armed compound lever weighing instrument fitted with a load hook suspended from knife edges and provided with poises moving over graduated scales to indicate weight; or
(b) a suspended self indicating hydraulic or spring actuated weighing instrument;
“creep error” means errors resulting when a measurement value is read, printed or processed before slowly settling to a final position;
“discrimination” means the ability of weighing instrument to react to small variations of load specified in these regulations;
“electronic weighing machine” means any self-indicating weighing machine in which the load produces electrical signals which are processed so as to indicate or record weight;
“error” in relation to an instrument, means the extent to which such instrument indicates in excess or deficiency of standard weight or measure;
“dead weight machine” means an equal armed weighing instrument of a capacity exceeding 50kg, the pans or platform of which are above the beam;
“difference chart” in relation to a weighing instrument means a chart on which, by means of a pointer or other indicates excess or deficiency form a predetermined weight is indicated;
“fabric measuring instrument” means a measuring instrument designed and constructed to measure and indicate the length of fabric or other material passed through it;
“Liquid measuring device” means a measuring instrument provided with a measuring chamber or chambers designed for filling barrels, bottles, drums or other containers with predetermined quantities of liquid for dispensing liquids in small quantities from bulk;
“petrol pump” means a measuring instrument provided with either a metre or one or more measuring chambers, designed to measure liquid fuel or lubricating oil for individual deliveries of less than 500 litres whether or not individual deliveries of more than 500 litres can also be made by means of the same instrument;
“platform machine” means an instrument other than a weighbridge used for determining the mass of a load supported on a platform not exceeding 3m in size 500kg load capacity and shall include any instrument prescribed by the superintendent Assizer as a platform machine;
“public weighing instrument” means an axle weigher or weighing meant for weighing goods’ vehicles;
“repaired” in relation to an instrument means that the instrument has, since it was last assized had an addition, replacement repair or adjustment made to a part which is essential to the use of such instrument;
“self-indicating weighing instrument” means a weighing instrument other than a spring balance on which the whole or part of the weight of the goods weighed is indicated by means of a pointer moving over a chart; or by means of a chart moving in relation to a fixed pointer, and any instrument prescribed by the Superintendent Assizer as self-indicating weighing instrument;
“sensitiveness” in relation to a weighing instrument means the actual weight which causes the beam or steelyard to turn;
“spring balance” means a weighing instrument having a capacity of less than 100kg in which weigh indications are dependent on the extension of springs and the load of which is below the spring and is suspended directly from them;
(a) a suspended unequal single lever weighing instrument, the shorter arm of which carries a load hook suspended from the knife edges whilst the longer arm is provided with a poise moving over a graduated scale to indicate weight; or
(b) a steelyard provided on a platform machine or weighbridge or other similar weighing instrument as the context requires.
“table” means the appropriate table of allowances, verification scale intervals, permitted Mass and Volume denominations and abbreviations of denominations prescribed in the First Second and Third Schedule;
“vehicle tank” means a measure mounted on a motor vehicle or trailer and used for measurement of liquid fuel;
“vibrating weighing instrument” means a weighing instrument so constructed that the beam or steelyard returns to or oscillates about the position of equilibrium;
“wall beam” means an unequal-armed multilever weighing instrument designated to be affixed to a wall, having a load hook suspended from knife edges on the lower lever, and provided with poises moving over graduated scales to indicate weight; and
“weighbridge” means a weighing instrument for weighing a load carried by a vehicle where the load and vehicle where the load and vehicle are supported on rails or platform wither of which is linked to a system of levers or load-cells, and includes any similar instrument prescribed as a weighbridge by the Superintendent Assizer.
A weighing instrument for use in accordance with the Act shall be–
(a) an equal oscillating arm, bean scale or beam balance, either suspended without arrestment device or otherwise supported with or without arrestment device;
(b) a counter machine of Roberval of Berannger pattern designed for equal load on each load receptor, but not a counter machine with sliding or tare weights nor a machine with unstable position of equilibrium;
(c) a steel yard or wall beam of a capacity exceeding 50Kg but not exceeding 1000kg, for use only for weighing animals or bulk agricultural products; or
(d) one of the following if it complies with the specification of the competent official authority in the country of the manufacturer;
(i) a platform scale;
(ii) a weighbridge;
(iii) a precision balance;
(iv) a self indicating weighing instrument including price computing and or printing electronic weighing machine;
(v) an automatic weighing machine; and
(e) if not used for trade, indelibly and clearly marked, “NOT FOR TRADE USE”.
The provisions of these Regulations shall not apply to–
(a) electricity metres; and
(b) gas metres.
The stamp of assize shall be a stamp incorporating the eagle the Armorial Ensigns of Zambia, the letter “GRZ”, a letter of the alphabet and a stamp bearing a number signifying the year of assize.
(1) The seal of assize shall be a lead seal bearing a stamp incorporating the eagle of the Armorial Ensigns of Zambia, the letters GRZ, a letter of alphabet and a stamp bearing a number signifying the year of assize.
(2) Where use is made of the seal or seals of assize under these regulations, the removal of any such seal from an assized instrument shall be deemed to render that instrument unassized.
(1) The rejection mark shall be a mark of six-pointed star design.
(2) An assizer shall reject an instrument under section 19 of the Act if–
(a) such instrument, bears a stamp of assize, by obliterating such stamp with a rejection mark;
(b) such instrument, does not bear a stamp of assize by stamping the rejection mark in a suitable position thereon; or
(c) such instrument bears a seal of assize, by removal of such seal.
(1) The capacity of a weighing instrument shall be clearly and conspicuously stamped on the beam, steel yard or on a metal plate permanently secured to some prominent part of the instrument.
(2) The capacity of a fabric measuring instrument shall be clearly and conspicuously stamped thereon.
(3) The denomination of weight shall , except where the small size of it renders it impracticable, be clearly and conspicuously stamped on an upper surface of the weight.
(4) The capacity of the measure shall, unless otherwise prescribed, be clearly and conspicuously stamped on the outside of the measure or on a metal plate permanently secured thereto.
(5) When an instrument is marked with its capacity or denomination, as the case may be, the denomination of the instrument shall be started in full, or in respect of a denomination specified in the Second Schedule, in the abbreviated form specified opposite thereto in Table 11 of the second column of the second schedule.
(1) The graduations on an instrument of measure shall be–
(a) indelible, clear, distinct and legible;
(b) except in respect of a graduated glass measure, be uniformly spaced; and
(c) in the case of denominated main graduation, be distinguished by longer lines than the intermediate graduations.
(2) The graduation on the steelyard shall–
(a) consist of notches or incised or embossed lines so defined that the position of the poise with respect thereto is clearly indicated; or
(b) be cut, incised, or embossed in one plane, at right angles to the steelyard and parallel to each other.
(3) A self indicating weighing machine shall have scale intervals not greater than the limit of error on initial verification stated in Tables 3, 5, and 6 in the First Schedule:
No person shall supply any new or repaired weighing or measuring instrument unless it has been assized:
Provided that any instrument which cannot be assized for any reason, shall be clearly marked “LEGAL FOR USE IN TRADE”.
(1) A weighing instrument shall be in balance–
(a) when unloaded; and
(b) where a loose receptable or frame is used in conjunction with such instrument, when the receptable or frame is attached thereto.
(2) Balance shall be indicated–
(a) in the case of vibrating weighing instrument, by the beam of steelyard returning to the position of equilibrium when disturbed therefrom;
(b) in the case of self-indicating weighing instrument or a weighing instrument provided with a graduated indicating scale or difference chart, by the pointer coming to rest at the position of equilibrium or zero graduation with the bubble of any spirit level in its true position;
(c) in the case of a counter machine constructed on the beranger principal, by two pointers, each attached to a subsidiary beam, coming to rest directly opposite each other; or
(d) in the case of an accelerating dead weight machine, by the beam, on being released from the stop under the weights pan, falling gently to the stop under the goods pan.
(3) Balance shall not be affected when the load is removed from the instrument.
(4) Where a weighing instrument is provided with a balance box, balance screw or gravity ball, such device shall be capable of adjustment only by use of a mechanical appliance.
(1) An assizer shall refuse to assize an instrument which–
(a) is not properly constructed or when, in the opinion of the assizer, its material or mode of construction appear likely to render it unsuitable for sue in trade;
(b) has unusual or novel features, unless it is of a design or pattern in respect of which a certificate has been issued in terms of section 15 of the Act;
(c) Is not sufficiently strong to withstand the wear and tear of ordinary use in trade;
(d) Is not in a clean state;
(e) Is not complete in itself;
(f) Bears a manufacturers or other mark which might be mistaken for the stamp of assize;
(g) Is of platform or inconvenient size to support the load being weighed on the platform machine or weighbridge; or
(h) Is so constructed and sited that the weighing of goods and the indicated weight are not simultaneously clearly visible to the purchaser.
(2) An assizer shall refuse to assize an instrument which–
(a) has interchangeable or reversible parts, unless the interchange or reversal does not affect the accuracy of the instrument;
(b) has removable parts, the removal of which would affect the accuracy of the instrument, unless the part are such that the instrument cannot be used without them;
(c) has scoop, pan, plate, or other part which is essential to its operation, broken;
(d) has a scoop, pan, or plate or plate such size or shape as may lead to incorrect weighing either through its fouling the housing the scale, or because proper contact between the knife edge and bearing is disturbed;
(e) has a good plate which is readily absorbent on account of faulty glazing or account of the extent to which it is cracked or chipped;
(f) has a friction plate, stay, hook or loop which is not of hardened steel or of an approved material; or
(g) has packing at the knife edges which, in the opinion of the assizer, is either excessive as to the number of pieces or is in other aspects unsuitable for the purpose.
(3) An assizer shall refuse to assize and accelerating weighing instrument, other than an accelerating dead weight machine.
(4) An assizer shall refuse to assize–
(a) a petrol pump driven by means of an electric motor unless the supply of electricity to such motor is controlled by switches, fuses or cut-over devices, isolated form the pump and locked securely to prevent unauthorised use or interference; or
(b) a bulk-flowmeter fitted with gravity and power delivery systems if the change-over valve leaks any quantity in excess of 0.5 litres when set in any position.
(5) An assizer shall refuse to assize any instrument alleged to conform to an international specification until such specification is approved by the Superintendent Assizer.
An assizer may refuse to assize a weighing instrument which does not have following descriptive marking–
(a) Manufactureres' mark or name written in full;
(b) Indication of accuracy in the form of a Roman number;
(c) Maximum capacity indication;
(d) Minimum capacity indication;
(e) Verification scale interval “E”;
(f) Name or make of manufacturers agent for an imported instrument;
(g) Identification mark on each unit of the instrument consisting of separate but associated units;
(h) Pattern approval number;
(i) Special temperature limits;
( j) Maximum additive tare effect;
(k) Maximum subtractive tare effect; or
(l) Maximum safe load.
CLASSIFICATION OF WEIGHING INSTRUMENTS
(1) Subject to the provisions of this regulation, weighing instruments of the non-automatic type shall be identified with the verification scale intervals for different type of instruments set out in Table 1 and 2 of the First Schedule and the following accuracy classes–
(a) Special accuracy I;
(b) High accuracy II;
(c) Medium accuracy III; and
(d) Ordinary accuracy III.
(2) Different types of instrument will be as shown in Table 1 in the First Schedule.
The maximum permissible errors–
(a) for semi-self-indicating weighing instruments including price computing and printing electronic weighing instruments shall be shown in Table 3 and limits of error on trade weights shall be as shown in Table 4; and
(b) for non-self indicating weighting instruments shall be shown in table 5 and 6 of the First Schedule.
(1) Electronic weighing instruments shall comply with and operate according to the following conditions.
(a) design and construction of the instruments, shall preserve their metrological qualities when properly used and stalled and when used in an environment for which the intended;
(b) when exposed to disturbances, electronic instruments shall not display the effects of significant faults or shall automatically detect and indicate them;
(c) upon automatic detection of a significant fault, electronic instruments shall provide a visual or audible alarm that shall continue until the user takes corrective action fault disappears;
(d) the requirements of (a) and (b) shall be met on a lasting basis during a period of time that is normal in view of the intended use of such instruments;
(e) digital electronic devices shall always exercise adequate control of correct operation of the measuring process, the indicating facility and all date storage and data transfer;
(f) the instruments shall have no characteristics likely to facilitate fraudulent use, and possibilities for unintentional misuse shall be minimal as components that may not be mantled or adjusted by the user shall be secured against such actions; and
(g) instruments shall be designed to permit ready execution of the statutory controls laid down in this regulation .
(2) The error of indicating shall not exceed the maximum permissible error of indication shown in Table 3 of the First Schedule and in case of digital indication, the error shall be corrected for the rounding error.
(3) The maximum permissible errors shall apply f\to the net and tare values for the possible loads, excluding present tare values.
An assizer shall ensure that–
(a) the pattern of an instruments is permissible for verification;
(b) the pattern of instrument conforms to the requirement of international recommendations in relation to technical rules and pattern approval; and
(c) the prescribed inscriptions, markings and places for stamping are present.
(1) when the instrument has been levelled to its reference position, the following test procedures shall be performed–
(a) a weighing test shall be carried out by applying test loads from zero up to and including maximum capacity and in the same way, reduce the test load back to zero:
Provided that at least 5 load steps shall be selected for the weighing tests and an instrument will pass the test when its measure deviation or error is within the maximum permissible error;
(b) except as otherwise provided, calculation of measure deviation shall be done as follows:
Measured weight value= P
Additional load = AL
Indicated Value = I
Therefore, P = I + 0.5e – Al
Where Measure deviation = E
And Load = L
E=P-L = I + 0.5 – Al – L; and
(c) Once the test has been completed, the measure deviation shall be positive when the instrument indicates too much and in addition to this test, a deviation curve shall be required to be plotted.
(2) In performing the discrimination test–
(a) with regard to a non-self indicating instrument, and extra load equivalent to 0.4 times the absolute value of the maximum permissible error shown in Table 5 or 6 of the First Schedule when gently placed on or removed from the instrument at equilibrium shall produce a visible movement of the indicating element;
(b) with regard to self and semi-self indicating weighing instruments dependent on an analogue indication, an extra equivalent to the absolute value of the maximum permissible error shown in Table 3 of the First Schedule for the applied load when gently placed on or removed from the instrument at equilibrium shall cause a permanent displacement of the indicating element corresponding to not less than 0.7 times the extra load;
(c) with regard to digital indication, an additional load equal to 1.4 times the scale interval, when gently placed on or removed from the instrument at equilibrium, shall change the initial indication; and
(d) a discrimination test shall be performed at loads equal to minimum ½ maximum and maximum capacities.
(3) A non-self-indicating weighing instrument shall have a sensitivity such that an additional load equivalent to the absolute value of the maximum permissive error shown in Table 5 or 6 of the First Schedule for the applied load when placed on the instrument at equilibrium shall cause a permanent displacement of the indicating element of at least 2mm for an instrument with maximum of less than 30kg and 5mm for an instrument with maximum greater than 30kg.
(4) In the case of an instrument with a damping device, the additional load shall be applied to eliminate the effect of the discretion threshold.
(5) The repeatability test shall be the difference between the results of several weightings of the same load which shall not be greater than the absolute value of the maximum permissible error of the instrument at the load and tests being performed at 50% and 100% maximum loads.
(6) The interchangeability test shall be complete when balanced equal armed weighing instrument, the load and working standards are interchanged on the load receptacle and the indicated weight shall not change by more than twice the absolute value of the limit of error specified.
(7) To perform the eccentric test:
(a) the receptacle shall be loaded with a load corresponding to 1 /3 of the sum of the maximum capacity and corresponding maximum tare effect;
(b) in the case of the instruments with a load receptacle having not more than four points of support (n<<4), the four quarter segments roughly equal to ¼ of the surface of the load receptor shall be loaded in turn; and
(c) in both cases the indications for different positions of the load shall remain within the maximum permissible error for the applied load in Table 3, 5 and 6 of the First Schedule.
(8) To test for locking device, it should be impossible to obtain a weighing result on the indicating element once locked.
(9) To test for accuracy of zero setting–
(a) in case of a non automatic, semi-automatic and initial zero setting devices this shall be done by setting the instrument to zero and then determining the additional load of small weights in steps of 1 at which the indication changes 10e from zero to one scale interval, and the deviation at zero shall be calculated as follows-
P = I + 0.5c – Al
Where measure weight value
The E = P – L = I + 0.5c – AL – L; and
Where E = Measure deviation.
L = Load; and
(b) in case of automatic zero setting device and zero tracking devices, the indication shall be brought out of the automatic range by loading with 1/10c and adding small weights in steps of 1/10c and attain change from one scale interval 1/10c to another, then the deviation shall be calculated according to sub-regulation (9) (a).
Counter poise weights
(1) Where lead is used for adjusting purposes on any poise, it shall not come into contract with the beam or steelyard.
(2) A poise shall be provided with an adjusting hole of such size, shape and design, as to permit easy adjustment.
(3) A poise shall be so constructed that no part thereof can be detached without the use of a mechanical appliance.
(1) A counterpoise weight shall be–
(a) marked in equivalents of 5kg, 10kg, 20kg, 25kg, 50kg or 100kg;
(b) made of brass, nickel-steel, or other corrosion resisting metal if used for hides and skins;
(c) have only one undercut adjusting hole containing fixed lead sufficient to cover adequately the bottom of such hole , and with room to permit future adjustments; or
(d) made of brass if its actual weight is 100 grams or less.
(2) Subject to the provisions of such sub-regulation (3) where more than one platform machine provided with counterpoise weights is kept or used by any person on any premises or on a public market, each such counterpoise weight shall be identified with the weighting instrument to which it belongs by a number conspicuously and indelibly marked and corresponding to a number similarly marked on the pillar and on the counter balance of the instrument.
(3) The provision of such-regulation (2) shall not apply to any counterpoise weight adjusted to a ratio of 50: 1 or 100: 1 precisely.
(4) A counterpoise weight of metric denomination shall be distinctly different from any other counterpoise weights in shape or in colour.
(1) Knife edges shall–
(a) be firmly secured in position;
(b) be properly aligned; and
(c) bear throughout the entire length of the parts designed to be in contract.
(2) Knife edges and bearing shall be a hardened steel, a gate or an approved material and the load carrying parts shall not show scratches when tested by means of the application of a superfine smooth file.
(1) An automatic weighing instrument shall be–
(a) of a pattern brought into use after the thirtieth day of October, 1964 and certified by the Superintendent Assizer under section 15 of the Act;
(b) securely fixed in position in which it will operate;
(c) tested institute with the produce it is intended to weight;
(d) fitted with seals to protect all adjusting devices or have all such devices operable only with a special detachable key;
(e) marked with clear marks of identification on all parts that require to be dismantled for any purpose whatsoever but which marks give a clear indication of the parts which march on re-assemble;
(f) provided with suitable means of extracting from any hopper or conveyor such loads or sample deliveries as the assizer may require for the tests;
(g) tested by taking not less than 20 sample deliveries either at random or in sequence, which tests shall be repeated as many times and the assizer considers necessary; and
(h) marked with a stamp of assize upon a lead plug in a conspicuous place on the beam, main body or frame of the instrument.
(2) The limits of error allowed on an automatic weighing machine shall be 1 scale interval at a load below 2000 scale intervals and for load exceeding 2000 scale intervals, the limit of error at initial assizing shall be increased to 2 scale intervals.
(1) Except where otherwise provided in regulation 18 tests shall be carried out for all weighing instruments at the following loads:
(a) zero load;
(b) maximum load, including if possible maximum additive tare loads;
(c) half load; and
(d) loads at which the method of balancing is modified by addition or subtraction of a unit weight.
(2) Self-indicating weighing instruments shall in addition be tested at-
(a) capacity of self-indication if different from maximum load;
(b) loads at which the limit of error defined in (a) changes; or
(c) at as many loads as the assizer considers desirable in view of the particular construction.
(1) Beam scales shall be classified as follows–
(a) Accuracy class I comprising precision balance provided with means of relieving all the knife edges and bearings and shall include single pan optical projection balances and balances with weight loading devices;
(b) Accuracy class II composing cream test beams and beam scale other than class I beam scales used for testing chemicals, drugs, fine seeds or precious metals or stones; or
(c) Accuracy class III comprising beam scales other than class I or class II beam scales.
(2) A new or repaired class II or class III shall be stamped class II or class III as the case may be.
(3) Any device for adjusting the balance of a beam scale shall be permanent secured and so attached that it cannot readily be tampered with:
Provided that a class I or class II beam scale may be fitted with–
(a) threaded balancing screws at the extremities of the beam; and
(b) an approved balancing device.
(4) In a beam scale provided with a pointer moving across a graduated indicating plate or difference chart, the pointer shall travel beyond the extreme graduation on each side of the point of equilibrium or zero graduation:
Provided that if the chart is graduated on the heavy side only the pointer shall travel beyond the extreme graduation on that side and for a corresponding distance on the ungraduated side.
(5) A beam scale shall be tested–
(a) for discrimination;
(b) for sensitivity; or
(c) for eccentricity:
Provided that the error allowed shall be as specified in Table 3, 5 and 6 of the first Schedule.
(6) On a beam scale, the stamp of assize shall be stamped upon a lead plug inserted in the beam immediately under or over the fulcrum knife edge or as near therefore as it is practicable or, where the beam is totally enclosed in the housing, upon a lead securely fitted in a cup riveted to that housing.
(1) In a counter machine–
(a) the supports of the pans shall be of rigid structure; and
(b) the centre fork shall be so secured that it cannot twist or get out of place.
(2) A counter machine constructed on the beranger principle shall, if it is–
(a) a closed beranger, have–
(i) its working parts totally enclosed in a housing; and
(ii) pans which if inter changeable, do not affect the balance if interchanged;
(b) an open beranger, have–
(i) a capacity not exceeding 15kg;
(ii) a number stamped on any loose pan and on the frame or beam, which number shall commerce with the final two digits of the year in which it was manufacture;
(iii) the weights pan of integral construction or securely fixed to the its cross by means of two or more rivets;
(iv) the support for the goods-pan of welded or riveted construction and without holes in its upper surface;
(v) a frame of cast iron or mild steel, which stands level upon a level plate without rocking;
(vi) in the case of a steel frame, not less than three spreaders between the two sides to stiffen them; and
(vii) if it is provided with anchor links, such links as are irremovable without the use of a mechanical appliance, and hardened taper pins as guard pins or securing the links.
(3) Material for balancing purposes shall be contained in a balance box which is–
(a) securely fixed to the under surface of a fixed weights pan or of the support for the weights-pan; and
(b) capable of containing lead to a weight not exceeding one per cent of the capacity of the machine.
(4) On a counter machine, the travel of the beam each way from the horizontal position shall be, where the capacity of the machine is–
(a) not over 2kg, not less than 6mm;
(b) over 2kg and over 5kg, not less than 7mm;
(c) over 5kg and not over 10kg, not less than 8mm;
(d) over 10kg and not over 20kg, not less than 10mm; or
(e) over 20 kg, not less than 12mm.
(5) A counter machine shall be tested–
(a) for accentricity with a load equal to 1/3 of maximum capacity and any difference in indication due to this test shall not exceed the maximum permissible error specified in tables 3, 5 and 6 of the First Schedule;
(b) with a weight equal to 1/3 of maximum capacity of the machine placed on the goods pan anywhere within a distance from the centre equal to 1/3 the greatest length of the pan or, if the pan has a vertical side, against the middle of that side and a similar weight placed in any position on the weights pan, and the machine shall indicate the same weight within half the limit of error specified in Tables 3, 5 and 6 of the Third Schedule;
(c) at capacity, with the weights placed centrally on each pan, unless the goods pan is the form of a scoop in which case half the total weight shall be placed against the middle of the back of the scoop and the other half in any position on the scoop:
Provided that the sensitiveness and discrimination error shall be the maximum permissible errors specified in Tables 3, 5 and 6 of the First Schedule.
(6) The stamp of assize shall be stamped upon a lead plug inserted in a conspicuous and easily accessible part of the beam:
Provided that in the case of an enclosed beranger, it may be stamp upon the housing or upon a lead plug inserted therein.
(1) In a crane machine, the range of balance shall not exceed two per cent of the capacity of the machine.
(2) A crane machine shall be tested at the minimum and maximum points and at points where the maximum permissible error changes and also at all numbered scale intervals the assizer considers necessary.
(3) Subject to regulation 15 , the limit of error allowed and sensitiveness required in a crane machine of a capacity specified shall be as shown in Table 5 of the First Schedule.
(4) The stamp of assize shall be stamped upon a lead plug inserted in a conspicuous part of the steel yard or, where the machine has no steelyard on the housing.
(5) An assizer shall refuse to assize a crane machine not constructed on the lever principle unless it is a design or pattern in respect of which a certificate has been issued under section 15 of the Act.
(1) In a platform machine or weighbridge–
(a) the upper surface or edge of the steelyard shall be in a straight plane from the zero graduation to the nose end;
(b) there shall be no readily removable parts other than the counter balance to support the counter poise weights;
(c) adequate stops shall be provided to prevent any poise from travelling behind the zero graduation;
(d) provided with a load carrying rail shall be distant from any other rail not less than 10mm:
Provided that where the load carrying rail the rail shall be overlap or have a bridging piece, a gap of 5mm shall be maintained between the over lapping parts.
(2) A weighbridge shall have–
(a) provision for adequate drainage and the pit kept free from any accumulation of water, mud or debris;
(b) it approaches smooth, straight and level for a distance of not less than the length of the platform at each of the weighbridge;
(c) the building housing the chart or steelyard so constructed that the operator has a clear view and unobstructed that the operator has a clear view and unobstructed view of the entire platform or platforms;
(d) the platform so protected as to allow vehicles to pass on and off the platform at both ends;
(e) foundations of adequate strength to support, without change of position, both the mechanism and a load equal to the capacity of the weighbridge; and
(f) provisions for adequate re-enforcement in any concrete work to resist any point loading in any direction to the satisfaction of a competent civil engineer.
(3) Where a platform machine or weighbridge is not provided with a tare beam the weight of any loose receptacle or frame used in conjunction with the instrument shall be accurately compensated for by means of a counter poise weight distinction in shape from any of the ordinary counter poise weights belong to the instrument and such compensating weight shall have words “TARE WEIGH” legibly and conspicuously stamped on it edge.
(4) The range of balance–
(a) in a platform machine, shall not exceed one-half percent of the capacity of the machine and shall be not less than one –eight per cent of such capacity each way from the centre of travel of the ball; or
(b) in a weighbridge shall be double the range permitted in a platform machine.
(5) The travel of the steelyard each way from the horizontal position shall not be less than 10mm in both platform machine and weighbridge.
(6) A platform machine and a weighbridge shall be tested accuracy in accordance with regulation 18 and also perform additional tests as required for electronic scales.
(7) The maximum permissible errors allowed shall be as indicated in Table 3 as read with Tables 5 and 6 of the First Schedule and errors in service shall be twice those applied on initial verification.
(8) The stamp of assizer shall be stamped upon a lead plug inserted in a conspicuous and easily accessible position on the instrument and the official date stamp shall be stamped upon the lead plug in adjusting hole of any counter poise or tare weight.
(9) An assizer shall refuse to assize–
(a) an instrument of the type known as union scales; and
(b) a platform machine having counter poise weights which , when added to the full value of the steelyard reading, represents a weight greater or less than the capacity of the machine.
(1) In a self-indicating weighing instrument–
(a) in which weight indications are dependent on the extension of a spring, the spring shall be iso-elastic or a temperature compensating device shall be incorporated;
(b) other than a dormant platform machine or weighbridge, weighing instrument or self indicating weighing instrument specifically designed for use in an out of level position, a circular spirit level or cross spirit level shall be provided;
(c) error due to parallax shall not exceed the value of the smaller subdivision; and
(d) the indicating wire or the extremity of the indicating pointer shall not exceed in width or thickness the width of any graduation, and the extremity of the pointer shall meet but not obscure the graduations.
(2) The graduations on the chart shall–
(a) in the case of a platform or weighbridge–
(i) not exceed 0.8mm in width in a platform machine or weighbridge respectively; and
(ii) be not less than 3mm apart measured from the centre to centre, whether or not they are on opposite sides of a dividing line:
(b) in the case of a self-indicating weighing instrument other than a platform machine or weighbridge–
(i) not exceed 0.4mm in width;
(ii) be not less than 1.5mm apart, measured from centre to centre, whether or not they are on opposition sides of the dividing lines:
Provided that a lens or other device may be fitted to the instrument for the purpose of magnifying the graduations so as to bring them into conformity with the provisions of this sub-regulation.
(3) A self-indication weighing instrument shall be tested–
(a) to ensure that the graduations indicating value are in alignment with these indicating weight and sufficient number of computations shall be checked to establish their accuracy;
(b) at as many graduations as the assizer considers necessary, and the instrument shall be correct whether the test is forward or backward;
(c) to ensure that the instrument, if fitted with two charts indicating weight, shows the same indication or both;
(d) if it specifically designed for use in an out-of –level position the absolute value of the difference between the indication of the instrument in its reference position and the indication in the titled position shall not exceed–
(i) at no load, two verification scales intervals; and
(ii) at self-indicating, capacity maximum permissible error.
(4) Where a self-indicating ticket printing instrument is designed to print tickets or provided with digital read out, any indication at zero shall show either a true zero or if the balance is incorrectly set, then a false balance shall be indicated or printed as the case may be.
(5) All self-indicating ticket printing instrument shall have an efficient stop fraud device to prevent the printing operation being performed before the indicator has come to rest or to prevent the printing of a ticket showing a weight that does not correspond with the weight indicated.
(6) Subject to the provision of regulation 15–
(a) the maximum permissible error as specified in Table 3, 5 and 6 of the first schedule shall be applicable;
(b) the maximum permissible error on a self-indicating printing or digital read out shall not exceed plus or minus 1 scale interval of the instrument; and
(c) the stamp of assizer shall be stamped upon a lead plug inserted in a conspicuous and easily accessible part of the instrument.
(1) In a spring balance–
(a) The chart shall–
(i) be clearly and indelibly marked “TRADE SPRING BALANCE” or “FOR TRADE USE”;
(ii) bear a statement of the weight “e” value; and
(iii) be made of white enamel, polished brass, or an approved material s protected that the graduation and other markings are clearly visible;
(b) graduation on the chart shall not–
(i) exceed 0.8mm in width; and
(ii) be less than 3mm apart, measured from centre to centre, whether or not they are on opposite sides of a dividing line;
(c) where a temperature compensating device or iso-elastic spring is incorporated, it shall be capable of compensating temperature variations of
10 degrees Celsius in balance and at load;
(d) any ball-bearing unit shall be protected against dust and dirst;
(e) the extremity of the indicating pointer shall not–
(i) exceed in width or thickness the width of any graduation; and
(ii) be more than 2mm from the chart;
(f) a suitable balancing device of adjustment only by use of a mechanical appliance shall be provided; and
(g) be back balance with a bag, sack, pan or other means of loading, which fact shall be clearly stated on the chart.
(3) The range of balance shall not exceed one percent of the capacity of the spring balance.
(4) A spring balance shall be tested–
(a) for accuracy of weighing at as many graduations as possible in increasing and decreasing loads;
(b) For endurance at the equal to the capacity of the balances for a period not exceeding 24 hours and after expiration of a further four hours testing for accuracy.
(5) Subject to the provisions of regulation 15, the maximum permissible error shall be as specific in Table in Tables 3, 5 and 6 of the First Schedule as applicable.
(6) The stamp of assize shall be stamped upon a lead plug inserted in the chart, or in a prominent position on the instrument.
(1) In a steel yard or wall beam–
(a) the steelyard shall be made of wrought iron, steel or an approved metal and shall be perfectly straight;
(b) a stop to prevent excessive oscillation of the steelyard shall be proved;
(c) any load hook shall be securely attached to the instrument;
(d) end fittings to prevent the poise carrier riding off the steelyard shall be securely attached; and
(e) any poise shall move slowly without risk of injury to the notches and there shall be a stop to prevent it travelling behind the zero graduation.
(2) In a wall beam–
(a) the frame and bracket shall be of adequate strength to support, without deflection, both the wall beam and the load equal to the capacity of the wall beam;
(b) on a swivel bracket, the steelyard shall be level in all position; and
(c) the range of balance shall not exceed one half percent of the capacity of the wall beam.
(3) The travel of the steelyard of a wall beam each way from the horizontal shall be not less than 10mm.
(4) A wall beam or steelyard shall be tested at as many graduations as the assizer considers necessary, and the instrument shall be correct whether the test is forward or backward.
(5) Subject to the provisions of regulation 15 the maximum permissible error required shall at any load not exceed the limits or error specified in Tables 3, 5 and 6 the first schedule.
(6) The stamp of assize shall be stamped upon a lead plug inserted in a conspicuous and easily accessible part of the instrument and a date stamp shall be stamped upon the lead in the adjusting hole of the poise.
(7) An assizer shall refuse to assize–
(a) a counter steelyard;
(b) a steelyard of capacity of less than 50kg; or
(c) a steelyard with three hooks.
(1) A weight for general trade shall–
(a) be a denomination specified in Table 12 of the Third Schedule and have that denomination marked on its top surface;
(b) if it is a new iron weight, be galvanised, oxidised, painted or protected by an approved process or be made of brass or bronze;
(c) if made of iron, be denomination of 100g or greater;
(d) be hexagonal or cylindrical in shape, a rectangular block shape being acceptable for weights of 5kg and higher denomination;
(e) have no part which can be removed without breaking a ring handle or seal;
(f) be free from flaws except for the marking of denomination or other identification;
(g) if marked with the manufacturers identification, have that marking–
(i) without figures; and
(ii) with no letters larger than one-half of the size of the letter or figures marking the denomination.
(h) have not more than one adjusting hole which shall–
(i) be partly filled with lead and permitting future adjustment;
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