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Union of India - Section

Section 10k in The Standards of Weights and Measures (General) Rules, 1987

10k.

,2x10k,5x10kk being a positive or negative whole number or equal to zero.(ii)The verification scale interval for different types of instruments shall be as given in Table 39.TABLE 39
Type of instrument Verification scale interval
Graduated, without auxiliary indicating device Graduated, with auxiliary indicating deviceNon-graduated E=de is chosen by the manufacturer according to requirement in sub-paragraph (3) and clause (iii) of sub-paragraph(5) of this paragraph.e is chosen by the manufacture according to sub-paragraph (3) of this paragraph
(3)Classification of instruments
(i)The verification scale interval, number of verification scale intervals and the minimum capacity, in relation to the accuracy class of an instrument, shall be as given in Table 40.
TABLE 40
Accuracy class Verification scale intervale Number of verification scale intervals n=Max/e   Minimum capacity
    Minimum Maximum  
Special I 0.001 g≤e 50 000* - 100e
High II 0.001 g≤e≤0.05 g 100 100000 20e
  0.1 g≤e 5000 100000 50e
Medium III 0.1 g≤e≤2 g 100 10000 20e
  5 g≤e 500 10000 20e
Ordinary III 5 g≤e 100 1000 10e
Note.-For values of "e" less than 1 mg in respect of class I accuracy instruments, e shall be taken to be equal to 1 mg for the purpose of verification/inspection.*See for exception in clause (v) of sub-paragraph (5) of this paragraph.
(ii)On multiple range instruments, if the verification scale intervals are el, e2.......er with e,< e2 < .....<er, Min, n and Max shall be indexed accordingly.
(iii)On multiple range instruments each range shall be treated as an instrument with one range.
(iv)For special application that are clearly marked on the instrument, an instrument may have weighing ranges in classes I and II or in classes II and III. The instrument as a whole shall then comply with the more severe requirements of sub-paragraph (9) of this paragraph applicable to either of the two classes.
(4)Additional requirements for a multi-interval instrument
(i)Partial weighing range:
Each partial range (index i =1, 2...) shall be defined by:its verification scale intervals ei wherei + 1 > eiits maximum capacity Max.its minimum capacity mini = Maxi+1 (for i = 1 the minimum capacity is Mini =Min)The number of verification scale intervals n for each partial range is equal to ni= Maxi / ei
(ii)Accuracy class
ei and ni in each partial weighing range, and min shall comply with the requirements given in Table 40 according to the accuracy class of the instrument.
(iii)Maximum capacity of partial weighing ranges
With the exception of the last partial weighing range, the requirements in Table 41 shall be complied with, according to the accuracy class of the instrument.TABLE 41
Class I II III IV
Maxi/ei+1 ≤50000 ≤5000 ≤500 ≤50
(iv)Instrument with a tare device:
Requirements concerning the ranges of a multi-interval instrument apply to the net load, for every possible value of the tare.
(5)Auxiliary indicating devices
(i)Type and application
Only instruments of classes I and II may be fitted with an auxiliary indicating device, which shall be,a device with a rider, ora device for interpolation of reading, ora complementary indicating device (*) oran indicating device with a differentiated scale division (**).These devices shall be permitted only to the right of the decimal sign.
(ii)A multi-interval instrument shall not be fitted with an auxiliary indicating device.
(iii)Verification scale interval
The verification scale interval e shall be determined by the expressionD<e≤10d(***)such that e = 1x 10k kgk being a positive or negative whole number, or zero. This condition shall not apply to an instrument of class I with d < 1 mg. In that case e shall uniformly be 1 mg.(***) The value of e, calculated following this rule, are, for example,-TABLE 42
d = 0.1g 0.2 g 0.5 g
e= 1g 1g 1g
(a)Example of a complementary indicating device
(iv)Minimum capacity
The minimum capacity of the instrument is determined in conformity with the requirements in Table 40.
(v)Minimum number of verification scale intervals
for an instrument of class I with d < 0.1 mg, n may be less than 50000.
(6)Maximum permissible errors
(i)Values of maximum permissible errors on verification/re-verification The maximum permissible errors allowed for increasing or decreasing loads shall be as given Table 43.
TABLE 43m
Maximum permissible errors on verification/re-verification For loads m expressed in verification scale intervalse      
  Class I Class II Class III Class III
±0.5e Min≤m≤50000 Min≤m≤5000 Min≤m≤500 Min≤m≤50
±1e 50000<m≤200000 5000<m≤20000 500<m≤2000 50<m≤200
±1.5e 200000<m 20000<m≤100000 2000<m≤10000 200<m≤1000
(ii)Values of maximum permissible errors in inspection
The maximum permissible errors during inspection shall be twice the maximum permissible errors allowed on verification.
(iii)Basic rules concerning the determination of errors
(a)Influence factors
Errors shall be determined under normal test condition. When the effect of one factor is being evaluated, all other factors are to be kept relatively constant, at a value close to normal.
(b)Maximum permissible errors for net values
The maximum permissible errors apply to the net value of the load for every possible tare load, except preset tare values
(c)Tare weighing device
The maximum permissible error for a tare weighing; device are the same, for any tare value as those of the instrument, for the same value of load.
(7)Permissible difference between resultsRegardless of what variation of results is permitted, the error of any single weighing result shall by itself not exceed the maximum permissible error for the given load.
(i)Repeatability
The difference between the maximum and minimum results of several weighings of the same load shall not be greater than the absolute value of the maximum permissible error for the given load.
(ii)Eccentric loading
The indications for different positions of a load shall meet the maximum permissible errors, when the instrument is tested according to sub-paragraphs (a) to (d) of this paragraph.
(a)Unless otherwise specified hereafter, a load corresponding to 1/3 of the sum of the maximum capacity and the corresponding maximum additive tare effect shall be applied.
(b)On an instrument with a load receptor having n points of support, with 11>4, the fraction 1/(n-1) of the sum of the maximum capacity and the maximum additive tare effect shall be applied to each point of support.
(c)On an instrument with a load receptor subject to minimal off-centre loading (e.g., tank, hopper) a test load corresponding to one-tenth of the sum of the maximum capacity and the maximum additive tare effect shall be applied to each point or support.
(d)On an instrument used for weighing rolling loads (e.g., vehicle scale, rail suspension instrument) a rolling test load corresponding to the usual rolling load, the heaviest and the most concentrated one which may be weighed, but not exceeding 0.8 times the sum of the maximum capacity and the maximum additive tare effect, shall be applied at different points on the load receptor.
(iii)Multiple indicating devices
For a given load the difference between the indications of multiple indicating devices including tare weighing device, shall be not greater than the absolute value of the maximum permissible error, but shall be zero between digital indicating or printingdevices.
(iv)Different positions of equilibrium
The difference between two results obtained for the same load when the method of balancing the load is changed (in the case of an instrument fitted with a device for extending the self-indication capacity) in two consecutive tests, shall not exceed the absolute value of the maximum permissible error for the applied load.
(8)Discrimination
(i)Non-self indicating instrument
An extra load equivalent to the value of the maximum permissible error for the applied load when gently placed or withdrawn from the instrument at equilibrium shall produce movement as required under sub-paragraph (1) of paragraph 6.
(ii)Self or semi-self indicating instrument
(a)Analogue indication
An extra load equivalent to the maximum permissible error for applied load when placed gently on or withdrawn 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.
(b)Digital indication
An additional load equal to 1.4 times the actual scale interval, when gently placed on or withdrawn from the instrument at equilibrium shall change the initial indication.
(9)Variation due to influence quantities and timeAn instrument shall comply, unless otherwise specified, with sub-paragraphs (6), (7) and (8) of this paragraph under the conditions of (ii) and (iii) of sub-paragraph (9) of this paragraph and additionally it shall comply with clauses (i) and (iv) of sub-paragraph (9) of this paragraph.
(i)Tilting
(a)For instrument of class II, III or IV liable to be tilted, the influence of tilting shall be determined under the effect of a lengthwise or transverse tilting equal to 2/1000 or corresponding to the limiting value of tilting marked on, or indicated by a level indicator, whichever is the greater tilt.
The absolute value of the difference between the indication of the instrument in its reference position (not tilted) and the indication in the tilted position shall not exceed:-at no load, two verification scale intervals, (the instrument having first been adjusted to zero at no load in its reference position) except instruments of class II.-at self indication capacity and at maximum capacity, the maximum permissible error (the instrument having been adjusted to zero at no load both in the reference and in the tilted position).An instrument shall be fitted with a leveling device and a level indicator fixed firmly on the instrument in a place clearly visible to the user, unless the instrument is:-freely suspended, or-installed in a fixed position, or-complying with the requirements on tilting when tilted to 5% in any direction.The limiting value of the level indicator shall be obvious, so that tilting is easily noticed.Note.-Limiting value of tilting: Displacement of 2 mm from a central position.
(b)On a class I instrument, the limiting value of tilting shall correspond to a tilt of no more than 2/1000 otherwise the instrument shall meet the requirements for instruments of class II.
(ii)Temperature
(a)Prescribed temperature limits
If no particular working temperature is stated in the descriptive markings of an instrument, this instrument shall maintain its metrological properties within the following temperature limits:-10°C, + 40°C
(b)Special temperature limits
An instrument for which particular limits of working temperature are stated in the descriptive markings shall comply with the metrological requirements within those limits.The limits may be chosen according to the application of the instrument.The ranges within those limits shall be at least equal to:-5°C for instruments of class (I)-15°C for instruments of class (II)-30°C for instruments of class (III) and (IIII)
(c)Temperature effect on no-load indication
The indication at zero or near zero shall not vary by more than one verification scale interval for a difference in ambient temperature of 1°C for instruments of class (I) and 5°C for other classes.For multi-interval instruments and for multiple range instruments this applies to the smallest verification scale interval of the instrument.
(iii)Mains power supply
An instrument operated from a mains power supply shall comply with the metrological requirements if the power supply varies:-in voltage from:-15% to + 10% of the value marked on the instrument,-in frequency: from-2% to +.2% of the value marked on the instrument, if alternate current is used.
(iv)Time
Under reasonably constant environmental conditions, an instrument of class I, II or III shall meet the following requirements:
(a)When any load is kept on the instrument, the difference between the indication obtained immediately after placing a load and the indication observed during the following 30 minutes, shall not exceed 0.5 e. However, the difference between the indication obtained at 15 minutes and after that at 30 minutes shall not exceed 0.2 e.
If these conditions are not met, the difference between the indication obtained immediately after placing a load on the instrument and the indication observed during the following four hours shall not exceed the absolute value of the maximum permissible error at the load applied.
(b)The deviation on returning to zero as soon as the indication has stabilised, after the removal of any load which has remained on the instrument for one half hour, shall not exceed 0.5 e.
For a multi-interval instrument, the deviation shall not exceed 0.5 e,On a multiple range instrument, the deviation on returning to zero from Max. shall not exceed 0.5 e,. Furthermore, after returning to zero from any load greater than Max, and immediately after switching to the lowest weighing range, the indication near zero shall not vary by more than el during the following 5 minutes.
(c)The durability error due to wear and tear shall not be greater than the value of the maximum permissible error.
Adherence to this requirement is assumed if the instrument has passed the endurance test specified in paragraph 9, which shall be performed only for instrument with Max≤100 kg.
(10)Pattern evaluation testsUpon pattern evaluation, the tests given in paragraph 9 and Annexure A shall be performed, to verify adherence to the requirement in sub-paragraphs (6), (7), (8) and clauses (i) to (iv) of sub-paragraph (9) of this paragraph, sub-paragraphs (5) and (6) of paragraph 4, sub-paragraph (3) of paragraph 5 and sub-paragraph (1) of paragraph 6. The endurance test shall be performed after all other tests in paragraph 9 and Annexure A.