Rule - 1. Title and commencement.
KARNATAKA WEIGHTS AND MEASURES
(ENFORCEMENT) (AMENDMENT) RULES, 1979
PREAMBLE
Whereas
a draft of the rules further to amend the Karnataka Weights and Measures
(Enforcement) Rules, 1959 was published as required by sub-section (4) of
Section 42 of the Karnataka Weights and Measures (Enforcement) Act, 1958
(Karnataka Act 2 of 1959) in Notification No. GSR 50 (RDC 124 CWM 75) dated
16th January, 1979 in the Karnataka Gazette dated 25th January, 1979 inviting
objections and suggestions from all persons likely to be affected hereby on or
before 15th March, 1979.
And
whereas, the said gazette was made available to the public on 25th January,
1979;
And
whereas, no objections or suggestions have been received on the said draft;
Now
therefore, in exercise of the powers conferred by Section 42 of the Karnataka
Weights and Measures (Enforcement) Act, 1958 (Karnataka Act 2 of 1959), the
Government of Karnataka hereby, makes the following rules, namely:
Rule - 1. Title and commencement.
(1)
These rules may be called the Karnataka
Weights and Measures (Enforcement) (Amendment) Rules, 1979.
(2)
They shall come into force at once.
Rule - 2. Amendment of Schedule VI.
In
Schedule VI of the Karnataka Weights and Measures (Enforcement) Rules, 1959:
(1)
for part II, the following parts shall
be substituted, namely:
"PART II
BEAM SCALES
(1)
Definition.
(a)
Beam scale:
A
weighing instrument with equal arms having three knife edges, three bearings,
an indicator (Pointer) in the Centre, and pans suspended from the end
knife-edges (see fig. 1);
(b)
Sensitiveness of a Beam Scale:
A
measure of its responsiveness to a small change in load in one of the pans,
under specified conditions of loading; this can be expressed as the ratio
between the change in mass in one of the pans and the corresponding deflection
of the beam (or of the attached pointer) caused by the change.
(i)
In the case of the beam scale fitted
with a pointer and an indicating scale, it is expressed in terms of milligrams
per division.
(ii)
In the case of a beam scale having no
indicating scale, it is expressed as the least weight, required to be added to
or removed from one of the pans; which causes an appreciable movement of the
pointer from its position of equilibrium under specified condition of loading.
(c)
Error (due to Inequality of Arms) :
The
error due to inequality of arms of a beam scale is equal to the mass of the
additional Weights required to bring to equipoise the balance, carrying weights
of equal masses in the pans,
(d)
Greatest Error (Due to Inequality of
Arms):
The
greatest error due to inequality of arms is the error determined with two
weights each equal to the capacity (full load) of the balance.
(2)
Classes And Capacities.
(a)
Beam Scales shall be of any one of the
four classes namely A, B, C or D, based on limits for sensitiveness and greatest
error specified in tables 16 to 19 respectively.
(b)
Beam Scales of the different classes
shall be of one of the capacities mentioned in tables 16 to 19.
(c)
The trade fox which the different
classes of scales may be used are:
|
Class of scale |
Use |
|
A |
Commercial assay and in 'Dharam Kantha' for verifying the weights of
bullion, and precious stones.. |
|
B |
Precious stones, jewels, pearls, bullion, Precious metals, saffron and
similar expensive commodities, chemists and druggists, preparations,
perfumery, etc. |
|
C |
Base metals and commodities such as cereals tea, Coffee, tobacco, jute,
cotton, dry fruits, spices, oil seeds, etc. |
|
D |
Weighment of cheaper commodities such as scrap iron, fuel/wood,
charcoal, Vegetables etc. |
(3)
Materials.
(a)
Material for class A Beam Scales.
Class
A beam scales shall be made of non-magnetic materials only except knife-edges
and bearings.
(b)
Materials for other classes of Beam
Scales; Beam and pans shall be made of stainless steel, mild steel, brass or
bronze.
Aluminium
alloy may be used in the smaller denomination, balances, having a capacity of
not more than 50 g. The pans of Class 'B' beam scales may be made of glass
also. In the case of beam scales of classes C and D pans of hard wood shall be
permitted for capacities 100 kg. and above. The pans of beam scales, when made
of timber shall be adequately reinforced and protected against wear.
(c)
Suspension.
Fans
shall be suspended from the beam by metal chains or metal stirrups, except
those of 100 g. and smaller capacity of Class B beam scales which may be
suspended by silk or nylon threads.
(d)
All mild steel parts used in beam
scales shall be suitably protected against rust.
(4)
Construction.
(a)
Knife-edges and bearings.
(i)
The knife-edges and bearings used in
beam scales shall be one of the following types:
(a)
'Agate-box' where in agate bearings
are fitted in a brass or iron box with side holes which permit the projecting
ends of the knife edges to pass into the boxes and rest on or rise to their
bearings, (see fig. 2)
(b)
'Dutchend'.
Wherein
the end bearings are fixed inside plates bolted together across the beam to
form a shackle (see fig. 3)
(c)
'Swan-neck'.
Wherein
the ends are curved and slotted the bottom of the slot forming a knife-edge the
extremities of the beam being widened in a direction at right angles to its
length so that the base of the slot is parallel to the central knife-edge (see
fig. 4)
(d)
'Continuous knife-edge.
Wherein
the knife-edges bear along their whole length (see fig. 5).
(ii)
Class.
A
beam scales shall have continuous knife-edges and shall he provided with means
for relieving all the knife-edges from the bearings.
(b)
Glass case.
Every
beam scale of Class-A shall be provided with a glass case. It shall also be
provided with bubble or a plumb line and levelling screws to facilitate
levelling of the instrument.
(c)
Leading Dimension.
(i)
No dimensions have been specified for
class A beam scales.
(ii)
Beam scales of classes B, C and D
shall have the leading dimensions specified in table 5 to 9 and fig. 6 to 10 as
applicable to within the tolerances specified in 4(d). For Class-C beam scales
of capacities 5 kg. and below fixed hooks may also be provided.
Note.
Class-D beam scale shall be distinguished from Class-C scale by the existence
of two identical holes, 5 to 10 mm. in diameter through the beam, one either
side of the central knife-edge (see also fig. 10).
(d)
Permissible variation in dimensions.
The
dimensions of the beam scales shall not vary by more than 10 per cent of the
dimensions prescribed in tables 5 to 9.
(e)
Attachment for adjusting the balance
of a beam scale:
(i)
Beam scales of Class B having a
capacity of 5 kg. and above shall be provided with a balance ball or balance
box securely attached to one of the suspension chain or pans in such a manner
that it is not possible to alter it easily. The balance ball or balance box
shall not be so large as to contain more loose materials than an amount
exceeding half a kilogram for beam scales of capacity 50 kg. and above.
(ii)
Beam scales of Classes C and D having
a capacity of 100 Kg. and above shall be provided with a balance ball or
balance box securely attached to one of the suspension chains or pans in such a
manner that it is not possible to alter it easily. The balance ball or balance
box shall not be so large as to contain more loose materials than an amount
exceeding one per cent in weight of the capacity of beam scales under 100 Kg.
if provided, or an amount exceeding 1 Kg. for beam scales of capacity 100 Kg.
and above.
(f)
Arrangement for adjusting
sensitiveness.
Beam
Scales of the than those of class-A shall not be provided with an attachment to
adjust their sensitiveness.
(5)
Tests.
(a)
Sensitiveness.
Class
A beam scales shall be tested for sensitiveness at zero and full loads and
shall comply with the requirements specified in Table I. Beam scales other than
Class-A shall be tested for sensitiveness at full load only and shall comply
with the requirements specified in Tables 17 to 19.
(i)
Class-A beam scale.
For
determining the sensitiveness of a class-A beam scale at no load, the beam
scale shall be properly balanced" without any load in the pans: A small
weight whose mass is accurately known shall be put on one of the pans. This
small weight shall be so chosen that the turning points of the pointers remain
within the reading index. The rest point shall be determined by the usual
oscillation method. The weight shall then be transferred to the other pan and
the second rest point shall be determined. The shift of the rest point is a
measure of sensitiveness. If this shift is 'w' mg. the sensitiveness 'S' in
milligrams per division at no load, is given by the relation:
S=2w/n
Similar
test, with appropriate weights in each pan representing the full capacity of
the beam scale shall be performed- to determine the sensitiveness of the beam
scale at full load.
(ii)
Class.
A
beam scale 2 g. to 20. As it is not practicable to make weights of
denominations very much of smaller than one milligram the sensitiveness of beam
scales of smaller capacities, i.e., from 2g to 20g, shall be determined by
means of a pair of weights, each weight having a mass of approximately 5 mg.
The difference in the masses of the two weights in the pair shall be adjusted
to be of the order of 0.05 mg, 0.12 mg, 0.25 mg. or 0.50 mg depending on the
beam scale under test, that is for testing 2g, 5g, 10g or 20g the beam scale,
respectively. This difference should be known accurately. After balancing the
beam scale at zero load, one or the two weights in the pair shall be put on the
right pan and the other weight on the left pan. The rest point shall "be
determined. The two weights shall then be interchanged and the second rest
point shall be similarly determined. If the rest point shifts by "rr"
divisions and if the difference between the masses of the two test weights is
'w' mg., the sensitiveness 'S' of the beam scale in milligrams per division at
zero load is given by the relation:
S=2w/n
To
determine the sensitiveness of the beam scale at full load a similar test shall
be performed with weights equal to the maximum capacity of the beam scale in
each pan.
(iii)
Beam scales of classes other than A
with pointer above beam pans of a beam scale other than Class A shall be loaded
with weights representing its full capacity and the scale balanced. Weights of
such mass shall then be added on one of the pans as may move the tip of the
pointer from its equilibrium position by an appreciable distance. After
removing 'these weights the same test shall be repeated on the other pan and
the weights required for moving the tip of the pointer by the same distance on
the other side of the equilibrium position shall then be added. If these
weights are denoted by 'w1' and 'w2' respectively, the sensitiveness 'S' of the
beam scale is given by the relation:
S=w1
+ w2/2
(b)
Inequality of Arms Test.
(i)
Class-A Beam Scale.
The
error due to inequality of arms of a Class-A Beam Scale shall be determined by
loading both the pans with weight made from the same material and representing
the full capacity of the scale. The scale shall then be properly balanced by
adding the small weights. After arresting the beam, the loads including the
small weights shall be interchanged and the scale balanced again by putting
additional weights on one of the pans. The additional weight, required to
balance the scale the second time, shall be equal to twice the error caused by
the inequality of the arms of the beam.
(ii)
Beam Scales other than Class-A.
In
the case of beam with fixed the beam with hooks but without chains and pans
shall be checked for balance. If detachable hooks are provided, the beam alone
shall be checked. The chain and pans shall then be attached in the case of both
the types of balance and checked again for balance.
After
checking at no load; each of the pans shall be loaded with weights equal to the
marked capacity of the scale and the scale shall be balanced.
The
loads thereon shall then be interchanged and the beam scale balanced again by
adding necessary weights on one of the pans. The additional weight shaft be
equal to twice the error due to inequality of arms of the beam.
In
the case of beams with attached hooks, the loads shall be interchanged along
with the chains and pans, and in the case of beams with detachable hooks the
loads shall be interchanged along with the hooks, chains and pans.
(iii)
The figures so obtained shall be
halved to determine the error at full load. These should lie within the limit
specified in tables 16 to 19.
(6)
Shift test
(i)
Class-A Beam Scales.
The
pans of the beam scale shall be loaded with weights representing half its
capacity and the scale properly balanced. Shifting the weight in one of pans
gently to different positions on the pan after arresting the beam and releasing
again shall not produce any appreciable difference in the balance of the beam
scale. Moving the weight on other pan in a similar manner shall also not
produce any appreciable difference in the balance of the beam.
(ii)
Beam Scale other than Class-A.
With
the pans loaded to half the capacity no appreciable difference in the accuracy
of the instruments shall result from moving the knife edges or bearings
laterally or backwards and forwards within their limits of movement.
Similarly,
when the above load is moved to any position on the pan, the difference shown
shall not be appreciable.
Note.
The words appreciable difference shall mean a difference which can be detected
but the Inspector should exercise his discretion in each particular case.
(7)
Sealing.
(a)
All weighing instruments shall be
provided by the manufacture with a plug/plugs or stud/studs of soft metal to
receive the stamp or seal of the verifying authority. Such plug/plugs or
stud/studs shall be provided in a conspicuous part of the instrument and shall
be made in such a manner as to prevent its removal without obtaining the
seal/seals.
TABLE 16
Limits for sensitiveness and greatest errors for
beam-scales
Class-A
|
|
Verification |
|
Inspection |
|
|
Capacity |
Sensitiveness per division of scale at no load and at full load |
Greatest error allowed when fully loaded |
Sensitiveness pet division of scale at no load and at full load |
Greatest error allowed when fully loaded |
|
(1) |
(2) |
(3) |
(4) |
(5) |
|
|
mg |
mg |
mg |
mg |
|
2 g |
0.02 |
0.04 |
0.06 |
0.08 |
|
5 g |
0.05 |
0.10 |
0.15 |
020 |
|
10 g |
0.10 |
0.20 |
0.30 |
0.40 |
|
20 g. |
0.20 |
0.40 |
0.60 |
0.80 |
|
50 g |
0.50 |
1 |
1.5 |
2 |
|
100 g |
1 |
2 |
3 |
4 |
|
200 g |
2 |
4. |
6 |
8 |
|
500 g |
5 |
10 |
15 |
20 |
|
1 kg |
10 |
20 |
30 |
40 |
|
2 kg |
20 |
40 |
60 |
80 |
|
5 kg |
30 |
60 |
90 |
120 |
|
10 kg |
50 |
100 |
150 |
200 |
|
20 kg |
100 |
200 |
300 |
400 |
|
50 kg |
200 |
400 |
600 |
800 |
TABLE 17
Limits for Sensitiveness and Greatest-Errors for Beam
scales
CLASS-B
|
|
Verification |
|
Inspection |
|
|
Capacity |
Sensitiveness at no load and full load |
Greatest error allowed when fully loaded |
Sensitiveness at no load when, fully loaded |
Greatest error allowed when fully loaded |
|
(1) |
(2) |
(3) |
(4) |
(5) |
|
2 g |
1 mg |
2 mg |
3 mg |
4 mg |
|
5 g |
2 mg |
4 mg |
6 mg |
8 mg |
|
10 g |
3 mg |
6 mg |
9 mg |
12 mg |
|
20 g |
5 mg |
10 mg |
15 mg |
20 mg |
|
50 g |
10 mg |
20 mg |
30 mg |
40 mg |
|
100 g |
20 mg |
40 mg |
60 mg |
80 mg |
|
200 g |
30 mg |
60 mg |
90 mg |
120 mg |
|
500 g |
50 mg |
100 mg |
150 mg |
200 mg |
|
1 kg |
100 mg |
200 mg |
300 mg |
400 mg |
|
2 kg |
200 mg |
400 mg |
600 mg |
800 mg |
|
5 kg |
300 mg |
600 mg |
900 mg |
1.2 g |
|
10 kg |
500 mg |
1 g |
1.5 g |
2 g |
|
20 kg |
1 g |
2 g |
3 g |
4 g |
|
50 kg |
2 g |
4 g |
6 g |
8 g |
|
100 kg |
5 g |
10 g |
15 g |
20 g |
|
200 kg |
10 g |
20 g |
30 g |
40 g |
TABLE 18
Limits of Sensitiveness and greatest errors for Beam scales
CLASS-C
|
|
Verification |
|
Inspection |
|
|
Capacity |
Sensitiveness at no load and at full load |
Greatest error allowed when fully loaded |
Sensitiveness at no load and at full load |
Greatest error allowed when fully loaded |
|
(1) |
(2) |
(3) |
(4) |
(5) |
|
100 g |
100 mg |
200 mg |
300 mg |
400 mg |
|
200 g |
200 mg |
400 mg |
600 mg |
800 mg |
|
500 g |
500 mg |
1 g |
1.5 g |
2 g |
|
1 kg |
1 g |
2 g |
3 g |
4 g |
|
2 kg |
2 g |
4 g |
6 g |
8 g |
|
5 kg |
3 g |
6 g |
9 g |
12 g |
|
10 kg |
5 g |
10 g |
15 g |
20 g |
|
20 kg |
10 g |
20 g |
30 g |
40 g |
|
50 kg |
15 g |
30 g |
45 g |
60 g |
|
100 kg |
25 g |
50 g |
75 g |
100 g |
|
200 kg |
50 g |
100 g |
150 g |
200 g |
|
300 kg |
75 g |
150 g |
225 g |
300 g |
|
500 kg |
100 g |
200 g |
300 g |
400 g |
|
1000 kg |
153 g |
300 g |
450 g |
500 g |
TABLE 19
Limit of Sensitiveness and Greatest Errors for Beam scales
(Class-D)
|
(1) |
(2) |
(3) |
(4) |
(5) |
|
KG |
G |
G |
G |
G |
|
1 |
1 |
2 |
3 |
4 |
|
2 |
2 |
4 |
6 |
8 |
|
5 |
5 |
10 |
15 |
20 |
|
10 |
10 |
20 |
30 |
40 |
|
20 |
20 |
40 |
60 |
80 |
|
50 |
30 |
60 |
90 |
120 |
|
100 |
50 |
100 |
150 |
200 |
|
200 |
100 |
200 |
300 |
400 |
|
300 |
150 |
300 |
450 |
600 |
|
500 |
200 |
400 |
600 |
800 |
|
1000 |
300 |
600 |
900 |
1200 |
TABLE 19-A
Leading Dimensions of Beam class (with pointer above the Beam)
|
Capacity |
Length between the end (Nominal) |
Depth at the Centre (Nominal) |
Thickness of plate at the Centre (Nominal) |
|
(1) |
(2) |
(3) |
(4) |
|
|
mm |
mm |
mm |
|
2 g |
70 |
10 |
2 |
|
5 g |
95 |
12 |
2 |
|
10 g |
100 |
15 |
2 |
|
20 g |
120 |
20 |
3.15 |
|
50 g |
135 |
22 |
3.15 |
|
100 g |
150 |
25 |
4 |
|
200 g |
170 |
25 |
5 |
|
500 g |
200 |
30 |
5 |
|
1 kg |
250 |
40 |
6 |
|
2 kg |
300 |
45 |
6 |
|
6 kg |
450 |
50 |
6 |
|
10 kg |
500 |
58 |
8 |
|
20 kg |
600 |
58 |
10 |
|
50 kg |
750 |
100 |
15 |
|
100 kg |
1000 |
110 |
18 |
|
200 kg |
1250 |
125 |
25 |
|
Open pattern (bridge) type |
|||
|
220 g |
170 |
25 |
5 |
|
500 g |
260 |
37 |
5 |
|
1 kg |
310 |
44 |
5 |
|
2 kg |
350 |
48 |
5 |
|
5 kg |
450 |
60 |
5 |
|
10 kg |
500 |
70 |
5 |
|
20 kg |
600 |
80 |
10 |
|
50 kg |
750 |
120 |
15 |
|
100 kg |
1000 |
150 |
20 |
TABLE 19-B
Leading dimensions of Beam Class 'B'
(plant and open pattern type with pointer below the beam)
|
(1) |
(2) |
(3) |
(4) |
|
|
mm |
mm |
mm |
|
2 g |
70 |
3 |
2 |
|
5 g |
95 |
3 |
2 |
|
10 g |
110 |
4 |
2 |
|
20 g |
120 |
20 |
3.15 |
|
50 g |
135 |
20 |
3.15 |
|
100 g |
150 |
20 |
4 |
|
200 g |
200 |
20 |
6 |
|
550 g |
235 |
25 |
8 |
|
1 kg |
300 |
30 |
8 |
|
2 kg |
320 |
30 |
8 |
|
5 kg |
350 |
32 |
10 |
|
10 kg |
400 |
40 |
12 |
|
20 kg |
500 |
50 |
14 |
|
50 kg |
700 |
70 |
18 |
|
100 kg |
800 |
80 |
20 |
|
200 kg |
1250 |
125 |
25 |
TABLE 19-C
Leading Dimensions of Beam, Class-C (Swan Neck Type)
|
(1) |
(2) |
(3) |
(4) |
|
100 g |
150 |
30 |
4 |
|
200 g |
200 |
40 |
5 |
|
500 g |
300 |
40 |
6 |
|
1 kg |
350 |
45 |
6 |
|
2 kg |
400 |
45 |
6 |
|
5 kg |
550 |
70 |
6 |
|
10 kg |
600 |
80 |
6 |
|
20 kg |
750 |
108 |
8 |
|
50 kg |
900 |
116 |
8 |
|
100 kg |
1200 |
133 |
14 |
|
200 kg |
1350 |
148 |
16 |
|
300 kg |
1650 |
154 |
18 |
|
500 kg |
1800 |
178 |
25 |
|
1000 kg |
2000 |
200 |
32 |
TABLE 19-D
Leading Dimensions of Beam Class C (Duck end type)
|
(1) |
(2) |
(3) |
(4) |
|
|
mm |
mm |
mm |
|
100 g |
150 |
35 |
4 |
|
200 g |
200 |
40 |
5 |
|
500 g |
300 |
40 |
6 |
|
1 kg |
350 |
45 |
6 |
|
2 kg |
400 |
45 |
6 |
|
5 kg |
450 |
70 |
6 |
|
10 kg |
450 |
75 |
8 |
|
20 kg |
600 |
75 |
8 |
|
50 kg |
750 |
80 |
8 |
|
100 kg |
900 |
120 |
14 |
|
200 kg |
900 |
133 |
16 |
|
300 kg |
1050 |
142 |
18 |
|
500 kg |
1350 |
192 |
20 |
|
1000 kg |
1650 |
203 |
25 |
TABLE 19-E
Leading Dimensions of Beam Class-D
|
Capacity |
Length between the end knife (edges Nominal) |
Depth at the centre (Nominal) |
Thickness of plate at the centre knife edge (Nominal) |
|
(1) |
(2) |
(3) |
(4) |
|
|
L |
D |
T |
|
kg |
mm |
mm |
Mm |
|
Swan-neck with fixed flat hook |
|||
|
1 |
350 |
45 |
6 |
|
2 |
400 |
45 |
6 |
|
5 |
550 |
70 |
6 |
|
10 |
600 |
80 |
6 |
|
20 |
750 |
108 |
6 |
|
50 |
900 |
116 |
8 |
|
100 |
1200 |
138 |
14 |
|
200 |
1350 |
148 |
16 |
|
300 |
1650 |
154 |
18 |
|
with detachable flat hooks |
|||
|
500 |
1800 |
178 |
25 |
|
1000 |
2000 |
200 |
32 |
PART II-A
PORTABLE SCALE FOR JEWELLERS
(1)
General.
This
part deals with the requirements of portable scale for Jewellers for weighing
diamonds, pearls and other jewels.
(2)
Definitions.
For
the purpose of this part, portable scale for jewellers shall mean equal armed
beam scale of capacity not exceeding 100 carats.
(3)
Capacity.
Portable
scales for jewellers shall be of capacities, 10, 20, 50 and 100 carats.
(4)
General requirements.
(a)
The beam shall be made of aluminium,
brass, ruckle-silver mild steel or stainless steel.
(b)
The beam shall be of swan neck type or
box end type.
(c)
The pans shall be made of aluminium,
brass, bronze, nickle-silver or stainless steel. The pans shall be hung by wire
stirrups, chains of aluminium, brass, bronze, nickle-silver of stainless steel
or by thread of silk or nylon.
(d)
All the three knife-edges, in the
cases of both swan neck and box end type scales, shall be hardened steel.
(e)
The central fork shall incorporate
hardened steel bearings of bush type, firmly fitted and secured.
(f)
The pan suspension shall be hooks of
figure S or ring; and made of hardened steel.
(g)
The beam shall be fitted with an
indicator (pointer) on the top in the centre with sufficient length to show
appreciable deflection. It shall be made of aluminium, brass, bronze, steel or
stainless steel wire and firmly fitted into the beam.
(h)
The Central fork shall have a
suspension hook to suspend the scale freely in use.
(i)
The fork suspension hook shall also
carry a metal label for markings as specified under clause 7.
(j)
The fork suspension hook shall be
brazed at its ends to prevent the above fork suspension or label being easily
removed. The label shall be made of aluminium, brass, bronze, copper,
ruckle-silver or stainless steel sheet.
(k)
The scale shall have a pocket carrying
case to prevent damage to it.
(5)
Leading Dimensions.
(a)
The leading dimensions for portable
Scale for jewellers shall be as specified in Table 19-B.
TABLE 19-F
Leading Dimensions for Portable scales for Jewellers
|
Capacity |
Length of beam nominal |
Cross section of beam Depth X Thickness Nominal |
Pan diameter nominal |
|
(1) |
(2) |
(3) |
(4) |
|
|
mm |
mm x mm |
mm |
|
10 |
70 |
3 x 2 |
20 |
|
20 |
80 |
4 x 3 |
25 |
|
50 |
90 |
5 x 3 |
30 |
|
100 |
100 |
5 x 4 |
35 |
Note.
Permissible variation +10 per cent of the dimensions.
(6)
Tests.
(a)
The beam shall remain horizontal
without load when in equilibrium.
(b)
In the case of beams with detachable
suspension hooks and pans; when interchanged, the beam shall maintain its
equilibrium at no load.
(c)
The scale shall be tested for
sensitiveness and error when loaded in each pan with full load equivalent to
its capacity;
(d)
The limits of sensitiveness and error
for portable scales for jewellers at full load shall be as given in Table-19-G.
TABLE 19-G
Limits of Sensitiveness and Error for Portable Scale for
Jewellers
|
Capacity Carat |
Sensitivity Cent |
Errors at full load cent |
|
10 |
0.5 |
1 |
|
20 |
0.5 |
1 |
|
50 |
1 |
2 |
|
100 |
1 |
2 |
(7)
Markings.
(a)
The metal label fixed in the fork
suspension hook shall be 50 mm x 20 mm. It shall be marked on one half side
with the capacity and the marker's name. The other half shall be left blank for
receiving the inspector's stamp.
(b)
The capacity shall be inscribed on the
metal plate in the following manner:
To,
weigh............c.
(8)
Seal.
(1)
The Inspector's stamp shall be put on
the metal label mentioned in clause 4(i)."
(2)
In Part III for Tables 20 and 21 the
following tables shall be substituted, namely:
TABLE 20
Sensitiveness and errors for platform machines
|
|
Verification |
|
|
Inspection |
|
|
|
Capacity |
Sensitiveness when fully loaded |
Greatest error allowed in excess or in deficiency when fully loaded for |
Sensitiveness when fully loaded |
Greatest error allowed in excess or in deficiency when fully loaded for |
||
|
|
|
Non-dial type machines |
Platform machines filled with dials |
|
No-dial type machines |
Platform machines fitted with dials |
|
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
|
10 kg |
2 g |
4 g |
A weight corresponding to one half the internal between consecutive
minimum graduations |
6 g |
8 g |
A weight corresponding to the interval between consecutive minimum
graduations |
|
20 kg |
2 g |
8 g |
|
12 g |
15 g |
|
|
50 kg |
10 g |
20 g |
|
30 g |
40 g |
|
|
100 kg |
20 g |
40 g |
|
60 g |
80 g |
|
|
150 kg |
30 g |
60 g |
|
90 g |
120 g |
|
|
200 kg |
40 g |
80 g |
|
120 g |
160 g |
|
|
250 kg |
50 g |
100 g |
|
150 g |
200 g |
|
|
300 kg |
60g |
120 g |
|
180 g |
240 g |
|
|
500 kg |
100 g |
200 g |
|
300 g |
400 g |
|
|
1000 kg |
125 g |
250 g |
|
315 g |
500 g |
|
|
1500 kg |
200 g |
400 g |
|
600 g |
800 g |
|
|
2000 kg |
250 g |
500 g |
|
750 g |
1000 g |
|
|
3000 kg |
300 g |
1000 g |
|
900 g |
2000 g |
|
TABLE 21
Range of Balancing Arrangement of Platform machines
|
Range of Balancing Arrangement |
|||
|
Capacity |
Maximum 0.5 percent of capacity |
Minimum 0.25 percent of capacity |
Not less than 0.125 percent is x way |
|
(1) |
(2) |
(3) |
(4) |
|
10 kg |
50 kg |
125 kg |
... |
|
20 kg |
100 kg |
25 kg |
... |
|
50 kg |
250 kg |
12.0 kg |
60 kg |
|
100 kg |
500 kg |
250 kg |
120 kg |
|
150 kg |
750 kg |
370 kg |
180 kg |
|
200 kg |
1000 kg |
500 kg |
250 kg |
|
250 kg |
1.3 kg |
620 kg |
310 kg |
|
300 kg |
1.5 kg |
750 kg |
370 kg |
|
500 kg |
2.5 kg |
125 kg |
620 kg |
|
1000 kg |
5.0 kg |
250 kg |
1.25 kg |
|
1500 kg. |
7.5 kg |
3.75 kg |
1.87 kg |
|
2000 kg. |
10.0 kg |
5.00 kg |
250 kg |
|
3000 kg |
15.0 kg |
7.50 kg |
3.75 kg |
(3)
after part VI the following part shall
be inserted namely:
PART VI-A
TUBULAR BALANCES
(1)
General.
This
part deals with the requirements for Tubular Balance with graduated scale.
(2)
Definitions.
A
Tubular balance shall mean a weighing instrument, which on the application of
the load be weighed, indicated the weight of the load by the extension of a
spring, such extension being indicated by means of a pointer on a graduated
scale, which is longitudinally marked on the tube.
(3)
Capacities.
The
capacities and the maximum permissible error on tubular balances shall be as
specified in Table.
(4)
General Requirements.
(a)
The body of the instrument shall be
made or manufactured from brass, bronze, aluminium, mild steel or any other
suitable material but the tubes shall be made or manufactured from non-rusting
material only. The body of the balance shall be robust in construction.
(b)
If a pan or a scoop is" provided,
it shall be made of brass, bronze, aluminium, mild steel, stainless steel or
polystyrene metal Chains, hooks or metal support shall be provided if the pan
or scoop is suspended. When the pan is made or manufactured from mild steel it
shall be suitably protected against erosion.
(c)
The indicating device shall be divided
into graduations representing equal weights into equal divisions and the
distance between the lines representating minimum graduation shall be not less
than 1.25 mm.
(d)
The weight corresponding to the
minimum graduation shall not exceed the values given in the Table.
(e)
When the graduation commences at a
fixed load, the position of the pointer when there is no load, shall be clearly
indicated by a zero mark.
(f)
The tubular balance shall be suspended
permanently from a stand, support or bracket.
(g)
The scale shall be provided with a
device to prevent" the effect of any over-loading which may adversely
affect its metrological qualities.
(5)
Tests.
(a)
The maximum permissible-error, shall
not be exceeded when the load is applied (on hook or in pad or scoop) (See Table)
(b)
Each graduation shall be tested for
accuracy.
(c)
The balance shall be correct, whether
the test is made by progressively increasing or decreasing loads, provided
that, in either case the spring shall be allowed to vibrate before the reading
is taken.
(d)
The difference between the results of
several weighments or the same test load shall not exceed the maximum
permissible error of the bad.
(e)
The balance shall be loaded to useful
capacity and the load maintained for a period of 24 hours after which it shall
be removed. Four hours after removal of the load, the balance shall not show
any permanent set. Further when tested as stated in sub-clause (c) of this
clause, the balance shall record correct readings.
(f)
The tubular balance shall not be
tested for sensitiveness.
(g)
The standard test weights used for the
verification of the scale shall not be inaccurate by a relative error of more
than 0.3 times. (See maximum permissible, error of the scale for the given
load).
(6)
Sealing.
A
provision shall be made to seal the tubular balance by means of a soft lead
plug or wire and wherever practicable this plug shall pass through the frame.
The lead plug or wire seal shall be so supported as to allow on risk or injury
to the instrument. The Inspector's stamp shall be affixed on the lead plug or
on a suitable lead plug in conjunction with the wire.
TABLE 24-A
Capacities and Maximum permissible Error for Tubular
Balance
|
Capacity |
Maximum weights corresponding to the distance between minimum
graduations |
Maximum permissible on initial verification |
|
(1) |
(2) |
(3) |
|
l Kg |
20 Kg |
10 Kg |
|
5 Kg |
100 Kg |
50 Kg |
|
10 Kg |
200 Kg |
100 Kg |
|
20 Kg |
500 Kg |
250 Kg |
|
50 Kg |
500 Kg |
250 Kg |
Notes.
Inspection errors shall be double the values shown in Column 3
TABLE 25
Sensitiveness and Errors for Weighbridges
|
Capacity of Machine |
|
Verification |
|
Inspection |
||
|
Sensitiveness when fully loaded |
Greatest error allowed in excess or in deficiency when fully loaded for |
Sensitiveness when fully loaded |
Greatest error allowed in excess or in deficiency when fully loaded |
|||
|
Non-dial type machine |
Machines fitted with dials |
Non-dial type machines |
Machines fitted with dial |
|||
|
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
|
|
Kg. |
Kg. |
Kg. |
Kg. |
Kg. |
Kg. |
|
1,000 Kg (1t) |
1.1 |
1.2 |
2.4 |
3.3 |
2.4 |
4.8 |
|
2,000 Kg. (2t) |
1.2 |
|
1.4 |
3.6 |
2.3 |
5.6 |
|
3,000 Kg (3t) |
1.3 |
1.6 |
3.2 |
3.9 |
3.2 |
6.4 |
|
5,000 Kg. (5t) |
1.5 |
2.0 |
4.0 |
6.0 |
4.0 |
8.0 |
|
10,000 Kg. (10t) |
2.0 |
3.0 |
6.0 |
6.0 |
6.0 |
12.0 |
|
15,000 Kg. (15t) |
2.5 |
4.0 |
8.0 |
7.5 |
8.0 |
16.0 |
|
20,000 Kg (20t) |
30 |
5.0 |
10.0 |
9.0 |
10.0 |
20.0 |
|
25,000 Kg. (25t) |
35 |
6.0 |
12.0 |
10.5 |
12.0 |
24.0 |
|
30,000 Kg. (30t) |
4.0 |
7.0 |
14.0 |
12.0 |
14.0 |
28.0 |
|
40,000 Kg (40t) |
5.0 |
7.0 |
14.0 |
15.0 |
14.0 |
28.0 |
|
50,000 Kg. (50t) |
5.2 |
7.8 |
15.6 |
15.6 |
15.6 |
31.2 |
|
60,000 Kg (60t) |
5.5 |
8.5 |
17.0 |
16.5 |
17.0 |
34.0 |
|
80,000 Kg. (80t) |
6.0 |
10.0 |
20.0 |
18.0 |
20.0 |
40.0 |
|
1,00,000 Kg. (100t) |
6.5 |
11.5 |
23.0 |
19.5 |
23.0 |
46.0 |
|
2,00,000 Kg (200t) |
9.0 |
19.0 |
38.0 |
27.0 |
38.0 |
26.0 |
|
2,50,000 Kg.(250t) |
12.0 |
25.0 |
|
36.5 |
50.0 |
... |
|
|
A weight corresponding to one half the interval between consecutive
graduations. |
|
A weight corresponding to interval between consecutive graduations. |
|||
TABLE 26
Range of balancing arrangement for weigh bridges
|
|
Range of balancing Arrangement |
||
|
Capacity |
Maximum 05 per cent of Capacity |
Minimum 0.25 per cent of capacity |
Minimum 0.125 per cent of capacity each way |
|
(1) |
(2) |
(3) |
(4) |
|
1,000 kg |
5 kg |
2.5 kg |
13 kg |
|
2,000 kg |
10 kg |
5.0 kg |
25 kg |
|
3,000 kg |
15 kg |
7.0 kg |
3.7 kg |
|
5,000 kg |
25 kg |
12.0 kg |
6.2 kg |
|
10,000 kg |
50 kg |
25.0 kg |
12.5 kg |
|
15,000 kg |
75 kg |
375 kg |
18.7 kg |
|
20,000 kg |
100 kg |
50.0 kg |
25.0 kg |
|
25,000 kg |
125 kg |
62.5 kg |
31.7 kg |
|
30,000 kg |
150 kg |
75.0 kg |
37.5 kg |
|
40,000 kg |
200 kg |
100.0 kg |
50.0 kg |
|
50,000 kg |
250 kg |
125.0 kg |
62.5 kg |
|
60,000 kg |
300 kg |
150.0 kg |
75.0 kg |
|
80,000 kg |
400 kg |
200.0 kg |
100.0 kg |
|
1,00,000 kg |
500 kg |
250.0 kg |
125.0 kg |
|
2,00,000 kg |
1000 kg |
250.0 kg |
250.0 kg |
|
2,50,000 kg |
1250 kg |
... |
312.0 kg" |
(4)
After part X the following part shall
be added, namely:
"PART XI
KITCHEN SCALES
(1)
General.
(a)
This part deals with the requirements
of Kitchen Scales which are intend for measuring quantities of commodities for
cooking purpose and other uses where great accuracy is not required.
(b)
Kitchen scales shall not be used in
any transaction for trade or commerce.
(c)
Kitchen scales shall be verified
before sale, and may be verified, if the user so desires.
(2)
Definition.
A
Kitchen scale shall mean a weighing instrument having a goods pan and a
graduate scale, which can be used for weighing commodities or ingredients for
cooking purposes.
(3)
Capacity.
The
capacities of kitchen scales shall be as specified in Table 32.
(4)
General Requirements.
(a)
The body, the pan or scoop and
components of the Kitchen scale shall be constructed of suitable quality steel,
non-ferrous metal or shock-absorbing plastic material sufficiently strong to
withstand normal use, and capable of being easily cleaned. All steel parts
shall be suitably protected to prevent rusting but the protective coating shall
not be deleterious to health.
(b)
The pan or scoop shall be easily
removable and shall be smooth and capable of being cleaned easily. It shall not
tip over when evenly filled. The scoop if provided, shall have cubic capacity
of not less than one litre. It shall incorporate devices for pouring out easily
the commodities weighed, or measured in it.
(c)
The scoop may also be provided with
approximate volume indications may be accurate to within 10 per cent of the
indicated volume.
Note.
The volume may not be verified on every kitchen scale, but only on a few pieces
in a lot.
(d)
The indicating device shall be divided
into graduations representing equal weights. The distance between the lines
representing the minimum graduation shall be:
(i)
not less than 1.25 mm, if the
graduations are read directly and
(ii)
not less than 2 mm. after
magnification, if a minifying device is provided.
(e)
The weight corresponding to the
minimum graduation shall not exceed the values given in table 32.
(f)
The value of graduation shall be
indicated only in metric units and shall be equal to a number of kilograms
expressed by one of the following formulae;
1
x 10", 2 x 10" or 5 x 10"
when
"n" represents either zero or a whole number, positive or negative.
(g)
The total number of graduations shall
not be less than 100 but not more than 1000.
(h)
The dial and pointer may be enclosed
by a suitable lens to increase legibility of the reading.
(i)
The graduation lines shall be of
reasonably uniform thickness throughout their length.
(j)
Every fifth graduation line shall be
longer and at least every tenth graduation line shall be numbered.
(k)
The pointer may preferably be in a
contrasting colour to the graduation lines and the dial. The pointer may meet
the graduation lines and may cover but not obscure them. The width of the tip
of the pointer shall not exceed the thickness of the graduation lines.
(l)
Where the scale is graduated at every
20 g. graduation lines to indicate odd multiples of 50g, may be provided on the
side opposite to that bearing graduation lines of 20 g.
(m)
When the graduation commences at a
fixed load the position of the pointer, when there is no load, shall be clearly
indicated by a zero mark.
(n)
The scale may be provided with a zero
setting device. The range of adjustment of the zero setting device, if
provided, shall not exceed ten per cent of the capacity of the scale.
Notes.
The large of adjustment is provided to accommodate the tare of other containers
which might be placed on the pan for receiving viscous or other materials.
(o)
The scale shall be provided with a
device to prevent the effect of any overloading which may adversely affect its
meteorological qualities.
(5)
Tests.
(a)
The scale shall be tested on a hard,
flat and level surface.
(b)
The difference on return to zero,
immediately after removing a load, equal to the capacity kept on the instrument
for half an hour shall not exceed half the value of the minimum graduation.
(c)
The maximum permissible error at any
load upto full capacity shall not exceed the limits specified in Table 32 at
the time of initial verification.
(d)
The scale shall be correct within the
maximum permissible errors, whether the test is made by progressively
increasing or decreasing loads specified in Table 1, provided that, in either
case; the spring if provided shall be allowed to vibrate before the reading is
taken.
(e)
When a weight equal to quarter of the
maximum capacity is moved from the centre of the scoop or pan in any direction
to a distance of 50 mm. the scope or pan shall not tip or topple.
(f)
The difference between the results of
several weighments of the same tests load shall not exceed the maximum
permissible error for the load.
(g)
Five per cent of one lot of kitchen
scale be initially verified by placing a test load equal to the full capacity
of the instrument, for a period of about 8 hours. The difference between the
indication, immediately after depositing the load and the constant indication,
obtained 8 hours later shall not exceed the maximum permissible error for that
load.
(h)
When tested for model approval, the kitchen
scale shall not show an error exceeding twice the maximum permissible error,
after being subjected to 7,500 weighings at full load. These weighings shall be
made quick succession but shall be limited to not more than 20 weighing per
hour.
(i)
The standard test weights used for the
verification of the scale shall not be inaccurate by a relative error of more
than 0.3 times the maximum permissible error of the scale for the given load.
(6)
Scaling.
(a)
Kitchen scales shall be provided with
a soft plug at a suitable place to receive the Inspectors' stamp and this plug
shall pass through the frame. The plug shall be so supported as to allow no
risk or damage to the instrument.
TABLE 32
Capacities, graduation and Maximum permissible errors for
Kitchen scale
|
Capacity |
Maximum weight corresponding to the distance between minimum graduation |
Test load |
Maximum permissible error, at initial verification |
|
(1) |
(2) |
(3) |
(4) |
|
1 kg. |
10 g. |
From 0 upto and including 500 g. Above 500 g. |
± 5g. ±10 g. |
|
2 kg. |
20 g. |
From 0 upto and including 1 kg Above 1 kg |
±10 g. ±20 g. |
|
5 kg. |
50 g. |
From 0 upto and including 2.5 kg. Above 25 kg. |
± 25 g. ± 0 g. |
Note.
The maximum permissible errors at the time of verification if any, shall be
double of those specified in Table 32."