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What We
Offer
OIML Weights & Weights Sets
- Weightronics precision weights conform to the
standard of the Organization International de
Metrologie Legale (OIML) International
Recommendation R111-1 Edition 2004(E). Weights are
required for used in all the research & development,
industries, commerce, laboratories, pharmaceuticals
and every standard business, official bodies are
required these high precision classified weights and
weights sets to fulfill their Quality Standards such
as ISO 9001:2008, GLP - Good Laboratory Practice, GMP – Good Manufacturing Practice. They are
manufactured of Austenitic Stainless Steel with low
magnetic permeability and high resistance to
corrosion. All surfaces are polished to a perfect,
mirror like finish.
Weightronics precision weights are available in
Classes E1, E2, F1
and F2. Weights specifications are
designed so the specification on all surfaces
finish, marking, construction, material density and
magnetic properties get more restrictive as the
weight tolerances get smaller in order to enable the
weight to maintain its tolerances over time. The
tolerances for the various classes are established
in a manner that enables weights of higher classes
to calibrate weights of the next lowest class.
Example: Class E2 weights can be used to
calibrate class F1 weights.
To get the proper accuracy from your weighing
balances provides, you need to perform routine
Calibration & Adjustments using the Precision
Calibration Weights. Always use the Standard Weights
one class ahead than the readability of the weighing
balance by that you will get the proper results of
your balance. An example that an electronic balance
used by a jeweler which gives the result of Accuracy
Class M1 then the accuracy of that
balance is to be verified by the weights of Accuracy
Class F2 weights.
OIML R111 - This international document
describes the physical characteristics and
metrological requirements of weights that are used
for the verification of weighing instruments, for
the verification of weights of a lower class of
accuracy and with weighing instruments. This
document includes a recommendation for seven classes
from E1, E2, F1, F2,
M1, M2, M3 of
weights in tiers of uncertainty. Please see the
Table of Tolerances Chart on the tolerances of each
weight of a given OIML Class.
Class E1 - Used as primary
reference standard for calibrating other reference
standard and weights where the stability of the
environment and careful handling are assured.
Although very stable, one-piece construction Class E1
weights have no method of adjustment and are not
suitable for general laboratory use.
Class E2 - Used as reference
standard for calibrating other weights and is
appropriate for calibrating high precision
analytical balances with readability as low as 0.1
mg to 0.01 mg. Class E2 weights can also
be used to calibrate Class F1 weights.
Class F1 - Used for calibrating
high precision top loading balances with a
readability as low as 0.01 g to 0.001 g. Class F1
weights can also be used to calibrate Class F2
weights.
Class F2 - Used for calibrating
semi analytical balances and for student use. Class
F2 weights can also be used to calibrate
weighing instruments for important commercial
transaction like gold and precious stones. Class F2
weights can also be used to calibrate Class M1
weights.
Class M1, M2, M3
- Economical weights for general laboratory,
industrial, commercial, technical and educational
use.
Construction and
Shape
As specified in OIML R-111,
Weightronics Precision Weights are available in one
or two-piece construction.
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Weightronics Precision
Weights 500 mg and below are made up of sheet
metal and are one-piece construction with one
side turned up to make them easy to handle with
forceps. Corners and edges are smooth. There are
no markings permitted on any sheet metal weights
500 mg and below. The nominal values of weights
500 mg and below are determined by the shape of
the weight according to the following table.
|
 |
Shape |
Shape Denomination |
| Pentagon |
500 mg, 50 mg, 5 mg |
| Square |
200 mg, 20 mg, 2 mg |
| Triangle |
100 mg, 10 mg, 1 mg |
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Weightronics Precision
Weights 500 mg and also available in wire
construction as opposed to sheet metal with the
same shape configuration as listed in the above
table. Weightronics wire weights have one end
turned up as well to allow for easy handling
with forceps. The nominal values of weights 500
mg and below are determined by the shape of the
weight according to the following table.
|
 |
Shape |
Shape Denomination |
| 5 Segments |
500 mg, 50 mg, 5 mg |
| 2 Segments |
200 mg, 20 mg, 2 mg |
| 1 Segment |
100 mg, 10 mg, 1 mg |
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Weightronics Precision
Weights 1 g and above can be either one or
two-piece construction. Weightronics OIML
Precision Weights 1 g and larger are cylindrical
in shape with a tapered neck for easy gripping.
They are perfectly flat on top to stack easily
on centre. Weights bottoms are slightly recessed
to expose the smallest possible area to wear.
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One-piece construction
indicates the weight is manufactured from a
single uniform piece of raw material, the weight
has no other material added to it, and it has no
method of adjustment other than removing
material by grinding or polishing. One-piece
weights are difficult to manufacture as the only
method of final adjustment is removing material
by fine grinding or polishing. Class E1 and E2
weights 1 g and larger are cylindrical in shape
and are of One-piece construction.
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Two-piece construction
indicates that the weight is constructed of
multiple pieces of raw material. In Weightronics
Precision Weights, weight body is constructed
from one piece of material and the lifting knob
or head is constructed from a different piece of
raw material. Although the head and body may
come from different bars of raw material, they
are the same grade and type of raw material with
the same densities. The knob or head typically
screws into the body and one can barely tell the
weight is not constructed of one piece of
material. There is cavity below the knob thread
in the body, which contains adjusting material
that is typically the same material from which
the weight is made. Class F1 and F2 weights 1 g
and larger are cylindrical in shape and are of
two-piece construction.
Presentation
The weights in Weightronics sets
have the same features as the individual weights of
their corresponding class. Weightronics weights and
weights sets of Accuracy Class E1, E2, F1, F2 are
supplied in a Fine Polished Steam Beach Handmade
Strong Wooden Cases lined with velvet along with the
matching accessories like forceps for lifting the
fractional and smaller weights, brushes and Piece of
Chamois Leather for cleaning the weights, gloves for
not to touch weights with naked hands.
Weights Set
Information
Weightronics weights sets are
supplied in a 5-2-2-1 series. 5-2-2-1 series means
that weights beginning with a "5" and "1" are single
in each decade and weights beginning with a "2" are
doubled in each decade. For Example: for a set with
5-2-2-1 series from 200 g to 1 g, there is two 200
g, one 100 g, one 50 g, two 20 g, one 10 g, one 5 g,
two 2 g and one 1 g.
Accessories
Weightronics also provides you
all the accessories you need to properly handle and
protect your Precision Weights and Weights Sets.
Please contact us for information on new cases,
replacement cases or special cases you need to store
and protect your Precision Weights and Weights Sets.
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