NSI/ASTM Classes 1, 2, 3 and 4 and Troemner UltraClass Stainless Steel Electronic Balance Calibration Weights
> General Information
> Why UltraClass?
> ANSI/ASTM Class Tolerances
> Construction and General Shape
> Surface Finish
> Suggested Applications
> Weight Set Configuration Information
> Ordering a Certificate With Your Weight
or Weight Set
> Ordering Table
To get all the accuracy your electronic balance and/or scale provides, you
need to perform routine calibrations and verifications using precision
calibration weights. Troemner's Stainless Steel Electronic Balance
Calibration Weights are intended for this purpose and are available in
Troemner UltraClass and ANSI/ASTM Classes 1, 2, 3 and 4 in sizes ranging
from 10 g to 30 kg. Weights are available in a cylindrical design up to 5 kg
and a stackable grip-handle design from 5 kg to 30 kg for all necessary
testing, calibration and adjustment of electronic scales and balances. All
ANSI/ASTM E617 class weights meet or exceed specifications for tolerance,
construction, surface finish, and magnetism as outlined in ANSI/ASTM E617.
Weights 5 kg and below are supplied in protective cases.
It is recommended that the tolerance of the weight you select have a
tolerance limit that is 1/3 of the readability of the balance and/or scale
you are checking or calibrating. For more information refer to the Weight
Selector or check the Mass Standards Handbook.
Troemner UltraClass weights are the most precise type II two-piece weights
available with weight tolerances 50% greater than ANSI/ASTM E617 Class 1
tolerances. UltraClass weights combine high precision with the advantage of
two-piece construction (1 g and larger) avoiding costly replacement issues
associated with one-piece weights.
ANSI/ASTM Class Tolerances
Stainless Steel Electronic Balance Calibration Weights are adjusted to
ANSI/ASTM classes 1, 2, 3 and 4 and Troemner UltraClass. Troemner UltraClass
weight tolerances are 50% better than ANSI/ASTM E617 Class 1. Please see the
Tolerance Chart within the Mass Standards Handbook for specific tolerances
for each weight.
Construction and General Shape
All ANSI/ASTM E617 class weights and Troemner UltraClass meet or exceed
specifications for tolerance, construction, surface finish, and magnetism as
outlined in ANSI/ASTM E617. Troemner's Electronic Balance Calibration
Weights are manufactured from the highest quality stainless steel alloy,
possessing closely controlled density, low magnetic susceptibility, good
stability and resistance to corrosion and damage through handling. All of
Troemner's Electronic Balance Calibration Weights are type II which have an
adjusting cavity to allow for adjustment during future calibrations. Within
the weight there is a cavity that is filled with adjusting material,
typically the same material from which the weight is made. This cavity is
sealed during the production process to ensure the stability of the weight.
Electronic Balance Calibration Weights are cylindrical in shape and flat on
top, to stack easily on center.
- Weights from 10 g to 500 g are machined as straight cylinders with the
adjusting cavity opening in the bottom of the weight.
- Cylindrical weights from 1 kg to 5 kg are machined as cylinders and have a
groove around the diameter approximately 25% from the top of the weight to
allow for easier handling. The adjusting cavity opening is in the bottom of
the weight for the 1 kg weight and on the top of the weight for the 2 kg
through 5 kg.
- Grip handle weights from 5 kg to 30 kg have a recess in the top center of
the weight with a lifting handle spanning the recess slightly below the top
surface of the weight. The recess allows the user to pick up the weight
using the handle and provides clearance for the user's hand. Grip handle
weights 5 kg to 10 kg are 5 inches in diameter. Grip handle weights above 10
kg to 30 kg are 6 inches in diameter. The adjusting cavity for grip handle
weights is within the lifting handle.
- Click here to view a table that describes the material used in the
construction of all of Troemner's Electronic Balance Calibration Weights
Troemner UltraClass as well as ANSI/ASTM Classes 1, 2, and 3 have all
surfaces polished to a perfect, mirror like finish. ANSI/ASTM Class 4
weights have a satin like appearance and finish. All surface finishes meet
or exceed ANSI/ASTM E617 specifications. For ANSI/ASTM E617 Surface Finish
specifications see the Mass Standards Handbook. Surface finish for Troemner
UltraClass meets or exceeds ANSI/ASTM E617 Class 1 specifications.
- It is recommended that the weight selected to calibrate a balance and/or
scale have a tolerance small enough as not to be detected by the balance
and/or scale. Troemner recommends the tolerance of a weight selected for
calibrating a balance and/or scale is no more than 1/3 of the readability or
precision of the balance and/or scale being calibrated. If this cannot be
achieved, it is suggested that a Class 1 or Troemner UltraClass Electronic
Balance Calibration Weight with a NVLAP certificate be ordered which
provides the actual mass value for the weight which reduces measurement
- Electronic Balance Calibration Weights can also be used to check or verify
the accuracy of your balance and/or scale between calibrations. It is
recommended that the user check a balance and/or scale prior to each use.
Keeping the weight at or near the balance and/or scale keeps the weight at
the same temperature as the equipment.
- To safeguard your Electronic Balance Calibration Weights, impact resistant
polypropylene weight cases are provided with 10 g to 5 kg weights. These
self-hinged cases have snug-fitting foam interiors to protect weights when
not in use. A white cotton glove for handling weights is provided in each
case or carton.
- Cases with handles for larger Electronic Balance Calibration Weights (8 kg
through 30 kg) are available at an additional cost. These cases are made of
high-impact plastic, reinforced with metal edges/corners and have a padded
carrying handle. To ensure proper handling, a white cotton glove is provided
with all weights.
**Caution** Weight cases are not intended to be used as shipping containers.
When you ship your weights to be calibrated, the weights and weight sets
must be overpacked in larger containers and/or cartons to protect your
- See the Accessories section for part numbers for cases.
One weight set is available in Electronic Balance Calibration Weight design.
The set consists of one 1 kg, one 500 g, one 300 g, one 200 g, and one 100
g. The set is supplied in a plastic case with a handle on top, and with a
white cotton glove.
Weight Set Configuration Information
There is a choice of certificates available for your Electronic Balance
Calibration Weight or Weight Set to meet your traceability and compliance
needs. Complete information on our calibration certificates and samples of
certificates are located in the Mass Calibration and Certificate Options
section of the web site.
Ordering a Certificate With Your Weight or Weight Set
- Weights and Weight Sets supplied without weight certificates come with
Troemner's Statement of Accuracy (view sample of certificate).
- To order Troemner's NVLAP Weight Calibration Certificate (view sample of certificate), specify the
Troemner part number using the table at the end of this section followed by
"W". For part numbers, please reference the Ordering Table below.
- To order Troemner's UKAS Certificate of Calibration (view sample of certificate), specify the Troemner
part number followed by "NA". For part numbers, please reference the Ordering Table below.
- To order Troemner's Traceable Certificate (view sample of certificate), specify the Troemner part
number followed by "T". For part numbers, please reference the Ordering Table below.
- To order Troemner's Mass Code Report of Mass Values (please contact Troemner for more information), specify the Troemner
part number followed by "M". For part numbers, please reference the Ordering Table below.
Troemner Electronic Balance Calibration Weights are also available in Avoirdupois denominations.
Please contact a Troemner sales representative for more information.
Stainless Steel Electronic Balance Calibration Weights
Stainless Steel Electronic Balance Calibration Weight Sets
Troemner can provide you with all the accessories you need to properly
handle and protect your Electronic Balance Calibration Weights. A case and
cotton glove are included for weights 10 g through 5 kg. Cases for larger
weights are available at an additional cost. Please contact a Troemner sales
representative for specific information on new cases, replacement cases, or
special cases you need to store and protect your Electronic Balance
Electronic Balance Calibration Weight Accessories
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Alloy 8 Stainless Steel
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Weight Selector takes
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choosing the correct
weight for your application.
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Have you thought about your compliance requirements and the type of certification you need? Refer to the Mass Calibration and Certificates Option section on this web site for determining your needs.
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