Capabilities from 0.050 mg to 2000 kg (0.00001 oz to 5000 lb).
NVLAP* and UKAS** Accredited Certificates available.
Troemner is the country's largest independent commercial mass metrology
laboratory offering complete, full-time weight calibration services.
Troemner's weight calibration laboratories and processes are
17025 compliant. Troemner’s Calibration Laboratories
have the capability of providing weight calibrations from 0.050
mg to 2000 kg (0.00001 oz to 5000 lb). Troemner's Weight Calibration process can generate uncertainties equal to national laboratories.
has earned dual accreditations for performing weight calibrations
from the National Institute of Standards and Technology (NIST)
-administered National Voluntary Laboratory Accreditation
and the United Kingdom Accreditation Service (UKAS).
These accreditations, as well as our ISO
9001 registration, require Troemner to routinely undergo
rigorous audits assuring our customers that their precision
calibration weights and mass standards meet the highest quality
standards around the world. Troemner has the added distinction
of being the only United States Mass Metrology Laboratory
with both NVLAP* and UKAS* accreditations.
Weight Calibration Services QuickLINKS:
> Facility and Environment
> Weight Calibration Services
> Weight Recalibration Service Request for Quote/Order Form
> Calibration Devices - Alphabetical List
> Calibration Devices Listed by Service
Troemner's Mass Laboratories are constructed to meet the strict environmental
guidelines listed in NIST/NVLAP
Handbook 150-2G section 2.8. In fact, our Level I Laboratory
exceeds the Environmental Cleanliness System according to
Class 1,000 requirements. Troemner's Level I Laboratory has
been accredited for weight calibrations by both NVLAP* and UKAS**
Troemner's Level I Laboratory is comprised of two rooms, the Calibration
Laboratory and the Automated Mass Comparator Laboratory. The
climate in the Level I Laboratory is strictly monitored and
controlled. Temperature in the laboratory is measured to 0.01
degree C and controlled to within 0.2 degree C, with no more
than a 0.2 degree C change per hour. Humidity is measured
to ± 2% with no more than a 5% change per hour. Barometric
pressure is measured to 0.01 mm Hg. Multiple Hepa-filtered
air vents comprise 50% of the ceiling. This reduces air velocity
and air currents in the laboratory, which increases mass comparator
performance while maintaining close environmental control.
Troemner's Level III Laboratory is also accredited by NVLAP*. Here weights
are calibrated to NIST Class F tolerances in the range from
300 g to 1,000 kg (0.05 lb to 3,000 lb) as outlined in NIST
Handbook 105-1, Specifications and Tolerances for Reference
Standards and Field Standard Weights and Measures.
comparators used in Troemner's Calibration Laboratories are
state-of-the-art with the highest precision possible. Troemner
currently has 34 mass comparators, four of which are automated
for calibrating ultra precise mass standards. All mass comparators
are positioned on marble tables. Troemner’s most recent
acquisition is a Mettler Toledo, Inc. AX64004 Automated Mass
Comparator for large precision weights from 10 kg to 60 kg.
Troemner is the only independent calibration laboratory in
the United States that can provide calibrations with this
type of balance.
comparator has its own temperature probe mounted within the
weighing chamber to measure the temperature at the time of
calibration in order to make an accurate air buoyancy correction.
Comparators are interfaced to a file server outside the lab
for processing calibration data. Custom software programs
ensure the accuracy of the data collection process and eliminate
transposition errors. The laboratory staff takes many precautions
to ensure that these sensitive instruments work to their maximum
level of accuracy. Measurements for OIML Class E1 and ASTM
Class 0 Weights are made in the Automated Mass Comparator
Laboratory, as well as the surveillance of Troemner's primary
four person metrology staff has received training in weight
calibrations at NIST and has extensive experience in weight
calibration. Many of the calibration technicians have also
received training from NIST in addition to extensive in house
procedures for the highest precision weights include redundant
measurements against multiple standards to assure that your
calibration is of the highest quality. During a calibration
of high precision weights, the values of the two standards
used are verified against one another to assure accuracy of
the calibration. Troemner maintains three sets of Primary
Mass Standards directly traceable to NIST.
Weight Density History
the years, Troemner has used various stainless steels
in the production of our weights, including our newest
material, Alloy 8 Stainless
is a Weight Density History table that provides the
density history for a variety of different weights. For
identifying old style precision weights verses new
style precision weights, please refer to How
to Distinguish Troemner’s New Weight Material.
Calibration Services Include:
"As Found" and "As Left" calibrated
– Foreign contaminants on weights will be removed
– If weights are found to be out of tolerance, then
the weights can be adjusted (2 piece weights only)
certificate provided with your weights
following services are available at extra charge:
Weight Calibration and
Troemner offers a variety of standard calibration services and certificates
to meet your particular needs. We can also customize documentation
to meet your requirements. Below is a description of the various
certificates available from Troemner:
- NVLAP Accredited Mass Code Report of Mass Values - Troemner Mass Code Report of Mass Values is available for one-piece weights in ANSI/ASTM E617 Class 000, 00, 0 and OIML R 111 Class E0, E1 and E2, and is the same report one would receive if weights were calibrated directly by NIST. This calibration delivers uncertainties, which are the lowest available by a commercial laboratory matching those of many National Metrology Institutes. Troemner utilizes a calibration software program provided by NIST to perform a calbration that involves a series of interdependent comparisons. Troemner's primary standards are used for this calibration procedure. The calibration provides a high level of confidence that the measurements are in statistical control. This multi-page report od mass values is very detailed and includes statistical analysis including all measurement results, uncertainty calculations, as well as F and t test values. This certificate also includes Density Determination and Magnetic Susceptibility Determination Calibrations.
- NVLAP Accredited Primary Reference Certificate - This certificate is available for one-piece weights in ANSI/ASTM E617 Class 000, 00, 0 and OIML R 111 Class E0, E1, and E2, and contains all of the same information as the standard NVLAP Accredited Certificate as well as the Density Determination and Magnetic Susceptibility Determination Calibrations. Troemner's secondary standards are used for this calibration procedure.
Accredited Certificate (view
sample of certificate) - The NVLAP* Accredited Certificate provides compliance in both measurement process and data reported to the customer to meet a variety of standards including NVLAP Handbook
150-2, ISO/IEC 9000, ISO/IEC 17025, FDA, GMP, GLP, DOD,
ANSI/NCSL Z540-1, and nuclear requirements. Troemner’s NVLAP Laboratory Code is 105013-0. The NIST administered National Voluntary Laboratory Accreditation Program (NVLAP*) approves, through periodic audits, all processing and weighing procedures, as well as certificate format and content. Calibration procedures vary by tolerance class requested. For example, for higher accuracy classes such as Troemner UltraClass Series, ANSI/ASTM Class 000, 00, 0, and 1, OIML Class E0*, E1, E2, and F1, Troemner performs a multiple weighing procedure utilizing our secondary working standards
to determine the mass of a customer’s weight.
Accredited Certificate (view
sample of certificate) - UKAS** Weight Calibration meets the requirements of the United Kingdom Accreditation Service which encompass ISO/IEC 17025, and EN450001 requirements. Troemner is a UKAS** Accredited Calibration Laboratory Number 0516.
UKAS** approves, through periodic audits, all processing and weighing procedures, as well as certificate format and content. Calibration procedures vary by tolerance class requested. The contents of the UKAS** Accredited Certificate of Calibration are the same as the contents of the NVLAP* Accredited Calibration Certificate.
Accredited Density Determination Calibration for Weights and Mass Standards
sample of certificate) - Troemner’s mass metrology laboratory can determine the actual density of one-piece mass standards that range in size from 1 g through 5 kg. Troemner is the only private NIST/
NVLAP+ accredited laboratory in the United States for this mass calibration service. Troemner provides this service to reduce the uncertainty of calibrating one-piece precision
ANSI/ASTM Class 000, 00, and 0 and OIML Class E0*, E1,
and E2 weights. The process is highly recommended for one-piece weights used as reference standards. Utilizing a balance, a series of measurements are compared to a NIST traceable density standard immersed in water to determine the density value. The data found in this certificate will enable you to make the proper buoyancy corrections when performing calibrations on other weights. This certificate provides you with the information you need for working in true mass. Density Determination Calibration is also included in the NVLAP* Accredited Mass Code Report of Mass Values and the NVLAP* 23 Accredited Primary Reference Certificate.
Accredited Magnetic Susceptibility Determination Calibration for Weights
and Mass Standards (view
sample of certificate) - Troemner has the capability of measuring the magnetic field intensity and the potential magnetic susceptibility of stainless steel one-piece mass standards sized 1 g through 10 kg. Troemner is the only private accredited laboratory in the world for this mass calibration service. This process is recommended for one-piece weights used as reference standards to demonstrate the weights meet the required specifications for magnetism. Magnetic Susceptibility Determination Calibration is also included in the NVLAP* Accredited Mass Code Report of Mass Values and the NVLAP* Accredited Primary Reference Certificate.
Calibration Laboratories can also provide the following certificates
with our calibration service.
Weight Certificate - (view
sample of certificate) - The Traceable Certificate is designed for those laboratories and
companies that require traceability, but do not need to meet any stringent regulatory requirements. The Traceable Certificate measurement process is based on a single standard and utilizes one series of comparisons.
- Statement of Accuracy - (view
sample of certificate) - Every Troemner Weight and Weight Set, with the exception of
Economical Stainless Steel, Stainless Steel Test Weights and Cast Iron Weights, where a certificate is not ordered, is supplied with a Statement of Accuracy. This statement guarantees that the product has been manufactured to meet the tolerance specifications for its class.Note: The Statement of Accuracy Does Not Provide Traceability and is Not Suitable for Quality or Regulatory Requirements.
The following table provides a comparison of the various weight calibrations and certificates available:
* NVLAP Laboratory Code 105013-0
** A UKAS Accredited Calibration Laboratory No. 0516
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Calibration Reminders: Troemner routinely sends out calibration reminders to assure your devices are monitored properly
Did you know that the
biggest pure-gold nugget
was found in Australia
in 1869 and weighed