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 Troemner is the country's largest independent commercial mass metrology
laboratory offering complete, full-time mass calibration services.
Troemner's mass calibration laboratories and processes are
ISO/IEC
17025 compliant. Troemner’s Calibration Laboratories
have the capability of providing mass calibrations from 0.050
mg to 2000 kg (0.00001 oz to 5000 lb).
Troemner
has earned dual accreditations for performing mass calibrations
from the National Institute of Standards and Technology (NIST)
-administered National Voluntary Laboratory Accreditation
Program (NVLAP)
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.
Mass Calibration Services QuickLINKS:
> Facility and Environment
> Equipment
> Staff
> Processes
> Mass Calibration Services
> Weight Recalibration Service Request for Quote/Order Form
> Calibration Devices - Alphabetical List
> Calibration Devices Listed by Service
 Facility
and Environment
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 mass calibrations by both NVLAP and UKAS
since 1995.
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.
Equipment
All mass
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.
Each mass
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
standards.
 Staff
Troemner’s
four person metrology staff has received training in mass
calibrations at NIST and has extensive experience in mass
calibration. Many of the calibration technicians have also
received training from NIST in addition to extensive in house
training.
Processes
Calibration
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
Over
the years, Troemner has used various stainless steels
in the production of our weights, including our newest
material, Alloy 8 Stainless
Steel. Below
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.
Mass
Calibration Services Include:
- Calibration
"As Found" and "As Left" calibrated
values
- Cleaning
– Foreign contaminants on weights will be removed
- Adjustment
– If weights are found to be out of tolerance, then
the weights can be adjusted (2 piece weights only)
- Detailed
certificate provided with your weights
- Fast
turnaround time
The
following services are available at extra charge:
Mass Calibration and
Certificate Options
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
Weight Calibration Certificate (view
sample of certificate) - a detailed, multi-page weight
certificate designed to meet all of your ISO (including
ISO/IEC 17025), FDA, GMP, GLP, DOD, ANSI/NCSL Z540-1, and
nuclear requirements. The NIST-administered National Voluntary
Laboratory Accreditation Program (NVLAP Lab Code 105013-0)
approves all procedures for this detailed weight certificate.
The measurement process follows the recommendations of NIST
Handbook 145.
- UKAS
Certificate of Weight Calibration
(view
sample of certificate) - similar to the NVLAP
Certificate in content and form, however, it is more widely
accepted in the European community. It meets the requirements
of the United Kingdom Accreditation Service (UKAS). This
Certificate of Weight Calibration is universally accepted
throughout the world. Troemner (UKAS International Calibration
No. 0516) is presently the only UKAS-accredited U.S. mass
metrology laboratory offering its customers this internationally
recognized Certificate of Weight Calibration. Additionally,
Troemner's UKAS accreditation fulfills the requirements
of ISO/IEC 17025 - the widely accepted standard for competence
of calibration laboratories.
- NVLAP
Density Determination Calibration for Weights and Mass Standards
(view
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 to 5 kg. Troemner
is the only private accredited laboratory in the United
States for this calibration. Troemner provides this service
to reduce the uncertainty of calibrating one-piece precision
ASTM Class 0 and OIML Class E1 and E2 weights. Utilizing
a state of the art balance immersed in a fluorinated fluid,
a series of measurements are compared to a NIST traceable
density standard to determine the density value.
- NVLAP
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 mass standards
between 1 g and 10 kg. Troemner is the only private accredited
laboratory in the United States for this calibration.
Troemner’s
Calibration Laboratories can also provide the following certificates
with our calibration service.
- Traceable
Weight Certificate - (view
sample of certificate) - designed for those laboratories
and companies that require traceability, but do not need
to meet any stringent regulatory requirements. In contrast
to NVLAP or UKAS calibration procedures, the Traceable Weight
Certificate measurement process is based on a single standard
and utilizes one series of comparisons.
- Statement of Accurcay - (view
sample of certificate) - Weights supplied without weight certificates come with Statements of Accuracy detailing the dates of calibration and density of each weight. The statement verifies that the product has been manufactured to meet all specifications for its class and has been calibrated using standards traceable to NIST.
- Troemner
MMAP Report of Mass Values - Troemner offers a detailed
statistical analysis of mass values. Troemner MMAP report
follows a carefully designed high-end calibration procedure
that compares the customer’s weights to Troemner’s
primary standards. This results in the highest possible
statistical confidence level for our customer’s weights.
The multi-page Troemner MMAP report is the same report one
would receive if weights were calibrated directly by NIST.
For additional information, please
contact Troemner.
The following table provides a comparison of the various mass calibrations and certificates available:
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