PTC Metrology Temperature Traceability and Laboratory Test Equipment NIST Traceable and A2LA, Accredited Certifications

Calibration Lab Equipment

PTC Metrology uses NIST Traceable Standards for Certification and Calibration of Temperature Devices, PRT's, RTD's Thermocouples, Probes, Thermistors, Semi-Submersible instruments, Data Loggers, Digital or Analog Stem Thermometers.

PTC Metrology® accredited by A2LA to ISO/IEC 17025 and ANSI/NCSL Z540-1. Certifications are NIST traceable and will include; as received and as returned data; a statement of uncertainty; laboratory conditions; and information on the primary standards. To assist you in choosing test points please refer to ASTM E-77 and NIST recommendations.

Ensuring NIST Traceability

Traceability is defined as " the property of a result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons all having stated uncertainties". Traceability ensures that the measurements are accurate representations of the specific quantity subject to measurement, within the uncertainty of the measurement. To ensure traceability, suitably calibrated standards that are appropriately maintained and cared for, proper standard operating procedures, continuous measurement control, surveillance, and suitable documentation must all be present.

Test numbers issued by NIST should not be used nor required as proof of the adequacy or traceability of a test measurement. Having a NIST number does not provide evidence that the measurement value provided by another organization is traceable.

Traceability can be characterized by the following elements. An unbroken chain of comparisons, measurement uncertainty and documentation.

A2LA Policy on the use of NIST Test Report Numbers as Evidence of Traceability

http://www.a2la.org/press_releases/PR7799PolicyNIST.htm

Test Equipment

In temperature calibration, PTC has chosen primarily products from Hart Scientific,
which supplies most national and international standards labs with calibration equipment.

Primary Standards

The Hart Scientific Super Thermometer 1575A is center stage along with several SPRT's featuring calibration traceable to the fixed points of the ITS-90 temperature scale and NIST.

The 1575A makes precision resistance ratio measurements to determine temperature with an uncertainty of ±0.002°C or less. SPRTs and PRTs generally require temperature to be calculated according to the International Temperature Scale of 1990 (ITS-90) by applying coefficients unique to the SPRT or PRT. The 1575 does these calculations automatically. The sensor coefficients are entered into the 1575 by the user and stored in non-volatile memory. Temperature is calculated in any of a variety of units including degrees Celsius (°C), degrees Fahrenheit (°F), or Kelvin (K). Once the temperature reading is obtained it is sent to the display, stored in memory, and, if necessary, written to disk or any of the output ports.

SPRT (Hart 5699) featuring calibration traceable to the fixed points of the ITS-90 temperature scale.

High Temperature Hart 5624 PRT to 1000°C
SPRT (Rosemount 162CE) (two)
TPW Hart 5901A 0.01°C (two)

A water triple point cell (0.01°C ± 0.0001) is used to correct any drift that the SPRT may experience on an ongoing basis.

Secondary Standards (working standards)

Hart Model 5628 s/n 0313
Hart Model 5628 s/n 0288
Hart Model 5621 s/n 748500

Precision Readouts

Hart Model 1575A Super Thermometer SPRT, PRT, Thermistor
Black Stack - Precision Readout for Thermocouples s/n 2565
Black Stack - Precision Readout for SPRT and PRT s/n 2560

Temperature Sources

Liquid Nitrogen Comparator -At the low temperatures a liquid nitrogen comparator is used at -196°C

Stirred Bath (ULT80) -75°C to 0°C
Stirred Bath (Hart 7025) -20°C to 30°C
Resistor Bath (Hart 7025) 25°C
Stirred Bath (Hart 7030) -20°C to 100°C with level adapter
Stirred Bath (Hart 6022) 50°C to 278°C with level adapter
Stirred Bath (Hart 6020) 50°C to 300°C
Comparator (Hart 9260) 275°C to 680°C
Comparator (Hart 9112 deep well ) 600°C to 1100°C
Comparator TC Furnace (Hart 9150 ) 600°C to 1200°C
Comparator (Hart 9150 ) 600°C to 1200°C
Surface Calibrator (Hart 3125) 35°C to 400°C
Black Body Wide Range for IR 20°C to 1200°C

Standard Resistors

Tinsley 100 ohm
Tinsley 1 ohm
Tinsley 10K ohm
Thomas (L&N) 1 ohm
Leeds & Northrup 10 ohm
Leeds & Northrup 1000 ohm
Leeds & Northrup 100k ohm

Misc Lab Equipment

Megger Giga Ohm Meter
HP Multimeter
Omega TC Calibrator
Polariscope for LIG Strain Checking
Questar Long Range Microscope for Reading LIG
Gartner Long Range Magnifier for Reading LIG
Hart Model 7132 TPW Maintenance Freezer

Pressure Primary Standards

Ruska 2400 HL Primary Deadweight Tester
Ruska 2465 Primary Deadweight Tester
Ruska 2470 Primary Deadweight Tester

Pressure Secondary Standards

Pressurements Deadweight Tester m2200/3
10 to 10,000 psi Hydraulic
Ametek HK-1000 Pneumatic to 1000 psi

Recall Notification

PTC Metrology® will notify you by email when your instrument is due for recalibration, in accordance with the period of validity that your quality system specifies. Please register your instrument today.

A2LA Scope of Accreditation PTC Metrology