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

*PTC Metrology™ Test Equipment*
PTC Metrology™ is Accredited by A2LA to ISO/IEC 17025 and ANSI/NCSL Z540-1. Our metrology services include certification services for Thermometers, Surface, Air, Immersion Digital, Bimetal , Stem, Liquid-in-Glass, PRT's, Thermistors, Digital Readouts, Thermocouples, Chart Recorders, Data Loggers, Pressure Gauges and Pressure Loggers. Many quality assurance systems require that calibrated or certified thermometers be used where accurate measurements are of importance. PTC has calibrated thermometers for over 60 years and now offers certifications accredited by A2LA (cert no. 1896.01) to ISO 17025. Click on the link to view our scope of our accreditation.
*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. *Test Equipment* In temperature calibration, PTC has chosen primarily products from Hart Scientific, which supplies most national and international standards labs with calibration equipment.
*Temperature Standards* The Hart Scientific Super Thermometer 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. Hart Model 5628 s/n 0313 Hart Model 5628 s/n 0288 Hart Model 5621 s/n 748500 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 to -196°C Stirred Bath Hart 7080 -85°C to 0°CStirred 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 2x Black Body Wide Range for IR 20°C to 1200°C Standard Resistors Tinsley 100 ohm 2x Tinsley 1 ohm Tinsley 10K ohm Thomas (L&N) 1 ohm Leeds & Northrup 10 ohm Leeds & Northrup 400 ohm Hart 25 ohm Misc Temperature Lab Equipment Fluke Giga Ohm Meter Fluke Multimeter Omega TC Calibrator Polariscope for LIG Strain Checking Gartner Long Range Magnifier for Reading LIG Hart Model 7132 TPW Maintenance Freezer
Durometer Standards 100X comparator overlays Gage Blocks Tovey Load Cell and Readout Durocalibrator	Pressure Standards Ruska 2400 HL Primary Deadweight Tester 50ppm Ruska 2465 Primary Deadweight Tester 50ppm Ruska 2470 Primary Deadweight Tester 50ppm 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™*