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SPRT (Standard Platinum Resistance Thermometer), Model 670
Isotech, Model 670, Primary SPRT
 
Our Best Standard Platinum Resistance Thermometer

-200ºC to 670ºC (1238ºF)
  • Resistance Value (0ºC): 25.5 Ω
  • Resistance Ratio: WGA>1.11807 as required by ITS-90
  • Sensitivity: 0.1Ω/ºC
  • Long term drift from 0.001ºC/year
  • Calibration (UKAS or NIST): By Fixed Point through W4 & W7 subranges

Product Code: 670
 

   Product Description
 
  • OVERVIEW
  • SPECIFICATIONS
  • DOWNLOADS

Standard Platinum Resistance Thermometer (SPRT)

Primary SPRT - Isotech Model 670

This is the first new thermometer, after the introduction of ITS-90, to be specifically designed to give optimum performance up to the aluminum point. Its construction permits the four internal platinum lead wires to expand and contract in the same manner as those of silver-point thermometers. The all-quartz construction of the support-members gives the most stable performance with minimal drift, and a unique platinum radiation shield prevents heat radiating up the inside of the sheath. The temperature range and design of this new unit means that we offer 25.5 Ω (Ro). The construction, including the coiled sensing element, heat-shunt baffles and light scattering barriers, creates a thermometer of unsurpassed stability. Because the 670 goes beyond the temperature range of oxide growth to the level at which the oxide dissociates, the 670 is filled conventionally with argon containing 10% oxygen.

A 2-metre length of low thermal emf, high temperature, screened cable is connected in the handle, via a strain-relieving transition, to the all pure-platinum construction of the thermometer. Gold-plated U-shaped terminals complete the cable construction, and the 670 is delivered in an elegant soft lined carry-case of our own design.

A 670 is delivered only after a stabilizing process which is complete when the reproducibility of RTPW is within 0.0005°C after excursions to the extremes of its temperature range. Values of RTPW and WGA are routinely provided with the 670.

The 670 can be supplied with RTPW and WGA only or with full NIST Traceable or UKAS Accredited calibration.

A comprehensive handbook and tutorial will help you get the very best performance and stability from your 670.


Model Range (ºC) RO (Ohms) Sheath Diameter Sensing Length Comments
670SQ -200 to 670 25.5 Quartz 7.5mm 650mm or 480mm 35mm Recommended for wide range use in the Primary Laboratory
670SQ -200 to 550 100 Quartz 7.5mm 650mm or 480mm 35mm 100 Ohm version
670SH -80 to 670 25.5 Metal 6mm 650mm or 480mm 35mm Metal sheathed high temperature model
670SH -80 to 550 100 Metal 6mm 650mm or 480mm 35mm 100 Ohm version
670SL -200 to 165 25.5 Metal 6mm 480mm 35mm Metal sheathed low temperature model
Literature

670 Datasheet 670 SQ Manual 670 SH & SL Manual
670 SPRT Datasheet 670 SQ SPRT Manual 670 SH & SL SPRT Manual

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