670

picto fleche Standard Platinum Resistance Thermometers 25.5 Ω, primary lab, -200°C to 670°C

The 670 Family consists of quartz sheath (recommended) and metal sheath models with Ro of 25.5 Ω.

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The 670 Family consists of quartz sheath (recommended) and metal sheath models with Ro of 25.5 Ω.

The 670SQ is our latest thermometer, to be specifically designed to give optimum performance up to the Aluminium 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 sheath gives the most stable performance with minimal drift, and a unique platinum radiation shield prevents heat radiating up the inside of the sheath.

The 670SQ can be supplied with RTPW and Wga only or with full UKAS calibration. “With calibration” means that you will get an ITS-90 accepted Fixed Point calibration. For best accuracy, the recommended maximum measuring current for the 670SQ is 1 mA.

The 670SQ 650 mm long is our recommended SPRT offering ultra stability, vibration, shock, immersion (recommended sufficient immersion: 270 mm) and self heating characteristics.

General specifications

Measuring range-200°C to 670°C
Nominal resistance25.5 Ω or 100 Ω
Resistance ratioWga > 1.11807 as required by ITS-90
Sensitivity0.1 Ω /°C (25.5 Ω)
0.4 Ω /°C (100 Ω)
Long term driftFrom 0.001°C / year depending on use

Models 25.5 Ω

ReferenceTemperature rangeSheathDiameterLengthSensing lengthStandardNotes
670SQ/25/480-200 to 670°CQuartz7.5 mm480 mm35 mmITS-90Recommended for wide range use in the Primary laboratory
670SQ/25/650-200 to 670°CQuartz7.5 mm650 mm35 mmITS-90
670SL/25/480-200 to 165°CMetal6 mm480 mm35 mmITS-90Metal sheathed low temperature model
670/SH/25/480-80 to 670°CMetal6 mm480 mm35 mmITS-90Metal sheathed high temperature model
670/SH/25/650-80 to 670°CMetal6 mm650 mm35 mmITS-90

Typical uncertainties of 670 SPRTs with UKAS calibration

Fixed point°CGamme 1Gamme 2Gamme 3Gamme 4Gamme 5Gamme 6
TP Argon-189.34420,5 mK0,5 mK0,5 mK0,5 mK0,5 mK
TP Mercury-38.83440,3 mK0,3 mK0,3 mK0,3 mK0,3 mK0,3 mK
TP Water0.010,1 mK0,1 mK0,1 mK0,1 mK0,1 mK0,1 mK
MP Gallium29.76460,2 mK
FP Indium156.59851 mK1 mK
FP Tin231.9281 mK1 mK1 mK
FP Zinc419.5271.2 mK1.2 mK
FP Aluminium660.3232 mK

 

670                       Standard Platinum Resistance Thermometers, SPRTs, Primary laboratory, -200°C to 670°C

Delivered in standard with:

  • Traceable certificate at Water Triple Point and Melting Point of Gallium
  • Carrying case

Models 25.5 Ω

ReferenceTemperature rangeSheathDiameterLengthSensing lengthStandard
670SQ/25/480-200 to 670°CQuartz7.5 mm480 mm35 mmITS-90
670SQ/25/650-200 to 670°CQuartz7.5 mm650 mm35 mmITS-90
670SL/25/480-200 to 165°CMetal6 mm480 mm35 mmITS-90
670/SH/25/480-80 to 670°CMetal6 mm480 mm35 mmITS-90
670/SH/25/650-80 to 670°CMetal6 mm650 mm35 mmITS-90