Aoip 670 Standard Platinum Resistance Thermometers

The 670 Family consists of quartz sheath (recommended) and metal sheath models with Ro of 25.5 ?.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 resistance 25.5 ? or 100 ? Resistance ratio Wga > 1.11807 as required by ITS-90 Sensitivity 0.1 ? /°C (25.5 ?) 0.4 ? /°C (100 ?) Long term drift From 0.001°C / year depending on use Models 25.5 ? Reference Temperature range Sheath Diameter Length Sensing length Standard Notes 670SQ/25/480 -200 to 670°C Quartz 7.5 mm 480 mm 35 mm ITS-90 Recommended for wide range use in the Primary laboratory 670SQ/25/650 -200 to 670°C Quartz 7.5 mm 650 mm 35 mm ITS-90 670SL/25/480 -200 to 165°C Metal 6 mm 480 mm 35 mm ITS-90 Metal sheathed low temperature model 670/SH/25/480 -80 to 670°C Metal 6 mm 480 mm 35 mm ITS-90 Metal sheathed high temperature model 670/SH/25/650 -80 to 670°C Metal 6 mm 650 mm 35 mm ITS-90 Typical uncertainties of 670 SPRTs with UKAS calibration Fixed point °C Gamme 1 Gamme 2 Gamme 3 Gamme 4 Gamme 5 Gamme 6 TP Argon -189.3442 0,5 mK 0,5 mK 0,5 mK 0,5 mK 0,5 mK TP Mercury -38.8344 0,3 mK 0,3 mK 0,3 mK 0,3 mK 0,3 mK 0,3 mK TP Water 0.01 0,1 mK 0,1 mK 0,1 mK 0,1 mK 0,1 mK 0,1 mK MP Gallium 29.7646 0,2 mK FP Indium 156.5985 1 mK 1 mK FP Tin 231.928 1 mK 1 mK 1 mK FP Zinc 419.527 1.2 mK 1.2 mK FP Aluminium 660.323 2 mK