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Silver Point Thermometer, Model 96178, Aspirated HTSPRT
Isotech, Aspirated HTSPRT, Silver Point Thermometer
Superior silver-point thermometer
0C to 1000C (1832F)
  • Resistance Value: Ro = 0.25Ω
  • Reistance Ratio: Wga>1.00807
  • Valve for air exchange
  • Heat radiation shield constructed with ultra-pure quartz


   Product Description    Specifications Videos
Isotech has produced over 200 high-temperature thermometers, which have been sold world-wide for use up to the silver point. As a consequence of our pre-delivery SPRT thermometer testing alone, we have probably made more silver point calibrations than anyone else in the world.

No one fully appreciates all the mechanisms at work when a coil of pure platinum wire inside a quartz envelope is taken to 1000C and back. However, endless hours of study at National and International levels, plus our own significant work at Isotech, have enabled us to design, build and test a superior Silver-Point Thermometer. This high-temperature thermometer is a significant contribution to better high-temperature calibration.

First, the 96178 can breathe. A valve in the handle of this aspirated thermometer can be opened to allow depleted oxygen or moist air to escape, and fresh air containing 20% oxygen to replace it. The valve is normally opened at elevated temperatures and closed to prevent moisture ingress before water triple point measurements are performed.

Second, the 96178 is the only high temperature thermometer ever designed with platinum heat radiation shields built into the sheath, to prevent heat radiating up inside the sheath.

Third, a new, ultra-pure quartz, developed for the semiconductor industry at a cost of between 20 and 30 million pounds, has been adopted for use in the construction of the 96178. This new SPRT thermometer exemplifies our commitment to achieve the highest possible quality and minimum of contamination.

How this aspirated thermometer is handled is most important for its stability, and a purchaser will receive a comprehensive manual and tutorial with each 96178.

Under some circumstances, provided the interior of the thermometer is undamaged, we can replace the outer quartz sheath. Please consult us if a replacement is required.

To fully exploit the accuracy of the 96178, a user will need a furnace for warming and annealing the thermometer, as well as one to house the silver-point/aluminium-point cells.

A Dual Calibration Furnace from Isotech combines these two features with all the special accessories and handling know-how we have discovered.
96178 Silver-Point Thermometer Product Spec Sheet 96178 Manual