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Model 909-25.5 Standard Platinum Resistance Thermometer. Temperature range of -196°C to 670°C
Model 909-100 Standard Platinum Resistance Thermometer. Temperature range of -196°C to 550°C.
The wide range of our Model 909 means that the associated uncertainties are slightly larger than those of
the new models developed from it.

Platinum Resistance Thermometer.

Model  Description 
909-25.5 Standard PRT Thermometer Range -196°C to 670°C
909-100 Standard PRT Thermometer Range -196°C to 550°C
The resistance element is of pure platinum, coiled and mounted in a strain free construction.
The former is of pure alumina material and all parts have been pre-aged to eliminate
contamination and strain.
All joints are welded to minimize resistance changes. The leads are brought to a handle assembly
where they are connected to a low loss cable, 6 feet long and screened.
The thermometer sheath is of quartz material which is filled with dry air during construction.
Three lengths are available, standard length 480mm, extra length 550mm or maximum length 600mm.

The model 909 is supplied with a calibration certificate giving RTPW and Wga.
For transportation and storage the Model 909 is supplied in its own attractive carrying case.
Standard PRT
Model 909-25.5  909-100 
Measuring Range  -196°C to 670°C  -196°C to 550°C 
Nominal Resistance  25.5Ω at 0°C  100Ω 
Recommended
Maximum Current mA 
0.5 
Nominal Sensitivity Ω/°C  0.1  0.4 
Resistance Ratio  Wga > 1.11807 as required by ITS-90 
Self-Heating  1mK/25 microwatts 
Sealed-In Gas  Dry air 
Internal Leads  4 wire-platinum 
External Leads  Silver-plated multistrand wires in a low-loss insulation
cable terminating in gold-plated terminals. 
Length  480mm standard
550mm to order (E)
600mm to order (L) 
Nominal Diameter  7.5mm