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| Standard Thermometers | |
| Working SPRTs Model 909 | |
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Economically priced SPRT 25 or 100 Ohm, -196°C to 670°C |
 From Databook 2 |
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 Data Sheet |
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| This economically-priced Standard Platinum Resistance Thermometer, Model 909, is the workhorse of calibration laboratories all over the world. Our Model 909-25.5 has a range of -196°C to 670°C and the model 909-100 has a 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. 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, 2M 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. Alternatively we can provide a complete calibration certificate with our UKAS Schedule. For transportation and storage the Model 909 is supplied in its own attractive carrying case. |
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