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 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.
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 |
1 | 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 | |