Issue
Resistance against temperature
Product Line
Field Devices
Environment
- TC300 thermostat range
- TC900 thermostat range
- RS-03 remote sensor
Cause
Remote sensor compatibility
Resolution
The TC thermostat range use a 10K type 3 (3950) Negative Temperature Coefficient (NTC) thermistor. Whilst this is similar to the 10K type 3 thermistor used in the other BMS field device sensors such as the SpaceLogic SLA range, it has a different resistance curve and the temperature read will be different.
The table below shows that at typical room temperatures the error is 0.6°C or less.
| T(°C) | RS-03 R(KΩ) | SPA R(KΩ) | Error % | Error °C |
| 0 | 31.77 | 29.575 | 6.91% | 1.736 |
| 5 | 24.94 | 23.504 | 5.76% | 1.366 |
| 10 | 19.68 | 18.809 | 4.43% | 1.052 |
| 15 | 15.62 | 15.146 | 3.03% | 0.812 |
| 20 | 12.47 | 12.271 | 1.60% | 0.63 |
| 25 | 10 | 10 | 0.00% | 0 |
| 30 | 8.064 | 8.195 | -1.62% | 0.3872 |
| 35 | 6.538 | 6.752 | -3.27% | 0.3052 |
| 40 | 5.327 | 5.592 | -4.97% | 0.2422 |
| 45 | 4.363 | 4.655 | -6.69% | 0.1928 |
| 50 | 3.592 | 3.893 | -8.38% | 0.1542 |
Click here to view the TC thermostat's RS-03 remote temperature against resistance chart.
Click here to download the chart that provides the temperature against resistance reading for the TC thermostat's RS-03 remote temperature sensors.
