Issue
Certain Xenta controllers and I/O modules can accept 1.8k thermistor temperature inputs.
Product Line
TAC VistaEnvironment
- Xenta 121-FC
- Xenta 200
- Xenta 300
- Xenta 420A
- Xenta 450A
Cause
What is the temperature vs resistance curve of the 1.8k thermistors for Xenta 300?
Resolution
- All Xenta controllers and I/O modules, except the Xenta 102-AX use the same 1.8k thermistor (type 1.8KA1).
- The following table shows details the Temperature vs. Resistance characteristics for this thermistor.
| Temp (°C) | Minimum kΩ | Nominal kΩ | Maximum kΩ |
| -50.0 | 60.87 | 63.88 | 67.03 |
| -45.0 | 45.41 | 47.5 | 49.68 |
| -40.0 | 34.23 | 35.68 | 37.2 |
| -35.0 | 26.04 | 27.07 | 28.13 |
| -30.0 | 19.99 | 20.72 | 21.47 |
| -25.0 | 15.48 | 16.0 | 16.54 |
| -20.0 | 12.09 | 12.46 | 12.84 |
| -15.0 | 9.512 | 9.779 | 10.05 |
| -10.0 | 7.541 | 7.733 | 7.929 |
| -5.0 | 6.021 | 6.16 | 6.301 |
| 0.0 | 4.84 | 4.94 | 5.042 |
| 5.0 | 3.916 | 3.988 | 4.061 |
| 10.0 | 3.189 | 3.24 | 3.293 |
| 15.0 | 2.612 | 2.649 | 2.686 |
| 20.0 | 2.151 | 2.177 | 2.209 |
| 25.0 | 1.782 | 1.8 | 1.818 |
| 30.0 | 1.478 | 1.496 | 1.514 |
| 35.0 | 1.233 | 1.25 | 1.267 |
| 40.0 | 1.033 | 1.049 | 1.065 |
| 45.0 | 0.8698 | 0.8848 | 0.9001 |
| 50.0 | 0.7357 | 0.7497 | 0.7639 |
| 55.0 | 0.6251 | 0.638 | 0.6511 |
| 60.0 | 0.5334 | 0.5453 | 0.5573 |
| 65.0 | 0.457 | 0.4679 | 0.479 |
| 70.0 | 0.3931 | 0.4031 | 0.4132 |
| 75.0 | 0.3395 | 0.3485 | 0.3578 |
| 80.0 | 0.2942 | 0.3025 | 0.311 |
| 85.0 | 0.2559 | 0.2634 | 0.2712 |
| 90.0 | 0.2233 | 0.2302 | 0.2373 |
| 95.0 | 0.1956 | 0.2019 | 0.2083 |
| 100.0 | 0.1718 | 0.1775 | 0.1835 |
| 105.0 | 0.1514 | 0.1566 | 0.1621 |
| 110.0 | 0.1338 | 0.1386 | 0.1436 |
| 115.0 | 0.1186 | 0.123 | 0.1276 |
| 120.0 | 0.1054 | 0.1095 | 0.1136 |
| 125.0 | 0.094 | 0.0977 | 0.1015 |
| 130.0 | 0.084 | 0.0874 | 0.0909 |
| 135.0 | 0.0753 | 0.0784 | 0.0816 |
| 140.0 | 0.0676 | 0.0705 | 0.0735 |
| 145.0 | 0.0609 | 0.0635 | 0.0663 |
| 150.0 | 0.0549 | 0.0574 | 0.0599 |
