freetown
Electrical
- Mar 1, 2024
- 15
Hi all,
I have few questions, would like to understand about thermocouple sensors working:
1- We have some thermoucouple sensors (type T), the distance between sensors and transmitters is about 200m. As the thermoucouple output is few millivolts, is this distance can causes drop voltage and then has an effect on thermocouple's accuracy?
2- What happens if somebody reverses the polarity of a T thermocouple? Will we still have accurate value? It happens once on one sensor and we have 4 thermocouple in almsot the same area. We noticed that the reversed one is only 4 or 5 degree higher than the rest, what is the explanation for that?
3- We use dry-well to calibrate PT100 and thermocouple sensors. When we find a difference between the indication and the value of calibration (let's say dry-well is 60 degree and indication of sensor is 50) and the calibration of transmitter is ok, is the only solution in this case is to replace the sensor as we have no way to adjust sensor internally?
Thank you.
I have few questions, would like to understand about thermocouple sensors working:
1- We have some thermoucouple sensors (type T), the distance between sensors and transmitters is about 200m. As the thermoucouple output is few millivolts, is this distance can causes drop voltage and then has an effect on thermocouple's accuracy?
2- What happens if somebody reverses the polarity of a T thermocouple? Will we still have accurate value? It happens once on one sensor and we have 4 thermocouple in almsot the same area. We noticed that the reversed one is only 4 or 5 degree higher than the rest, what is the explanation for that?
3- We use dry-well to calibrate PT100 and thermocouple sensors. When we find a difference between the indication and the value of calibration (let's say dry-well is 60 degree and indication of sensor is 50) and the calibration of transmitter is ok, is the only solution in this case is to replace the sensor as we have no way to adjust sensor internally?
Thank you.