The length of a thermocouple has no effect on its measurement accuracy or its ability to transfer the signal to the instrument. In other words, thermocouples
do not experience "voltage drops" or power loss along its length as a high current power line might possess. The reason for this is due to the very low current
and voltages associated with temperature measurements and that the thermocouple wire becomes the voltage source. In reality the sensor can be inches or thousands
of feet long and the accuracy will not be affected. In practical applications where the thermocouple is a substantial distance from the instrument, electrical
noise can be induced and the sensor selected should be shielded and grounded at one end. In severe environments, or when the distance is in excess of 150 feet,
a 4-20mA signal conditioner is suggested.
1) What do thermocouple letter designations mean?
2) What are thermocouple color codes?
3) What letter of calibration should I use?
4) What is the initial accuracy of temperature sensors?
5) Is there a maximum length for thermocouples and thermocouple wiring?
6) What sheath material is the best for my application?
7) What are the maximum temperatures of thermocouples?
8) What type of junction should I use?
9) What is the response time of mineral insulated thermocouples?
10) Where should my sensor be placed?
11) What should the thermocouple resistance measure?
12) The sensor appears to be reading incorrectly. What might be wrong? |
