May I ask if thermocouples can be used for online measurement?
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To determine whether a thermocouple is functioning properly, one usually uses a multimeter to measure the two wires of the thermocouple. Is it possible to conduct the measurement directly on the wires themselves?
This post was last edited by qugd on 2017-3-28 09:55. Most thermocouples used in industry have their open-circuit or short-circuit conditions monitored online, and some intelligent transmitters can even provide diagnostic signals directly. To measure the millivolt value of a thermocouple, it is best to use a potentiometer or a millivolt meter, as the accuracy and stability of a multimeter are not sufficient for measuring thermocouple signals. Sometimes, even by connecting a resistor to a multimeter, readings of a few to a dozen millivolts can be displayed; such false readings from a multimeter can affect the actual millivolt signal from the thermocouple.
The signal from the thermocouple is in millivolt voltage, and it can be measured online
Will a regular multimeter work? Measure the voltage of the two wires directly?
Get a multimeter, measure the millivolt value, and check the table – that’s all
You can use a thermocouple to calibrate the simulator; this way, you can immediately determine whether the thermocouple is good or not
Yes, you can use a multimeter to make the measurement directly
For a thermocouple with an S rating, at 1000 degrees it will read just over 9 millivolts, and it’s a bit difficult to measure this with a multimeter
Yes, simply measure the voltage and then consult the thermocouple millivolt value chart to determine the temperature.