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Troubleshooting Thermocouple Sensors or Probes
All thermocouple sensors have some resistance when they are
new and the resistance increases over time as the thermocouple
element ages. Contamination or corrosion of the sensor or the
at the terminal block can also add resistance. Knowing the
resistance of the sensor and wiring of the thermocouple may be
used as a preventive maintenance tool allowing you to replace
thermocouple sensors before they fail.
Double click the
e
DIAL KNOB at any time the unit is set to
READ T/C
and then turn the
e
DIAL KNOB to move to the
second menu page so the word
T/C DISPLAY
appears at the
top of the menu. Turn the
e
DIAL KNOB to move through the
menu until the cursor is pointing at TC PROBE Ω. Press the
e
DIAL KNOB to toggle TC PROBE Ω ON.
Connect the PIE 525Plus to the inputs of the device being
calibrated using the proper type of thermocouple wire via the
miniature thermocouple socket or you may use copper wire
plugged into jacks 1 & 2.
If no sensor is connected, a wire is broken or the sensor is burned
out, OPEN TC will appear on the display. Signals above the
maximum scale are limited by protection circuitry with “OVER
RANGE” on the display.
Note: The measurement of thermocouple resistance is not a
precise reading but is a general indication of the condition of the
thermocouple sensor and connections.
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