This FAQ applies to both LPTM-1 and PL-TW thermocouple data loggers.
If the thermocouple readings appear incorrect, follow the steps below.
1. Verify the Thermocouple Type
First, confirm the type of thermocouple connected to the data logger.
Then make sure the correct thermocouple equation is selected for that channel in SiteView.
For example:
- Type E thermocouple → select the TypeE equation
- Type J thermocouple → select the TypeJ equation
- Type K thermocouple → select the TypeK equation
Using the wrong thermocouple equation will result in incorrect temperature readings.
2. Check the Data Logger Input
If the correct thermocouple equation is already selected and the reading is still incorrect, check whether the problem is caused by the thermocouple or by the data logger input.
- Disconnect the thermocouple probe from the affected channel.
- Use a short piece of wire to connect the affected channel input to COM/GND.
- Change the equation for that channel to:
VoltageDC
- Check the voltage reading for that channel.
The reading should normally be between:
-50 µV and +50 µV
You may need to adjust the Voltage unit settings in SiteView so the reading is displayed in µV.
3. Evaluate the Result
If the reading is within ±50 µV, the data logger input is operating normally.
In this case, check the thermocouple probe, wiring, and connections. Replace the thermocouple if necessary.
If the reading is outside the ±50 µV range, please contact Microedge for further assistance.