Thermocouple Amp Temperature incorrect in Analysis software ?
Posted: Sat Jul 23, 2016 8:27 pm
HI all
I am logging cylinder head temperature on an air cooled beetle engine with a K type thermocouple connected to a head stud. I am using RT's high range (-100C to +1150C) thermocouple amp. However I am getting different temperatures reported in the Analysis program versus the Dash3. It looks me, if the thermocouple amp is calibrated the way I think it is, that the Analysis program numbers are wrong.
I did a test as follows :-
- I removed my thermocouple from the cylinder head and placed it in a water I had heated in a kettle.
- Voltage measured on the sensor input to DL1 was 0.55v
- Dash3 showed temperature of 40.8deg C
- Logged data and loaded it up in Analysis
- Sensor type is correctly configured as the high range thermocouple to display in degrees C - It showed 247deg C !!!!!
- To check I went into the variable manager and told the software to display the channel as volatage - it showed 0.548v as expected
Question : What is the correct calibration function for this thermocouple amp ?
I have read elsewhere in the forum X/0.004 - 100 (where X is input voltage), which makes sense to me if output is linear - but it is clearly NOT what is programmed in to the Analysis program.
All help gratefully received.
Jimmy
I am logging cylinder head temperature on an air cooled beetle engine with a K type thermocouple connected to a head stud. I am using RT's high range (-100C to +1150C) thermocouple amp. However I am getting different temperatures reported in the Analysis program versus the Dash3. It looks me, if the thermocouple amp is calibrated the way I think it is, that the Analysis program numbers are wrong.
I did a test as follows :-
- I removed my thermocouple from the cylinder head and placed it in a water I had heated in a kettle.
- Voltage measured on the sensor input to DL1 was 0.55v
- Dash3 showed temperature of 40.8deg C
- Logged data and loaded it up in Analysis
- Sensor type is correctly configured as the high range thermocouple to display in degrees C - It showed 247deg C !!!!!
- To check I went into the variable manager and told the software to display the channel as volatage - it showed 0.548v as expected
Question : What is the correct calibration function for this thermocouple amp ?
I have read elsewhere in the forum X/0.004 - 100 (where X is input voltage), which makes sense to me if output is linear - but it is clearly NOT what is programmed in to the Analysis program.
All help gratefully received.
Jimmy