K Thermocouple Calibration

Connect the calibration voltage source to the logger observing the correct polarity
Set the calibration source to 0.0 mV
Enter 0 in to the box labeled First Point Actual Value
Note: If you are using °F enter 32 instead of 0
Click the First Point Button
Set the calibration source to 41.27 mV
Enter 1000 in to the box labeled Second Point Actual Value
Note: If you are using °F enter 1832 instead of 1000
Click the Second Point Button
The Calibration Offset and Calibration Gain figures will now be calculated and shown on the calibration screen.
These Offset and Gain figures should now be written to the logger
Click the Write Unit, Scaling and Calibration Values to logger button
The Calibration process is now complete

Go to the Realtime screen
Set the calibration source to 0.0 mV
The K Thermocouple gauge on the Realtime screen should show the ambient temperature (Ambient Temperature plus 0°C)
Set the calibration source to 41.27 mV
The K Thermocouple gauge on the Realtime screen should show Ambient Temperature plus 1000°C

a K thermocouple junction gives 0.0mV when the thermocouple and the logger are at the same temperature.
It will give 41.27mV when there is a 1000degC difference between the logger and the thermocouple.

Connect the K thermocouple sensor to the logger
Allow the K thermocouple sensor to stabilize at the first known (lower) temperature
Read the Ambient Temperature of the Logger using the Realtime Screen
Enter the first known temperature MINUS THE AMBIENT TEMPERATURE in to the box labeled First Point Actual Value
Click the First Point Button
Allow the K thermocouple sensor to stabilize at the second known temperature
Read the Ambient Temperature of the Logger using the Realtime Screen
Enter the second known temperature MINUS THE AMBIENT TEMPERATURE in to the box labeled Second Point Actual Value
Click the Second Point Button
The Calibration Offset and Calibration Gain figures will now be calculated and shown on the calibration screen.
These Offset and Gain figures should now be written to the logger
Click the Write Unit, Scaling and Calibration Values to logger button
The Calibration process is now complete

If this procedure is used the K Thermocouple will show the correct temperature when sitting in free air.

If the ambient temperature is not subtracted from the known temperatures the K thermocouple will read high by the amount of the ambient temperature.

Connect the K thermocouple sensor to the logger
Allow the K thermocouple sensor to stabilize at the first known (lower) temperature
Read the Ambient Temperature of the Logger using the Realtime Screen
Enter the first known temperature MINUS THE AMBIENT TEMPERATURE PLUS 32 °F in to the box labeled First Point Actual Value
Click the First Point Button
Allow the K thermocouple sensor to stabilize at the second known temperature
Read the Ambient Temperature of the Logger using the Realtime Screen
Enter the second known temperature MINUS THE AMBIENT TEMPERATURE PLUS 32 °F in to the box labeled Second Point Actual Value
Click the Second Point Button
The Calibration Offset and Calibration Gain figures will now be calculated and shown on the calibration screen.
These Offset and Gain figures should now be written to the logger
Click the Write Unit, Scaling and Calibration Values to logger button
The Calibration process is now complete

If this procedure is used the K Thermocouple will show the correct temperature when sitting in free air.

If the ambient temperature is not subtracted from the known temperatures the K thermocouple will read high by the amount of the ambient temperature.

100degC = -3.553mV

-50degC = -1.889mV

0degC = 0mV

50degC = 2.002mV

100degC = 4.095mV

150degC = 6.135mV

200degC = 8.137mV

250degC = 10.151mV

300degC = 12.207mV

350degC = 14.292mV