The KFD0-TT-Ex1 is a thermocouple converter
What you will want to do to fine tune this intrinsic safety barrier is as follows:
Look at these thermocouple tables. The temperature value on the left side corresponds with the mV values for each type of thermocouple.
1. Set the Span Rotary Dial to the required position. This is determined by looking at the upper mV limit for the corresponding temperature range. If your temperature range is 0-400 °C, your mV range will be 0 - 21.848 mV. Use that 21.848 mV to determine which position to set the rotary switch. In this case, you can select either position “2” or position “3” since both are in the range.
2. Set the Zero Rotary Dial to the required position. This is done by figuring out which zero point on the temperature scale they want to use. In this example, they want to go from 0-400 °C, so 0 °C is the low point, which is 0 mV. Select position “2” since the 0 mV is in that range.
3. Input 0 mV into the device with an amp meter connected.
a. Use the zero point potentiometer on the front until your amp meter reads 4 mA
4. Input whatever your max mV reading should be into the device (21.848 mV for 400 °C in this example)
a. Use the span point potentiometer on the front until your amp meter reads 20 mA
5. Repeat step 3. The reading on the amp meter may not be exactly 4 mA. Fine tune it until it is.
6. Repeat step 4. The reading on the amp meter may not be exactly 20 mA. Fine tune it until it is.
7. Keep repeating the process until every time you put 0 mV in, your amp meter reads 4 mA and every time you put in 21.848 mV, your amp meter reads 20 mA. It may take 2 or 3 cycles through for this to happen.