Instructions to attach the calibration cap onto the sensor module to get Zero or Span values.
Step 1. Remove the Filter and prepare the calibration
cap
Step 2. Attach the calibration cap to the sensor head
Step 3. Installed the Regulator to the Gas cylinder
Step 4. Attach the tube to the regulator
With the 2-point calibration method, the user can define the A and B factors. Please find below the steps of calibration.
- Power ON the device;
- Place the device in a clean-air environment (the target value is nearly zero) at a temperature from 20 - 30 oC, in at
least 60 minutes.
- After 60 minutes, force the device to send data, read and record the Raw_value, so now you got the Zero_value =
Raw_GHC value.
NOTE: THE CALIBRATION CAN ONLY BE DONE IN THE SAFE ZONE!!!
Please select the flow regulator with a flow rate of 2.5 LPM or 5.0 LPM.
Step 1: Get the Zero value.
Recommendation: Record many Raw_GHC values at least 10 minutes apart (10 values).
Zero value is the average of the recorded Raw values.
Note: the Raw_GHC values can be positive or negative; Its value is usually 7 (%LEL)
Step 2: Get the Span value
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