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Zero Calibration button
Zero Calibration
The detector signal output should be 4 mA when there is no target gas exist on the area or a
clean compressed air applied to detector. Use a multimeter to check signal output. If the
signal output is different than 4 mA, enable the zero calibration via pressing to the zero
calibration button for 10 seconds. Zero calibration switch is shown on Diagram 8. After
holding it pressed for 10 seconds, the red power LED will be solid lit meaning zero calibration
process is started. The detector automatically adjusts the output signal level to 4 mA for the
next 30 seconds, assuming the detector is in a fresh air environment. If the ambient air is not
clean, clean air cylinder should be used to give clean air to the sensor head at a constant
speed of 0.5 lt/min using the calibration head. After 30 seconds, the detector completes the
Span Calibration
zero calibration process and the power LED flashes once per second at normal speed.
Span calibration must be done by exposing the detector a known gas. In first step zero
calibration should be completed. The current level should be monitored continuously at the
detector output using a measuring instrument DMM. Then, the calibration head should be
attached to the sensor head and gas should be applied to the sensor using a regulator at a
constant flow rate of 0.5lt / min. The span calibration button shown in Diagram-8 must be
pressed for 10 seconds to start the span calibration. After holding it pressed for 10 seconds,
the red power LED will be solid lit meaning the span calibration process is started. Depending
PRS-UM-PC3-EN-Rev.04-06.2020
Span Calibration button
Diagram 10: Calibration buttons
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