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2mA analogue signal output during warm-up period and current level will be 4mA after warm-
up.
Here is the LED status table during warm-up, normal operation and fault status:
LED
Power -Red
Fault - Yellow
First Time Switch on (Commissioning)
WARNING: The following procedure requires the detector Cover to be removed while carrying
out supply voltage checks. Therefore the appropriate permits to work should be sought in
preparation. Prior to carrying out any HOT WORK ensure local and site procedures are
followed. Ensure that the associated control panel output actuation is inhibited so as to
prevent false alarms. The following procedure should be followed carefully and only
performed by suitably trained personnel
1. Remove the detector cover
2. Configure the analogue output signal and power input connections correctly
3. Check that all electrical connections are terminated correctly
4. Switch On the external power supply to feed the detector
5. Using a Digital Multi Meter (DMM), check the Supply Voltage at the terminals V+ (24V)
and V- (0V), this should be a minimum supply voltage of 12VDC (Maximum supply
voltage is 24VDC)
6. Check LED status on detector main board. Both LEDs will be illuminated right after
applying power.
7. Wait two minutes and confirm that the yellow LED turned off and only red LED blinking.
8. Switch Off the external power to the detector.
9. Fit the cover and make sure none of the cables cause an obstruction while fitting cover
Calibration
10. Switch on external power to the detector.
It is recommended to periodically carry out calibration to ensure correct operation. Detector
should be powered and stabilized for at least 4 hours before calibration. For Flammable gas
calibration use a calibration gas concentration of between 25%LEL and 75%LEL to ensure that
the required accuracy can be attained. To calibrate the detector, use an appropriate span gas
cylinder, constant flow regulator and Prosense Gas Cap. The calibration gas flow rate should
be 0.5 L/min. It is recommended to use a compressed air cylinder (20.9%Vol oxygen) to
perform the zero calibration if the area where the detector is located contains any residual
amount of the target gas. If no residual gas is present then the background air can be used to
perform the zero calibration. Calibration procedure should be completed for both zero and
span adjustment steps. Calibration switches and adjustment buttons will be used on main
board during calibration.
PRS-UM-PC3-EN-Rev.04-06.2020
Warm-up
Normal Operation
Blinking
Blinking
Blinking
Solid - Off
Table 12: LED status details
Fault Status
Blinking
Solid - On
18
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