Sierra Monitor Corporation 4501-05 - Manual (Page 22)

Model 4501-XX Toxic Gas Sensor Module
Page 18 of 35
7.5.4 MOISTURE TRAPS AND RAINSHIELDS
• Conduit seals and drains installed to avoid moisture build up in electronics enclosure. Water
accumulation in sensor module enclosures is a major cause of damage and system failures - take
precautions to seal electrical conduits and provide moisture traps and drains to avoid water damage.
• Rain-shields installed where applicable.
7.5.5 STANDARD VOLTAGES
• Loop voltage to be applied to the sensor module must be between 14 VDC and 30 VDC.
7.6 INSPECTION AND TROUBLESHOOTING GUIDE
The inspection and troubleshooting guide can be used to step through the system start-up and to determine
the corrective action if a fault occurs.
7.6.1 IF MODULE DOES NOT RESPOND TO GAS
1. Repeat calibration procedure.
2. Remove the gas and wait for the timer to completely count down.
3. Apply calibration gas and verify that the sensor sees calibration gas after calibration.
4. If the sensor still does not see gas, power cycle the unit and repeat calibration.
7.6.2 IF THE MODULE DISPLAYS “STARTING” FOR MORE THAN 1 HOUR
1. Make sure the sensor is place in an ambient room temperature environment.
2. Power cycle the sensor.
3. Ensure that the sensor is not exposed to the gas of interest during warm-up.
7.6.3 IF THE MODULE DOES NOT DISPLAY THE CORRECT PPM
1. Power cycle the unit.
2. Recalibrate the sensor.
7.6.4 IF THE DISPLAY SHOWS ‘F’ OR “NO SENSOR”
1. Power down the unit.
2. Open the enclosure and unplug the sensor assembly from the transmitter board.
3. Plug the sensor back into the transmitter board carefully and ensure a secure fit.
4. Check all wire connections.
5. Power up the unit.
6. If the system still shows ‘F’, apply magnet to ‘M’ key, then ‘E’ key. The module will start scrolling an
error message. Please write that message down and contact Sierra Monitor for assistance.
7.6.5 IF THE DISPLAY SHOWS ‘C’
1. Complete calibration and exit to operating mode.