ENMET ISA-44-2OD - Manual (Page 16)

ENMET Corporation ISA-44-2-OD
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4.0 Operation 4.0 Operation
Mount and install the ISA-44-2-OD electronics unit and sensors as outlined in the previous Section.
NOTE: There is no ON/OFF switch. As a safety device this unit is designed to be powered and ON at all times.
4.1 Warm-Up
1. Turn the switch to P URGE O N (when applicable) or H ORN O FF .
2. For 5-30 minutes, after first applying power, the red gas alarm light stays on as the sensor heats and purges
(clears) its surface of contaminating molecules that have collected while the sensor was inactive.
3. When the red and amber light turns off, and the green power light comes on, the initial warm-up is complete.
4. Turn the switch to OPERATE .
4.2 Operation Condition
Table 6: Reference, State of Operation of ISA-44-2-OD
Normal operating state • No alarms
• Green light on
Alarm state • Green light off
• Amber light (low level alarm) or
• Amber light, Red light and Audio Alarm (high level alarm)
• Appropriate relay contacts in alarm position
Sensor fault or
disconnected • Green and red light on together.
Any spontaneous alarm on any channel, not triggered by the initial warm-up or rough test (Section 4.4) should be
considered a potentially serious gas alarm situation. T
AKE A CTION . V AC ate all persons from the affected area.
Observe these people for signs of toxic gas poisoning, carbon monoxide poisoning, etc. Open windows or vents where
it is feasible; then after the contaminated area is cleared, turn off all gas and electric appliances and gas pilot lights.
Check all gas appliances and fixtures for leaking gas, pilot light failures, defective valves, and improper ventilation.
Follow your company's prescribed safety procedures in addition to those mentioned above.
4.3.1 Precautions
Do not blow cigarette smoke on a sensor.
Do not squirt pure gases or liquid hydrocarbons, such as butane, propane, gasoline, etc. directly on the sensor.
Do not use a strong cleaning agent, wax or lacquer near a sensor.