ENMET ISA-M - Manual (Page 10)

ENMET Corporation ISA – M
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5.0 Operation 5.0 Operation
Mount and install the ISA – M electronics unit and sensor as outlined in the previous section (4.0).
N OTE : There is no ON/OFF switch on the unit. As a safety device, this unit is designed to be powered and ON at all
times.
5.1 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 .
Reference: State of Operation of the ISA – M
Green power light is on. Green power light is off.
No alarms. Red or Amber light is on.
Switch is in the operate position. Audio alarm on.
Normal Operation:
Enclosure feels warm to the touch.
Alarm State:
Relay contacts in alarm position.
W ARNING : Any spontaneous alarm not triggered by the initial warm-up or rough test ( see section 5.3) should be
considered a potentially serious gas alarm situation.
T AKE A CTION !
è Vacate all persons from the affected area. Observe these people for signs of toxic gas poisoning, carbon
monoxide poisoning, etc.
è 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.
è Check all gas appliances and fixtures for leaking gas, pilot light failures, defective valves, and improper
ventilation.
è Follow your company's prescribed safety procedures in addition to those mentioned above.
5.2 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.
5.3 Rough Test
To see that the instrument is capable of alarming:
1. Hold a butane lighter near the sensor cover.
2. Briefly depress the lever, without striking the flint, to squirt some butane vapors.
3. The alarm should trigger; green power light goes off and the red light and horn activate.
C AUTION : This rough test method is best for units that are set primarily for hydrocarbon responses (combustible). Many
units set to respond to toxic gases or vapors require calibration gas to verify the alarm response capability.