ENMET ISA-44-RALE-OD - Manual (Page 18)

ENMET Corporation ISA-44RALE-OD/ISA-44RAHE-OD/ISA-44E-OD
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4.0 Operation 4.0 Operation
4.1 Operation of the ISA-44RALE-OD
The ISA-44RALE-OD should operate continuously 24 hours a day, 7 days a week. Power to the instrument should not
be turned off frequently; doing so will affect instrument accuracy.
During operation, air must flow continuously over the sensors. Failure to provide the sensor with a continuous air flow
results in an inaccurate instrument, possible false alarms, and contaminated or burned out sensors.
PROCEDURE:
1. Keep the unit on power.
2. Make sure that air is flowing continuously over the sensors and that the bubbler has sufficient clean water. Adjust
the pressure regulator so the pressure gauge reads between 5 and 10 PSI.
3. Set the Purge/Operate/Horn-off switch to OPERATE.
4. Whenever an alarm activates, take action immediately.
5. Every few weeks, supply clean air to the sample head assembly (use bottled 20.9% oxygen if necessary) and adjust
the oxygen gain potentiometer so that the oxygen meter reads 20.9.
C AUTION : When making this adjustment, it is imperative that air containing 20.9% oxygen (oxygen content of fresh air) be
supplied to the sample head assembly.
W ARNING : Any other adjustments of the oxygen gain potentiometer, either accidental or otherwise, will result in inaccurate
oxygen detection, a situation of great potential danger to workers utilizing the supplied air.
6. Calibrate the gas channel once every 3 months. If either channel fails a Rough Test (section 5.0), that channel
must be calibrated. See section 6.0 for calibration procedures.