
ISA-44RAL-OD / ISA-44RAH-OD ENMET Corporation
7
3.2.1 CO Circuit
Refer to Figure 2
PURGE ADJUST
POTENTIOMETER
Adjusts purge voltage. Operation switch must be in purge position to adjust
purge voltage.
HEATER ADJUST
POTENTIOMETER
For adjusting the MOS sensor heater operating voltage. DO NOT adjust this
potentiometer unless a voltage reading indicates that an adjustment is necessary.
(May need adjusting after replacing sensor cable assembly). Voltage: .86 Vdc
+ .03 Vdc
METER ADJUST
POTENTIOMETER
To adjust and set the meter for appropriate gas response during calibration.
LOW LEVEL ALARM SET
ADJUST POTENTIOMETER
For adjusting the trip level of the CO low level alarm light.
HIGH LEVEL ALARM SET
ADJUST POTENTIOMETER
For adjusting the trip level of the CO high level alarm light and the audio alarm.
3.2.2 Oxygen Circuit
Refer to Figure 2.
OXYGEN ALARM SET For adjusting the trip level of the audio alarm and the amber oxygen alarm light.
NULL ADJUST For adjusting oxygen circuit voltage during calibration.
METER FULL SCALE ADJUST For adjusting full scale meter reading during calibration.
LOW LEVEL SET For adjusting oxygen circuit voltage during calibration.
Figure 3: Relay Hook-up, Internal Power Figure 3a: Relay Hook-up, External Power
Figure 3: Relay Hook-up, Power Internal and External
(example)
switch to silence
an Auxiliary Alarm
110 VAC
Hot
Auxiliary Horn
(example)
switch to silence
Outside Source
Hot
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