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REPLACEMENT PART INSTRUCTIONS
Batteries
Check batteries each time instrument is turned on by noting that the green NORMAL light is on
and the yellow LOW BATTERY light is off. If the yellow light is on, the batteries need replacing.
Two 9 volt alkaline batteries will power the monitor continuously for approximately 30-35 hours.
Batteries are contained in drawers on the right-hand side.
To replace the batteries:
Pull the small slot in the drawer face toward the front of the monitor to unlatch the drawer and pull
the drawer out of the housing.
Pry battery out of drawer with fingers and replace with a fresh 9 volt alkaline battery, providing for
proper polarity by placing minus (-) terminal uppermost in holder. Place bottom of fresh battery
against spring and press into place.
CAUTION:
Observe proper polarity when inserting batteries. Polarity is marked on the inside of the drawers.
Push drawer back into housing until it latches in place. Drawers inserted incorrectly will not latch.
Repeat above steps for the second battery. (It is possible to operate with only one battery, but
operating hours will be greatly reduced).
3M
TM
Carbon Monoxide Sensor 529-05-22
To replace sensor: (Fig. 4)
Remove the two knurled thumbscrews at bottom.
Pull the bottom plate off the housing as far as the wiring will allow.
Remove the 2 screws holding the wire connectors’ circuit board/sensor cell in flow block.
An o-ring is located under the sensor at the bottom of the flow block cavity – DO NOT LOSE.
Pull the wire connectors’ circuit board from the sensors’ pins carefully so as not to damage the
circuit board.
Discard old sensor cell. It contains a small amount of sulfuric acid. Dispose of sensor according
to local regulations.
CAUTION:
The sensor in the carbon monoxide monitor contains a small amount of sulfuric acid. Always wash
hands thoroughly after handling sensor cell. Sulfuric acid is poisonous and can cause severe burns.
Do not allow acid to contact skin or eyes. If eyes are exposed to acid, flush thoroughly and seek
immediate medical attention.
The wire connectors’ circuit board relates to the 3 pins on the sensor as shown in figure 4. The
fourth pin is used as a guide pin to install circuit board to sensor. Carefully press circuit board
evenly on sensors’ 4 pins. New sensors have a shorting wire/spring between the sensing and
reference pins, remove and discard.
38-9018-0147-2_CarbMonMan 6/12/03 10:52 AM Page 13
