Gas Tracer Operator’s Manual, CSA Version
Replacing the LEL and CO Filters • 169
4. Insert the battery pack into the charging station as shown in Figure 27 below
so that the metal contacts on the back of the battery pack come into contact
with the metal contacts in the charging station. When proper contact has been
made, the red LED on the charging station will turn on.
Figure 27: Putting the Battery Pack into the Charging Station
5. When a full charge has been reached, approximately 4 hours, the red LED on
the charging station will turn off. Remove the battery pack from the charging
station and unplug the charging station’s power cord from the AC outlet.
Replacing the LEL and CO Filters
The H
2
S filter disk is dark red in color and although it may darken over time, its
color is not indicative of remaining filter life. The H
2
S filter disk can absorb H
2
S
for 33 ppm hours and should be replaced after that much exposure. With this
many ppm hours of absorption, the H
2
S filter disk should be replaced after 80
minutes of exposure to 25 ppm H
2
S. This equates to replacing the H
2
S filter disk
after 40 2-minute calibrations with a cylinder containing 25 ppm H
2
S. If H
2
S exists
in the monitoring environment, the H
2
S filter disk will have to be replaced more
frequently.
1. Verify that the Gas Tracer is off.
2. Use a screwdriver to remove the three screws holding the belt clip to the back
side of the instrument. Two of these screws also secure the flow chamber.
3. Remove the belt clip and unscrew the remaining screw holding in the flow
chamber.
4. Grab the exhaust tube and pull it gently away from the unit to slide the flow
chamber out of the unit. The CO (charcoal) filter may come out.
5. To replace the LEL filter, remove the old one from its recess in the sensor
gasket and replace it with the new one making sure that it is properly seated.
You do not have to remove the sensor gasket to replace the LEL filter. It sits in
a recess on top of it.
Battery Pack
