ENMET ISA-44-RALE-OD - Manual (Page 30)

ENMET Corporation ISA-44RALE-OD/ISA-44RAHE-OD/ISA-44E-OD
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Top View Side View, Cut-away
Figure 11: Oxygen Cell Enclosure
3. OXYGEN CELL:
Remove the two screws on the top of the oxygen cell enclosure. Pull the circuit board off the old oxygen cell, and
remove the oxygen cell. Using the wire cutters, clip off approximately ½ of each pin on the back of the new cell. Put
the new cell into the clip of the enclosure, put the cell circuit board on it. Take precaution not to damage the
thermsistor on the circuit board. Replace cover.
4. If the MOS sensor is replaced, recalibrate the CO channel. If the oxygen cell is replaced, recalibrate the oxygen
channel. If both sensing elements are replaced, recalibrate both channels.
5. Replace enclosure covers. Sensor replacement is complete.
7.2 LED Replacement
The LED's (light emitting diodes) and colored lenses should last for the life of the instrument. However, if one should
break or burn out, replacement is simple.
MATERIALS:
q
Resin-core solder
q
soldering iron
q
shrink tubing for wire
q
replacement LED or lens (see section 8.0 for part numbers)
PROCEDURE:
1. Remove the display plate.
2. Pull the LED out from the plastic lens. Remove the shrink tubing which covers the solder connection between the
LED and the wiring.
3. Note which wire is connected to the negative lead of the LED (the flattened area of a small lip around the base of
the LED is on the side of the negative lead). Unsolder the old LED. Solder the new LED to the wiring. When the
LED is soldered in, put shrink tubing over the connection, and apply heat to shrink.
4. If the lens requires replacement, pop the old one out through the front of the display plate. Push the new one in
from the front of the display plate until it snaps into place.
5. Push the LED up into the lens until it snaps into place.
6. Replacement is complete.
Oxygen Cell
(Below PCB)
Clip for
Oxygen Cell
Thermsister