Specifications

Analytical Modules, continued
Replacement of
Thermistor Board
Step Procedure
1. Making note of the connection location for each wire, remove
the wiring that is connected to the Thermistor/Filament Board
that is to be removed. Remove the wires by carefully pulling on
the end of the metal connector.
2. Remove the Thermistor Board by removing the Button Head
Hex Screw, the Lockwasher, and the Flat Washer as shown in
figure 4-9.
3. Discard O-rings (13). Do not attempt to reuse old O-rings.
4. Remove the two metal inserts. These CAN be reused.
5. Before installing new board, examine the mounting surface and
the holes for the Thermistors to verify there is no contamination
or scratches on the machined surface.
If there is contamination on the surface, clean it using lint free
cloth and a cleaning solvent such as acetone or hexane. If the
surface is scratched it may be necessary to replace the
complete assembly.
CAUTION: The elements on the board are exposed and are
very delicate. Handle the board only by its edges.
Hands and tools must be clean.
6. Install the metal inserts in the detector block. These inserts
should be installed with the groove perpendicular to the tube
holes in the block (so that air cannot flow in a straight path
between the holes). Refer to Figure 4.10
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