Essential Health & Safety Requirements | 49
Electronics Control Board
1. Shut off system power and sample and reference gas flows at their
sources.
2. Carefully remove the lid and set it aside.
3. Disconnect the plugs from J1 and J2.
4. Remove the two screws (22), pull the board slightly forward to clear
the bracket, and pull the board from its connector.
5. Firmly press the new board into its connector and install the two
screws.
6. Connect the plugs to J1 and J2.
7. Re-install the lid.
8. Apply power to the system, allow it to warm up, and resume opera-
tion.
Thermal Cutout Link S2
1. Shut off system power.
2. Carefully remove the lid and set it aside.
3. Determine reason for thermal runaway inside of the field unit. S2 is a
72 °C device. Inside temperature is normally regulated at 40 °C.
4. Disconnect the link from TB3-5 and -6.
5. Connect the new link to TB3-5 and -6.
6. Re-install the lid.
7. Apply power to the system, allow it to warm up, and resume opera-
tion.
Moisture Generator Reservoir Refilling
Perform this procedure as quickly as practicable to keep downtime to a minimum and
heaters from cooling.
1. Shut off system power.
2. Carefully remove the lid and set it aside.
3. Remove the thermistor from the top of the moisture generator with a
7
/
16
-in. wrench; pull the thermistor straight out.
4. Obtain a syringe (5 or 10 mL) and a
1
/
16
-in. plastic tubing to fit the
nozzle. Cut the tube to a length so that it reaches a nominal 0.75 inch
straight into the generator.
Take care you do not puncture the permeation tube inside the generator.
!
CAUTION
NOTE
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