Thermo Scientific TVA-1000B Instruction Manual - Geotech ...

MI 611-185 – June 1996
Maintenance
NOTE: A bleeder assembly is provided in the tool kit to allow the hydrogen tank to
be emptied for common carrier shipment. To use the bleeder, manually screw the
bleeder onto the tank valve and allow the hydrogen to vent. This process will take
about two minutes to complete.
CAUTION: Observe all hydrogen handling procedures listed above.
When transporting the instrument, remove the hydrogen tank and place it in its normal location
in the carrying case.
To fill the tank, use the following procedure:
NOTE: All hydrogen fittings are left hand thread — do not overtighten.
1. Turn supply tank valve OFF.
2. Attach tank fill adapter to supply tank with valve OFF and with manifold valve on
OFF position.
3. Attach TVA-1000B hydrogen tank to tank fill adapter. (Note left hand thread —
do not overtighten.)
4. Open supply tank valve. Move fill adapter valve to FILL position.
5. Wait for TVA-1000B tank to fill. This may take 2 to 3 minutes because of flow
restrictors in the tank and fill adapter.
6. Close fill adapter valve.
7. Remove TVA-1000B tank.
8. Close supply tank valve.
9. Remove tank fill adapter.
Always remove the tank from the instrument before storing in the instrument carrying case.
Servicing the PID Cartridge
To service the PID cartridge, use the following procedure:
1. Turn the instrument OFF.
2. Using the special spanner wrench provided with the instrument tool kit, unscrew
the blue cap holding the PID cartridge in place.
3. Screw the special extractor tool provided with the accessory kit into the off-center
hole in the cartridge. (Do not exceed three full turns. Refer to Figure 10.)
4. Remove the cartridge by pulling on the extractor. Unscrew the extractor from the
cartridge. Clean or replace the cartridge.
5. To insert a new cartridge, reverse the procedure. Note that the standard 10.6 eV
PID cartridge is marked with a blue band. Other energy level lamps are marked
with different colors (not red).
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