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

Maintenance MI 611-185 – June 1996
8. Turn the end cap over so the red outer surface lies flat and the gray surface faces
up.
9. Place the new flame arrestor in the center hole.
10. Place a screwdriver on the newly installed flame arrestor.
11. Strike the end of the screwdriver with a hammer to secure the new flame arrestor
in place.
12. Replace the spring.
13. Replace the detector cap on the unit.
Cleaning the FID or PID Detector Cavities
1. Close the hydrogen supply valve on the side of the instrument. Turn the instrument
off.
2. Using the special spanner wrench provided with the tool kit, unscrew the cap
holding the respective detector cap.
3. Using the special extractor tool provided with the tool kit, screw the extractor into
the cartridge.
4. Remove the cartridge by pulling on the extractor. Unscrew the extractor from the
cartridge.
5. Carefully clean the inside of the detector cavity using a cotton swab and isopropyl
alcohol. Be sure to clean the high voltage contacts along the side of the cavity. Be
especially careful around the detector signal collector probe at the rear of the cavity
(and the thermocouple probe in the FID).
6. Dry the inside of the cavity using a low heat gun.
7. Insert the cartridges into their respective cavities by reversing the procedure. Note
that the cartridges must be rotated to properly locate the key tabs.
CAUTION: Do not intermix the detector cartridges.
Cleaning or Replacing a Sintered Metal Filter
To remove the sintered metal filter cup from the close area sampling assembly, simply unscrew
the cap from the sampler and tip the assembly so that the filter falls out. The same filter cup
and spring are also located behind the sample line quick connect at the sidepack assembly. To
remove, unscrew the quick connect so that the filter falls out. The internal spring will not fall
out. Refer to the assembly diagram below.
You may clean the filter by immersing it in isopropyl alcohol or equivalent solvent and/or
swabbing the surface with a Q-tip or cotton swab. After thoroughly cleaning the surface of the
filter, place the filter in an oven and dry it at 40 °C to 55 °C for one hour. You can then reinsert
the filter into the sampling assembly (with the closed end of the filter in first) and screw
in the cap.
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