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

MI 611-182 – March 1996
WATERTRAP Probe
WATERTRAP Performance
The WATERTRAP probe will allow vapors (including water vapors) to pass through to the
analyzer unhindered while blocking the passage of water and other more viscous liquids. The
membrane will not reduce flow to the OVA or TVA-1000 (unless the membrane becomes
coated or contaminated), and it will not be corroded by most chemical vapors.
NOTE: The WATERTRAP membrane is not chemically compatible with hydrofluoric
acid.
Membrane Installation Instructions
NOTE: Take care not to touch or damage the membrane surface.
1. Loosen the probe nut and remove the WATERTRAP probe from the OVA or
TVA-1000 readout assembly.
2. Disassemble the WATERTRAP probe by grasping the probe’s lower half and turning
the probe half counterclockwise with probe tip in upright position.
3. Insert the tip of the probe into the back end of the probe’s lower half.
4. Use the probe tip to push the membrane support and membrane/O-ring assembly
gently out of the lower half of the probe body.
5. Remove and discard the used membrane/O-ring assembly.
6. Re-install the membrane support into the lower half of the probe body with the
rough side facing up.
NOTE: Take special care not to contact or damage the membrane during reassembly.
7. Place a new membrane/O-ring assembly over the membrane support and align the
O-ring over the O-ring groove. The O-ring should be at the top of the membrane.
8. Carefully press the O-ring into the groove at two opposite locations.
9. Repeat the previous step at different locations until the entire O-ring is depressed
approximately one half of its depth. The membrane should not be tightly
stretched.
10. Reassemble the probe by grasping each end by hand and turning clockwise until
tight.
11. Reinstall the WATERTRAP probe in the OVA or TVA-1000 and tighten the
probe nut.
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