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

WATERTRAP Probe MI 611-182 – March 1996
Membrane Life
The life of the WATERTRAP membrane depends largely upon the conditions the membrane
is exposed to. Theoretically, the membrane can last several months under normal ambient
conditions; however, this lifetime will be shortened considerably by prolonged exposure to liquids,
particulates, high temperatures, and high humidity.
Membrane Replacement Suggestions
It is recommended to verify the integrity of the membrane each time your analyzer is used. It
is also recommended to replace the membrane each month if the OVA or TVA-1000 is used
daily. Otherwise, the membrane should be replaced during quarterly instrument evaluations.
The membrane should also be replaced after contact with liquid. In some instances, a membrane
can be restored after contact with only water by shaking the water from the probe.
However, if the membrane is contaminated by an oily or high surface tension liquid, it should
be replaced immediately and the entire probe assembly thoroughly cleaned. Under dusty conditions,
membrane operation should be checked frequently. Finally, the membrane should be
replaced if it becomes torn, ruptured, or if its surface becomes coated by foreign material.
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