Analytical Industries GPR-7500 AIS Trace PPM Hydrogen Sulfide Analyzer - Manual (Page 14)

Advanced Instruments, Inc.
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Note: If equipped with optional H2S scrubber, the H2S from the sample gas will be removed by the
scrubbing material. The scrubbing material changes its color from purple to light pale. Replace scrubbing
material when 2/3 of the material had changed its color from purple to pale.
As a safety, connect the vent line of analyzer to a vent pipe for safe venting of sample gas that
might contain un-scrubbed H2S
If equipped with optional coalescing filter, mount the entire panel to any vertical flat surface. If possible,
connect the drain valve outlet to a vent pipe.
Keep the drain valve on coalescing filter closed during normal operation. To drain liquid, open the drain
valve. After draining the liquid, turn the drain valve off.
Do not leave the drain valve open when the drain outlet is not connected to a vent pipe. Failure
to do so will cause H2S to leak into atmosphere and cause potential hazard.