Analytical Industries GPR-7500 AIS Trace PPM Hydrogen Sulfide Analyzer - Manual (Page 12)

Advanced Instruments, Inc.
12
Mounting of the Transmitter
The GPR-7500AIS transmitter consists of two interconnected enclosures (without the optional sample
conditioning system and panel) and measures 8”H x 15-3/4”W x 7”D. This configuration is designed to be
mounted directly to any flat vertical surface, wall or bulkhead plate by using eight (4) of the appropriate
screws.
To facilitate servicing the interior of the transmitters,
secure the back plate to a vertical surface
approximately 5 feet from the floor or a level
accessible to service personnel. This requires the
user to supply four (4) additional proper size screws
and anchors.
Caution: Do not remove or discard the
gaskets from either the Ex enclosure or
the fiberglass enclosure. Failure to
reinstall either of the gaskets will void the
NEMA 4 rating and the immunity to RFI/EMI.
The transmitters design provides immunity from
RFI/EMI by maintaining a good conductive contact
between the two halves of the enclosures via a
conductive gasket (the smaller enclosure containing
signal processing electronics). The surfaces
contacting the conductive gasket are unpainted. Do
not paint these areas. Painting will negate the
RFI/EMI protection.
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.