Envent Engineering Ltd. Page 38 Revision 2.4
H2S Sensing Tape Issues
Tape does not
advance
No tension on take up reel Check setscrew in take up reel collars, if
loose; tighten up with a 1/16" hex key. Do a
manual advance on H2S sensing tape. To
do a motor run: Display>Press Menu Button
until "MTR Run">Press right button.
This will activate the motor and move the
H2S Sensing tape for a few seconds.
Tape breaking High liquid content in sample
gas
Genie probe and additional filtration may be
required in sample conditioning system.
Feed wheel not spinning freely Dust and refuse build up between feed
wheel and chassis. Requires removal and
cleaning of chassis.
Tape cover wheels pressing
against H2S sensing tape
H2S sensing tape cover wheel became
warped. Needs to be flattened to not
contact tape when on feed wheel bolt. If
replacement needed, consult Envent
Engineering Ltd.
Trigger slide not seated
properly
Ensure trigger slide is seated in groove of
sample chamber.
Overlapping
Stains
This is normal in the 1st 1/4 of
a new H2S sensing tape. It
should not cause any reading
problems.
If it is causing reading problems, the "stop
threshold" can be modified from 1,000,000
to 500,000. Please consult Envent
Engineering Ltd before proceeding with this
change.
Excessive H2S
sensing Tape
consumption
Sample vent either blocked or
frozen
Check there is no blockage on the vent
and/or eductor. Vent tubing and fittings
should be 316 stainless steel 3/8'' or larger
on a downward slope. Possible heat trace
required.
Contaminants in sample
chamber
Clean sample chamber. Replace aperture
and window if required. Contact Envent
Engineering Ltd for replacement and
assistance.
H2S Sample inlet constantly
being out of range from
original analyzer intent
If the H2S sample inlet is greater than the
range of the analyzer, the tape will be
consumed after than in normal operation.
Aperture out of place Take out the sample chamber, unscrew the
sensor block and check that the aperture is
not out of place. If so, refer to "Aperture
Strip" on page 19 for aperture size and "H
2
S
Gas Calibration" on page 28.
Continued on next page
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