Envent Engineering Ltd. Page 34 Revision 2.4
TROUBLESHOOTING
H2S Readings Issues
Erratic H2S
Readings
Trigger slide and H2S sensing
tape not seated properly
Ensure trigger slide and H2S sensing tape
are seated in the groove of the sample
chamber.
Pressure in building moving up
and down from fan, exhaust or
wind
The eductor should counteract this effect,
however, the eductor may be plugged or
vent blocked. Check there is no blockage
and that all vent tubing and fitting are 316
stainless steel, sized 3/8'' or larger on a
downward slope.
Sample vent/Eductor either
blocked or frozen
Check there is no blockage on the vent
and/or eductor. Check for vacuum in
Eductor block. Vent tubing and fittings
should be 316 stainless steel 3/8'' or larger
on a downward slope. Possible heat trace
required.
Analog input 2 jumper
removed
Re-install jumper in Analog Input across
(+4-20 & -4-20) on the controller board.
Sensor block fault Re-zero sensor block. Refer to "Re-zero
Sensor procedure" on page 29.
Check for green status led on sensor block
once procedure is done & proper mV on
white H
2
S sensing tape.
Sensor did not zero on white
H2S sensing tape
Check the H
2
S Sensing tape, if not properly
installed, refer to "H
2
S Sensing Tape
Change Procedure" on page 31 or on
sticker in the analyzer's door.
Perform a motor Run: Display>Press Menu
Button until "MTR Run">Press right button.
This will activate the motor and move the
H
2
S Sensing tape for a few seconds.
Re-zero sensor block if necessary. Refer to
"Re-zero Sensor procedure" on page 29.
Regulator not maintaining 15
psig (Changing flow rate to
analyzer)
Replace Regulator, Consult Envent
Engineering Ltd.
Continued on next page
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