Envent Engineering Ltd. Page 36 Revision 2.4
H2S Readings Issues (Cont’d)
Sensor/ sensor wire failure Re-zero the sensor block. Refer to "Re-zero
Sensor procedure" on page 29.
If procedure fails, sensor or sensor wire
may require replacement.
Gain set too high Gain is too high for the current setup. Re-
calibrate analyzer and refer to current gain
(from factory). The difference between
factory gain and new gain should not be
greater than +/- 2%. If necessary, do a gas
calibration. Refer to "H
2
S Gas Calibration"
on page 28
Higher than required
pressure/flow
Adjust pressure regulator to 15psig and flow
meter to "2"
Dilution canister tubing loose
(Dilution option only)
Tubing inside the canister leaking. Open
canister (follow all safety procedures to
bleed out all high H2S level concentrations)
and re-connect the tubing to the fittings on
canister lid. Contact Envent engineering Ltd
for replacement if required.
Total Sulfur's Hydrogen flow
was decreased at the flow
meter (Total Sulfur option only)
The flow of hydrogen being mixed with
sample gas has been decreased. Either the
hydrogen bottle is empty, or the flow was
decreased through the flow meter knob.
Adjust back to appropriate flow rate.
Lower than
Expected
Readings
Leaks in the sample system
causing lower readings
Do a leak check on the sample system and
humidifier. Use Snoop to detect the
possible leaks in the system.
Flow is too low Make sure that the flow of sample gas
coming into the analyzer is set to "2" (83.63
cc/min) at the flow meter.
Gain set too low Gain is too low for the current setup. Re-
calibrate analyzer and refer to current gain
(from factory). The difference between
factory gain and new gain should not be
greater than +/- 2%. If necessary, do a gas
calibration. Refer to "H
2
S Gas Calibration"
on page 28
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