RKI Instruments 65-2331RK - Manual (Page 16)

12 • 65-2331RK H
2
S Transmitter
Table 2: Troubleshooting H
2
S Transmitter
Replacing Components of the H
2
S Transmitter
This section includes a procedure to replace the H
2
S plug-in sensor and amplifier. A
procedure to replace the entire detector assembly is at the end of this section. In most
cases, it is not necessary to replace the entire detector assembly.
Replacing the Plug-In H
2
S Sensor
CAUTION: The sensor contains electrolyte which is a dilute acid. Do not disassemble the sensor
when replacing it with a new one. If sensor electrolyte comes in contact with your
skin, wash affected area thoroughly with soap and water.
1. Turn off the controller.
2. Turn off or unplug power to the controller.
Condition Symptom(s) Probable Causes Recommended Action
Fail Condition • Controller indicates a
fail condition.
• The transmitter wiring
to the controller is
disconnected or
misconnected.
• The plug-in sensor is
not properly plugged
into the sockets in the
detector housing body.
• The wiring from the
detector to the
amplifier is
disconnected or
misconnected.
• The transmitter’s zero
reading is low enough
to cause a fail
condition.
• The transmitter is
malfunctioning.
1. Verify that the transmitter wiring to the
controller is correct and secure.
2. Confirm that the plug-in sensor is
installed properly.
3. Verify that the wiring from the detector
to the amplifier is correct and secure.
4. Perform a fresh air adjustment. A full
calibration is recommended.
5. If the fail condition continues, replace
the plug-in sensor as described later
in this section.
6. If the fail condition continues, contact
RKI for further instruction.
Slow or No
Response/
Difficult or
Unable to
Calibrate • Transmitter responds
slowly or does not
respond to response
test.
• Unable to accurately
set the zero or
response reading
during calibration.
• Transmitter requires
frequent calibration.
Note: Under “normal”
circumstances, the
transmitter requires
calibration once every 3
months.
Some applications
may require a more
frequent calibration
schedule.
• The calibration cylinder
is low, out-dated, or
defective.
• The flame arrestor in
the detector housing
cap is wet or clogged
with dirt or other
particulates.
• The calibration gas is
not an appropriate
concentration.
• The transmitter is
malfunctioning.
1. Verify that the calibration cylinder
contains an adequate supply of a
fresh test sample.
2. Check the detector housing cap to
determine if the flame arrestor is wet
or dirty. Clean if necessary.
3. Verify that the calibration gas
concentration is appropriate for the
transmitter. Zero emission air (20.9%
oxygen) is normally used for a zero
adjustment if the environment is
suspect and 25 PPM H
2
S in nitrogen
is normally used for a response test.
4. If the calibration/response difficulties
continue, replace the plug-in sensor
as described later in this section.
5. If the calibration/response difficulties
continue, contact RKI for further
instruction.