RKI Instruments Digester Gas Monitor - Manual (Page 85)

Digester Gas Monitor Operator’s Manual Troubleshooting • 79
Troubleshooting
Table 22 describes symptoms, probable causes, and recommended actions for the most
common problems you may encounter with the Digester Gas Monitor.
Table 22: Troubleshooting the Digester Gas Monitor
Condition Symptom(s) Probable Causes Recommended Action
No Power to
Instrument
and/or
Display PCB • The PILOT light
is off.
• The display
screen is blank.
• The power wiring is
disconnected or
misconnected.
• The AC fuse is
blown.
• The display cable is
disconnected or
misconnected.
1. Verify that the wiring to the power
source is correct and secure.
2. At the Digester Gas Monitor,
verify that the wiring to the AC in
terminal strip is correct and
secure.
3. Check the continuity of the AC
fuses.
4. Verify that the display cable is
connected.
The display (ribbon) cable plugs
into a rectangular connector on
the top edge of the control PCB
and on the top edge of the main
PCB (labeled Front Panel).
5. If the power difficulties continue,
contact RKI for further instruction.
Frequent or
Suspect
Alarms • The Digester
Gas Monitor
alerts you to
frequent or
suspect alarms.
• The detectors’
fresh air
readings remain
on zero (20.9 for
oxygen) despite
alarm
occurrences.
• The Digester Gas
Monitor is
experiencing false
readings due to RFI
or EMI.
• The detector wiring
has one or more
intermittent
connections.
1. Verify that the detector wiring is
correct and secure.
2. Increase the alarm on delay
setting in the Configuration Menu.
3. Increase the noise filter in the
Configuration Menu.
4. If the frequent or suspect alarm
difficulties continue, contact RKI
for further instruction.
Momentarily
Unstable Gas
Readings on
Display • The display
reading for one
or more
channels rises
or falls briefly
and then returns
to the normal
fresh air
reading. • The Digester Gas
Monitor is
experiencing false
readings due to RFI
or EMI.
• The detector wiring
has one or more
intermittent
connections.
• The noise filter
setting is too low.
• The dead band
setting is too low.
• The display screen
is malfunctioning.
1. Verify that the detector wiring is
properly shielded.
2. Verify that the detector wiring is
correct and secure.
3. Increase the noise filter setting in
the Configuration Menu.
4. Increase the dead band setting in
the Configuration Menu.
5. If the difficulties continue, contact
RKI for further instruction.