CMS-2 CARBON MONOXIDE MONITOR
Page 13
© 2018 CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 22925, Rev. I, 04/18
7.0 TROUBLESHOOTING
WARNING
Shorting electrical components can result in
serious electrical shocks or can damage
equipment. All electrical troubleshooting must
be performed by a qualified electrician.
7.1
Instrument Will Not Calibrate: If the alarm
sounds when test gas is applied but does not stop
when gas is removed, or if response is very slow.
7.1.1
Calibration humidifier not moistened during
calibration. Make sure that the humidifier sponge is
dampened with distilled water before calibrating.
7.1.2
Replace
sensor.
7.2 Intermittent
Alarm:
A pressure switch mounted
on the circuit board monitors pressure of the sample air
delivered to the sensor. If pressure at the switch (which
is monitored by flow through the flow meter) drops below
minimum requirement or rises above maximum psi, the
monitor will initiate an intermittent alarm.
7.2.1
Before doing pressure tests, make sure the
Run/Calibration toggle switch is toward RUN position. If
for any reason the toggle is not in the RUN position, the
instrument will initiate an intermittent alarm, indicating that
the sample air is not reaching the sensor. Correctly
positioning the toggle will terminate the intermittent alarm.
7.2.2
Make sure the pressure of the sample air is
between 55 psi and 100 psi. If the sample air is higher
than 55 psi, the restriction is internal. Proceed as
follows:
7.2.3
Check flow through the flow meter. If the flow
ball is below 0.5 SCFH or above .9 SCFH, adjust the
internal pressure regulator accordingly, until the ball
remains between 0.5 and 0.8 SCFH. The regulator was
factory set slightly higher than the pressure switch and
should rarely require adjustment. If the regulator
pressure was outside the limits, the alarm will disengage
as soon as the pressure is corrected. After the pressure
is correctly set, close the faceplate.
7.2.4
If the flow meter ball does not raise or stays very
low in the meter:
7.2.4.1
Check internal instrumentation lines for breaks,
kinks, or disconnection. If a line has come loose,
reconnecting it will re-establish function and the monitor
can be correctly used
. NOTE: This type of failure
could be the result of improper service, as the
instrument is tested with pressure much higher than
operating pressure. The monitor should be returned
to the maintenance service technician for review as
soon as practical.
7.2.4.2
Check the purple and red orifices (usually the
purple orifice) for blockage. Replace the orifice if it is
blocked.
7.3
No Annunciator Lights or Alarms: This
condition indicates a loss of electrical power, as it is
unlikely that audible and visual alarms will fail at the
same time.
7.3.1
Make sure the electrical power cord is
connected to the appropriate power source.
7.3.2
Check the fuse located inside the case; make
sure it is not blown.
7.3.3
Make sure the power supply is ON.
7.3.4
For 12-volt system, make sure the battery is fully
charged and that the charging system is operational.
Make sure the positive and negative terminals are
connected correctly.
7.3.5
Check for faulty transformer or loose plug
connection on circuit board.
7.4
Either Alarm Light or Audible Alarm Fails:
7.4.1
Check for loose plug connections on circuit
board.
7.4.2
To test the alarm, remove the plug connection
on the circuit board from the suspect alarm and apply
external 12-volt power. If the alarm fails to activate,
replace it.
7.4.3
To test the circuit board, remove the plug
connection from the faulty alarm. Use a voltmeter to
check voltage across circuit board pins. When testing an
audible alarm, switch the Run/Calibration Switch to the
Calibration
position. This will cause an intermittent
alarm and should register on the voltmeter each time the
alarm activates. Monitors with faulty circuit board should
be returned for service.
