CMS-1 CARBON MONOXIDE MONITOR
Page 7
© 2017 CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 23301, Rev. F
maintaining pressure on the paper clip, plug the monitor
into the power supply; do not remove the paper clip.
2.5.4
Observe the display window, it will show four
lines of information; the bottom line is the trip-point (PPM
10). Within a few seconds the trip-point will change to
PPM 5; when it changes, remove the paper clip. The
trip-point is now set to alarm at 5 PPM CO. Close cover.
2.5.5
To change the trip point back to 10 PPM, unplug
the monitor and repeat the process. There are only two
settings, 10 PPM and 5 PPM.
2.6
Connecting External Alarm and Shutdown
Device, Ref. Figure 5.
Note: External alarms require external power. Do not
confuse an external alarm with the optional remote
alarm, which does not require external power.
Instructions for the remote alarm are provided with the
alarm.
2.6.1
A dry relay contact is mounted on the circuit board
(Ref. Figure 5) for use with external alarms and shutdown
devices. These contacts are rated at 5 amperes. Use the
contacts to operate relays for external devices.
Figure 5
3.0
OPERATION
Do not breathe compressed air that this
instrument monitors unless the instrument has
been calibration tested, and if needed,
calibrated per Section 4.0. Using a monitor that
has not been calibration tested can permit
undetected CO to enter the respirator air lines.
Breathing toxic gases can cause death.
3.1
Setup for Operation
3.1.1
Position the Run/Calibration toggle switch to the
RUN position.
3.1.2
Open the sample-air isolation valve to supply air
to the monitor.
3.1.3
Observe the flow meter ball, and adjust the
pressure regulator until the ball remains between .5 and .8
SCFH.
3.1.4
Plug the instrument into a grounded 120-volt AC
power supply. If the monitor was converted to operate
on 12-volt, connect to a 12-volt DC power source. Make
sure the positive and negative leads go to the correct
terminal as noted in Paragraph 2.4.2.10 and the notice
following it. There is no ON/OFF switch on the monitor; it
will begin operation as soon as power is applied.
3.2
Warm-Up Period
3.2.1
When electrical power is applied and sample-air
flow set between .5 and .8 SCFH, the monitor goes
through a warm-up period of approximately one minute.
3.2.2
During the warm-up period, the alarm horn is
disabled and the ALARM light is
yellow
.
3.2.3
At the end of the warm-up period, the alarm
horn is reactivated, and all the annunciator lights will be
green
indicating the following:
ARMED: The alarm horn is armed, to provide an
audible alarm if CO reaches the permissible limit of
10 PPM.
ALARM: There is correct sample-air flow to the
sensor.
AIR QUALITY: The sample air at the sensor does
not exceed the permissible contamination limit.
3.2.4
Make sure alarms function per Section 6.4. If the
alarms function as described, proceed to place the
instrument in operating mode, per Section 3.3.
Typical wiring for normally open alarm
Dry Relay Contact
COM
NO
NC
COM
NC
NO
Auxiliary Alarm
This contact is for external
alarms only.
Do not connect the optional
remote alarm to this contact.
L2
L1
External
Power
+
