Clemco CMS-2 User manual

CMS-2
CARBON MONOXIDE MONITOR
O. M. 22925
DATE OF ISSUE: 07/00
REVISION: I, 04/18
Do not use this
equipment before
READING this
MANUAL and
UNDERSTANDING its
contents.
These WARNINGS are
included for the health
and safety of the
operator and those in
the immediate vicinity.
Electronic files include
a Preface containing
the same important
information as in the
orange cover.
WARNING
© 2018 CLEMCO INDUSTRIES CORP.
One Cable Car Dr.
Washington, MO 63090
Phone [phone]
Fax [phone]
Email: [email protected]
www.clemcoindustries.com

CMS-2 CARBON MONOXIDE MONITOR Page 1
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
1.0 INTRODUCTION
1.1 Scope of Manual
1.1.1 These instructions cover setup, operation,
maintenance, troubleshooting, and replacement parts for
the CMS-2 contractor series carbon monoxide (CO)
monitor.
1.1.2 The CMS-2 monitor is manufactured by
Invertech Inc. for Clemco Industries Corp. The monitor is
a potential life saving instrument. To assure its
performance, the monitor must be properly installed,
tested, calibrated, and maintained. Before installing and
using the monitor, all personnel involved with the
operation and maintenance of the instrument must read
this entire manual including the orange cover.
1.2 Safety Alerts
1.2.1 Clemco uses safety alert signal words, based on
ANSI Z535.4-2011, to alert the user of a potentially
hazardous situation that may be encountered while
operating this equipment. ANSI's definitions of the signal
words are as follows:
This is the safety alert symbol. It is
used to alert you to potential physical
injury hazards. Obey all safety
messages that follow this symbol to
avoid possible injury or death.
NOTICE
Notice indicates information that is considered
important, but not hazard-related, if not
avoided, could result in property damage.
CAUTION
Caution indicates a hazardous situation that, if
not avoided, could result in minor or moderate
injury.
WARNING
Warning indicates a hazardous situation that, if
not avoided, could result in death or serious
injury.
DANGER
Danger indicates a hazardous situation that, if
not avoided, will result in death or serious
injury.
1.3 Table of Contents
SUBJECT SECTION LOCATION
INTRODUCTION ........................................................ 1.0
Scope of Manual .........................................................1.1
Safety Alerts ...............................................................1.2
Table of Contents ........................................................ 1.3
Components ...............................................................1.4
Operating Principles ...................................................1.5
Annunciator Lights, Audible Alarms, and Switches
Use and Functions ...................................................1.6
Optional Accessories ..................................................1.7
Remote alarm ...........................................................1.7.1
SETUP ........................................................................ 2.0
Mounting .....................................................................2.1
Air Pressure Requirements ........................................2.2
Connecting to Respirator Air Supply ..........................2.3
Electrical Connections ................................................2.4
120-volt AC supply.................................................2.4.1
220-volt AC 50/60-Hz supply.................................2.4.2
12-volt DC supply..................................................2.4.3
AC to 12 volt DC field conversion ........................2.4.4
Connecting External Alarm and Shutdown Device .......2.5
Changing Mode Select Dip Switch to Delay Alarm ....2.6
OPERATION .............................................................. 3.0
Setup for Operation ....................................................3.1
Warm-Up Period .........................................................3.2
Operating Mode ..........................................................3.3
Shutdown ....................................................................3.4
CALIBRATION TEST AND CALIBRATION .............. 4.0
Difference Between Calibration Test and Calibration ....4.1
Calibration test ......................................................4.1.2
Calibration Process...............................................4.1.3
Materials Required for Tests and Calibration .............4.2
Stabilization Period......................................................4.3
Prepare Calibration Connector ...................................4.4
Prepare Monitor for Calibration ...................................4.5
Calibration Test ........................................................... 4.6
Calibration ...................................................................4.7
Return Monitor to Operating Mode .............................4.8
Impurity-Free Air (zero contamination) Test ............... 4.9
GENERAL MAINTENANCE ...................................... 5.0
Care and Handling ...................................................... 5.1
Cleaning ......................................................................5.2
Calibration Test Schedule ..........................................5.3
Calibration Schedule ..................................................5.4
Alarm Test ..................................................................5.5

CMS-2 CARBON MONOXIDE MONITOR Page 2
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
SERVICE MAINTENANCE .........................................6.0
Sensor Replacement ...................................................6.1
Fuse Replacement ......................................................6.2
TROUBLESHOOTING ................................................7.0
Instrument Will Not Calibrate ......................................7.1
Intermittent Alarm ........................................................7.2
No Annunciator Lights or Alarms ................................7.3
Either Alarm Lights or Alarm Horn Fails ......................7.4
ACCESSORIES AND REPLACEMENT PARTS .......8.0
1.4 Components
1.4.1 The primary components of the monitor are
shown in Figure 1. The instrumentation is enclosed in a
corrosion resistant polypropylene carrying case. The
monitor system includes the instrument case, 10 feet of
1/8" ID x 1/4" OD tubing with fittings, a cylinder of 10 ppm
(parts per million) test gas, calibration connector that
includes the connector valve, tubing, and humidifier.
1.5 Operating Principles
1.5.1 The CMS monitor samples respiratory air from a
breathing-air source. This enables one monitor to detect
CO and other toxic gases in the entire breathing air
system, not just for one respirator. The air to the
respirator does not actually pass through the monitor.
WARNING
When the CMS is correctly installed and
maintained, it monitors the level of CO and
other oxidizable toxic gases in the air supply.
The instrument is a monitoring device; it DOES
NOT remove or convert CO or any other toxic
gases.
Figure 1
CLEMCO
CM
S
-2
10 ppm CO
or
Impurity-Free
Test Gas
Fuse
Audible Alarm
Case Cover
Test Gas Port
Flow Meter
Cover Screw
Case Cover Latch
Tubing
1/4"OD Tube Fitting (2)
This end connects to air source.
Calibration Connector
with Flow-Control Valve
Humidifier
Run/Calibration Switch
Calibration Adjustment
Calibration Indicator
Exterior Alarm Light
120-Volt Power Cord
Calibration Connector Tube End
Plugged Port
for Optional Remote Alarm

CMS-2 CARBON MONOXIDE MONITOR Page 3
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
1.5.2 During operation, a small sample of air, referred
to as sample air, passes through the instrument and is
continuously monitored by the broadband MOS (Metal
Oxide Substrate) sensor. Although the sensor detects
CO, it also detects other oxidizable toxic gases
(hydrocarbons). If the sample-air supply fails for any
reason such as air blockage, loss of pressure, or
excessively high pressure, an intermittent audible alarm
will sound approximately every 10 seconds and the
exterior alarm light will illuminate yellow to alert the user.
1.5.3 In the event the sensor detects CO in the
concentration of 10 ppm or above, a continuous audible
alarm will sound and the exterior alarm light will
illuminate red to alert the user.
1.6 Annunciator Lights and Audible Alarms and
Switches. Use and Functions
1.6.1 Audible and visual alarms are provided on the
exterior of the instrument case and on the interior
faceplate. The exterior light illuminates green when
conditions are safe, or yellow or red depending on the
alarm condition. The audible alarm sounds in
conjunction with the visual alarm.
WARNING
All alarm conditions require the immediate
attention of the user. Stop blasting immediately
and remove the respirator as soon as it is safe
to do so, and check the monitor to determine
the cause for alarm.
1.6.2 The color of the alarm light in conjunction with
the nature of the audible alarm indicates the condition
causing an alarm. Functions of the alarm annunciators
are as follows:
1.6.3 Interior Calibration Light
Red Light - Intermittent Audible Alarm
The interior alarm light (calibration indicator) on the
faceplate of the instrument responds to toxic gas
conditions only. It is for use by the technician during
calibration testing and for calibration when the
instrument case is open.
1.6.4 Exterior Alarm Annunciators
Green Light - No Audible Alarm
No Alarm, Safe Condition: Do not use the
compressed air for breathing unless the exterior light
is illuminated green.
Yellow Light - Intermittent Alarm Horn (approximately
every 10 seconds)
Sample-Air Failure: This alerts the user that
pressure in the test chamber is either too low or too
high. Low pressure is usually due to loss of pressure
in the sample-air air line. High pressure is an
indication that the internal regulator is set too high.
Correct flow is observed on the flow meter; the flow
ball should be between 0.5 and 0.8 SCFH (standard
cubic feet per hour).
Calibration in Process: During calibration testing and
the calibration procedure, this alarm is activated.
The alarm will terminate when the technician has
correctly returned the monitor to service.
Yellow Light - No Audible Alarm
Warm-Up Period: During the first several minutes of
operation, the monitor goes through a warm-up
period while the sensor stabilizes. During the warm-
up period, the yellow light illuminates and all other
alarms are non-operational. The alarm will terminate
after the warm-up is complete.
Red Light - Continuous Audible Alarm
Toxic Gas Detected: This alarm occurs when toxic
gas or CO in excess of 10 ppm is detected in the
breathing air line.
1.6.5 Run/Calibration Switch: The toggle should be in
the RUN position for all operations other than the actual
calibration test and calibration process. If for any reason
the toggle is not in the RUN position, the instrument will
initiate a yellow light and intermittent alarm, indicating
that the sample air is not reaching the sensor. Correctly
positioning the toggle will terminate the intermittent
alarm.
1.7 Optional Accessories
1.7.1 Remote Alarm: The 12-volt DC remote alarm is
a high-intensity, red-lens strobe light and high-decibel
horn. Unlike external alarms, this alarm does not require
an external power source. This accessory is
recommended in high noise areas or where the monitor
cannot be placed in a conspicuous location. The alarm
kit includes the alarm, stand, wiring connector, and 50
foot cable. See Accessories in Section 8.1. With
additional cable, the alarm may be used up to 150 feet
from the monitor. Consult Clemco Industries Corp. if
longer length is required.

CMS-2 CARBON MONOXIDE MONITOR Page 4
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
2.0 SETUP
2.1 Mounting
2.1.1 The CMS-2 does not require any special
mounting, and it will operate in any position. The
carrying case handle may be used to hang the monitor
in a convenient location that is close to the compressed
air source; refer to Section 2.3.
WARNING
DO NOT mount this instrument inside a blast
room. An operator inside a blast room wearing
protective clothing may not observe an alarm
condition. The alarm case is not designed to
withstand the continual impact of abrasive that
takes place inside a blast room. Refer to
instructions within the manual for installing
auxiliary horns, lights, and safety shutdown
devices.
2.2 Air Pressure Requirements
2.2.1 Air Pressure: If the compressed air source
pressure is between 55 psi and 100 psi, no pressure
adjustment is required. If line pressure is above 100 psi,
a regulator is required to reduce pressure to be within
the 55 psi to 100 psi operating range.
2.3 Connecting to Respirator Air Supply
NOTICE
Do not use pipe joint compound to seal pipe
fittings. The monitor will respond to the gases
given off by these compounds. Use Teflon tape
for pipe thread sealer.
Do not use any silicone-based lubricants up-
stream of this instrument. Silicone exposure
will prematurely damage the sensor.
2.3.1 To ensure accurate and rapid air monitoring, the
monitor must be placed as close to the compressed air
source as practical. Ten feet of 1/8" ID x 1/4" OD tubing
with two 1/4" NPT fittings are furnished, to be used
between the compressed air source and monitor inlet.
Larger diameter tubing or pipe, or longer tubing,
increases the air-supply volume, and the volume
determines the length of time it takes for the sample air
to reach the monitor.
2.3.2 Determine a suitable place to tap into the
compressed air supply. The tap location should be within
10 feet of the monitor, and the monitor must be placed in
a location that permits continual observance of the visual
and audible alarms.
Figure 2
CPF Filter
To Respirator
12-Volt Battery or Relay
1/4"NPT Tube Fitting
1/4"OD Tubing
CMS-2
1/4"OD Tubing
1/4"OD Tubing
1/4"NPT Tube Fitting
1/4"NPT Tube Fitting
1/4"NPT
Tube Fitting
Drop Line
Power Cord Drain
Power Cord
1/4"NPT
Tube Fitting
Isolation Valve
Isolation Valve
Compressed-Air Line
Compressed Air Line
CMS-2
Converted to 12 volt.
Power Cord
To Respirator

CMS-2 CARBON MONOXIDE MONITOR Page 5
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
WARNING
The monitor or an auxiliary alarm must be in a
conspicuous place to ensure that any alarm
condition is observed. Using the auxiliary
terminals and a relay, the monitor may be
interlocked with other devices such as the
compressor shut-down, as an additional
safeguard against an unobserved alarm.
2.3.3 Place a tee in the air-supply line, and use a
bushing or other adaptor, to connect one of the 1/4" NPT
tube fittings supplied. Install an isolation valve at the
source to enable depressurization for service and to
remove the monitor. Typical setups are shown in Figure 2.
2.3.4 The tee in the air-supply line should face up to
prevent water from accumulating in the sample–air line.
If the tap cannot face upward, install a drop pipe and
drain to prevent water from entering the monitor.
2.3.5 Connect the other 1/4" NPT tube fitting to the
monitor’s inlet port.
2.3.6 Attach the urethane tubing between the air-
supply tube fitting and monitor-inlet tube fitting. Remove
excess tubing.
2.4 Electrical Connections
2.4.1 120-Volt AC supply: A 120-volt AC power cord
is supplied and can be plugged into a compatible AC
grounded electrical service.
2.4.2 220-Volt AC, 50/60-Hz supply: The only
difference between a 120-volt and 220-volt monitor is the
power cord. Remove the 120-volt cord or plug and
replace it with one that is compatible with a grounded
220-volt receptacle.
2.4.3 12-Volt DC supply: A DC monitor model is
available from Clemco, or an AC monitor is easily field
converted to operate on 12-volt DC, as noted in Section
2.4.4.
2.4.4 AC to DC field conversion (Serial No. 4446
and greater)
To convert monitors with serial numbers lower than 4446,
request Manual No. 22925, Revision E or earlier.
The AC power cord provided with the monitor may be
used, using black as the positive. A user supplied DC 2-
wire cord may be used, using red as positive. If a new
12-volt cord is used, splice the positive through the fuse
and use the spade on the outlet of the fuse to connect to
the positive terminal, as shown Figure 3.
2.4.4.1 Make sure that all electrical power to the monitor
is disconnected.
2.4.4.2 Open the case to access the interior faceplate.
2.4.4.3 Loosen the cover screw located in the center of
the lower edge of the faceplate. Refer to Figure 1.
2.4.4.4 Swing the faceplate up to access the
instrumentation.
2.4.4.5 Remove the connector with red and black wires
from the plug on the circuit board, as shown in Figure 3.
If there is a chance the monitor will be converted back to
AC power, tie the wires out of the way. If the monitor is
to be permanently converted to 12 volts, pop off the
clear terminal cover and remove the wires from the
terminal.
2.4.4.6 Disconnect the white and black wires from the
power supply lead wires at the connectors, as shown in
Figure 3.
2.4.4.7 Plug the black wire onto the DC+ post at the
lower left corner of the circuit board, as shown in Figure 3.
Note the board is upside down when the cover is open.
Plug the white wire onto the DC- post.
Some items removed or rotated for clarity.
Figure 3
2.4.4.8 Remove the plug from the other end of the cord.
DC
DC+
Green Ground Wire
Fuse Assembly
Remove connector.
Connector Plug
Lead Wires
The green ground wire may remain connected or clipped
when usin
g
the AC cord for DC a
pp
lications.
Tie off or
remove wires.
Power Supply
Circuit Board
White wire to DC
Black wire to DC+
Disconnect white and
black wire from
power supply leads.

CMS-2 CARBON MONOXIDE MONITOR Page 6
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
2.4.4.9 When closing the faceplate, make sure all internal
air lines are free of interference, binding, or kinks and that
all tube connections are secure. Tighten the cover screw.
2.4.4.10 Close the instrument case cover and latch it.
2.4.4.11 Attach a positive (+) terminal connector to the
end of the black wire and a negative (-) connector to the
end of the white wire. Clip the green wire.
NOTICE
Use any connectors that are compatible with a
12-volt DC system. Make sure the connectors
are clearly marked positive (+) and negative (-).
Attach the positive connector to the wire
leading to the DC+ post on the circuit board,
and the negative connector to the DC- post on
the circuit board. The monitor will not operate if
wires are reversed.
2.5 Connecting an External Alarm and Shutdown
Device ‒Figure 4
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.
Figure 4
2.5.1 A dry relay contact, rated at 5 amperes, is
mounted on the circuit board as shown in. Figure 4. An
electrician will use the contacts to operate relays for
external alarms and shut-down devices.
2.6 Changing Mode Select Dip Switch to Delay
Alarm ‒Figure 5
NOTE: In areas where intermittent radio frequency
transmissions cause false alarms, the monitor can
be set to have a 10 second alarm delay to avoid false
alarm conditions. The dip switch is mounted on the
circuit board as shown in Figure 5.
WARNING
Do not change the switch positions unless there
are frequent alarms from radio frequency (RF)
transmissions. Do not change the switch
positions to any position other than noted in
Figure 5. Avoid unnecessary tampering with the
circuit board; doing so can change the monitor’s
settings, which can affect CO alarm conditions.
2.6.1 The default and recommended setting has no
delay in alarm-response time. The positions of the white
mode-select switches are shown on the upper example
in Figure 5 and as follows:
Switch #1 .....Off
Switch #2 .....On
Switch #3 .....Off
2.6.2 To delay the alarm by 10 seconds, set the white
mode-select switches as shown on the lower example in
Figure 5 and as follows:
Switch #1 .....Off
Switch #2 .....Off
Switch #3 .....Off
Figure 5
Com
NC
NO
Auxiliary Alarm
Typical wiring for normally open alarm
Remote Alarm Plug
Do not connect external
alarms to this plug. This is for
the optional remote alarm
only.
ON
1
2
3
Default Mode, No Delay
Switch #1 Off
Switch #2 On
Switch #3 Off
10 Second Alarm Delay
Switch #1 Off
Switch #2 Off
Switch #3 Off
Dip Switch
ON
1
2
3
Dry Relay Contact
Com
NC
NO
L1
L2 +

External
Power

CMS-2 CARBON MONOXIDE MONITOR Page 7
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
3.0 OPERATION
WARNING
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
test air to the monitor.
3.1.3 Plug the instrument into a grounded 120-volt AC
power supply. If the monitor is converted to operate on
12-volt power, connect to a 12-volt DC power source; be
certain the positive and negative leads go to the correct
terminal. There is no on/off switch on the monitor; it will
initiate operation as soon as power is applied.
3.2 Warm-Up Period
3.2.1 With electrical power applied and 55 psi to 100
psi sample air supplied to the inlet, the monitor will go
through a five minute warm-up period.
3.2.2 During the warm-up period, the audible alarms
are disabled and the external visual alarm is yellow. At
the end of the warm-up period, the yellow exterior light
turns green, indicating that the instrument is functioning
and the sample air does not exceed the contamination
limit. NOTE: If the instrument has been off for a
prolonged period, it is normal for the alarms to
activate for a short period of time after the warm-up
cycle.
3.2.3 Make sure alarms function per Section 5.5. If the
alarms function as described, proceed to place the
instrument in operating mode, per Section 3.3.
3.2.4 If the instrument goes into an alarm (exterior
light remains red with continuous audible alarm) after
the warm-up, reinitiate warm-up by terminating and
restarting power.
3.2.5 Continued alarm condition after several warm-
up periods indicates that the sample air exceeds the
permissible contamination level or the instrument
requires calibration. Refer to Section 4.0.
WARNING
DO NOT use the respirator during the warm-up
period. The alarms are disabled and will not
warn against toxic gases.
3.3 Operating Mode
3.3.1 Following the warm-up period, with the toggle
correctly positioned to RUN and the sample air flowing
through the unit, the monitor is in full operating mode.
3.3.2 Before donning the respirator, verify that the
monitor is in the operating mode; the exterior alarm light
must be green with no audible alarm.
WARNING
Do not use compressed air monitored by this
instrument for breathing without first checking
that the instrument is in full operating mode,
and the that exterior alarm light is illuminated
green. Failure to heed this warning can cause
death from the inhalation of CO.
3.4 Shutdown
3.4.1 If the instrument is not to be moved and is
protected from the weather, simply shut off the isolation
valve and unplug the power cord. If the unit is to be
transported or if it is not protected from the weather,
proceed as follows:
3.4.2 Watch the flow meter; when air flow stops,
remove the urethane tubing from the supply line and
monitor inlet. The tubing is easily removed by pushing in
the tube fitting ring while pulling the tubing.
3.4.3 Coil the tubing and place it inside the instrument
case to keep the tubing clean.
3.4.4 Place tape or other cover over the inlet fitting to
keep instrumentation clean.
3.4.5 Transport the instrument in the passenger
compartment of the service vehicle, not in the trunk or
truck bed. See Care and Handling in Section 5.1.

CMS-2 CARBON MONOXIDE MONITOR Page 8
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
4.0 CALIBRATION TEST AND CALIBRATION
NOTE: Thoroughly review and understand the
calibration testing and the calibration process
before testing or calibrating the instrument. Refer to
Section 4.1.
WARNING
This instrument must be tested and calibrated
with 10 ppm test gas. Do not test or calibrate
with any other test gas concentration. Doing so
will place the monitor out of calibration and
may fail to alert the user of toxic gases.
Breathing toxic gases can cause death.
4.1 Difference Between Calibration Test and the
Calibration Process
4.1.1 It is important to understand the difference
between calibration testing and the calibration process.
4.1.2 Calibration test: Calibration testing means
applying 10 ppm test gas to the instrument to make sure
it responds with an alarm when CO concentration
reaches the maximum permissible exposure level, and
that it responds with a safe signal when impurity-free air
is applied. Calibration test does not include any
adjustment of the instrument. Calibration (adjustments)
should be done only when the calibration test shows it is
necessary.
4.1.3 Calibration process: Calibration means
adjusting the instrument. Calibration should be done
only when the instrument does not respond during
calibration testing or when it remains in alarm at startup.
4.2 Materials Required for Tests and Calibration
10 ppm test gas...............................Stock No. 22865
Impurity-free test gas (when required,
see Section 4.9) ...........................Stock No. 11132
Calibration connector.......................Stock No. 22893
Distilled water
Small adjusting screwdriver
(when calibration is required)
4.3 Stabilization Period
4.3.1 The monitor must be in operation for at least 30
minutes before calibration tests. DO NOT test the
instrument until it has gone through the warm-up period
and has been in operation with sample air flowing
through it (see Section 3.0) for at least 30 minutes.
4.4 Prepare Calibration Connector
NOTE: Unlike ambient air, calibration test gas is
bone-dry. Attempts to test or calibrate the monitor
without humidifying the test gas will cause
significant reading errors of compressed air with
normal levels of humidity.
4.4.1 Before connecting the humidifier to the
calibration connector, dampen the humidifier media with
distilled water (do not use anything other than distilled
water) as follows:
4.4.2 Open the humidifier case by holding the
assembly and rotating the top counterclockwise, as
shown in Figure 6.
NOTE: The O-ring on the bottom case provides a tight
friction seal; use hand force to rotate and separate the
humidifier top and bottom cases. Do not use tools that
could crack the case.
Figure 6
4.4.3 When in the unlocked position, pull the top
straight UP to remove the top and access the humidifier
sponge.
4.4.4 Moisten the sponge by putting in a few drops of
distilled water, as shown in Figure 7. Shake out excess
water. The humidifier needs only to be dampened;
excess water must be removed so that it does not enter
the instrument’s plumbing.
4.4.5 Refer to Figure 7 and reassemble the humidifier
by aligning the bottom-case lock stubs and top-case
slots, push them together, and rotate the top clockwise
to secure.
4.4.6 Refer to Figure 8 and insert the humidifier’s tube
connector into the slide release until it snaps in place.
Gently pull the connector to make sure it is seated and
locked.
Case Top
Case Bottom
Closed, Locked
Open, Unlocked
Open
Close
Humidifier

CMS-2 CARBON MONOXIDE MONITOR Page 9
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
Figure 7
4.4.7 Make sure the flow-control knob is turned fully
clockwise to the CLOSED position.
4.4.8 Thread the calibration connector onto the
cylinder of test gas. (Use 10 ppm CO test gas to check
the calibration or to calibrate the monitor. Use zero,
impurity-free air to check if alarm is due to contaminated
air or other condition).
Figure 8
4.5 Prepare Monitor for Calibration ‒Figure 9
4.5.1 Open the instrument case cover to access the
interior faceplate. Take care not to introduce blast
environment contaminants into the instrument when the
case is open. Refer to Figure 10 for faceplate-calibration
testing and calibration callouts.
Figure 9
4.5.2 Connect the tubing’s bayonet connector to the
Test Gas port by aligning the tabs, insert the connector
into the port, and turn it slightly clockwise until it locks.
4.6 Calibration Test
4.6.1 Connect the calibration connector and test gas
per Sections 4.4 and 4.5.
4.6.2 Place the Run/Calibration toggle toward
CALIBRATION. The external alarm light will immediately
turn yellow, and within a few seconds the intermittent
audible alarm will sound (the calibration indicator
remains green).
4.6.3 With the flow meter vertical, refer to Figure 9
and slowly open the flow-control knob to introduce test
gas. Test gas is entering the unit when the flow meter
ball rises. If the ball does not rise when the calibration
valve is opened, the test gas cylinder may be empty.
4.6.4 Refer to Figure 10 and adjust the flow-control
knob until the flow meter ball remains between 0.5 and
0.8 SCFH, normally a little nearer to 0.8. The valve is
extremely sensitive. Minor adjustments may be required
to correctly position the ball.
RUN
CALIBRATION
Calibration
Indicator
Calibration
Adjustment
Test Gas
Port
Adjust
potentiometer
through this port. Position toggle
toward calibration
Flow Meter Ball
Connects from test gas.
Calibration Connector
Tubing Bayonet Connector
Test Gas
Tubing Connector
Insert connector into slide
release until it sna
p
s into
p
lace.
Flow-Control Knob
Turn fully clockwise to close.
Slide Release
Push in to release
the tubing connector.
Humidifier-Case Top
Distilled water only.
Lock Stub Humidifier-Case Bottom
Humidifier Sponge
Lock Slot

CMS-2 CARBON MONOXIDE MONITOR Page 10
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
Figure 10
4.6.5 Allow test gas to flow through the instrument for
about one minute, or until the interior calibration
indicator light turns red.
4.6.6 After the calibration light turns red, the initial
phase of the calibration test is complete. Return the
instrument to operating mode per Section 4.8. If the
indicator light does not turn red, proceed with Paragraph
4.6.7.
4.6.7 If after one minute of operation with test gas the
calibration indicator light has not turned red and the
instrument has been in operation for 30 minutes,
calibrate the instrument per Section 4.7. If the instrument
has not been in operation for 30 minutes, return it to
operating mode per Section 4.8 and operate with
sample air flowing through for at least 30 additional
minutes. Re-test the calibration, and if the calibration
light does not turn red, calibrate the instrument per
section 4.7.
4.7 Calibration
4.7.1 Do not calibrate the instrument unless it has
gone through two stabilizing periods and calibration
tests, per Sections 4.3 and 4.6, and only if the calibration
indicator light has not turned red.
4.7.2 Connect the calibration connector and 10 ppm
test gas per Sections 4.4 and 4.5.
4.7.3 Place the Run/Calibration toggle toward
CALIBRATION. Slowly open the flow-control knob and
adjust the flow so the flow ball remains between 0.5 and
0.8 SCFH (normally a little nearer to 0.8).
4.7.4 Allow test gas to flow through the instrument for
about one minute. Insert a small screwdriver into the
calibration adjustment port and turn the potentiometer as
follows:
If the potentiometer is blue,turn clockwise until the
calibration indicator light turns red.
If the potentiometer is white, turn counterclockwise
until the calibration indicator light turns red.
4.7.5 Once the indicator is red, turn the potentiometer
in the opposite direction until the light turns green. Then,
slowly turn the potentiometer from green to red several
times to find the trip point. The monitor is calibrated at
the spot where the light turns red. Return the instrument
to operating mode per Section 4.8.
4.8 Return Monitor to Operating Mode
4.8.1 Turn the flow-control knob counterclockwise to
close the calibration-connector valve.
4.8.2 Remove the calibration tubing from the monitor
by gripping the tube-end connector, push in lightly, turn it
counterclockwise to unlock, and pull straight out.
4.8.3 Place the calibration toggle toward the RUN
position. The flow meter ball should rise to 0.5 to 0.8
SCFH. After several seconds the external alarm light
should change from yellow to green, and the interior light
should change to green. If the lights respond as
described, proceed with Section 4.8.4 to return the
instrument to operation. If after about one minute of
operation the lights do not change to green, do both of
the following:
Calibrate the instrument, per Section 4.7.
Test instrument function by applying impurity-free
air, per Section 4.9.
4.8.4 Close and latch the instrument case cover.
4.8.5 Remove the calibration connector from the test
gas. The test gas cylinder has a positive seal, whereas
the calibration connector valve does not. NOTE: If the
connector is not removed from the test gas cylinder,
over time the cylinder will empty.
4.8.6 If the tubing needs to be removed from the
calibration connector, press and hold the slide-release
fitting and gently pull the tubing connector from the
fitting.
4.8.7 Store all material in a clean, dry area.
4.9 Impurity-Free Air (zero contamination) Test
4.9.1 This test should be done whenever the
instrument stays in an alarm condition after it is returned
to the operating mode. This test shows whether the
alarm condition is due to contaminated air or monitor
malfunction.
CLOSE
OPEN
Calibration Connector
Flow-Control Knob
Turn fully clockwise to close.

CMS-2 CARBON MONOXIDE MONITOR Page 11
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
4.9.2 Follow the steps in Section 4.6 Calibration
Testing, except use impurity-free test gas in place of 10
ppm gas. The alarm light will either remain red or turn
green. Proceed as follows:
4.9.3 Alarm light turns green
4.9.3.1 If the monitor is correctly calibrated and in
working order, the alarm light will turn green during this
test. This means the monitor was reading contaminated
air. DO NOT USE THE COMPRESSED AIR FOR
BREATHING.
WARNING
Do not breathe air that this instrument identifies
as toxic until the source of contamination is
identified and corrected. Breathing toxic gases
can cause death.
4.9.3.2 Identify the source of contamination. Do not
overlook the possibility that contaminated air entered the
compressor intake. The contamination could be from
engine or other exhaust entering the intake. If the source
of contamination is temporary, the monitor will return to
a non-alarm (safe) condition after the contamination is
cleared from the compressed-air system.
4.9.4 Alarm light remains red
4.9.4.1 If the monitor is out of calibration or not in good
working order, the alarm light will remain red.
4.9.4.2 Calibrate the monitor per Section 4.7 and apply
impurity-free gas per Section 4.9. If the alarm light
remains red, the monitor requires service. Refer to
Section 6.0.
WARNING
Do not use compressed air monitored by this
instrument for breathing unless the instrument
is in good working condition. Using a monitor
that is not in calibration or not working
correctly can permit undetected CO to enter the
breathing-air lines. Breathing toxic gases can
cause death.
5.0 GENERAL MAINTENANCE
5.1 Care and Handling
5.1.1 This monitor is designed for portable, field use
and is not adversely affected by normal handling that is
required of any test and measurement instrument.
5.1.2 Transport the instrument in the passenger
compartment of the service vehicle.
NOTICE
Do not subject this instrument to extreme heat or
cold. Placing the instrument on the dashboard of
the service vehicle in direct sunlight or similar
conditions will elevate the temperature, which
will damage the instrument’s electronic
components. Temperatures at 0o F and below or
case temperature at 125o F and above will
damage the instruments components.
5.2 Cleaning
5.2.1 The need to open the case periodically to
calibrate the instrument exposes it to potential external
contamination. Take care not to introduce contaminants
into the instrument when the case is open.
5.2.2 Clean the exterior of the case with a solution of
water and mild detergent. Do not use solvent cleaners.
5.3 Calibration Test Schedule
5.3.1 Test the calibration when it is initially set up and
again the day after. Check it once a week for the first
month. Check it at least once a month thereafter. Refer
to Section 4.0 for test procedure.
5.4 Calibration Schedule
5.4.1 Avoid the urge to calibrate the instrument.
Calibrate only when the calibration test shows it is
required. See Section 4.0.
5.5 Alarm Tests
5.5.1 Although uncommon, alarm lights and horns do
fail. Check their function before each use by placing the
Run/Calibration toggle toward CALIBRATION. The
external alarm light will immediately turn yellow, and
within a few seconds the intermittent audible alarm will
sound. Placing the toggle in RUN position returns the
alarms to their normal operation. Never use the
respirator without first verifying that the monitor is
in the operating mode; the exterior alarm light must
be green with no audible alarm.

CMS-2 CARBON MONOXIDE MONITOR Page 12
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
6.0 SERVICE MAINTENANCE
NOTE: Do not attempt to repair the instrument or
replace any item that is not noted in this section or
that requires parts not listed in Section 8.2. Contact
a Clemco distributor for authorization to return the
instrument for evaluation or service.
6.1 Sensor Replacement
6.1.1 Sensor life depends upon several factors, but in
most cases the sensor should last two to three years.
6.1.2 The following materials are required before
replacing the sensor:
10 ppm test gas...............................Stock No. 22865
Calibration connector.......................Stock No. 22893
Sensor..............................................Stock No. 22919
Standard screwdriver
6.1.3 Open the instrument case to access the interior
faceplate. Take care not to introduce contaminants into
the instrument when the case is open.
6.1.4 Loosen the closing screw located in the center
of the lower edge of the faceplate.
6.1.5 Using the top hinge as the pivot, swing the
faceplate up to expose the instrumentation.
6.1.6 Locate the clear-plastic sensor housing, shown
in Figure 11, and while supporting the circuit board,
loosen the two mounting screws.
Figure 11
6.1.7 Carefully pull straight up to lift the sensor
housing off the circuit board. The sensor may come off
with the housing or stay plugged into the board.
6.1.8 If the sensor remains on the circuit board, note
the location of the small tab, as the new sensor must be
installed in the same orientation. While supporting the
circuit board, carefully pull straight up to remove the
sensor.
6.1.9 If the sensor comes off with the housing, note
the tab location and remove the sensor by pulling on a
couple of the sensor pins.
6.1.10 Discard the old sensor to avoid attempts to
reuse.
6.1.11 Handle the new sensor taking care not to distort
the pins. Rotate the sensor so the tab is in the same
position as was the old one (as shown in Figure 11) and
plug the pins into the socket. Some pin alignment may
be required, and is normal. Push firmly but carefully to
seat the sensor. The sensor will stand off the circuit
board by approximately 1/4" when seated.
6.1.12 Place the sensor housing over the sensor, align
the mounting screw holes, and while supporting the
circuit board, tighten the screws snugly but Do not
overtighten as it could damage the board.
6.1.13 When closing the faceplate, make sure that all
internal air lines are free of interference, binding or
kinks, and that all tube connections are secure. Tighten
the closing screw.
6.1.14 Close the instrument case and apply sample air
and power per section 3.0, and allow the monitor to run
in operating mode for at least one hour.
6.1.15 Calibrate the monitor per Section 4.0.
6.1.16 Return the monitor to service and record sensor
replacement date.
6.1.17 Follow the calibration testing schedule per
Section 5.3.
6.2 Fuse Replacement
6.2.1 The fuse cap is located on the side of the
instrument case. To access the fuse, push the cap in
and rotate counterclockwise.
Sensor Housing
Sensor
Note tab
position.
Mounting
Screws

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.

CMS-2 CARBON MONOXIDE MONITOR Page 14
© 2018 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 22925, Rev. I, 04/18
8.0 ACCESSORIES AND REPLACEMENT PARTS
8.1 Accessories
Item Description Stock No.
(-) Remote alarm kit, includes: alarm, stand,
wiring connector and 50 ft. cable ...........22909
(-) Cable, 50 ft. remote alarm extension ........22910
8.2 Replacement Parts ‒Figure 12
Item Description ...........................................Stock No.
(-) CMS-2 CO monitor package,
includes: monitor, calibration connector,
and 10 ppm test gas
120-volt AC .............................................22894
12-volt DC ..............................................25024
120-volt AC monitors can be field converted to
12-volt DC. Refer to Section 2.4.
(-) CMS-2 CO monitor only, includes:
CO monitor and items 4 through 10
120-volt AC..........................................22892
12-volt DC ...........................................25072
120-volt AC monitors can be field converted to 12-volt
DC. Refer to Section 2.4.
1. Calibration connector assembly, includes:
tube, humidifier, and flow-control
valve with connector ...............................22893
2. Test gas
10 ppm ...................................................22865
Impurity free ...........................................11132
3. Tubing, clear for Item 1 and internal,
per ft., specify length required ................29261
4. Regulator/filter, M5 ....................................22920
5. Filter element, replacement for Item 5 ......22921
6. Flow meter .................................................21376
7. Horn w/ wire and connector, 12-volt DC....22922
8. Alarm light, exterior w/ wire and connector...22923
9. Fitting, 1/4-NPT x 1/4" OD tube .................22924
10. Tubing, urethane,
per foot, ten feet required .......................12475
(-) Power supply, 120/220 AC to 12-v. DC ....28011
(-) Sensor (not shown) ...................................22919
(-) Orifice, .004 purple restrictor (not shown)..24423
(-) Orifice, .006 red restrictor (not shown) .....24424
(-) Fuse, 1-amp (not shown).......... purchase locally
Figure 12
1
2
4
5
6
7
8
9
9
10
3