Clemco CMS-3 User manual

CMS-3
IN-HELMET CARBON MONOXIDE MONITOR
O. M. 24658
© 2015 CLEMCO INDUSTRIES CORP.
One Cable Car Dr.
Washington, MO 63090
Phone [phone]
Fax [phone]
Email: [email protected]
www.clemcoindustries.com
DATE OF ISSUE: January 2011
REVISION: D, 04/15
Do not use this
equipment until you
have READ this
MANUAL and YOU
UNDERSTAND its
contents. *
These WARNINGS are
included for the health
and safety of the
operator and those in
the immediate vicinity.
*If you are using a Clemco Distributor
Maintenance and Parts Guide, refer to
the orange warnings insert preceding
the Index before continuing with the
enclosed instructions.
Electronic files include a Preface
containing important information.
WARNING

CMS-3 IN-HELMET CARBON MONOXIDE MONITOR Page 1
© 2015 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 24658, Rev. D
1.0 INTRODUCTION
1.1 Scope of Manual
1.1.1 These instructions cover operation, maintenance,
troubleshooting and replacement parts for the CMS-3
Respirator-Mounted Carbon Monoxide (CO) Monitor.
1.1.2 The monitor is intended to detect the presence
of CO inside Apollo supplied-air respirators, where the
maximum CO exposure limit in the USA is 10 parts per
million (ppm). This is the limit set to meet the
requirement for Grade D quality breathing air. The
monitor also has short-term exposure limit (STEL) and
time-weighted average (TWA) features that enable its
use as an ambient air monitor. Instructions on toggling
through the STEL and TWA are explained in Section 3.3.
1.1.3 All respirator users and those responsible for
maintenance and calibration of the monitor must read
and understand this manual before using the respirator
or operating with the monitor.
1.1.4 NIOSH (National Institute of Occupational Safety
and Health) has approved the use of the CMS-3 with
Clemco respirator models Apollo 20, 60, and 600.
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.
W
ARNING
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
Topic Page Section
Specifications .............................................. 2 ......... 1.4
Description of Operation .............................. 2 ......... 1.5
Ancillary Equipment Requirements ............. 2 ......... 1.6
Components and Functions ..................... 2 ..........1.7
Case ........................................................ 2 ...... 1.7.1
Sensor Cap and Sensor Cover ............... 2 ...... 1.7.2
Charcoal Filter Disc ................................ 2 ...... 1.7.3
Sensor .................................................... 2 ...... 1.7.4
LCD ......................................................... 3 ...... 1.7.5
Control Buttons ....................................... 3 ...... 1.7.6
Alarm-Lights ............................................ 3 ...... 1.7.7
Audible Alarm ......................................... 3 ...... 1.7.8
Vibrator Alarm ......................................... 3 ...... 1.7.9
Lithium Battery (a spare is included) ....... 4 .... 1.7.10
Setup, Start Up and Operation
Installation in Apollo 20 ............................4 ........2.1.1
Installation in Apollo 60 and Apollo 600 ...4 ........2.1.2
Turning ON and Start-up Procedure ........5 ..........2.2
Performing a Fresh Air Adjustment .........5 .......2.2.4
Process shown under calibration
Turning Off the CMS-3 .............................5 ..........2.3
Operation
Measuring Mode ......................................5 ..........3.1
Displaying Peak Gas Concentrations ......5 ..........3.2
Displaying STEL, & TWA .........................6 ..........3.3
Alarms ......................................................6 ..........3.4
Responding to Alarms .............................6 ..........3.5
Displaying and Setting Alarm Points .......8 ..........3.6
Setting the Clock ......................................9 ..........3.7
Calibration
Calibration Schedule ................................9 ...........4.1
Setting the Fresh Air Reading .................9 ..........4.2
Calibration ............................................. 10 ..........4.3
Maintenance
Replacing the Lithium Battery ............... 11 ..........5.1
Replacing the Sensor ........................... 11 ..........5.2
Replacing the Sensor Cover ................. 12 ..........5.3
Replacing the Charcoal Filter Disk ....... 12 ..........5.4
Troubleshooting ......................................... 13 ..........6.0
Accessories and Replacement Parts ........ 14 ..........7.0

CMS-3 IN-HELMET CARBON MONOXIDE MONITOR Page 2
© 2015 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 24658, Rev. D
1.4 Specifications
Target Gas .................Carbon Monoxide (CO)
Detection Range ........................ 0 to 500 ppm
Display Increment .................................1 ppm
CO Sensor ...........................Electro Chemical
Alarm Point, Low .................................10 ppm
Alarm Point, High ................................10 ppm
1.5 Description of Operation
W
ARNING
The CMS-3 detects carbon monoxide which can
be life threatening. When using the CMS-3,
follow the instructions and warnings in this
manual to assure proper and safe operation of
the unit and to minimize the risk of personal
injury. Carbon monoxide poisoning could result
in death or serious injury.
1.5.1 The CMS-3 respirator-mounted carbon
monoxide monitor detects the presence of carbon
monoxide (CO) inside a supplied-air respirator.
1.5.2 The current maximum exposure limit in the USA
for carbon monoxide in Grade D compressed breathing
air is 10 parts per million (ppm). Users outside the USA
should determine their local requirements and set the
alarm threshold to their maximum PEL per Section 3.6. If
CO concentrations reach the exposure limit, three
alarms occur. The audible alarm beeps twice per
second, the alarm-lights flash twice per second, and the
unit vibrates. If an alarm occurs, remove the respirator
as soon as it is safe to do so.
1.5.3 The CMS-3 offers a full range of features,
including:
Digital liquid crystal display (LCD)
Visual, audible, and vibrating alarms
Low battery alarm
Sensor fail alarm
Current time display
Over 3,000 hours of operation from 1 battery
CSA classified for Class I, Division I, Groups A, B,
C, and D hazardous atmospheres
* Peak, STEL, and TWA indication
* STEL, TWA, and over range alarms
*Refer to notation in Paragraph 1.5.4, regarding
usage of STEL and TWA. Refer to Section 3.2 for
information on the Peak Display.
1.5.4 TWA and STEL: TWA is an acronym for time-
weighted average, and it is the average reading of CO
during the last eight hours. STEL is an acronym for
short-term exposure limit, and it is the average reading
of CO during the last 15 minutes. Although some may
find TWA and STEL information useful, it is not pertinent
for supplied-air respirator use, because the maximum
exposure limit for Grade D breathing air is 10 ppm.
1.6 Ancillary Equipment Requirements
1.6.1 In addition to the monitor, the following
equipment is required to operate and maintain the CMS-
3 Monitor.
Calibration connector with tubing and calibration
cup: Stock No. 25572.
25 PPM Test Gas: Stock No. 25573.
1.7 Components and Functions
The components include the case, sensor cap, sensor
cover, charcoal filter disk, sensor, LCD, control buttons,
printed circuit boards, alarm-lights, audible alarm,
vibrator, and lithium battery. Callouts shown in Figure 1
are items needed to perform routine functions.
1.7.1 Case: The digital LCD is visible through the top
case. It displays gas concentrations, battery level, time,
and other readings including TWA, STEL, and peak gas
levels. Below the LCD are two black control buttons. The
button on the left is labeled POWER/MODE. The button
on the right is labeled AIR. To the left of the LCD is the
audible alarm, which is located inside the case. To the
right of the LCD is the sensor cap which retains the
sensor. Above the LCD is a lens through which the
alarm-lights are visible. The battery cover is located on
the back of the case and is held in place by two screws.
1.7.2 Sensor Cap and Sensor Cover: The sensor
cap snaps onto the right side of the case and retains the
sensor. It also retains the sensor cover which is a round
hydrophobic disk membrane which protects the sensor
from dirt and elements. A molded gasket installed on the
sensor, seals the sensor, sensor cover, and sensor cap.
1.7.3 Charcoal Filter Disk: A charcoal filter disk is
located in a recessed area of the sensor gasket beneath
the sensor cover. The charcoal filter disk removes gases
from the sampled air that will cause a response on the CO
sensor, gases such as hydrogen sulfide (H2S) and certain
hydrocarbons. If false or elevated CO readings are
noticed, especially in the presence of H2S, change the
charcoal filter disk. Refer to the maintenance Section 5.4.
1.7.4 Sensor: The sensor is protected by the white
sensor cover which is held in place by the sensor cap
and sensor gasket. The sensor cover allows air to
diffuse past it to the sensor. A gas permeable membrane
covers the sensor face and allows gas to diffuse into the
sensor. The gas reacts in the sensor and produces a
current proportional to the concentration of carbon
monoxide. The current is amplified by the CMS-3’s
circuitry, converted to a measurement of gas
concentration, and displayed on the LCD.

CMS-3 IN-HELMET CARBON MONOXIDE MONITOR Page 3
© 2015 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 24658, Rev. D
Figure 1
1.7.5 LCD: The LCD is visible through the top case.
CO concentrations, the time, battery condition, and
alarm indications are displayed on the LCD. Once the
monitor is ON, pressing the Power/Mode or Air control
button, turns on the LCD backlight for 20 seconds.
1.7.6 Control Buttons: Below the LCD are the two
control buttons. They are POWER/MODE and AIR. They
turn on the power to the CMS-3 and turn it off. They
control what is displayed on the LCD, including time, gas
concentrations, peak, TWA, and STEL readings, as well
as other messages. They also allow for a fresh air
adjustment, change alarm points, change the time, and
calibrate the instrument. The functions performed by the
control buttons are summarized in the table in Figure 2.
1.7.7 Alarm-Lights: Two LED alarm-lights are located
above the LCD. The red alarm-lights show through the
reflective lenses. The red LED’s alert the user to CO
gas, low battery, and sensor failure.
1.7.8 Audible Alarm: An opening on the left side of
the top case allows the alarm’s sound (a beep) to
resonate from the case. The alarm sounds for CO gas,
unit malfunctions, low battery, and as an indicator during
normal use of various display options.
1.7.9 Vibrator Alarm: A vibrating motor mounted
inside the case vibrates momentarily during the power-
up sequence and for CO gas alarms.
Button Function
POWER/MODE
Turns the unit on and off
Turns the LCD back light on.
(when unit is on)
Displays STEL and TWA
readings.
Displays peak (high) readings
Resets the alarm circuit (gas
alarms).
Enters Calibration Mode when
used with the AIR button.
Enters Alarm Adjustment Mode
when used with the AIR button.
Enters Time Adjustment Mode
when used with the AIR button.
AIR
Turns the LCD back light on.
(when unit is on)
Adjusts LCD readings when the
fresh air adjustment is performed.
Enters Calibration Mode when
used with POWER/MODE button.
Enters Alarm Adjustment Mode
with the POWER/MODE button.
Enters Time Adjustment Mode
with the POWER/MODE button.
Increases settings when the unit
is in Alarm Adjustment Mode,
Time Adjustment Mode, or
Calibration Mode.
Figure 2
LCD Display Window
Audible Alarm Opening Sensor Diffusion Port
Sensor Cap
Control Buttons
LED Alarm-Lens
Sensor Cap
Sensor Cover
Charcoal Filter
Sensor
Sensor Alignment Slots
Mounting Plate and Clip
Clip not used with
respirator mounting Velcro®Hook Fastener Tape
Sensor Gasket
Velcro®Loop Fastener Tape

CMS-3 IN-HELMET CARBON MONOXIDE MONITOR Page 4
© 2015 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 24658, Rev. D
1.7.10 Lithium Battery: A 3.0 volt coin type lithium
battery powers the CMS-3. The battery will run the
monitor for approximately four months when no alarms
have been activated during that time period. The battery
icon on the LCD shows the charge remaining in the
battery. When the CMS-3 detects low battery voltage, a
low battery warning (the last remaining bar on the
battery icon flashes) is activated. There may be
conditions that cause rapid deterioration of a low battery.
A spare battery is provided with the monitor; keep a
new battery on hand at all times. When the battery is
too low for normal operation, a dead battery alarm
(battery icon flashes, audible alarm beeps twice per
second) is activated. Refer to Section 5.1 for instructions
on replacing the battery.
2.0 INSTALLATION, START-UP and SHUT-OFF
2.1 Installation
This section explains the initial installation of the CMS-3
inside the respirator.
2.1.1 Installation in Apollo 20 Respirator
Refer to Section 2.1.2 for installing the monitor in Apollo 60
and Apollo 600 respirators.
2.1.1.1 Open the lens frame and remove the lenses.
2.1.1.2 Don the helmet and temporarily place the monitor
on one of the side walls of the window extension, as
shown in Figure 3.
2.1.1.3
Mark the location and remove the monitor and helmet.
Figure 3
2.1.1.4 Remove backing from the Velcro®hook tape and
adhere it at the marked location (the loop tape adheres to
the monitor). Attach the monitor so the control buttons
face toward lenses and alarm-lights toward the inside of
the respirator. Don the helmet to make sure the monitor’s
alarm-lights are visible from inside the helmet.
2.1.1.5 Remove the monitor and prepare it for operation.
2.1.1.6 Replace the lenses and lens frame assembly.
2.1.1.7 After the initial setup is done, remove and
reattach the monitor from inside the helmet. Remove
the monitor when taking off the respirator at the end
of the shift and to do any service or calibration,
including turning the monitor on and off. Do this to
make sure the monitor is fully functional before placing it
inside the helmet.
W
ARNING
Remove the monitor at the end of the shift, turn
it off and store it in a clean environment. At the
beginning of each shift, turn on the monitor and
make sure it is fully functional before installing
in the helmet. Failure to do so could result in CO
poisoning and death.
2.1.2 Installing in Apollo 60 and Apollo 600
Respirators
Refer to Section 2.1,1 for mounting the monitor in Apollo 20
respirators.
2.1.2.1 Place the transparent mounting strip on the
inside of the inner lens, and into the same window
gasket groove as the inner lens, as shown if Figure 4.
Position it so it is within peripheral vision toward the side
of the window opening.
Figure 4
2.1.2.2 Remove backing from the Velcro®hook tape
and adhere it anyplace on the mounting strip (the loop
tape adheres to the monitor) making sure the alarm-
lights are visible from inside the helmet.
2.1.2.3 Attach the monitor to the strip, with the buttons
facing toward the outer edge of the window opening and
alarm-lights toward the center of the window opening.
Don the helmet to make sure the monitor alarm-lights
are visible from inside the helmet.
2.1.2.4 Remove the monitor and prepare it for operation.
Mark the location anyplace
inside of the window
extension and attach
Velcro®hook tape. Make
sure the monitor’s alarm-
lights are visible when the
helmet is donned.
As seen from inside the hood,
the strip is inserted into the
groove in the window gasket.
Attach Velcro®hook tape
anyplace on the inside of the
strip. Make sure the monitor’s
alarm-lights are visible when
the helmet is donned.

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© 2015 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 24658, Rev. D
2.1.2.5 After the initial setup is done, remove and
reattach the monitor from inside the helmet. Remove
the monitor when taking off the respirator at the end
of the shift and to do any service or calibration,
including turning the monitor on and off. Do this to
make sure the monitor is fully functional before placing it
inside the helmet.
W
ARNING
Remove the monitor at the end of the shift, turn
it off and store it in a clean environment. At the
beginning of each shift, turn on the monitor and
make sure it is fully functional before installing
in the helmet. Failure to do so could result in CO
poisoning and death.
2.2 Turning On and Start-up Procedure
This section explains how to start up the CMS-3 and to
prepare it for operation.
2.2.1 Press and hold the POWER/MODE button until the
alarm beeps. The alarm sounds briefly, the vibrator
vibrates briefly, all elements of display are activated, and
the alarm-lights and LCD backlight turn on for a few
seconds.
2.2.2 The CMS-3 then displays CO (the target gas)
and time before displaying the battery voltage.
W
ARNING
If the unit is in low battery warning, change the
battery as soon as possible. Do not use the
respirator if the dead battery warning is alarmed.
2.2.3 The alarm beeps again after the battery voltage
is displayed. The CMS-3 is now in the Measuring Mode,
which is the normal operating mode. The CO
concentration (ppm) is displayed and the current time is
shown at the bottom of the LCD. NOTE: When using the
CMS-3 for the first time, check the current time and
verify that it is correct for your time zone. If it is not, set
the time as described in Section 3.7 Setting the Time.
2.2.4 Performing a Fresh Air Adjustment
Before using the CMS-3, set the fresh air reading to
ensure accurate gas readings in the monitoring
environment. Refer to Section 4.1
2.2.4.1 Find a fresh air environment. This is an
environment free of toxic or combustible gases and of
normal oxygen content (20.9%).
2.2.4.2 With the unit on and in Measuring Mode, press
and hold the AIR button for about three seconds to allow
the CMS-3 to set the fresh air reading. While pressing
the AIR button, the LCD displays “hold,” a prompt to
keep pressing the AIR button.
2.2.4.3 When the fresh air readings have been set, the
LCD displays “Adj” for 2 seconds which prompts you to
release the AIR button. The unit will set the reading to 0
ppm.
2.2.4.4 The unit then returns to normal operation and
the display indicates the current gas concentration.
2.3 Turning Off the CMS-3
2.3.1 Remove the monitor when taking off the
respirator at the end of the shift.
2.3.2 Press and hold the POWER/MODE button for
about five seconds to turn off the unit. The alarm will
beep while the POWER/MODE button is being pressed
before the unit turns off.
2.3.3 Release the button when the LCD is blank. The
unit is off.
2.3.4 Store the monitor in a clean dry area.
3.0 OPERATION
This section describes the normal operation of the CMS-
3, and includes alarm indications. Ref. Figure 5
3.1 Measuring Mode
After having powered up the CMS-3 and performed a
fresh air adjustment following the instructions of the
previous section, Turning ON and Start Up, the CMS-3
is in Measuring Mode. In Measuring Mode the monitor is
in the normal operating mode, the battery level, time,
and CO concentration are displayed on the LCD. The
battery icon has four bars visible when the battery is full.
As the battery charge decreases, the bars disappear.
CO is displayed in parts per million (ppm). The time is
shown in military format with the hour going from 0 to 24.

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© 2015 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 24658, Rev. D
3.2 Displaying the Peak CO Concentration
3.2.1 The Peak Display shows the highest
concentration of CO the monitor has detected from the
time it was last turned on.
3.2.2 Make sure the CMS-3 is in Measuring Mode.
The current gas concentration should be displayed on
the LCD.
3.2.3 When the CMS-3 is in Measuring Mode (normal
operating mode), Press and release the POWER/MODE
button to enter Peak Display Mode. This activates the LCD
backlight and displays the Peak reading. A small Peak
symbol is displayed in the upper left corner of the LCD.
The time the spike occurred is shown in the time location.
Figure 5
3.2.4 A Peak alarm display cannot be cleared until the
monitor is turned off.
3.3 Displaying STEL, and TWA
Although some may find TWA and STEL information
useful, it is not pertinent for supplied-air respirator use,
because the maximum exposure limit for Grade D
breathing air is 10 ppm.
3.3.1 STEL is an acronym for short-term exposure limit,
and it is the average reading of CO during the last 15
minutes. TWA is an acronym for time-weighted average,
and it is the average reading for CO during the last eight
hours. If eight (8) hours has not elapsed since the unit
was turned on, the TWA is still calculated over eight
hours, with the missing time assigned a zero (0) value for
the readings. Similarly, if the unit has not been on for 15
minutes, the missing time is assigned a 0 value and the
STEL is calculated over 15 minutes. The Peak, STEL,
and TWA readings are cleared when the unit is turned off.
3.3.2 When the CMS-3 is in Measuring Mode (normal
operating mode), Press and release the POWER/MODE
button to enter Peak Display Mode. Press and release the
POWER/MODE button again to enter STEL Display Mode.
This will display the STEL reading. The word “STEL” is
displayed in the middle of the LCD above the reading.
3.3.3 Press and release the POWER/MODE button
again to enter TWA Display Mode. This will display the
TWA reading. The word “TWA” is displayed in the
middle of the LCD above the reading.
3.3.4 Press and release the POWER/MODE button
once again to return to Measuring Mode.
NOTE: If you do not press a button for 20 seconds while
displaying the Peak, STEL, or TWA readings, the unit
will return to Measuring Mode automatically and the
backlight will turn off.
3.4 Alarms
This section covers alarm indications. It also explains
how to reset the CMS-3 after an alarm has occurred and
how to respond to an alarm condition.
3.4.1 Alarm Indications
The audible alarm beeps, the unit vibrates, and the
alarm-lights flash when CO concentrations rises above
the low alarm point. The CMS-3 also alarms when the
high alarm point, the STEL alarm point, or the TWA
alarm point is reached. It has a low battery warning, dead
battery alarm, an over range alarm, sensor failure alarm,
and a system failure alarm. The table in Figure 6
summarizes the types of alarms produced by the CMS-3.
3.4.2 Resetting CO Alarms
3.4.2.1 To reset a CO carbon monoxide gas alarm, after
the CO reading falls below the low alarm point (10 ppm)
press and release the POWER/MODE button once.
NOTE: Even though the gas concentration may have
fallen below the alarm point, the alarm indications will
continue until the alarm is reset using the
MODE/POWER button as noted. A Peak alarm display
cannot be cleared until the monitor is turned off. If a TWA
or STEL alarm has been activated, it cannot be reset
unless the monitor is turned off.
3.5 Responding to Alarms
This section describes response to gas, over range,
battery, sensor failure, and system failure alarms.
3.5.1 Responding to CO Alarms
3.5.1.1 Follow an established procedure for responding
to CO gas alarms. It should include but not be limited to
removing the respirator as soon as it is safe to do so.
3.5.1.2 Reset the alarm by pressing and releasing the
POWER/MODE button once, after the CO reading falls
below the low alarm point.
AIR
POWER
MODE
CMS-3
10
ppm
12:29
Gas Concentration
Peak Alarm
Symbol
Battery Level
Time

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© 2015 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 24658, Rev. D
3.5.2 Responding to an Over Range Alarm
An over range alarm could indicate CO gas are above
the detection limit of 500 ppm. The CO concentration
reading is replaced by blinking brackets (ΠΠΠΠ).
WARNING
An over range condition may indicate an
extreme CO concentration. Remove the
respirator as quickly as possible when it is safe
to do so.
3.5.2.1 Follow an established procedure for responding
to CO gas alarms. It should include but not be limited to
removing the respirator as soon as it is safe to do so.
3.5.2.2 Reset the alarm using the MODE/POWER
button once the alarm condition has cleared.
3.5.2.3Calibrate the CMS-3 as described in Section
4.3.
3.5.2.4 Confirm the gas concentration with a different
CMS-3 or with another gas detecting device.
3.5.2.5 If the over range condition continues, the sensor
may need to be replaced.
3.5.2.6 If the over range condition continues after
replacing the sensor, contact Clemco Customer Service
at 636 239-4300 for further instructions.
Alarm Types and Indications
Alarm Type LCD Indications Other Alarm Indications
Low Alarm
and
High Alarm
Concentration of CO
rises above the alarm
point.
Note: Low and High
Alarms are both set at
the maximum exposure
limit of 10 ppm.
Gas reading flashes.
Back light turns on.
Audible alarm beeps twice per
second.
Unit vibrates twice per second.
Alarm-lights flash twice per second.
TWA or STEL
Concentration of CO
rises above the TWA or
STEL alarm point.
Back light turns on.
TWA or STEL blinks to the left of the battery
icon.
If the unit is in both TWA alarm and STEL
alarm, both TWA and STEL will be displayed.
Audible alarm beeps once per
second (Single Pulse).
Unit vibrates once per second.
Alarm-lights flash once per second
(Single Pulse).
Over Range
An over range condition
may indicate an extreme
CO concentration.
Gas reading replaced by blinking brackets
(ΠΠΠΠ).
Back light turns on.
Audible alarm beeps once per
second (Single Pulse).
Unit vibrates once per second.
Alarm-lights flash once per second
(Single Pulse).
Low Battery Warning Last remaining bar on the right in battery icon
flashes.
None.
Dead Battery Alarm • Gas reading replaced by FAIL.
• Battery icon flashes.
Audible alarm beeps twice per
second (Double Pulse).
Sensor Failure • Gas reading replaced by FAIL. Audible alarm beeps twice per
second (Double Pulse).
System Failure • Gas reading replaced by FAIL.
• Time replaced by SYS below FAIL
Audible alarm beeps twice per
second (Double Pulse).
Figure 6

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© 2015 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 24658, Rev. D
3.5.3 Responding to Battery Alarms
WARNING
The CMS-3 is not operational during a dead
battery alarm. Do not use the respirator until the
battery is replaced.
3.5.3.1 The CMS-3 is fully functional in a low battery
warning condition. However, only a couple of days of
operation may remain depending on certain conditions
such as alarm occurrences. Change the battery as soon
as possible when a low battery warning occurs. Refer to
Section 5.1 Replacing the Lithium Battery.
NOTE: Alarms and the back light feature consume
battery power and reduce the amount of operating time
remaining.
3.5.4 Responding to a Sensor Failure Alarm
3.5.4.1 Perform a calibration as described in Section 4.3.
3.5.4.2 If the sensor failure alarm continues, replace the
sensor as described in Section 5.2.
3.5.4.3 If the sensor failure alarm continues after
replacing the sensor, contact Clemco Customer Service
at 636 239-4300 for further instructions.
3.5.5 Responding to a System Failure Alarm
3.5.5.1 If a system failure occurs, turn off the unit and
turn it on again.
3.5.5.2 If the unit is still in system failure, contact
Clemco Customer Service at 636 239-4300 for further
instructions.
3.6 Setting the Alarm Points
3.6.1 There is a low-alarm point, a high-alarm point,
and STEL and TWA alarm points. The alarm points and
their factory settings are summarized below:
Low Alarm (displayed (LO): is triggered when CO
concentrations reach 10 ppm, which is the maximum
exposure limit for Grade D compressed air. Remove
the respirator as soon as it is safe to do so.
High Alarm (displayed (HI): Because the maximum
exposure limit for grade D breathing air is 10 ppm of
CO, the high alarm is also set to alarm when CO
concentration reaches 10 ppm. This alarm is a rapid,
twice per second beep and stresses the urgency to
remove the respirator as soon as it is safe to do so.
*TWA Alarm: TWA is an acronym for time-weighted
average; it is the average reading of CO during the
last eight hours.
*STEL Alarm: STEL is an acronym for short-term
exposure limit; it is the average reading of CO
during the last 15 minutes.
* Although some may find TWA and STEL information
useful, it is not pertinent for supplied-air respirator use,
because the maximum exposure limit for Grade D
breathing air is 10 ppm.
3.6.2 To begin, make sure the CMS-3 is turned off.
The LCD should be blank.
3.6.3 Press and hold the AIR button, then press and
hold the POWER/MODE button.
3.6.4 As soon as segments appear on the display
(approximately one second), release the AIR button.
When the unit beeps, release the POWER/MODE button
to put the CMS-3 into Alarm Point Adjustment Mode.
3.6.5 The LCD should display the Low (LO) Alarm
setting (10 ppm), the battery level, and peak alarm
symbol as Shown in Figure 5. NOTE: If the LCD shows
“CAL” in the lower left corner, the CMS-3 is in
Calibration Mode. Press and hold the POWER/MODE
button to turn off the unit. Repeat the process beginning
with Paragraph 3.6.2.
NOTE: You can only cycle through the alarm points in
the sequence noted in paragraph 3.6.1 once before the
monitor goes into its startup sequence followed by
Measuring Mode (operating mode). To cycle through the
alarm points again, press and hold the POWER/MODE
button to turn off the unit. Then repeat the process
beginning with Paragraph 3.6.2 to put the unit back into
Alarm Point Adjustment Mode.
3.6.6 To change the alarm point, press and release
the POWER/MODE button to cycle through the alarms.
NOTE: If you press and hold the POWER/MODE button
the monitor may turn off.
3.6.7 When an alarm point is displayed, use the AIR
button to increase the alarm point. If you pass the
desired setting, continue increasing the alarm point until
it reaches the maximum setting (50 for low alarm, and
500 for high alarm) and it will wrap around to the
minimum setting (0 for low alarm and 10 for high alarm).
3.6.8 If the alarm setting has been changed, press the
POWER/MODE button to save the new setting. The next
alarm point will be displayed.

CMS-3 IN-HELMET CARBON MONOXIDE MONITOR Page 9
© 2015 CLEMCO INDUSTRIES CORP. www.clemcoindustries.com Manual No. 24658, Rev. D
3.6.9 When finished viewing or adjusting the alarm
point settings, press and release the POWER button
repeatedly until the ROM number for the unit appears on
the LCD. (The ROM is the component that contains the
software that runs the CMS-3.) The CMS-3 will then go
into its startup sequence followed by Measuring Mode.
3.7 Setting the Clock
3.7.1 Make sure the CMS-3 is on and in Measuring
Mode.
3.7.2 Press and hold the Air button, then press and
hold the POWER/MODE button to put the monitor into
Time Adjustment Mode. Release the buttons when the
word “SEt” appears on the LCD as noted in Figure 7.
Below “SEt”, the time will be displayed and the hour in
the time will be flashing.
3.7.3 Use the AIR button to increase the hour to the
desired setting. If you pass the desired setting, continue
to increase the hour until it reaches 23 and then wraps
around to 0, then set to the desired setting.
Figure 7
3.7.4 Press the POWER/MODE button to accept the
hour setting. The minute starts flashing.
3.7.5 Use the Air button to increase the minute setting
to the desired setting.
3.7.6 Press the POWER/MODE button to accept the
minute setting and return to Measuring Mode.
4.0 CALIBRATION
This section covers the calibration of the CMS-3. Setting
the fresh air reading is described first followed by setting
the calibration value.
WARNING
Use a 0.5 LPM (liters per minute) fixed flow
calibration connector (Clemco Stock No. 25572)
when calibrating. Use of a different flow rate
may adversely affect the accuracy of the
calibration.
4.1 Calibration schedule
Calibrate daily for the first week of operation.
Calibrate weekly for the first month of
operation.
Calibrate at least monthly thereafter.
Calibrate before use if the monitor was out of
service for more than one week.
4.2 Setting the Fresh Air Reading
Fresh-air settings must be done in a fresh air
environment, free of toxic or combustible gases and of
normal oxygen content (20.9%). The usual method is to
set it in fresh ambient air. If fresh, ambient air cannot be
assured, set the fresh air reading with impurity free test
gas, as described in Section 4.2.2.
4.2.1 Setting the fresh air reading with ambient air
4.2.1.1 Turn on the CMS-3 by pressing and holding the
POWER/MODE button for one second. Allow the unit to
finish its warm-up sequence.
4.2.1.2 Press and hold the AIR button. While pressing
the AIR button, the LCD displays “Hold,” a prompt to
keep pressing the AIR button.
4.2.1.3 When the fresh air reading has been set, the
LCD displays “Adj,” a prompt to release the AIR button.
It will set the reading to 0 ppm.
4.2.2 Setting the fresh air reading with impurity
free test gas
The following is required to set the fresh air setting with
impurity free test gas.
• Impurity free test gas, Stock No. 11132
• Calibration connector with tubing and calibration cup.
4.2.2.1 Make sure the monitor is off.
4.2.2.2 Make sure the calibration connector valve is
closed, and then attach the connector to the test gas
cylinder.
AIR
POWER
MODE
CMS-3
Time Set
Display
12:29
SEt