CMS-4 IN-HELMET CARBON MONOXIDE MONITOR
Page 3
© 2019 CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 29872
1.6
Ancillary Equipment Requirements
1.6.1
In addition to the monitor, the following
equipment is required to operate and maintain the CMS-
4 Monitor:
Calibration connector with 0.5 LPM fixed-flow
slide valve, tubing, and calibration cup: Stock
No. 29767.
25 ppm Test Gas: Stock No. 25573.
1.7
Components and Functions
Items included with the monitor package are shown in
Figure 1. Callouts shown in Figure 2 are items needed to
perform routine functions.
1.7.1 Case:
The CMS-4’s sturdy, high-impact plastic
case is dust proof, water resistant, and .radio frequency
(RF) resistant.
The digital LCD is visible through the clear window on
the front of the case. During normal operation
(Measuring Mode), it displays
CO (Type of gas detection)
Remaining battery life
Current time
The heart symbol pulses, indicating the monitor is
in normal operating status.
In other modes, the LCD displays functions necessary to
operate and maintain the monitor. Refer to menu modes
in Section 4.0.
Below the LCD are two black control buttons: AIR and
POWER/MODE. The operator uses the buttons to make
selections and adjustments though various menus. Refer
to Section 1.7.8 for button functions
To the left of the LCD is the audible alarm opening,
which is located inside the case.
1.7.2 Sensor Retainer:
The sensor retainer is located
on the right side of the case and allows access to the
filters, sensor gasket, and sensor.
1.7.3 Sensor:
The sensor is held in its socket by the
sensor retainer. The CO sensor is an electrochemical
cell that consists of two precious-metal electrodes in a
dilute acid electrolyte. A gas-permeable membrane
covers the sensor face and allows gas to diffuse into the
electrolyte. The gas reacts in the sensor and produces a
current proportional to the concentration of the target
gas. The current is amplified by the CMS-4’s circuitry,
converted to a measurement of gas concentration, and
displayed on the LCD.
1.7.4 Sensor Gasket:
The sensor gasket fits over
and seals around the sensor.
1.7.5
Charcoal Filter (black):
A black charcoal filter is
placed into a recess in the filter gasket over the CO
sensor. The charcoal filter disk scrubs H2S and certain
hydrocarbons out of the sample to avoid false CO
readings. If false or elevated CO readings are noticed,
especially in the presence of H2S, change the charcoal
filter.
Refer to Section 6.3: Replacing the Charcoal Filter.
1.7.6
Hydrophobic Filter (white):
The white, circular
hydrophobic filter sits into the larger recess on the filter
gasket, on top of the charcoal filter.
OP E N
O
L
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S
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CLEMCO
Figure 1
1.7.7 LCD:
A
digital LCD (liquid crystal display) is
visible through the clear plastic window in the top of the
case. During normal operation in Measuring Mode, the
LCD displays CO concentrations, the time, remaining
battery life, and the heart symbol pulses, indicating the
monitor is in normal operating status. The LCD also
shows information for each of the CMS-4’s operating
modes. Once the monitor is ON, pressing the
Power/Mode or Air control button turns on the LCD
backlight for 30 seconds. NOTE: Except in dark places,
the display is easily seen without the backlight.
Calibration Cup
Calibration
Connector
0.5 LPM Slide Valve
Velcro®
Hook Tape
CMS-4 Monitor
Velcro®
Loop Tape
Transparent
Mounting Strip
25 ppm CO
Test Gas
Tubing 3/16" x 2 Ft
