COHP CO Monitor
User Instructions
www.bullard.com
This unit is designed to monitor breathing air for carbon monoxide contamination from a
compressed air source. The air flows through the sampling hose and into the monitor where a small
amount (~0.5 lpm) is diverted through a preset internal regulator and flow restrictor. This delivers
a continuous flow of sample air to the sensor chamber. The monitor will analyze the air and display
the CO concentration on the face of the monitor in parts-per million (ppm).
The Green LED located on the outside of the COHP will illuminate during normal operation when
the CO level is below the CO alarm point (10 ppm US and 5 ppm International). If the CO level rises
above the alarm set point, the Red LED on the outside of the COHP will illuminate and an audible
alarm will sound.
The unit is available housed a protective polycarbonate case that can be carried or mounted on the
wall. All system lights and alarms are located on the outside of the polycarbonate case. Grade-D air
must be supplied to the system and must be free of oil and water to prevent contamination of the
sensor. The monitor can operate on 115 VAC or 12 volts DC.
Function Modes
The knob on the front of the COM10 or COM5 monitor sets the functions for the CO monitor and can
be switched to RUN, TEST and CAL.
RUN
mode is the operation/detection mode. The monitor must be in the RUN mode to monitor the
supplied breathing air. Supplied air must be turned on and flowing to the instrument while in this
mode. When the supplied air is off or interrupted while the monitor is in the RUN mode, the low flow
alarm will sound and LF will be displayed on the monitor until the supplied air is turned on.
TEST
mode allow for bump testing of the sensor or for silencing of the low flow alarm when
supplied air is shut off. To perform a bump test, place the monitor in the TEST model and flow
the calibration gas into the center of the knob. The reading on the monitor should be 10
+/–
1 if
applying CO gas. The reading on the monitor should be zero or 1 if applying the zero gas. In the test
mode, the supplied air will not be monitored and there is no need to turn the supplied air off when
entering this mode. Unit must be zeroed after a bump test is performed.
CAL
is the calibration and zero calibration mode. When the monitor is switched to CAL, the supplied
air will not be flowing to the sensor and there is no need to shut off the supplied air. When in the
CAL mode, (AC) AutoCal® will be displayed. Pressing the On/Off button once while in this mode
will change the display to (AO) AutoZero. For calibration and zeroing instruction, see the Calibration
section.
F1 (fault)
is indicated on the display when the knob is not positioned securely in one of these
three modes.
indicates that the system requires a re-calibration
indicates a low battery
COHP Specs
Case Size: ...........................................................................................................................17” W x 13”H x 7”D
Weight: ...........................................................................................................................................................11 lbs
Case: .........................................................................................................................................................Pelican®
Monitor Display: ...................................................................................................................................2 digit LCD
Sensor Type: ............................................................................................Electrochemical; Carbon Monoxide
Detectable Range: .................................................................................................................................0-99 ppm
Power: ..................................................................................... 110/220VAC 50/60Hz or 12 volts DC backup
Operating Temperature: ................................................................................. -4º to 120ºF (- 20º to 48.89ºC)
Operating Pressure: .......................................................................................................................5 psi - 120 psi
Calibration: ...................................... Manual CO and Zero - Auto-Cal - no manual adjustments required
Humidity Range: ........................................................................................................................................0-100%
Alarm Setting: .....................................................................................................10 ppm (5 ppm International)
Shielding: .................................................................................................Internal RFI/EMI coating on Monitor
Normal Operation: .....................................................................................................................Green LEDLight
Alarm Signals:
High CO ...................................................................................................................Red LED light
High CO .....................................................................................................Audible alarm (90dB)
Low Battery .............................................................................................Amber light (Blinking)
Low Battery ...............................................................................................Audible alarm (chirp)
Low Flow ....................................................................................................Audible alarm (90dB)
Warranty: ....................................................................................................Two years on sensor and monitor
CAB15 (15 cfm)
Description
Part Number
Carbon Monoxide Monitor
COM10 or COM5
Remote Alarm Jack
Inlet Fitting- Coulder Coupler
Pressure Relief Valve
41PRV
Sampling Connector Kit
COHPKIT
Incudes:
3/8” x 1/4” Adaptor
Colder Coupler
Tee fitting
Reinforced Sampling tube with Colder plugs – 5 ft. length
CO Monitor
Pressure Relief
Valve
Inlet port
Remote
Alarm
Jack
