www.bullard.com
Set Up
Secure a Grade-D air source with pressure under 150 psig. Using the fittings included in the
COHPKIT, connect the COHP monitor to the air source.
Connecting to the 41 Series Airline Filter
The 41P2 comes with two outlet ports on the regulator, one 3/8” and one 1/4” female pipe thread.
To connect the COHP sampling hose to the 41P2, screw the Colder coupler into the 1/4” port on the
filter. This is the point at which the sampling hose will connect. Also included in the kit is an adaptor
which will allow for the use of the 3/8” port if necessary.
The 41P6 comes with 6 outlet ports on top of the filter. Each of these ports is 3/8” female pipe
thread. To connect the COHP sampling hose to the 41P6, thread the 3/8” x 1/4” adaptor into one
port on the filter. Then thread the Colder coupler into the adaptor. This is the point at which the
sampling hose will connect.
Attach the other end of the sampling hose to case via the Colder coupler connection on the side of
the COHP (Figure 1).
Monitor Operation
Connect the AC cord to the power inlet on the side of the COHP and then plug the cord into the AC
power source.
NOTE:
This unit may be operated using DC power – 8 ea. AA batteries if no AC power is available.
See Optional DC Power Supply information
Flip the switch on the Control Box to ON position (Figure 2).
Ensure the knob on the CO Monitor
is rotated to the TEST position. This
will prevent the Low Flow alarm
from sounding during start up if no
air is flowing.
Push the ON button located
behind the front cover of the CO
Monitor(Figure 3 ).
Wait for the 60 second countdown
shown on the CO Monitor display
screen.
Calibrate the CO Monitor if necessary. See
Calibration Instructions.
Connect the RA remote alarm assembly
(optional) to the remote alarm jack.
With air flowing, turn knob to RUN.
NOTE:
The knob must be in RUN position
for active monitoring of the CO in
the air supply.
Shutdown
The monitor can be left “ON” continuously when being operated on 115VAC. If operating on the
optional AA battery backup power, it is recommended that the control box and the monitor be
turned off when not in use to reserve battery power.
1) Turn off the main air supply to the monitor.
2) Turn monitor OFF at the ON/OFF switch located behind the front cover of the CO Monitor. You will
hear three short beeps to let you know the monitor is OFF.
3) Turn the control box switch to the OFF position.
Zero-Point and Calibration Process
NOTE:
It is recommended that the Clean Air box be under pressure with no air going through the
outlet fitting when perfroming zero point adjustment or calibration.
NOTE:
If monitor has been relocated to a different working area and ambient temperatures change,
allow the unit to stabilize for 15-20 minutes prior to Zero Point adjustment and calibration.
Zero-Point Adjustment
Zero calibration should be performed before calibrating the monitor with CO gas. Bullard
recommends using impurity free test gas to re-zero and whenever the zero-point has drifted.
Zero Adjustment Procedure
Remove the front cover of the CO Monitor
Push the ON button. The unit will beep and begin a 60 second countdown.
Rotate the knob located on the front of the CO Monitor the CAL position.
“AC” will appear on the display.
Press and hold the ON/OFF button until the unit beeps.
“AO” will appear on the display.
Attach the calibration valve to the Zero gas cylinder
Insert the calibration connector fitting into the center of the knob on the front of the monitor.
Open the cylinder valve fully. The flow rate is preset so there is no need to adjust it.
The red LED will continue to blink for 90 seconds during which the Zero Adjustment process will take
place.
Watch for the green LED to begin blinking. This indicates a successful zero.
With the Zero air still flowing, turn the knob to TEST. The reading should be Co 0 or Co 1. If any
other reading is displayed, repeat the Zero Point Adjustment.
Close the cylinder valve completely and remove the calibration connector fitting from the center of
the knob.
With the incoming air flowing, turn the knob to RUN.
NOTE:
Knob must be in the RUN position for active monitoring of CO in the air supply
Calibration Instructions
The COM5 and COM10 are Auto-Cal instruments. All calibration adjustments are made by the
microprocessor.
Monitor calibration should be performed monthly or whenever the reading may be questionable. A
calibration schedule should be maintained for future reference. To obtain an accurate calibration, we
recommend the use of Bullard calibration kits.
Calibration Procedure
Remove the front cover of the CO Monitor, and if necessary, push the ON button.
Rotate the knob located on the front of the monitor to the CAL position.
“AC” will appear on the display.
Attach the regulator to the calibration gas cylinder (10 ppm CO required).
Insert the calibration connector fitting into the center of the knob.
Open the cylinder valve fully. The flow rate is preset and there is no need to adjust it.
The Red LED on the front of the monitor will continue to blink for 90 seconds during which the
calibration process will take place.
Watch for the green LED to blink. This indicates a successful calibration.
With the 10ppm gas still flowing, turn the knob to TEST. The reading should be Co 10+/-1. If
any other reading is displayed in the test mode, repeat both the Zero Point adjustment and CO
calibration.
Close the regulator on the CO gas cylinder completely and remove the calibration connector fitting
from the center of the knob.
Rotate the knob to the RUN position.
Fig. 1
Fig. 2
Fig. 3
On/Off
Button