www.bullard.com
COHP CO Monitor
User Instructions
NOTE:
Typical calibration takes approximately 90 seconds. If unit will not calibrate within 3 minutes,
repeat the calibration steps with compressed air turned off. If the problem persists, contact
Bullard’s Customer Service Department at 1-877-BULLARD (285-5273).
NOTE:
Cam valve switch must be in RUN position for active monitoring of CO in the air supply.
Battery Replacement
A 9-volt battery is installed under the front panel cover to provide power to the CO monitor. This
monitor may also run solely on AC power if the COHP attached to an AC power supply.
To replace the 9-volt battery, remove the panel cover from the front of the CO monitor. Lift if off from
either the left or right side. If a 9-volt battery is being used to power the monitor and the battery
power becomes too low, the monitor will indicate low battery (LB) on the display to indicate it is time
to change the battery (Figure 4).
Optional DC Power Supply
The COHP may be operated using 8 AA
batteries to provide power to the external
lights and alarm and the CO Monitor.
During DC operation, the unit will operate
continuously for 80 hours. Alarm status
and duration can affect length of operation
when using the DC backup power supply.
Lights located on the box will indicate
whether the box is being operated on AC
or DC power. If the COHP being operated
with backup DC power (8 AA batteries),
the amber light on the top of the box will
burn steady. If the battery power for the
box falls below the required voltage, the
amber light on the top of the box will flash
indicating it is time to change the batteries.
There will also be an audible alert in the
form of short, intermittent beeps that will
serve as notification that the batteries are
low. The battery compartment is located
on the interior surface of the COHP case
(Figure 5).
Sensor Replacement
ATTENTION
Before installing a replacement sensor, verify that you have the correct sensor.
The CABRS is the replacement sensor for all COM10 or COM5 monitors with serial
numbers with a suffix “A,” and serial numbers with NO suffix. The CABRS2 is the
replacement sensor for all COM10 or COM5 monitors with serial numbers with a
suffix “B.” Also, the monitors that require the CABRS2 will have an extra board to
which the sensor mounts. See photos below to view the two sensors.
The sensor is easily accessible by removing the front of the housing from the COM5 or COM10
monitor.
To gain access to the sensor, remove the four screws on the front of the CO monitor only. After
removing the four screws, gently pry the front of the housing off from the bottom of the housing.
wARNINg
Removing the front of the housing by prying at the top will result in damage to the
housing. This damage is not covered under warranty.
Gently pull out the old sensor.
Remove the shorting clip cover from the new sensor.
Align pins and gently push the new sensor into the sockets.
Replace the front cover of the monitor when the sensor replacement is complete. Ensure LED lights
are aligned with housing before securing the front cover with screws.
After replacing the sensor, allow the instrument to warm up for at least 30 minutes. The new
sensor must be zeroed and calibrated before first use. See Zero-Point Adjustment and Calibration
Instructions.
One Year Limited warranty
Bullard warrants to the original purchaser that the CO Montior will be free of defects in material and
workmanship under normal use and service for a period of one (1) year from the date of purchase.
Bullard’s obligation under this warranty is limited to repairing or replacing, at its option, articles
that are returned within the warranty period and that are, after examination, shown to Bullard’s
satisfaction to be defective, subject to the following limitations.
a) CO Montior must be returned to the Bullard factory with shipping charges prepaid.
b) CO Montior must not be altered from its original factory configuration.
c) CO Montior must not have been misused, subjected to negligent use, or damaged in transport.
d) The date of purchase is within the one year warranty period. (A copy of the purchaser’s original
invoice showing the date of purchase is required to validate warranty coverage.)
In no event shall Bullard be responsible for damages for loss of use or other indirect, incidental,
consequential or special costs, expenses or damages incurred by the purchaser, notwithstanding
that Bullard has been advised of the possibility of such damages.
ANY IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE (1) YEAR FROM THE DATE OF
PURCHASE OF THIS PRODUCT.
Some states do not allow the exclusion or limitation of incidental or consequential damages, or allow
limitations on how long an implied warranty lasts, so the above limitations or exclusion may not
apply to you. This warranty gives you specific legal rights, and you may have other rights which vary
from state to state.
Fig. 4
Fig. 5
Fig. 6
Battery
Cover
Screws
CABRS
CABRS2
(red top)