6
SenSOr rePLACeMent
Replacement CO sensors are shipped with a metal clip installed between the electrodes. Do not remove the clip until the
sensor is to be installed in the monitor. O2 sensors do not require a clip installed between the electrodes.
SteP 1)
Disconnect all external connec-
tions and remove CO/O2 monitor
from the unit.
SteP 2)
Remove the four screws from the mon-
itor’s left endplate.
SteP 3)
Remove endplate to gain access to the
sensor cups.
SteP 4)
Remove sensor from sensor cup and remove leads. Take the new
sensor and remove the metal clip (CO sensor only). Reattach leads
to the proper colored terminals on the new sensor. Install new sensor
into sensor cup. O2 sensor connections are as follows: grey lead -
positive, white lead - negative.
SteP 5)
Reassemble monitor and reinstall in unit.
Connect all cables and air sample hose. Al-
low monitor to stabilize 30 minutes to 1 hour
and recalibrate.
UNUSED
CONTROL
(BLACK)
SENSING
(RED)
REFERENCE
(BLUE)
CO SENSOR
O2 SENSOR
CO SENSOR
Sensor replacement
