
Installation and Operation Manual - COMTEC
®
6000
Service and Maintenance
Doc.-ID: COM6000_11022020_EN
39
5.8
Exchange of Probe Inner Part
Switch off the electronic unit, take the probe out of the protection tube and wait until it has cooled down.
Warning hot surface
The probe may only be removed with heat-insulated gloves. Before removing the probe, always switch off
the supply voltage to the electronic system. After removal, store the probe in a safe, protected place and
wait until it has cooled down below 35 °C/95 °F.
Disconnect the wires of the probe inner part
, the two tubes
-
and the thin reference air tube. Loosen the
two screws
and dismount the plate
. Now the complete probe inner part (4 hole ceramic rod with measuring
signal wire, thermocouple and heater) can be unplugged carefully
.
Move the new probe inner part carefully into the probe and screw the plate
. The probe inner part is now pushed
against the cell by the spring. Connect all electrical and pneumatic connections. Connect the wires as follows
:
Figure 34
- Probe connection box
Terminal
Color
Description
Polarity
Unit
1
white/brown
signal wire, measuring cell
-
mV
2
orange
signal wire, measuring cell
+
mV
3
green
thermocouple element 1
+
mV
4
white
thermocouple element 1
-
mV
6
black
heating element
7
blue
heating element
8 green/yellow ground/earth
heater
9 grey
solenoid
valve
10
grey / blue
solenoid valve
11
white / red
CO
e
sensor measuring value
12
white / red
CO
e
sensor measuring value
13 red
(no.3)
CO
e
sensor heating element
14 red
(no.4)
CO
e
sensor heating element
1
4
2
3
5
6