ABB Endura AZ20 series

Combustion Oxygen Monitor
Endura AZ20 Series Probe 6 Dismantling and Reassembly – Transmitter
IM/AZ20M–EN Rev. B 39
6.3 Replacing the Remote Transmitter Backplane
6.3.1 Removing the Backplane
1. Remove the transmitter cover and cartridge as detailed in
Section 6.1.1, page 36, steps 1 to 4.
Referring to Fig. 6.5:
2. Disconnect the existing power and signal connections to
terminal blocks
A and insulate individual mains cable
terminations as a safety precaution.
3. Unscrew and remove the 3 backplane retaining pillars /
screws B using a 7 mm A/F socket.
4. Lift the backboard C out of the probe transmitter
housing D and discard the backboard – refer to the
transmitter User Guide (IM/AZ20P–EN) for disposal
recommendations.
5. Proceed to Section 6.3.2 to fit a new backplane.
6.3.2 Fitting a New Backplane
Referring to Fig. 6.6:
1. Position the new backboard A in the transmitter housing
B.
2. Tighten the 3 backplane retaining screws C to secure
the backplane A to the transmitter housing B.
3. Proceed to Section 6.3.3, page 40 to make probe cable
connections.
Warning. Isolate the transmitter from power supplies before
removing the cover and label the isolator to prevent
accidental switch on..
Fig. 6.5 Removing the Backplane from a Remote Transmitter
B
A
B
C
D
Fig. 6.6 Fitting a New Backplane to a Remote Transmitter
C
C
D
A
B