ABB Endura AZ20 series

Endura AZ20 series probe
Combustion oxygen monitor Appendix B – Endura AZ20/ZFG2 Replacement Probe
34 IM/AZ20P–EN Rev. G
B.3 ZMT Transmitter Connections
B.3.1 Disconnecting the Existing ZFG2 Probe
Referring to Fig. B.3:
1. Unlock and open the door
A, remove the 2 retaining
screws B and remove the mains protection plate C.
2. Disconnect wires from heater terminal D, cell terminal
E and thermocouple terminal F and loosen conduit
entry gland
G.
3. For probes using the conduit’s Reference Air line,
disconnect existing reference air supply pipe H, remove
the conduit and proceed to step 5.
4. For probes using an external Reference Air connection,
leave the existing reference air supply I in place.
B.3.2 Connecting the Endura AZ20/ZFG2 Replacement
Probe
Referring to Fig. B.3:
1. Pass the new conduit through entry gland G and tighten
the gland.
2. Make connections to heater terminal D, cell terminal E
and thermocouple terminal F, as listed in Table B.2.
3. For probes using the conduit’s Reference Air supply,
connect conduit reference air line
H.
4. Refit the mains protection plate C and secure it with the
2 retaining screws B.
5. Close and lock the door A.
Warning. Before disconnecting or connecting conduit,
ensure the power supply, any powered control circuits and
high common-mode voltages are switched off.
Note. For transmitters without internal pumps, the
Reference Air connection is made directly to the probe’s
external 'Ref. Air' connection – see Fig. B.1, page 30.
ZMT Terminal Connection Wire
H Heater Brown
H Heater Blue
E Heater Earth
Green /
Yellow
Cell + Oxygen Input (+ve) Red
Cell – Oxygen Input (–ve) Blue
Cell SCN Oxygen Input Screen Braid
TC+ Thermocouple (+ve) White
TC– Thermocouple (–ve) Blue
Table B.3 Conduit Connections at ZMT Transmitter
Fig. B.5 Endura AZ20/ZFG2 Replacement Probe
Conduit Connections at ZMT Transmitter
A
B
C
H
D
E F
I
G