ABB Endura AZ20 series

Endura AZ20 series probe
Combustion oxygen monitor 4 Connections
24 IM/AZ20P–EN Rev. G
4.4.5 Vent
The vent allows the reference air to escape to atmosphere. If the
vent is likely to be exposed to moisture, connect a tube to the
vent and route to a dry area.
Ensure that the vent, or the vent tube, does not become
blocked during probe use.
4.4.6 Reference Air Inlet
A clean, dry, oil-free air supply is required, (for example, from a
pump or filter-regulator – see Appendix D, page 36.
Connect the reference air tubing to the external reference air
inlet – see Fig. 4.8.
4.4.7 Inline Shut-off Valves
On non-AutoCal systems, if the test gas line is connected
permanently and is >10 m (33 ft.) from the supply, fit non-return
valves at the probe head to prevent breathing of flue gas in and
out of test gas lines.
Fig. 4.7 Vent
Note.
 The reference air supply must be to instrument air
standards – clean, dry and free of oil vapor and
particle contamination; see schematics in Sections
3.5.2 and 3.5.3 on pages 9 and 10.
 ABB recommend using the ABB 5µm / Oil Coalescing
Filter Regulator to supply reference air – see Appendix
D, page 36.
 If oil vapor is suspected, use an ABB Reference Air
Pump to supply reference air to the probe – see
Appendix D, page 30.
Vent
Fig. 4.8 Reference Air Inlet
External
Reference
Air Inlet