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Endura AZ25 series probe
Combustion oxygen monitor
3.5 Pneumatic connections
Note.
The configuration option of having flow restrictors fitted to the probe determines the way the reference air and test gas flow
is controlled. Ensure the instructions for the pneumatic connections are followed accurately – an incorrect configuration at
the probe can cause errors and / or permanent damage.
All configurations – do not use gas mixers online to supply test gases to the probe(s) unless it can be confirmed that
errors are not introduced by the high delivery pressures required to the probe(s).
Probes with restrictor – the reference air flow is regulated by a restrictor installed in the probe which requires a set
pressure of 1 bar (15 psi) to deliver the correct flow. Because the gases are delivered as a pressure at the probe it is
permissible to use parallel pipework for multiple-probe installations.
Probes without restrictors – the reference air and test gas flow is regulated by flowmeters (with integral needle valves)
fitted in the delivery lines to the sensor – one flowmeter is required in each delivery line.
3.5.1 Pneumatic entry types
Endura AZ25 AutoCal unit / test gas 1, 2 and vent
Metric
1
/
in. BSP female threaded
4
entry supplied with 6 mm OD
compression fitting
Table 3.1 Pneumatic entry types at Endura AZ25 AutoCal unit
3.5.2 Schematic – Endura AZ25 system without AutoCal
Reference air
inlet connection:
Reference air supplied to
probe using:
ABB reference air
pump*
OR
ABB 5 micron / oil
coalescing
filter regulator*/**
see Section 3.5.4,
page 11 for pneumatic
requirements
*Refer to Appendix B, page 33 for ABB part numbers
**Clean dry instrument air free from hydrocarbons
Fig. 3.4 Schematic – Endura AZ25 system without AutoCal
OI/AZ25P–EN Rev. E
Imperial
1
/
in. NPT female threaded
4
1
entry supplied with
/
in. OD
4
compression fitting
Endura AZ25 probe
Test gas connection (6 mm stub)
– see Section 3.5.4, page 11 for
pneumatic requirements
Metal M16 gland or
1
/
in. NPT adaptor
2
Endura AZ25 6-core screened sensor cable (length coded option) –
maximum length 100 m (328 ft.)
Endura AZ25 probe
Metric
1
Ref. Air:
/
in. BSP
4
Test gas: 6 mm dia. stud
Table 3.2 Pneumatic entry types at Endura AZ25 probe
Endura AZ25
remote transmitter
Mains supply
Relays
3 Mechanical installation
Imperial
1
Ref. Air:
/
in. NPT
4
Output signals
9
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