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Endura AZ25 series probe
Combustion oxygen monitor
2 Overview
This User Guide provides the following information:
installation details for Endura AZ25 probes – see Section
3, page 7
pneumatic schematics for systems fitted with or without
restrictors
(including
requirements) – see Section 3.5, page 9
Endura AZ25 system electrical connection details:
–
for standard connection details (system without
automatic calibration [AutoCal]) between an Endura
AZ25 probe and an Endura AZ25 remote transmitter –
see Section 4.2, page 21
–
for connection details (system with AutoCal) between
an Endura AZ25 AutoCal unit and an Endura AZ25
remote transmitter – see Section A, page 32
electrical connection details between Endura AZ25 probe
/ transmitter and ABB heritage products (see Appendix A,
page 32):
–
ABB heritage ZMT transmitter and Endura AZ25 probe
–
ABB heritage ZDT transmitter and Endura AZ25 probe
–
ABB heritage ZGP2 probe and Endura AZ25
transmitter
6
test
gas
and
reference
The
Endura
AZ25
concentration in high temperature furnace atmospheres using
an in situ 'wet analysis' method.
The 'wet analysis' method avoids measurement error (typically
20 % of reading higher than the actual value) that is introduced
air
by a sampling system using the 'dry analysis' method.
For customers with an existing (heritage) installed ZGP2 probe
with a ZMT or ZDT transmitter – both the AZ25 probe and the
AZ25 transmitter are fully backward-compatible.
System equipment comprises a (process-mounted) AZ25 probe
controlled by a remote AZ25 transmitter and where required, an
optional automatic calibration unit.
The AZ25 has a zirconia cell and a thermocouple assembly
within the probe. The zirconia cell produces a signal proportional
to the oxygen partial pressure of the sample. The thermocouple
measures the temperature of the cell for automatic temperature
compensation of the cell output.
An output generated at the zirconia cell is processed in the
transmitter giving a locally displayed O
20mA retransmission signal over any range between 0 % and
25 % O
.
2
Optional automatic calibration (AutoCal) enables automatic,
semi-automatic or manual calibration to be performed using a
remote gas control manifold mounted within the standalone
housing. Calibration sequencing is software-controlled from the
AZ25 transmitter. Optional restrictors control the test gas and
reference air flow without the need for flowmeters and flow
control valves.
Restrictors are fitted in the autocal unit to control the test gas
flow rates and in the proble to control the reference air flow rate.
The system requires only preset test gas and reference air
pressures of 1 bar (15 psi) to maintain a constant flow of 1.0 l/
min (2.118 scfh) and 0.5 l/min (1.06 scfh).
Warning.
System configuration must be carried out only by
users or personnel with approved access rights (user
privileges).
Read all relevant sections of this guide before
configuring
parameters.
Install and use this equipment as detailed in this
guide. Install and use associated equipment in
accordance with the relevant national and local
oxygen
probe
measures
reading and a 4 to
2
the
system
or
modifying
OI/AZ25P–EN Rev. E
2 Overview
oxygen
system
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