ABB Endura AZ20 series User Manual

Endura AZ20 series probe
Combustion oxygen monitor 2 System Overview
IM/AZ20P–EN Rev. G 5
2 System Overview
This User Guide provides the following information:
 schematics for systems fitted with or without restrictors
(including test gas and reference air requirements) – see
section 3.3, page 6 for product identification
 installation details for integral and remote Endura AZ20
probes – see section 3, page 6
 electrical connection details:
– for standard probe connection details (without
automatic calibration [AutoCal]) between a remote
Endura AZ20 probe and a remote Endura AZ20
transmitter – see section 4.3.1, page 20
– for automatic calibration connection details between
a remote Endura AZ20 probe and a remote Endura
AZ20 transmitter – see section 4.3.2, page 21
 electrical connection details between an existing ZDT
analyzer or ZMT transmitter and a remote Endura
AZ20/ZFG2 replacement probe (where the Endura
AZ20/ZFG2 replacement probe replaces an existing ZFG2
probe)
– refer to appendix B.2, page 33 for ZDT-FG
connections
– refer to appendix B.3, page 34 for ZMT connections
The Endura AZ20 oxygen probe measures oxygen
concentration in flue gas 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
by a sampling system using the 'dry analysis' method.
For customers with an existing installed ZFG2 probe with a ZMT
or ZDT transmitter, a 55 V heater version of the Endura AZ20
probe (the Endura AZ20 / ZFG2 replacement probe) is available.
System equipment comprises a (flue-mounted) Endura AZ20
probe controlled by an integral or remote transmitter. During
operation, a zirconia cell within the probe is held at a constant
temperature of 700°C (1292 °F) by a probe heater and control
thermocouple assembly. If the heater control circuitry or
software fails (unsafe), the probe heater power supply is
switched off, ensuring the system fails 'safe' and protects the
heater from an over-temp failure.
An output generated at the zirconia cell is processed in the
transmitter giving a locally displayed O
2 reading and a 4 to 20
mA retransmission signal over any range between 0 % and 100
% O
2.
Optional automatic calibration (AutoCal*) enables automatic,
semi-automatic or manual calibration to be performed using a
probe-mounted gas control manifold mounted within the probe
head. Calibration sequencing is software-controlled from the
transmitter.
Optional restrictors (where fitted*) in the probe head control the
test gas and reference air flow without the need for flowmeters.
The probe requires only preset test gas and reference air
pressures of 1 bar (15 psi) to maintain a constant flow of 2.2 l /
min (4.662 scfh). This flow is not affected by changes in the
measured gas pressure of ± 0.35 bar (5 psi).
*Not available for Endura AZ20/ZFG2 replacement probes.
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 the system or modifying system
parameters.
 Install and use this equipment as detailed in this guide.
Install and use associated equipment in accordance
with the relevant national and local standards.
Warning. Endura AZ20 probes must be connected only to
an integral or remote Endura AZ20 transmitter (AZ20XX1
or 2).
Endura AZ20/ZFG2 replacement probes (AZ200002) must
be connected only to a ZDT-FG or ZMT transmitter.

ABB Endura AZ20 series Specifications

General

Brand	ABB
Model	Endura AZ20 series
Category	Measuring Instruments
Language	English