ABB Endura AZ20 series, User Manual

Page: 10 / 40

Endura AZ20 series probe
Combustion oxygen monitor 3 Mechanical Installation
8 IM/AZ20P–EN Rev. G
3.5 Pneumatic Connections
3.5.1 Pneumatic Connection Configurations
Refer to the pneumatic configuration flowchart (Fig. 3.3) below to identify which system configuration is the closest match for your
components and then refer to the relevant figure in Section 3.5.2, page 9 or 3.5.3, page 10 for pneumatic settings.
Caution.

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 restrictors – the reference air and test gas flow is regulated by the restrictors installed in the probe which
require a set pressure of 1 bar (15 psi) to deliver the correct flows. 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.
Fig. 3.3 Pneumatic Connection Configurations (Schematic)
*Commissioning Label – identifies if
AutoCal and Restrictors are fitted – see
Section 3.3, page 6
*Is probe
fitted with
restrictors?
Yes
No
*Is probe
fitted with
AutoCal?
Yes
No
Reference
air
supply
using ABB
air pump
To identify
your system
configuration
*Is probe
fitted with
AutoCal?
using ABB
filter / regulator
See
Fig. 3.4
page 9
See
Fig. 3.5
page 9
Reference
air supply
Yes
*Is probe
fitted with
AutoCal?
*Is probe
fitted with
AutoCal?
See
Fig. 3.6
page 9
See
Fig. 3.7
page 9
See
Fig. 3.8
page 10
See
Fig. 3.9
page 10
See
Fig. 3.10
page 10
See
Fig. 3.11
page 10
No
Flowmeters Not Required
(test gases
must
be
applied as pressure)
Flowmeters Required
(test gas flow
must
be
regulated by flowmeters)
Yes
No
Yes
No
using ABB
air pump
using ABB
filter / regulator