Endura AZ20 series probe
Combustion oxygen monitor 5 Start-up and Operation
26 IM/AZ20P–EN Rev. G
5 Start-up and Operation
5.1 Preparation
1. If the probe is not connected permanently to test gas
pipework for automatic calibration purposes, ensure
blanking plugs are securely fitted to the test gas inlet
connections on the probe.
2. If the probe is connected permanently to test gas
pipework for automatic calibration purposes, ensure that
the valve installed in the pipework adjacent to the test gas
connection is closed.
3. Check the connections on both the probe and the
transmitter.
Test gas connections must be checked for leaktight joints.
Leaks, especially on permanently pressurized
AutoCal-fitted probes, can cause errors and drain away
expensive bottles of test gas.
4. Adjust the reference air flow to a stable flow rate between
0.3 and 0.5 l / min (0.64 and 1.06 scfh) for probes with no
restrictors fitted or 1 bar (15 psi) for probes with restrictors
fitted.
– refer to Section 3.5.2, page 9 for probes fitted with
AutoCal.
– refer to Section 3.5.3, page 10 for probes without
AutoCal.
5. Set the test gas flows – Section 5.2, following.
6. Calibrate the system as detailed in IM/AZ20E-EN
5.2 Setting Up Test Gases
This section prepares the system for manual and automatic
calibration routines by setting up the test gas flows and
pressures to suit different AutoCal / restrictor configurations:
refer to Sections 3.5.2 and 3.5.3, pages 9 and 10 for test
gas and reference air supply configurations.
connections are the same for remote and integral
transmitters.
5.2.1 AutoCal System with Restrictors
To set up an AutoCal system with restrictors:
1. Make test gas and reference air connections as detailed in
Section 3.5.2, page 9 (remote or integral transmitter).
2. Turn on Test Gas 1 and set the pressure to a nominal
1 bar (15 psi).
3. At the transmitter, check the Calibrate / AutoCal Hardware
/ Hardware Type parameter is set to Internal.
4. At the transmitter, open the Test Gas 1 valve by selecting:
Calibrate / AutoCal Hardware / Valve Manual Control /
Test Gas 1 and pressing to open the valve.
A small icon is displayed to indicate the valve is in the
Open position:
5. Fine tune Test Gas 1 pressure to 1 bar (15 psi).
6. Turn gas off at the transmitter by pressing
, then turn
Test Gas 1 off at the supply.
7. Repeat steps 2 to 6 for Test Gas 2 (if present).
8. Refer to IM/AZ20E-EN to perform a calibration when
required.
Caution. If the test gas connection is not sealed
when not in use, air leaking into the probe via the
connection causes measurement errors. In a
pressurized flue, gases venting to atmosphere
through the connection cause corrosion of, and / or
block, the test gas tube. In a negative pressure flue,
air leakage causes high O
2 reading errors.
Note. Only perform a final system calibration after the
probe has been thermally stable for 2 hours.
Note. The following sections assume the transmitter and
probe are energized, the reference air supply is on and test
gases are available.
Valve icon
Open position
Valve icon
Closed position
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