ABB Endura AZ20 series

Combustion Oxygen Monitor
Endura AZ20 Series Probe 5 Dismantling and Reassembly – Probe
IM/AZ20M–EN Rev. B 13
5 Dismantling and Reassembly – Probe
5.1 Before Removing / Replacing the Probe
5.2 Before Dismantling a Probe
5.3 Preparation
The following equipment and working conditions are
recommended to ensure the probe is maintained in a suitable
environment:
 a clean, dry, moisture- and dust-free atmosphere
 a workbench of at least twice the probe length – for
example, to maintain a 4.0 m (13.12 ft) probe, a
workbench of at least 9.0 m (29.5 ft) is recommended
 support along the complete length of the internal
assembly – a length of plastic guttering can be used to
protect the ceramics and other components during
removal / refitting, or extra personnel can be used
5.3.1 Tools Required
 M4 open-ended spanner (supplied with probe)
 3 mm A/F Hex wrench
(supplied with probe and restrictor kit)
 2.5 mm A/F Hex wrench
(supplied with restrictor kit)
 small hacksaw
 scalpel or similar small sharp blade
 small flat-bladed (terminal) screwdriver
 small pozi-drive (crosshead) screwdriver
 medium flat-bladed screwdriver
 small magnet
 A torque driver set to 4 cNm, fitted with a 3 mm hexagon
wrench (or a 3 mm A/F hexagon wrench)
5.3.2 Replacement Kits and Spares
Refer to Section 7, page 42 and Section 8, page 45 for
replacement kits.
Warning.
 When in operation, the cell end of the probe reaches
temperatures up to 100 °C (212 °F). Allow the cell to
reach ambient temperature before starting
maintenance procedures.
 Do not attempt to remove a probe unless the system
it is used in has been shut down and isolated.
 Do not attempt to remove a probe without approval
from authorized personnel.
 Before removing a probe from the flue, prepare the
flue for probe removal in accordance with relevant
safety and site regulations.
 Fit a blanking flange to the process if necessary.
 Use lifting equipment with a lifting capacity in excess
of the total probe weight – refer to the probe User
Guide (IM/AZ20P–EN) for probe weights.
Caution. Probe internal components are fragile – for ease
of handling, ensure a minimum of 2 personnel are used
when handling 2 to 4 m (6.6 to 13.1 ft.) probes and ensure
support is provided along the complete length of the inner
assembly.
Warning.
 Clean the outer surfaces of the probe thoroughly to
prevent contamination of inner assemblies.
 If the probe has been in service, the parts exposed to
the process gases may be contaminated with
corrosive or hazardous substances. Check with the
process operators for possible contaminants or
request a CoSH sheet.
 Oil, grease, hand cream and even oily skin can
contaminate the probe’s internal structure causing
poor stability and drifting readings. when handling any
probe parts, beware of introducing contaminants.
 Do not bend the internal structure – the heater and
thermocouple / electrode insulators are fragile and will
be damaged or break if bent.
 Handle internal components carefully, keep them
clean and ensure mating surfaces are not damaged
during maintenance procedures.
 Do not subject the probe to blows from hammers or
sharp objects.
 Do not reuse damaged parts, use new replacement
parts only.