Combustion Oxygen Monitor
Endura AZ20 Series Probe 5 Dismantling and Reassembly – Probe
18 IM/AZ20M–EN Rev. B
5.7.3 Fitting a New C-ring and Cell
Referring to Fig. 5.5:
1. Transfer the alteration details onto the new
Commissioning Label
A supplied with the new cell and
fix the new Commissioning Label to the probe body.
Referring to Fig. 5.6:
2. Check the cell mounting area for damage and ensure it is
clean and dry. Clean by hand only using a non-metallic
pan scourer – do not use any other abrasives.
3. Position a new 'C-ring
A into recess B.
4. Locate the cell
C and use a small screwdriver to align it
with the test gas injection pipe hole
D in the probe body
end plate.
5. Carefully slide the cell into the probe body end plate. Do
not rotate the cell once it has engaged with the helical
contact at the end of the thermocouple / electrode
assembly.
6. Refit the test gas injection pipe E ensuring the short end
is fitted into the test gas injection pipe hole
D.
7. Proceed to Section 5.7.4 to fit the diffuser flame arrestor.
5.7.4 Fitting the Diffuser Flame Arrestor
Referring to Fig. 5.6:
1. Locate the diffuser flame arrestor
F by aligning the
internal notch G with the test gas pipe.
2. Locate the 6 M4 x 50 bolts H and fit nuts I.
3. Tighten the 6 M4 x 50 nuts and bolts using an M4 spanner
and 3 mm A/F hexagon wrench (supplied), Tighten
opposing bolts evenly to a torque of 4 cNm (5.66 ozf/in).
4. At the probe head, press the thermocouple / electrode
assembly spring locator
J in and refit and tighten the M4
retaining screw
K.
5. Re-connect the red (Cell+), green (TC+) and white (TC–)
wires L to the inner terminal block connections.
6. Refit the probe end cap – refer to Section 5.6.2, page 15.
7. Re-install the probe as detailed in the probe User Guide
(IM/AZ20P–EN).
8. Make gas supplies to the probe and electrical supplies to
the transmitter – refer to the transmitter User Guide
IM/AZ20P–EN and probe User Guide (IM/AZ20E–EN).
9. Use the new cell’s Zero and Cal. Factor data on the
Commissioning Label to commission and calibrate the
probe – refer to the transmitter User Guide (IM/AZ20E–EN)
for calibration details.
Fig. 5.5 Commissioning Label Details and
Location on Probe
Note. A small amount of anti-seize grease or oil can
be used on these nuts only to assist assembly. Do not
use anti-seize grease or oil on any other probe fixings.
Note. AutoCal versions only – if the test gas to sensor
tube M was disconnected at step 1, Section 5.7.1,
page 16, reconnect it.
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