Combustion Oxygen Monitor
Endura AZ20 Series Probe 5 Dismantling and Reassembly – Probe
IM/AZ20M–EN Rev. B 23
Referring to Fig. 5.9:
8. Slide the 2 electrode contact springs
J and the new
spring locator
K over the sleeved wires and slide them
along until the springs butt up to the insulator.
9. Cut the sleeved wires from the end of the short insulator
L to leave a length of 340 mm (13.4 in.).
DO NOT cut the sleeves.
10. Position the sleeves to leave 10 mm (0.4 in.) of bare wire,
M then bend the wire over by approximately 5 mm
(0.2 in.) to retain the PTFE sleeves.
11. Refit the cell assembly as described in Section 5.7, page
16.
12. Carefully slide the assembled thermocouple / electrode
assembly N into position in the probe body, supporting
the insulators to prevent damage.
13. Locate the M4 spring locator retaining screw O to secure
the assembly.
14. Reconnect the red (Cell +), green (TC+) and white (TC–)
sleeved wires P to the inner terminal block connections.
The 3 PTFE sleeved wires (TC+, TC– and Cell+) must be
free to slide within the spring locator by up to 30 mm
(1.2 in.) to allow for thermal expansion of the probe body
during probe operation.
15. AutoCal versions only – if the Test Gas to Sensor tube
Q was disconnected at step 1, in Section 5.8.1, page
20, reconnect it.
16. Refit the probe end cap – refer to Section 5.6.2, page 15.
17. Re-install the probe – refer to the probe User Guide
(IM/AZ20P–EN).
18. Make gas supplies to the probe and electrical supplies to
the transmitter.
19. If a new cell has been fitted, re-calibrate the probe – refer
to the transmitter User Guide (IM/AZ20E-EN).
Fig. 5.9 Fitting a New Thermocouple / Electrode Assembly
Red
(Cell +)
Green
(TC +)
White
(TC –)
10 mm 0.40 in.)
5 mm 0.2 in.)
3
4
0
m
m
(
1
3
.
4
i
n
.
)
T
a
i
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