ABB Endura AZ40 Manual page 12

Referring to Fig. 8.4:
4. Use a small flat-bladed screwdriver to depress the spring
connectors at terminal numbers 17 and 19 and disconnect
CO heater block thermocouple T/C 1 wires from top
terminal block connectors A.
5. Pull thermocouple (T/C 1) wires up through (right) opening
B in flange block C.
6. Carefully slide CO heater block insulation D away from
flange block C.
CAUTION – Minor injuries
Appropriate PPE (gloves / goggles) must be worn
when performing this step. The heater block
insulation material is fragile and becomes brittle
after continuous operation. When sliding insulation
away from the manifold, handle with care.
7. Use a small flat-headed screwdriver to remove screw E
with attached thermocouple retaining washer F from CO
heater block G. Retain screw / washer assembly for
re-use.
8. Withdraw thermocouple (T/C1) H from CO heater block
G and discard thermocouple.
9. Slide the new thermocouple (T/C1) into its chamber in CO
heater block G.
10. Apply a small amount of anti-seize compound (suitable for
temperatures up to 200 °C [392 °F]) to the thread of screw
E and use a small flat-headed screwdriver to secure
screw E with attached thermocouple retaining washer
F to CO heater block G.
12 INS/ANAINST/008-EN Rev. B | Endura AZ40 | Sensor assembly | Heater and thermocouple kit
11. Feed thermocouple (T/C1) wires down through right
opening B in flange block C and make terminal block
connections at the top connectors A as follows:
— connect one wire from thermocouple H (T/C1)
to terminal 18.
— connect one wire from thermocouple H (T/C1)
to terminal 19.
sensor in the reverse order of removal – refer
12. Refit the O
2
to steps 1 to 3 page 11.
13. To replace flange block thermocouple (T/C 2), refer to
Section 8.4, page 14.
14. Refit sensor covers – refer to Section 7.2, page 8.