8
INS/ANAINST/007-EN Rev. B
| Endura AZ40 | Sensor assembly | Orifice and seals kit
8 Replacing sensor assembly gaskets,
flow disk and replacing / cleaning the
aspirator
8.1 Removing the probe, exhaust filter, adaptor flange
(if fitted) from the sensor
Referring to Fig. 8.1:
1.
If a flange adaptor
A
is fitted, use a 10 in. adjustable
spanner (wrench) to loosen and remove flange mounting
nuts and washers
B
and remove flange.
2.
Unscrew probe / filter
C
and remove from manifold
D
.
3.
Remove exhaust filter
E
from aspirator
F
using an
open-ended
7
/
8
in. spanner (wrench).
4.
Perform the required replacement / cleaning procedures by
referring to the following sections:
— Replacing sensor assembly gaskets: see section 8.2 to
remove covers, then section 8.3, page 9
— Replacing / cleaning sensor assembly aspirator: see
section 8.4, page 12
— Replacing sensor assembly flow disk: see section 8.2 to
remove covers, then section 8.5, page 14
8.2 Removing / Replacing sensor covers
8.2.1 Removing the sensor covers
Referring to Fig. 8.2:
1.
Use a medium flat-bladed screwdriver to unscrew 4
(captive) cover retaining screws
A
and remove cover
B
.
Retain cover for re-use.
2.
Use a medium flat-bladed screwdriver to unscrew 2
(captive) cover retaining screws
C
and remove cover
D
.Retain cover for re-use.
8.2.2 Refitting the sensor covers
Referring to Fig. 8.2:
1.
Apply a light coating of anti-seize compound (suitable for
temperatures up to 200 °C [392 °F]) to the threads of
sensor cover mounting screws
A
and
C
.
2.
Refit covers in the reverse order of removal – refer to
Section 8.2.1 (above).
3.
Refit the probe / filter assembly in the reverse order of
removal – refer to Section 8.1 (above).
4.
Prepare the sensor assembly for operation by reversing the
sensor shutdown / removal procedure at the process –
refer to Section 4, page 4.
5.
Refer to Operating instruction OI/AZ40-EN to restore the
analyzer to full operational condition.
Fig. 8.1 Removing the probe, exhaust filter, adaptor flange from the sensor
IMPORTANT (NOTE)
Check the seals fitted to each cover. If they need
replacing or seals have bonded to the mating
surfaces of the sensor assembly, replace them.
Refer to Instruction
INS/ANAINST/010-EN for the
sensor cover seals replacement procedure.
Fig. 8.2 Removing the sensor covers
