ABB Endura AZ40 Operating Instruction page 14

8.5 Replacing sensor assembly flow disk
WARNING – Bodily injury
– Probe assemblies (standard and high temperature
versions) contain fibrous material that can be a
health hazard if airborne.
– Appropriate PPE, including mask, goggles and
gloves must be worn when performing this
procedure.
Referring to Fig. 8.7:
1. Place the sensor assembly on a clean flat surface with the
flange studs pointing down.
2. Remove 2 long screws B using a small flat-headed
screwdriver.
3. Remove the flow disk assembly from flange manifold C.
4. Remove 2 (short) screws A using a small crosshead
screwdriver.
5. Separate flow disk cover plate D, flow disk top cover
gasket E, flow disk F, flow disk plate G and flow disk
lower cover gasket H. Discard gaskets E and H.
6. Fit a new flow disk into flow disk plate G, aligning the
center of the curved flow disk face I against the small
hole in the middle of the plate and in the orientation shown
(concave face uppermost).
CAUTION – Damage to equipment
Do not manually snap the flow disk.
This will cause it to malfunction.
7. Place a new flow disk top gasket over flow disk plate G.
8. Apply a light coating of anti-seize compound (suitable for
temperatures up to 200 °C [392 °F]) to the threads of 2
(short) screws A and secure items
using 2 (short) screws A. Tighten the screws firmly.
9. Place a new flow disk lower cover gasket in position on the
flange manifold C, ensuring screw holes are aligned
correctly.
10. Position the flow disk assembly over the new flow disk
lower gasket aligning the notched corner of the flow disk
assembly J with the upper right-hand corner. Ensure
screw holes are aligned correctly.
11. Apply a light coating of anti-seize compound (suitable for
temperatures up to 200 °C [392 °F]) to the threads of 2
(long) screws B and secure the flow disk assembly to
the flange manifold. Tighten the screw to a torque of
10 ±1 in.-lbs (1.1 Nm).
14 INS/ANAINST/007-EN Rev. B | Endura AZ40 | Sensor assembly | Orifice and seals kit
12. Apply 207 kPa (30 psig) air to air supply port K and check
13. Refer to Section 8.2.2, page 8 to refit the sensor cover.
14. Prepare the sensor for operation by reversing the
, F and G
D E
,
for leaks around the gasket and for no flow through
aspirator L. If leaks are detected, tighten the screws until
all leaks are corrected. If flow is detected through the
aspirator at room temperature, rebuild the flow disk
assembly.
WARNING – Bodily injury
– Do not use compressed air for any other
purpose than that for which it is provided.
– Never direct a stream of compressed air
towards your body or the body of any other
person.
– When handling / connecting compressed air
lines the correct safety procedures must be
observed.
shutdown / removal / isolation procedures –
refer to Sections 5 and 4 (pages 4, 4).