Yokogawa Pneumatic Retractables RF20H - Manual (Page 13)

IM 12B06K05-E-E
13
6. Servicing
6.1 Servicing instructions
• Establish a service plan adapted to your process!
• Leave servicing works to qualified staff.
• Always wear applicable protective clothes when
performing servicing works.
• Do only perform the service works described in
the operation manual!
• Constructional modifications must be agreed with
the manufacturer!
• Tubing and tanks must be pressure-free, empty
and clean before disconnecting the holder from
the process
• Ensure that there is no potentially explosive
atmosphere
6.2 Checking wetted sealings
The retractable holder is fitted with an inspection
window situated between the lower housing
cramps.
Check inspection window for leaking
process liquid on a regular basis.
Fig. 10: Inspection window on lower housing
cramp
Process liquid leaking on the inspection
window!
Risk depending on process liquid property!
• Replace wetted sealings.
• Observe instructions in chapter 6.6!
6.3 Removing the sensor
How to remove the sensor:
1) Move holder to “service” position.
2) Remove sensor cable.
3) Remove PG cable gland.
4) Remove sensor.
Broken glass sensor!
Broken glass may damage the wetted
sealings.
• Check wetted sealings and replace if
necessary.
• Observe instructions in chapter 6.6!
6.4 Removing the pneumatic tubes
How to remove all four pneumatic tubes:
1) Move holder to "service" position.
2) Stop compressed air supply.
3) Press plastic ring “A” on pneumatic
connection.
4) At the same time pull pipe “B”.
Fig. 11: Removing the pneumatic tubes
CAUTION!
DANGER!
WARNING!
23
6 Servicing
6.1 Servicing instructions
" Establish a service plan adapted to your process!
" Leave servicing works to qualified staff.
" Always wear applicable protective clothes when performing
servicing works.
" Do only perform the service works described in the operation
manual!
" Constructional modifications must be agreed with the
manufacturer!
" Tubing and tanks must be pressure-free, empty and clean
before disconnecting the holder from the process
" Ensure that there is no potentially explosive atmosphere
6.2 Checking wetted sealings
The retractable holder is fitted with an inspection window situated
between the lower housing cramps.
Check inspection window for leaking process liquid on a
regular basis.
Fig. 10: Inspection window on lower housing cramp

CAUTION!
DANGER!
WARNING!
CAUTION!
DANGER!
WARNING! CAUTION!
DANGER!
WARNING!
CAUTION!
DANGER!
WARNING!
6 Servicing
25
Abb. 11: Removing the pneumatic tubes
6.5 Removing the cleaning chamber with
process connection
System is under pressure.
Process liquid will leak when holder is disconnected from process
in an inappropriate way.
! Tubing or tanks must be pressure-free, empty, clean and
without potentially explosive atmosphere.
" Interrupt the process.
" Ensure that the system is pressure-free, empty, clean and
without potentially explosive atmosphere.
How to remove the cleaning chamber:
1. Move holder to “service” position.
2. Switch off compressed air supply.
Emitted compressed air
can cause material damage or personal injury.
!
Switch off compressed air supply before removing the
pneumatic tubes.
3. Remove pneumatic tubes (chap. 6.4).
DANGER!

WARNING!