Maintenance And Cleaning - WIKA FSFD Operating Instructions Manual

For further information, see chapter 1 "General information".
Faults Causes
Contact is not Electrical connection is
switching in interrupted
accordance with the
Wiring error, e.g. short-circuit
specification at the
set switch point/reset
Electrical load unsuitable
point
Contact contaminated
Short-circuit Moisture in the instrument
Leakage at the flow Wrong tightening torque of the
switch U-bolt nuts
Dirt or foreign bodies under the
saddle sealing
Surface of the mounting pipe
is not even
Instrument is not Pipe is blocked by deposits or
functioning correctly foreign bodies
Flow port blocked
Switching status Error with switch point setting
remains unchanged
despite reaching the
switch point/reset
Contacts defective (e.g. fused
point
contact zone)
Flow port blocked
Leakage
For the replacement of the instrument, observe chapters 8 "Dismounting, return and
disposal" and 5 "Commissioning, operation".

7. Maintenance and cleaning

7.1 Maintenance
Inspect the instrument every month.
There is no specific maintenance required, only a regular check and inspection.
WIKA operating instructions, flow switch, model FSFD
Measures
Carry out a continuity test on the electri-
cal connection leads
Check the pin assignment and correct it
if necessary
Maintain the permissible electrical loads
Replace instrument
Only use in ambient conditions for which
the ingress protection is suitable
Take care to use the correct tightening
torque (→ see table "Compatible pipes")
Clean the pipe surface and sealings
before mounting
Ensure that the pipe mounting surface
does not have any dents or defects
Remove deposits or foreign bodies
Replace instrument
Carry out switch point setting with
matching test assembly (→ see chapter
5.4 "Electrical mounting")
Replace instrument
Before recommissioning the new
instrument, provide a protective circuit
for the contact
Replace instrument
Carry out a leak test
Seal the process connection or replace
the instrument
7.2 Cleaning
WARNING!
Risk of burns
With cleaning there is a risk through hot surfaces.
▶
Before cleaning the instrument, allow it to cool sufficiently and use protecti-
ve equipment if necessary!
CAUTION!
Physical injuries and damage to property and the environment
Improper cleaning may lead to physical injuries and damage to property and
the environment. Residual media in the dismounted instrument can result in a
risk to persons, the environment and equipment.
▶
Carry out the cleaning process as described below.
1. Before cleaning, correctly disconnect the instrument from the flow system and
switch off the load circuit.
2. Use the requisite protective equipment.
3. Clean the instrument with a moist cloth.
Electrical connections must not come into contact with moisture!
8. Dismounting, return and disposal
8.1 Dismounting
1. To avoid accidental water damage, all control valves should be closed and the
system completely drained before removing or replacing the flow switch.
2. Turn off the power supply and disconnect the wiring.
3. Loosen the nuts and remove the U-bolt.
4. Carefully lift the saddle until you can reach the vane with your fingers.
5. Roll-up the vane and lift it out of the hole.
DANGER!
Danger to life caused by electric current
Upon contact with live parts, there is a direct danger to life.
▶
The dismounting of the instrument may only be carried out by skilled
personnel.
▶
Remove the instrument once the system has been isolated from power
sources.
WARNING!
Physical injury
When dismounting, there is a danger from aggressive media and high pressures.
▶
Observe the information in the material safety data sheet for the corresponding
medium.
▶
Dismount the instrument when the flow is interrupted.
7