Maintenance And Cleaning; Dismounting, Return And Disposal - WIKA PS-900 Operating Instructions Manual

Faults Causes
Contact chatter Vibrations
(repeated, short-dura-
tion opening and
Process pressure
closing).
fluctuation
Switching status Error with switch point
remains unchanged setting.
despite reaching the
switch point/reset
Contacts defective
point.
(e.g. fused contact
zone).
Pressure port blocked.
Leakage
Insufficient pressure
For the exchange of the instrument chapters 8 "Dismounting, return and disposal"
and 5.6 "Commissioning, operation" must be observed.

7. Maintenance and cleaning

7.1 Maintenance
The instruments are maintenance-free.
The switch point setting must be checked after 6 months. Carry out switch point setting
with matching test assembly, see chapter 5.2.
Repairs must only be carried out by the manufacturer.
7.2 Cleaning
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 pressure supply and
switch the load circuit off.
2. Use the requisite protective equipment.
3. Clean the instrument with a moist cloth.
Electrical connections must not come into contact with moisture!
WIKA operating instructions, pressure switch, high adjustability of switch differential, model PS-900
Measures
Decouple the instrument
mechanically.
Fit the pulsation dampener and
adjust the damping screw as
required
Carry out switch point setting
with matching test assembly,
see chapter 5.4.
Replace instrument Before recom-
missioning 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.
Check the process line pressure
with pressure gauge.
CAUTION!
Damage to the instrument
Improper cleaning may lead to damage to the instrument!
▶
Do not use any aggressive cleaning agents.
▶
Do not use any hard or pointed objects for cleaning.
4. Wash or clean the dismounted instrument, in order to protect persons and the environ-
ment from exposure to residual media.

8. Dismounting, return and disposal

WARNING!
Physical injuries and damage to property and the environment through
residual media
Residual media in the dismounted instrument can result in a risk to persons, the
environment and equipment.
▶
Observe the information in the material safety data sheet for the corresponding
medium.
▶
Wash or clean the dismounted instrument, in order to protect persons and the
environment from exposure to residual media.
8.1 Dismounting
WARNING!
Risk of burns
During dismounting there is a risk of dangerously hot media escaping.
▶
Let the instrument cool down sufficiently before dismounting it!
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 there is no pressure.
8.2 Return
Strictly observe the following when shipping the instrument:
All instruments delivered to WIKA must be free from any kind of hazardous substances
(acids, bases, solutions, etc.) and must therefore be cleaned before being returned.
7