OFFICINE OROBICHE S.p.A.
2/3
24010 Ponteranica (BG) ITALY - via Serena, 10 Tel. 0039/35/4530211 Fax 0039/35/570546
e-mail: [email protected]
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JULY ’05
Under reserve of modification
IST/019-I
5. STARTING UP
- Make sure that the operating conditions do not exceed the rated values (higher pressure and temperatures, lower
specific gravity) and that the electrical rating is the correct one.
- Test the instrument for correct switching by changing the liquid level a few times.
6. CALIBRATION
The instrument is factory-calibrated and does not require any adjustments on the spot.
7. MAINTENANCE
Routine inspections should be carried out (every six months or so) to check the performance of the instrument
from the time it is installed. The checks are simple and quick and are of two types: inspection of the body/float
and inspection of the contact.
WARNING
- NEVER remove the cover before making sure that the power supply is disconnected.
- NEVER leave the housing uncovered for longer than it takes to carry out the inspection.
- NEVER use the instrument for pressure or temperature exceeding the rated values shown on the data plate.
- NEVER use the instrument at higher electrical rating than shown on the data plate.
- NEVER carry out adjustments or replace parts before reading carefully the instructions. In case of doubt, check
with our aftersales service.
- NEVER lubricate any of the instrument’s components.
- NEVER use the instrument in liquids containing iron particles in suspension: the magnet might attract them and
cause the instrument to stop working.
- If the instrument operates at high temperature, take all precautions to avoid any contact with hot parts.
ROUTINE INSPECTION OF THE BODY / FLOAT
Carry out regular cleaning of the float (6) and of the magnet (5) on the fluid side. Make sure there are no scales or
filth between the magnet and the process flange (3) and between the magnet and the fulcrum supports (4) that
prevent the float from moving freely.
ROUTINE INSPECTION OF THE CONTACT
When the instrument is removed for routine cleaning, move the float (6) manually to check that the microswitch
switch regularly.
REPLACING THE SWITCH GROUP
The microswitch is an integral part of the switch group and never needs to be removed. If the microswitch shows
malfunctioning, the whole switch group - supplied as a standard spare - needs to be replaced. Remove the housing
(10) from the process flange by means of the screws (1) which fasten it. Remove the two screws (8) inside the
housing which fasten the switch group and extract it pushing from the terminal block side. Insert the new switch
group taking care that the terminal block is on the side of the electric input (7). The switch group is not reversible
and does not run properly if it is held upside down. Screw the unit together again and check for proper operation
like when executing routine inspections.
8. TROUBLE - SHOOTING
Series 10 level switches are designed for long fault-free life. If a level switch does not emit the alarm signal, the
tripping unit should be checked and then the body/float as described in the preventive servicing paragraph. If the fault
is not identified after all tests have been carried out, please refer to our after-sales service.
9. WASTE DISPOSAL
Disposal of the instruments must comply with rules in force with regard to noxious toxic materials as well as to
special materials (PVC , PTFE , PP , PVDF , neoprene, viton , asbestos free joints, steel and metal alloys, aluminium,
copper, brass, plexiglas and glass).
