INFICON VSC150A absolute switch, passiv - Manual (Page 19)

contact, terminals 12 and 13, of the two SV switching
amplifiers.
As soon as during pump down or venting the differential
pressure between annealing pot and vacuum furnace in
either direction exceeds 10 mbar, the respective pump
valve or venting valve is closed. The valves open again
as soon as the differential pressure has dropped below
the set switching pressure. Switching pressures can be
varied between 0.5 and 20 mbar by means of the adju-
sting screw (6/2).
3 Maintenance
For the pressure switches maintenance work is normal-
ly not nesessary. Slight contamination of the sensing
chamber does not affect the switching performance and
accuracy. If for one reason or other cleaning should
become necessary, observe Sections 3.1 or 3.2.
3.1 Cleaning the Sensing Chamber
- Remove protection cap (6/1).
- Unscrew adjusting screw (6/2) by turning counterclock-
wise and extract the complete setting mechanism (ball
and compression spring).
- Unscrew the three housing screws (6/3) and open the
sensing chamber.
Caution Do not exert pressure on the diaphragm.
Do not use any mechanical cleaning
means like emery paper, steel wool or
steel brushes. Cleanse with solvents
- petroleum ether, benzin or alcohol -
and dry. Replace gasket, if necessary.
19
19
tina42e1 (2005-03) VSC150.ga
tina42e1 (2005-03) VSC150.ga
contact, terminals 12 and 13, of the two SV switching
amplifiers.
As soon as during pump down or venting the differential
pressure between annealing pot and vacuum furnace in
either direction exceeds 10 mbar, the respective pump
valve or venting valve is closed. The valves open again
as soon as the differential pressure has dropped below
the set switching pressure. Switching pressures can be
varied between 0.5 and 20 mbar by means of the adju-
sting screw (6/2).
3 Maintenance
For the pressure switches maintenance work is normal-
ly not nesessary. Slight contamination of the sensing
chamber does not affect the switching performance and
accuracy. If for one reason or other cleaning should
become necessary, observe Sections 3.1 or 3.2.
3.1 Cleaning the Sensing Chamber
- Remove protection cap (6/1).
- Unscrew adjusting screw (6/2) by turning counterclock-
wise and extract the complete setting mechanism (ball
and compression spring).
- Unscrew the three housing screws (6/3) and open the
sensing chamber.
Caution Do not exert pressure on the diaphragm.
Do not use any mechanical cleaning
means like emery paper, steel wool or
steel brushes. Cleanse with solvents
- petroleum ether, benzin or alcohol -
and dry. Replace gasket, if necessary.