INFICON VSC150A absolute switch, passiv - Manual (Page 15)

Then admit dry protective gas to the Vacuum Switch up
to a pressure of 20 mbar, check basic adjustment of the
Vacuum Switch as described in 2.3.1.1.
Close adjusting valve turning clockwise with the dyna-
mometric key.
Note
The amount of torque for the adjustment valve is
Md = 3.5 to 4 Nm.
Now produce desired pressure - between 0.5 and 20
mbar.
Remove protective cap (6/1) and turn adjusting screw
(6/2) carefully clockwise till the relay of the connected SV
switching amplifier is de-energized.
The contact via terminal 11 and 12 must now be open
(Fig. 5).
Then replace protective cap (6/1).
Later correction or change of the switch point between
0.5 and 20 mbar can be made anytime without readjust-
ment of the reference pressure of 20 mbar. Such a chan-
ge of the switch point is made exclusively by means of
the adjusting screw (6/2). The adjusting valve (6/4)
remains closed.
To reduce the switching pressure turn adjusting screw
(6/2) clockwise.
To increase the switching pressure turn adjusting screw
(6/2) counterclockwise.
2.4 Differential Pressure Adapter
The differential pressure adapter (6/5) consists of an
DN 16 KF flange with threaded tubulation and seal-off-
fitting. It is screwed onto the VSC150 Vacuum Switch
substituting the adjusting valve (6/4) and enables the
pressure switch to be used as a differential pressure
switch or a pressure balance indicator. Its operating
range is up to 2000 mbar. Differential pressures
(
∆
p = p
R
- p
M
) between + 5 and -20 mbar can be set up.
2.4.1 Connecting the Differential Pressure
Adapter to the Vacuum Switch
- Unscrew the adjusting valve (6/4) turning counterclock-
wise using Allan key (5 mm).
- Screw in differential pressure adapter (6/5).
Do not force!
- The connection ports of sensing chamber (1/2) and
reference chamber (1/5) are now separated.
(1/9) Connection of sensing chamber „M“;
(1/10) Connection of reference chamber „R“.
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15
tina42e1 (2005-03) VSC150.ga
tina42e1 (2005-03) VSC150.ga
Then admit dry protective gas to the Vacuum Switch up
to a pressure of 20 mbar, check basic adjustment of the
Vacuum Switch as described in 2.3.1.1.
Close adjusting valve turning clockwise with the dyna-
mometric key.
Note
The amount of torque for the adjustment valve is
Md = 3.5 to 4 Nm.
Now produce desired pressure - between 0.5 and 20
mbar.
Remove protective cap (6/1) and turn adjusting screw
(6/2) carefully clockwise till the relay of the connected
SV switching amplifier is de-energized.
The contact via terminal 11 and 12 must now be open
(Fig. 5).
Then replace protective cap (6/1).
Later correction or change of the switch point between
0.5 and 20 mbar can be made anytime without readjust-
ment of the reference pressure of 20 mbar. Such a chan-
ge of the switch point is made exclusively by means of
the adjusting screw (6/2). The adjusting valve (6/4)
remains closed.
To reduce the switching pressure turn adjusting screw
(6/2) clockwise.
To increase the switching pressure turn adjusting screw
(6/2) counterclockwise.
2.4 Differential Pressure Adapter
The differential pressure adapter (6/5) consists of an
DN 16 KF flange with threaded tubulation and seal-off-
fitting. It is screwed onto the VSC150 Vacuum Switch
substituting the adjusting valve (6/4) and enables the
pressure switch to be used as a differential pressure
switch or a pressure balance indicator. Its operating
range is up to 2000 mbar. Differential pressures
(
∆
p = p
R
- p
M
) between + 5 and -20 mbar can be set up.
2.4.1 Connecting the Differential Pressure
Adapter to the Vacuum Switch
- Unscrew the adjusting valve (6/4) turning counterclock-
wise using Allan key (5 mm).
- Screw in differential pressure adapter (6/5).
Do not force!
- The connection ports of sensing chamber (1/2) and
reference chamber (1/5) are now separated.
(1/9) Connection of sensing chamber „M“;
(1/10) Connection of reference chamber „R“.