D860MGB rev04
22/32
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Act on screw n. 9 to adjust at the right pressure and activate the hand pump lever. The adjusting
pressure of the hand pump is the max one reached and shown on the manometer.
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Discharge the pressure with the emergency hand button.
CALIBRATION OF THE PRESSURE SWITCHES (PRESSURE MIN. - MAX. - OVERLOAD)
In case a pre-determined pressure is reached inside a pressure switch, an electrical contact, which can be
switching, opening or closing, is activated. Pressure switches with different insulating classes, different
precision levels or different hysteresis are also possible.
The following drawings show three types of pressure switches and two types of contacts. The regulation of
the intervention pressure is obtained through single- slot screw which lays in the center of the pressure
switch (see Figure 14).
Turn clockwise, the intervention pressure increases, turn anti-clockwise, it decreases.
The pressure switch is assembled on the valve block and lays directly on the pressure line which gets to the
cylinder, before the piloted rupture valve VBP, consequently it is always under pressure.
Adjust the pressure switch as follows:
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Close the main shut-off valve.
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Discharge the pressure with the hand button
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Take the pressure to the wanted value using the hand pump
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Connect a tester to the pressure switch contacts
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Act on the regulation screw of the pressure switch, until a contact exchange is obtained.
Figure 15
– Limit switch