Description of Functions
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The condition monitoring and diagnostics modes cannot be activated simultaneously for both
switching points. That means that when a switching point is already parameterized to C.no,
C.nc, D.no or D.nc, the other can only adopt the modes H.no, H.nc, F.no or F.nc.
The version P10 is purely a pressure switch and therefore does not offer condition monitoring
mode to monitor the vacuum leakage.
With the version VP8 with combined vacuum/pressure measurement range, the switching points react ac-
cording to the position of their “upper” switching point SPx/FHx as a pressure switch or vacuum switch.
Values are considered “bigger” when they are further from zero and as “smaller” when they are closer to
zero.
The following diagram shows the switching point behavior using the two-point mode as an example:
Pressure [bar]
Switching point (SP)
Reset point (rP)
Reset point (rP)
Switching point (SP)
Vacuum [mbar]
Vacuum range
SP < rP
Pressure range
SP > rP
Switching point active
Time (t)
9.4.2 Two-Point Mode
The two-point mode is a threshold switch with hysteresis.
When the measurement value increases, the switching point will be active when the switch-on threshold
SPx is reached and remains on until it falls below the reset threshold rPx. The following must always apply
for switching thresholds and reset thresholds: |SPx| > |rPx|. The hysteresis is therefore defined by the differ-
ence |SPx – rPx|.
