APPLICATION
The BOLL Differential Pressure Indicator is a robust and compact device
indicating the contamination level of
the filter elements.
The differential pressure between filter inlet and filter outlet is the measurable indicator for the contamination
degree of the filter element. When the
preset maximum value of differential
pressure is reached, the filter needs to
be cleaned.
The color of the disc segments visible
in the two displays indicates the contamination degree: The red segment
rises proportionally to the level of
contamination. When the segment is
completely red, the differential pressure limit is reached.
DESIGN AND OPERATION
Inside the device is a plunger which is
held in zero position by a spring. As
differential pressure rises with increasing contamination, the plunger is
displaced against the resistance of
the spring. By magnetic transmission
the display disc turns according to the
movement of the plunger and shows
more and more red segments. The
setting of the requested differential
pressure is effected by factory installation of a corresponding spring.
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