Differential Pressure Indicator0 pages
APPLICATION
The BOLL Differential Pressure Indi
cator is a robust and compact device
indicating the contamination level of
the ilter elements.
f
The differential pressure between fil
BOLL Differential
Pressure Indicator
TYPE
TYPE
TYPE
TYPE
4.36.1
4.36.2
4.46.1
4.46.2
ter inlet and filter outlet is the meas
urable indicator for the contamina
tion degree of the filter element.
When the preset maximum value of
differential pressure is reached, the
filter needs to be cleaned.
The colour of the disc segments vis
ible 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 dif
ferential 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 in
creasing 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 instal
lation of a corresponding spring.
Differential Pressure Indicators with
the contacts of the two reed-switches
In case of type 4.46 the internal parts
integral electronic contacts are pro
are activated magnetically.
are made of stainless steel and for
vided with two switches which can
u
se at an operating pressure of up
be independently used either as
The housing of the Differential Pres
to 160 bar. To avoid the danger of
switching contact or alarm contact.
sure Indicator is made of coated
electrostatic charge, the cover
At 75% and at 100% of the preset dif
die-cast aluminium and for use at an
glass may only be cleaned with a
ferential pressure threshold value,
operating pressure of up to 100 bar.
damp cloth.
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