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1.5
Unauthorized Modification
Modifications of or other technical alterations to the
instrument by the customer are not permitted. This
also applies to replacement parts. Any modifica-
tions / alterations required must be carried out by
Fischer Mess- und Regeltechnik GmbH only.
1.6
Inadmissible Modes of Operation
The operational safety of this instrument can only
be guaranteed if it is used as intended. The instru-
ment model must be suitable for the medium used
in the system. The limit values given in the technical
data may not be exceeded.
1.7
Safe working practices for mainte-
nance and installation work
The safety instructions given in this operating man-
ual, any nationally applicable regulations on acci-
dent prevention and any of the operating company's
internal work, operating and safety guidelines must
be observed.
The operating company is responsible for ensuring
that all required maintenance, inspection and instal-
lation work is carried out by qualified specialized
personnel.
1.8
Symbol explanation
WARNING!
… indicates a potentially dangerous situation,
non-observance of which could endanger per-
sons, animals, the environment or objects.
INFORMATION!
… highlights important information efficient and
smooth operation.
Tip!
… indicates recommendations that are not spe-
cifically necessary in certain situations but which
could be useful.
2
Application purpose
Display and switching device for differential pres-
sure of gaseous media. The instrument is to be ex-
clusively used for the applications agreed between
the manufacturer and user.
3
Description of the Product
3.1
Function diagram
3.2
Design and mode of operation
This switching device is based on a capacitive sen-
sor element that is suitable for measuring overpres-
sure, underpressure and differential pressure.
The measured pressure acts on the sensor element
with a micromechanically produced differential con-
denser in silicon-glass technology.
Changes in pressure generate changes in capacity,
which is evaluated by the device's electronics and
transformed into signals on the display, switch con-
tacts and an output signal.
4
Installation and assembly
At the factory, the device is calibrated for vertical
installation, but the installation position is arbitrary.
For any installation positions that are not vertical,
the zero-point signal can be corrected via the in-
stalled offset corrector.
The enclosure protection type IP 65 is only guaran-
teed, if a suitable power supply cable is used.
If the device is intended for outdoor use, we rec-
ommend permanently protecting the membrane
keypad against UV radiation and using a suitable
enclosure or at least the erection of a sufficiently
dimensioned canopy as a protection measure
against constant rain or snow.
Analogue-
output
Display
Switch contacts
Keyboard
Switch
output
Δp
Sensor element
Electronics
