2 | Product and functional description
FISCHER Mess- und Regeltechnik GmbH
6
BA_EN_DS13
2.3 Intended use
The DS13 is a switching device for differential pressure, over and under-pres-
sure for gaseous and fluid media. This series is ideally suited for various meas-
uring tasks in rough environments.
Typical application cases are the monitoring of tanks, filters and compressors.
Please contact the manufacturer before using this unit with dirty or aggressive
media because the unit needs to be adapted in terms of the parts that come into
contact with the media.
The device can be used as a functional safety components (SIL) as agreed with
the manufacturer (see order code).
The device is to be exclusively used for the applications agreed between the
manufacturer and the user.
2.4 Function diagram
5
6
1
1
2
3
4
+
Fig. 4:
Function diagram
1
Pressure chamber
2
Tappet
3
Micro-switch
4
Switch point setting
5
Measuring diaphragm
6
Measuring springs
2.5 Design and mode of operation
A sturdy non-sensitive diaphragm measuring unit that is suitable for measuring
differential pressure, and over and under-pressure is used as a measuring sys-
tem. The unit uses the same measuring principle for all three measuring applic-
ations.
In the rest position, the spring forces on both sides of the membrane are bal-
anced out. Due to the pressure or under-pressure to be measured, a single-
sided force is created on the membrane which shifts the membrane system
against the measurement range springs up to compensation of the spring
forces. In case of overload, the membrane supports against the metallic support
surfaces.
A centrally positioned tappet transfers the movement of the membrane system
onto the operating elements of the micro-switches.
