2 | Product and functional description
FISCHER Mess- und Regeltechnik GmbH
8
BA_EN_MS11
2.3 Intended use
The MS11 contact manometer is a combined measuring and switch device for
pressure measurements under difficult conditions, such as pressure impacts, vi-
brations, frequent switch processes or high requirements on the switch perform-
ance.
The device is suitable for gaseous media and fluid media. 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
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2
3
4
5
6
7
1
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Fig. 8:
Function diagram
1 Pressure chamber
2 Motion train
3 Tappet
4 Micro-switch
5 Switch point setting
6 Measuring diaphragm
7 Measuring springs
2.5 Design and mode of operation
The basis for this measurement and switch unit is a sturdy non-sensitive dia-
phragm measuring unit that is suitable for measuring over and under-pressure.
In the rest position, the spring forces on both sides of the membrane are bal-
anced out. Due to the pressure or underpressure 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
on the motion train and operating elements of the micro-switches.
