Table of Contents
Advertisement
Design and principle of operation
2 Design and principle of
operation
The Media 05 Differential Pressure and Flow
Meter is used to measure and indicate the
differential pressure or derived measuring
variables for gases and liquids. Typical
application include liquid level measurement
on pressure vessels, differential pressure
measurement between flow and return flow
pipes, pressure drop measurement on valves
and filters as well as flow rate measurement
according to the differential pressure
method.
The device comprises a differential pressure
cell including a measuring diaphragm and
range springs as well as an indicating unit
including a pointer mechanism and dial
plate.
The differential pressure ∆p = p
produced at the orifice plate creates a force
at the measuring diaphragm (1.5), which is
opposed by the range springs (1.4).
The movement of the measuring diaphragm
and lever (1.8), which is proportional to the
differential pressure, is routed from the pres-
sure chamber by a flexible disk (1.9) and
transmitted to the pointer mechanism (2.2).
The differential pressure is shown linear on
the dial and the flow rate is shown as a
square root graduation.
Version with limit contacts
The gear segment (2.1) supports the metal
tags (3.1) and activates the alarm contacts
by moving the metal tags into the adjustable
proximity switches (3.2).
8
When the metal tag enters the inductive field
of the associated proximity switch, it as-
sumes a high resistance (contact open).
When the metal tag leaves the inductive
field, it assumes a low resistance (contact
closed).
The switching function is triggered when the
metal tag leaves or enters the proximity
switches (depending on the setting of the
contacts).
– p
1
2
EB 9520 EN
Advertisement
Table of Contents
