Design And Measuring Principle - Burkert 8020 Notice D'utilisation

2 SPECIFICATION

2.2 Design and Measuring Principle

Design
The flow sensor consists of a paddle wheel
with ceramic bearings. The ceramic rotating
axis, is set on the end of a PVDF insertion
armature. The transducer is mounted inside
the armature. The output signal is provided
via a 4-pole cable plug according to DIN
43650.
An additional IP65 housing is pluged on the
sensor instead of the cable plug in the
versions with 4...20 mA 4 or adjustable
pulse output 5. The output signals are
available on a terminal strip inside the
enclosure via a PG 9 cable gland.
All parts in contact with the fluid are in PVDF
or ceramic enabling use in aggressive fluids.
Measuring Principle
When liquid flows through the pipe, 4
magnets inserted in the paddle-wheel set
in rotation produce a measuring signal in
the 8020 transducer (coil or Hall Sensor).
The frequency modulated induced voltage
is proportional to the flow velocity of the fluid.
A correlation coedfficient (K-Factor pulse/l)
is necessary to compute the flow rate value.
The correlation coefficient (K-Factor ll/min)
is available in the instruction manual of the
insertion fitting (S020;1500;1501).
A minimum flow velocity from 0.5 m/s (1.6
ft/s); flow value of 5 l/min in a DN15 pipe is
required to ensure the flow measurement.
FLOW SENSOR TYPE 8020
1 The flow sensor 8020 with coil requires
no external power supply . This flow sensor
can be operated with all types of Burkert
flow transmitters/controlers/totalizers
(8025; SE34; 8600; AI21) and others..
2 The flow sensor 8020 with Hall Sensor
requires an external power supply of 12...30
VDC. It is designed for connection to any
system with open collector frequency input
PNP or NPN.
3 The flow sensor 8020 with Hall sensor
"Low Power" is designed for use with Burkert
flow transmitters or indicators (8025; 8021;
8023; 8600; SE34).
4 The flow sensor 8020 with adjustable
frequency output module type 8021 requires
an external power supply of 12...30 VDC. It
is designed for connection to any system
with open collector frequency input PNP or
NPN.
5 The flow sensor 8020 with 4...20 mA
output module, runs in 2-wires system and
requires an external power supply of 12...24
VDC.
E-4- 8020