Description; Conversion Of The Flow Velocity Into A Flow Rate - Factor K - Burkert 8041 Manuel Utilisateur

1.3 DESCRIPTION

The 8041 is a magmeter measuring a flow velocity and made up of an electronic module
and a stain less steel sensor. It is fitted with a 4-20 mA current output, a pulse rate output
and a relay output.
The flow velocity is visualized by a 10-led bargraph located on the electronic board.
The following parameters can be programmed by means of 5 switches, a push-button
and a 10-led bargraph:
- "zero flow" point
- measuring full scale
- relay output parameters
- frequency delivered by the mains
- filtering of the flow velocity measurements
1.4 CONVERSION OF THE FLOW VELOCITY INTO A FLOW RATE -
FACTOR K
The 8041 measures the flow velocity (in m/s) of the medium and converts it into a current
(in mA) and a frequency rating (in Hz).
The current I or the frequency f are proportional to the flow rate Q (l/s); The proportional-
ity factor is called "factor K":
The following formulae make it possible to calculate the K factor which is necessary to
convert the flow velocity, i.e. current or fre quen cy value, into a flow rate:
Full scale
K = K factor of the fitting S020 (to be taken from the instruction manual of the S020
fitting
fitting)
INTRODUCTION
f = K .Q
1
I = K .Q + 4
2
Factor K
100
K =
10 m/s
1
K
200
K =
5 m/s
1
K
500
K =
2 m/s
1
K
4
Factor K
1 2
20
K =
2
3.K
fitting fitting
40
K =
2
3.K
fitting fitting
100
K =
2
3.K
fitting fitting
8041