5 Function description
5.1 Functional principle
5 Function description
5.1 Functional principle
5.1.1 Usage
The electronic unit is designed for use with a KRAL flow meter.
Flow meters generate a specific number of pulses per flow volume unit –depending on the size and
working point. This device-specific characteristic is called the K factor (unit: pulses/litre) and is spe-
cified on the calibration certificate.
The pulse signals from a flow meter can be evaluated. Due to the pull-down resistor at the signal input,
the following signals are available:
o PNP / push-pull / active signals
o Namur
5.1.2 Volume measurement
The instantaneous value of the flow rate is calculated and displayed by measuring the time between a
series of pulses and the stored K-factor. In addition, the total number of measured pulses can be used
to display the total flow (volume) as a total value since the last reset of the unit. Values for the flow rate
represent the current instantaneous values, total values correspond to the totals since the last reset.
5.1.3 Electronic evaluation
The electronic unit receives signals from the pick up and calculates the measurements, which are
shown in the display and can be called up at the pulse output.
Electronic unit options:
o Display the measured volume in different units (l, m
³
, kg, lb, gal, galUS, bbl)
o Fault information
o 1 scalable pulse output (non-isolated transistor)
o 1 scalable analogue output
5.1.4 Applications
The electronic unit is intended for use in a single-line measurement in combination with a flow meter.
Single-line measurement Components Functions
o 1 flow meter
o 1 pick up
o 1 electronic unit BEM 200
o Electronic evaluation
o Volume measurement
o 1 pulse output, passive
o 1 analogue output, passive
Tab.2: Single-line measurement
8
OIE 24en-GB Edition 2022-01
Operating instructions
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