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FCB100, FCB400 COMMISSIONING AND PROVING | PG/CORIOLIS/PROVING-EN REV. A
7 Appendix – Pulse output configuration
In some application it is required to use a pulse output instead of a frequency output.
The main difference is that the pulse output provide a constant pulse length. Each pulse has the same pulse length.
1 No modification required. Default is 'Forward'
Digital output 41/42 mode:
Digital output 51/52 mode:
Output value:
Pulse per unit:
Figure 14: Digital output configuration as pulse output
hange from one to two columns
Note
The Totalizer should be set to 'bbl' or 'ugal' too.
In some application it is required to use a pulse output instead
of a frequency output.
The main difference is that the pulse output provide a constant
pulse length. Each pulse has the same pulse length.
The resulting maximum output frequency will be:
Maximum output frequency f
f = (volume flow / T) × pulse per unit
For unit 'bbl'
For unit 'ugal'
Pulse
Impulse Phase Shift 90° to Dig. Out 41/42
Volume flow
Set the required pulses per unit: e.g. 20000 pulse / bbl. For proving please ensure that there are always
sufficient pulses per proving cycle. Ideally these are more than 10000 per proving cycle.
Make sure that the pulse per unit match between the flowmeter and the flow computer
Legend
Qv
Pulse per unit
T
Note
Insure that the settings does not exceed the maximum input
frequency of the prover counter or flow computer.
Example:
(300 bbl/h / 3600 s/h) × 20000 pulse/bbl
= (300 / 3600) × 20000/s
Maximum output frequency = 1666.67 Hz
300 bbl/h
max
20000 / bbl
Factor to calculate the chosen Qv
unit per second
unit down to a
max
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