Xylem Magflux Electromagnetic Flow Meter - Manual (Page 80)

80 EN 3.05 MagFlux Manual 1212
Electromagnetic Flow Meter
Limitation of the automatic batch counter on DO 1 (Opto Relay)
The maximum limit is 500 pulses pr sec at 1 ms pulse length.
The formula for the minimum flow unit pr pulses is:
(flow at 20mA) x (pulse delay in mSec) / 1800000
Example: Min. flow unit/pulses for DN 100 max. flow 300 m3/h ?
Minimum flow unit pr pulses = 300 m
3 x 100 mSec / 1800000 =
0,016 m 3 which is rounded to 0,1 m 3 by the MagFlux.
The formula for the maximum flow unit pr pulses is:
(flow at 20mA)
Example: DN 100 max. flow 300 m 3 /h ?
Maximum flow unit pr pulses = 300 m 3
Limitation of the automatic batch counter on DO 2 (mech. relay)
The maximum limit is 120 pulses pr hour.
The formula for minimum flow unit pr pulses is:
(flow at 20mA) / 120
Example: DN 100 max. flow 300 m 3 /h ?
Minimum flow unit pr pulses = 300 / 120 = 2,5 m 3
The formula for maximum flow unit pr pulses is:
(flow at 20mA)
Example: DN 100 max. flow 300 m3/h ?
Maximum flow unit pr pulses = 300 m
3
Limitation of the manual and adaptive batch counter on DO 1 or DO 2
The formula for minimum flow unit pr pulses is:
(flow at 20mA) / 360
Example: DN 100 max. flow 300 m 3 /h ?
Minimum flow unit pr pulses = 300 / 360 = 0,833 m 3