Electromagnetic Flowmeter
BF
M921
BASI
28
Operation manual
5.1.4
Status (relay) output
Status output is operated by a relay. Maximum switched
voltage is 110 VAC or DC, maximum switched current is
1A, maximum switched power is 30W (whichever
condition occurs first). Positive output is on terminal REL,
negative output is on terminal COM. Current must be
limited by an external circuit.
Note 1: Frequency, impulse and status outputs are
galvanically connected to each other and
galvanically isolated from other electronic
circuits.
Note 2: Active status output uses the power supply of the
current output. Total current consumption from
this power supply must be less than 40 mA. Active
frequency output is galvanically connected to
current output.
Note 3: In case of using this output as a passive, external
source and current limiting is necessary.
5.1.4.1
Mode
Status output can be programmed in one of the following
modes:
a)
Off
output is not active (HI state).
b)
On Positive
output is HI in case of negative flow and LO in case of positive flow.
c)
On Negative
output is HI in case of positive flow and LO in case of negative flow.
d)
On In
output is LO, when flowrate is higher than PF1 and lower than PF2,
otherwise it is HI.
e)
On Out
output is HI, when flowrate is higher than PF1 and lower than PF2,
otherwise it is LO.
f)
Dose On
output is LO, when programmed dose is being measured and HI when the
dose is out.
g)
Dose Off
output is HI, when programmed dose is being measured and LO when the
dose is out.
h)
On>F1
output is LO, when flowrate is higher than PF1, otherwise it is HI.
i)
On<F1
output is LO, when flowrate is lower than PF1, otherwise it is HI.
j)
Error On
output is LO, when an error is indicated
k)
Error Off
output is HI, when an error is indicated
If setting of flow limit is chosen, hysteresis H can be set too. Hysteresis is a tolerance field on one side of
flow limits PF1 and PF2. The output status changes (indicates crossing over pre-set limit), when the
immediate flowrate crosses over the value PF2 (or goes below limit PF1). The output status comes back to
the default status, when the immediate flowrate decreases under the value PF2-H (or increases over limit
PF1+H) again.
Mode d) with non-zero hysteresis:
Mode e) with non-zero hysteresis:
Mode h) with non-zero hysteresis:
PF1 PF1+H
PF2-H PF2
OFF
ON
PF1 PF1+H
PF2-H PF2
OFF
ON
PF1 PF1+H
OFF
ON
