Electromagnetic Flowmeter M-910
22
Operation manual
f)
Fixed
current output is adjusted to fixed value (4.000 … 20.000 mA)
QI value represents a flowrate for a current of 20 mA and can be set independently to the nominal diameter of the
sensor. QI value can be changed in
“Setup mode”
after selecting modes “b”, “c”, “d” or “e”. Fixed current value
can be changed in
“Setup mode”
after selecting mode “f”. Following values are pre-set:
Current loop standard factory setting:
Mode
„Positive flowrate“.
QI
flowrate corresponds to maximum required nominal flowrate Q
N
5.2.1.2
Frequency output (1.2 OUTPUT F)
Frequency output is a galvanically isolated transistor NPN switch. Voltage drop on the switch is 1 V in the made
status. Maximum switched voltage is 50 V. Maximum switched current should not exceed 100 mA. Positive output
is on terminal 4, negative output is on terminals 5 and 7 (internally connected). Frequency range of the output is
from 10 Hz to 12 kHz.
The frequency output can be programmed in one of following modes:
a)
Off
output is not active (off state).
b)
Pos.Flow
frequency 1000*Flowrate/QF [Hz] is generated for positive flowrate direction.
c)
Neg.Flow
frequency -1000*Flowrate/QF [Hz] is generated for negative flowrate direction.
d)
Abs.Flow
frequency 1000*abs(Flowrate)/QF [Hz] is generated for both flowrate
directions.
e)
On Pos.
output is off in case of negative flow and made in case of positive flow.
f)
On Neg.
output is off in case of positive flow and made in case of negative flow.
g)
On In
output is on, when flowrate is higher than PF1 and lower than PF2, otherwise it
is off.
h)
On Out
output is off, when flowrate is higher than PF1 and lower than PF2, otherwise it
is on.
i)
Dose On
output is on, when programmed dose is counting, otherwise it is off.
j)
Dose Off
output is off, when programmed dose is counting, otherwise it is on.
k)
On<F2
output is on, when flowrate is lower than PF2, otherwise it is off.
l)
On>F2
output is on, when flowrate is higher than PF2, otherwise it is off.
m)
Fixed
frequency output is adjusted to fixed value (10 … 12000 Hz)
If setting the 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 the 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 g ) with non-zero hysteresis:
Mode h) with non-zero hysteresis:
Mode k) with non-zero hysteresis:
Mode l) with non-zero hysteresis:
PF1 PF1+H
PF2-H PF2
OFF
ON
PF1 PF1+H
PF2-H PF2
OFF
ON
PF2-H PF2
OFF
ON
PF2-H PF2
OFF
ON