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6
Clamp-on Ultrasonic Flow
Flow
0.
Scale factor
Refers to the ratio between
“
actual value
”
and
“
reading value
”
. For
example, when the measurement is 2.00, and it is indicated at 1.98 on the
instrument, the scale factor constant is 1.01.
1.
4 … 20 mA CAL：Check if the current loop has been calibrated
before leaving the factory. Press
move
to display 4 mA
or 24 mA, and at the same time, check with an ammeter to
verify that Current Loop output displayed values. It is necessary to re-calibrate the
current loop, if over the permitted tolerance.
2.
Set zero Press
; reset
“
Zero Poin
t”
which was set by the
user.
3.
Low flow cut：Flow rate falls below the low flow cutoff value.
The flow indication is driven to zero. This function can prevent the flow meter from
reading flow after a pump as shut down but there is still liquid movement in the pipe,
which will result in totalization error.
Generally, 0.03 m/s is recommended to enter as the low flow cutoff point. The low flow
cutoff value has no relation to the measurement results once the velocity increases over
the low flow cutoff value.
Setup Menu-Output
Press
, Select 3. Output setting, and then
display：
0.
RS-485 setup
The window used to set serial port. It connection with the equipment of
its serial port set of parameters must match. The first choice of data that
baud rate：2400, 4800, 9600, 19200 choice. The second option that in check, None.
Data length fixed to eight; Stop bit for a fixed length; Factory serial port parameters
for the default
“
9600, 8, None, 1
”
.
1.
4 ... 20 mA range
Set the Current loop output value according to the flow
value at 4 mA, and 20 mA. The flow unit is m
3
/h.
2.
Alarm value (Option)
Enter the low alarm value; any of the measured flow, which is lower
than the low value, will activate the alarm in the OCT hardware or relay
output signal. Enter the high alarm value; any of the measured flow, which is higher
than the high value, will activate the alarm in the OCT hardware or relay output
signal.