Lake Monitors Flow Transmitters - Manual (Page 38)

12) Gradually increase the flow through the system until the flow rate
indicated on the printed flow rate scale reaches full-scale (the
highest value printed on the scale).
13) Adjust the 4-20 mA span potentiometer (see Illustration 1) until a
reading of 20.00 mA is obtained on the ammeter.
14) Gradually decrease the flow through the system until a value
equal to 50% of full-scale is obtained on the sensor’s flow rate
scale. Verify a reading of between 11.92 and 12.08 mA.
Page 38 / Flow Transmitters / Lake Manual
Trouble Shooting
Symptom Solution
The green LED does not
illuminate when power is
applied.
1) Re-check the wiring diagram for the
communication protocol that is being
used and verify that the wiring is correct.
2) Verify that the DC supply that is being
used is capable of producing at least
12 VDC.
3) Make sure that the cable that is
soldered to the din connector inside
of the sensor enclosure is plugged
into the connector opposite to the
programmable jumper.
The readings obtained from the
electronic output do not agree
with the readings shown on the
printed flow rate scale. 1) Make sure that the programmable
jumper is in the correct position for
the communication protocol that is
being used.
The green LED illuminates, but
no readings are obtained from
the sensor’s electronic output.
1) Re-check the wiring diagram for the
communication protocol that is being
used and verify that the wiring is correct.
2) Make sure that the cable from the sensor
assembly is plugged into the connect on
the signal conditioning board located
near the sensor inlet.
When the flow rate in the
systems changes, the follower
and electronic output do not
respond.
1) Remove the flow sensor from the
hydraulic systems and inspect the
intervals to see if anything has caused
them to become jammed. Make sure
that the 200 mesh, 74 micron filtration
requirement of the flow sensor is being
observed.