Lake Monitors Flow Transmitters - Manual (Page 37)

User Adjustments
The 4-20 mA, 0-5V, and 0-2000 Hz square wave outputs on the Lake
Monitors Flow Transmitter are all factory calibrated. User adjustment
should be unnecessary and any adjustment of the potentiometer on
the signal conditioning board is strongly discouraged. If one of the
outputs does fall out of calibration, the following procedure may be
used to recalibrate the unit.
1) Turn off the flow through the system.
2) Connect between +12 and +35 VDC to pin 1 of the din connector.
Connect terminal 2 of the din connector to the negative terminal
of the DC supply.
3) Move the programmable jumper on the signal conditioning
board into the position closest to the sensor’s inlet, as shown in
Illustrations 5 and 7.
4) Connect the positive terminal of a voltmeter to pin 3 of the din
connector. Connect the negative terminal to pin 2 of the din
connector.
5) 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).
6) Adjust the 0-5 VDC Span potentiometer until a reading of
5.00 VDC is obtained on the voltmeter.
7) Turn off the flow through the system and remove the voltmeter.
8) Move the programmable jumper on the signal conditioning board
into the position closest to the sensor’s outlet, as shown in
Illustrations 3 and 9.
9) Disconnect pin 1 of the din connector from the positive terminal of
the DC power supply.
10) Connect the positive terminal of an ammeter to the positive
terminal of the DC power supply. Connect the negative terminal
of the ammeter to pin 1 of the sensor’s din connector.
11) Adjust the 4-20 mA Offset potentiometer (See Illustration 1) until
a reading of 4.00 mA is obtained on the ammeter.
Page 37 / Flow Transmitters / Lake Manual