Instrction manual
Operating Procedures
37
Turning the 4-20mA output OFF/ON and selecting the current range
1.
With the instrument operating in the FLOW
READING mode, press the 4-20mA function
key. This will access the 4-20mA OUTPUT
screen.
2.
The ON/OFF status of the 4-20mA output is
shown on line 2 of the display.
3.
To change the ON/OFF status select Output
Range and press the ENTER key.
4.
Select Off, to turn OFF the 4-20mA Output or
select one of the output ranges to turn it ON.
5.
Press the ENTER key to return to the 4- 20mA
OUTPUT screen.
4-20mA signal calibration and ranging
The 4-20mA output has been calibrated in the factory and should not require further
adjustment. In the rare event that re-calibration is necessary, this procedure should be
carried out only by a trained engineer.
This procedure describes how to calibrate the 4-20mA output and ‘scale’ it to operate over a
defined flow-rate range.
Signal calibration
1.
Select Setup Instrument from the MAIN
MENU, to access the SETUP INSTRUMENT
screen.
2.
2. Select Calibrate 4-20mA.
3.
Connect a calibrated ammeter to the 4-20mA
output and adjust the UP/DOWN Scroll keys
(Coarse) and LEFT/RIGHT Scroll keys 5 & 6
(fine) until the output is exactly 4.0mA. The
DAC should indicate approximately 8000.
4.
Press the ENTER key when done.
5.
With the meter still connected to the 4-20mA
output adjust the Scroll keys to obtain an
output of exactly 20mA. The DAC should
indicate approximately 40000.
NOTICE
Summary of Contents for PORTAFLOW 330
Page 1: ...Instruction manual PORTAFLOW 330 Portable Ultrasonic Flowmeter GF Piping Systems...
Page 2: ......
Page 54: ...Notes...
Page 55: ...Notes...
