3: Operating Procedures
Portaflow 220 User Manual 23
(Issue 1.0)
3.7 Configuring the Portaflow 220 Interfaces
3.7.1 How to turn the 4-20mA output OFF/ON
3.7.2 4-20mA signal calibration and ranging
This procedure describes how to calibrate the 4-20mA output and ‘scale’ it to operate over a defined flow-rate
range.
Signal calibration
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 ENTER.
4-20 mA OUTPUT
DD-MM-YY HH:MM:SS
4-20 mA O/P is ON
Dim: mm
mA Output Reading : 0.00
Output Range : 4-20
Units : l/min
Flow at max. output : 0.00
Flow at min. output : 0.00
Output mA for error : 22.00
Exit
4. Select Off, to turn OFF the 4-20mA Output
or select one of the output ranges to turn it
ON.
5. Press ENTER to return to the 4-20mA
OUTPUT screen.
4-20 mA OUTPUT
DD-MM-YY HH:MM:SS
Dim: mm
Off
4-20mA
0-20mA
0-16mA
Key Point: The 4-20mA output has been calibrated at 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.
1. Select Setup Instrument from the MAIN
MENU, to access the SETUP INSTRUMENT
screen.
2. Select Calibrate 4-20mA.
SETUP INSTRUMENT DD-MM-YY HH:MM:SS
Dim: mm
Set Date & Time : dd-mm-yy hh:mm:ss
Calibrate 4-20mA
Pulse output
Backlight : Disabled
Factory settings
Change Language
Exit
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 ENTER when done.
CALIBRATE 4mA
DD-MM-YY HH:MM:SS
Dim: mm
Adjust the output current to 4mA
Use UV to set, 5/6 to trim
DAC Value: 8000
Press when done
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