Dwyer Series PUF - Manual (Page 39)

3: Operating Procedures
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3.8 Configuring the Current / Pulse Output
The Current/Pulse Output connector provides two output signals that are proportional to the measured fluid flow.
The first is a current signal calibrated to a standard control range (e.g. 4 to 20 mA), and the second is a pulse
output. It is permissible to use both outputs simultaneously.
3.8.1 Current output
Using the instrument’s menu system, the operator can use the following procedures to:
• Select the current output function Off/On.
• Select the current output signal range (4-20mA, 0-20mA, 0-16mA).
• Calibrate the current output signal to a required flow range.
Turning the 4 to 20 mA output OFF/ON
4 to 20 mA signal calibration and ranging
This procedure describes how to calibrate the 4 to 20 mA 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 the ENTER key.
4-20 mA OUTPUT DD-MM-YY HH:MM:SS
4-20 mA O/P is ON Qxx.xx%
mA Output Reading : 0.00
Output Range : 4-20
Units : gal/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 the ENTER key to return to the 4-20mA
OUTPUT screen.
4-20 mA OUTPUT DD-MM-YY HH:MM:SS
Qxx.xx%
Off
4-20mA
0-20mA
0-16mA
Key Point: The 4 to 20 mA 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.
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
Set Date & Time : dd-mm-yy hh:mm:ss
Calibrate 4-20mA
Pulse output
Backlight : Disabled
Factory settings
Change Language
Exit