2 how to stop the totalizer temporarily, 7 configuring the current / pulse output, 1 current output – Dwyer Series PUB User Manual

Page 28: Turning the 4 to 20 ma output off/on, 4 to 20 ma signal calibration and ranging, Ragraph 3.7, Operating procedures

3: Operating Procedures

3.6.2 How to stop the totalizer temporarily

If you want to stop the totalizer temporarily for operational reasons, set the

Totalizer option to Stall in the

FLOW READING OPTIONS screen as described above. This will stop the totalizer operation without affecting its
current values.

3.7

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.

3.7.1 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.

With the instrument operating in the

FLOW

READING mode, press the 4-20mA function key.
This will access the

4-20mA OUTPUT screen.

The ON/OFF status of the 4-20mA output is
shown on line 2 of the display.

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

Select

Off, to turn OFF the 4-20mA Output or

select one of the output ranges to turn it ON.

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 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.