Dwyer UFC User Manual download pdf (Page 34)

3: Operating Procedures

How to turn the pulse output OFF/ON

7. With the instrument operating in the FLOW

READING mode, press the Pulse function key

to access the PULSE OUTPUT menu.

8. Select Output and press ENTER.

9. Select On and press ENTER.

10. A Pulse output is ON message will appear in

the second line of the display.

11. Select Exit and press ENTER to return to the

FLOW READING screen.

3.4.3 Alarm outputs

The UFC provides two programmable alarm outputs that are interfaced by opto-isolated relays. The relay

contacts are rated at a 48 V (maximum voltage across the open contacts) and 500 mA (maximum continuous

current through the closed contacts).

The two alarm outputs can be individually configured to operate in one of five modes:

• Activate at a predefined Low or High flow rate.

• Activate when a specified Volume is measured.

• Activate if a signal error is detected – either due to poor signal strength or complete signal loss.

• Alarm Test mode.

• Pulse Frequency output.

Alarm settings selection

1. To access the The ALARM SETTINGS menu

select Alarm Settings from the FLOW

READING OPTION menu and press ENTER.

2. The ALARM SETTINGS screen should be

displayed, as shown below.

This screen shows two parameters (Mode and

Limit) that can be individually set for Alarm 1

and Alarm 2.

PULSE OUTPUT DD-MM-YY HH:MM:SS

Pulse output is ON

Flow units : gallons

Output : Off

Vol per pulse : 10.00

Pulse width (ms) : 10

Exit

FLOW READING OPTION DD-MM-YY HH:MM:SS

Data review

Zero Cutoff (m/s) : 0.010

Set zero flow (m/s) : 0.000

Damping (secs) : 10

Totalizer : Run

Reset +Total

Reset –Total

Calibration factor : 1.000

Roughness factor : 0.010

Alarm Settings :

Max Pulse Freq (Hz) : 10.00

Flow at Max Frequency : 200.00

Calculated Pulse Value: 2.00

Diagnostics

Select Totals : +Total

Exit

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