Dwyer UFB - Manual (Page 32)

3: Operating Procedures
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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 UFB 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 * *
Pulse output is ON
Flow units : gallons
Output : Off
Vol per pulse : 10.00
Pulse width (ms) : 10
Exit
FLOW READING OPTION * *
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