3: Operating Procedures
U3000/U4000 User Manual 27
(Issue 2.0)
3.4.3 Alarm outputs
Both the U3000 and U4000 models contain two programmable alarm outputs that are interfaced by opto-
isolated relays. The relay contacts are rated at a 48V (maximum voltage across the open contacts) and
500mA (maximum continuous current through the closed contacts).
The two alarm outputs can be individually configured to operate in one of four 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.
Alarm configuration
1. To setup Alarm 1 select Alarm1 Mode and
press ENTER. This will access the ALARM1
MODE menu screen (shown below).
2. Scroll down the menu to the required alarm
operating mode and press ENTER to select.
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
Totaliser : 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
Exit