Micronics U1000MKII-FM, User Manual

Page: 34 / 56

U1000MKII User Manual Micronics
Page 30 Issue 3.1 July 19
4 OUTPUTS
4.1 Pulse Output
Pulse output can be set up to operate one of five modes:
•
Volumetric
•
Energy (U1000MkII-HM only)
•
Frequency
•
Low Flow Alarm
•
Loss of Flow (Signal) Alarm
The Alarm functions allow you to set the alarm switch to Normally Open or Normally Closed .
4.1.1 Volumetric Pulse
The U1000MKII default pulse width is set to 50ms which represents half of one pulse cycle. A 50ms
pulse width is required for most mechanical counters.
Formula to obtain Volume per Pulse based on a (default) 50ms pulse width:
Volume per Pulse >= maximum flow rate (in litres per minute) / 600
Example for maximum flow rate of 500 l/min:
Volume per Pulse >= 500 l/min / 600 = 0.833 litres per pulse
Rounding up to nearest whole litre:
Set
Volume per Pulse to 1 litre.
4.1.2 Frequency Mode
In Frequency mode, the output frequency is proportional to the flow rate within a specified frequency
range of 1
–
200Hz. The flow units are fixed as litres per second.
Pulse output
switch open
0 50 100 150 200 250 300 350
Time (milliseconds)
Pulse Width
50 milliseconds
Default Pulse Width
Pulse output
switch closed