GF U1000 V2 Wallmount WM Instrucciones De Uso página 21

User Manual
5.6 Volumetric pulses
The GF U1000 V2 WM/WHM default pulse width is set to 50ms which represents half of one pulse cycle. A 50ms pulse width is
required for most mechanical counters.
Pulse output
switch open
Pulse output
switch closed
0 50
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.
• After a measured volume of 10 l (preset value), a pulse is sent => 1 pulse/10 l.
• The maximum number of pulses that can be sent without storing is calculated using the two default parameters Vol per
pulse =1 and Pulse width = 50 ms, with the formula 1/(0.025x2) giving a value of 20 pulses/s.
• If the volume flow in the pipe is so high that more than 20 pulses/s are generated, a pulse overload error may occur if the
number of stored pulses exceed a value of 1,000.
5.6.1 Frequency mode
In Frequency mode, the output frequency is proportional to the flow rate within a specified frequency range of 1 – 200Hz.
5.6.2 Energy pulse (HM versions only)
When the Pulse Output is set to Energy, the kWh LED will be permanently illuminated. Choose from 1, 10,100kWh or 1MWh when
in metric mode and 1, 10,100kBTU or 1MBTU in imperial mode. Each pulse represents an amount of energy e.g. 1kWh. The same
limitation on maximum pulse rate applies as detailed in the Volumetric Mode. Again, a larger unit of energy per pulse or a smaller
pulse width may be required.
5.6.3 Flow alarm – low flow
For the Low Alarm the user can set a range between 0 and 9999 (no decimal places), in the same units being used to measure flow.
The default setting is normally open, but the user can select between N/O and N/C. There is a 2.5% hysteresis on the switching of
the output. Once the low flow alarm is activated, the flow rate must rise by 2.5% more than the set value to deactivate the alarm
again.
Pulse Width
50 milliseconds
100 150 200 250
Time (milliseconds)
300 350
Electrical connection & outputs
21