4-11
Device Software Functions
Example
The external counter is ranged for 350 gpm and pulse is set for one
gallon. Assuming the pulse width is 0.5 ms, the maximum frequency
output is 5.833 Hz.
Example
The upper range value (20 mA) 3000 gpm. To obtain the highest
resolution of the pulse output, 1000 Hz is scaled to the full scale
analog reading.
Special Units
The Model 8712C/U/H provides a selection of standard units
configurations that meet the needs of most applications (see Flow Rate
Units on page 4-6). If your application has special needs and the
standard configurations do not apply, the Model 8712C/U/H provides
the flexibility to configure the transmitter in a custom-designed units
format using the special units variable.
NOTE
Line size must be selected prior to configuration of special units. If
special units are configured before line size is selected, the
communication interface may not display the correct flow rate.
User-Defined Volume Unit
Special volume units enables you to display the volume unit format to
which you have converted the base volume units. For example, if the
special units are abc/min, the special volume variable is abc. The
volume units variable is also used in totalizing the special units flow.
Base Volume Unit
Base volume unit is the unit from which the conversion is being made.
Set this variable to the appropriate option.
Frequency
Flow Rate (gpm)
(60 s/min)(Pulse Scaling gal/pulse)
--------------------------------------------------------------------------------------=
350 gpm
(60 s/min)(1 gal/pulse)
-------------------------------------------------------=
5.833 Hz=
Pulse Scaling
Flow Rate (gpm)
(60 s/min)(Frequency)
------------------------------------------------------=
3000 gpm
(60 s/min)(1000Hz)
-----------------------------------------------=
0.05 gal/pulse=
1 Pulse 0.05 gallon=
HART Fast Keys 1, 3, 2, 2
LOI Key Aux. Function
HART Fast Keys 1, 3, 2, 2, 1
LOI Key Aux. Function
HART Fast Keys 1, 3, 2, 2, 2
LOI Key Aux. Function
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