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Reference Manual
00809-0100-4664, Rev BA
January 2010
4-17
Rosemount 8712
Density Value
The density value is used to convert from a volumetric flow rate to a mass flow
rate using the following equation:
Q
m
= Q
v
3 r
Where:
Q
m
is the mass flow rate
Q
v
is the volumetric flow rate, and
r is the fluid density
PV Upper Sensor Limit (USL)
The PV USL is the maximum value that the 20 mA value can be set to. This is
the upper measuring limit of the transmitter and sensor.
PV Lower Sensor Limit (LSL)
The PV LSL is the minimum value that the 4 mA value can be set to. This is
the lower measuring limit of the transmitter and sensor.
PV Minimum Span
The PV minimum span is the minimum flow range that must separate the 4
mA and 20 mA set point values.
Configure Outputs
The configure outputs functionality contains functionality to configure the
more advanced features that control the analog, pulse, auxiliary, and totalizer
outputs of the transmitter.
Analog Output
Under this function the advanced features of the analog output can be
configured.
PV Upper Range Value (URV)
The upper range value (URV), or analog output range, is preset to 30 ft/s at
the factory. The units that appear will be the same as those selected under the
units parameter.
The URV (20 mA point) can be set for both forward or reverse flow rate. Flow
in the forward direction is represented by positive values and flow in the
reverse direction is represented by negative values. The URV can be any
value from –39.3 ft/s to +39.3 ft/s (-12 m/s to +12 m/s), as long as it is at least
1 ft/s (0.3 m/s) from the lower range value (4 mA point). The URV can be set
to a value less than the lower range value. This will cause the transmitter
analog output to operate in reverse, with the current increasing for lower (or
more negative) flow rates.
Field Comm.
1, 4, 1, 2
LOI Key
AUX. FUNCTION
Field Comm.
1, 4, 1, 3
Field Comm.
1, 4, 1, 4
Field Comm.
1, 4, 1, 5
Field Comm.
1, 4, 2
Field Comm.
1, 4, 2, 1
Field Comm.
1, 4, 2, 1, 1
LOI Key
ANALOG OUTPUT RANGE
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