24
RFT9709 Transmitter Instruction Manual
Viscosity measurement or
pressure compensation
The RFT9709 accepts pressure input signals from a pressure
transmitter for viscosity measurement, pressure indication, or pressure
compensation.
RFT9709 performance
• Using input from a differential pressure transmitter (DP cell), the
RFT9709 can calculate viscosity.
• If a pressure transmitter connected to a host controller measures
gauge pressure at the sensor input, the RFT9709 can compensate for
the pressure effect on the sensor. Pressure compensation is required
only for the sensor models listed in Table 2-3, page 24.
• With a pressure transmitter or DP cell, the RFT9709 primary variable
(PV) and secondary variable (SV) outputs can represent pressure.
• When using the pressure transmitter as part of a HART multidrop
network, the RFT9709 PV output remains fixed at 4 mA.
Pressure transmitter requirements
• The pressure transmitter must be a HART SMART FAMILY device.
• The pressure transmitter can be powered from the RFT9709, or
externally powered as part of a HART multidrop network. See
HART
multidrop network wiring
, page 19.
Multidrop network requirements
• The pressure transmitter must be assigned a unique multidrop address
from 1 to 15.
• The RFT9709 must be assigned a unique multidrop address from 0 to
15. Assigning an address other than 0 fixes the RFT9709 primary
variable (PV) output at 4 mA.
Configuration options
• The pressure transmitter can be configured with a Rosemount Model
275 HART Communicator, attached either to the RFT9709 HART loops
or directly to the pressure transmitter.
• To configure the RFT9709 for pressure compensation or viscosity
measurement, a special version of the ProLink program is required.
The HART Communicator cannot be used for RFT9709 configuration.
(Contact the factory for additional ProLink information.)
Table 2-3.
Sensors affected by
pressure
ELITE
®
BASIS
®
Model D
CMF100
CMF200
CMF300
CMF400
F050
F100
F200
D300
D600
DL100
DL200
09wire.fm Page 24 Monday, March 1, 1999 4:31 PM
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