RFT9709 Transmitter Instruction Manual
41
RFT9709 Specifications
continued
Communication
Switches on the RFT9709 allows selection of the Bell 202 standard for
HART digital communication, and/or the RS-485 serial standard for
HART or Modbus communication.
• Bell 202 signal is superimposed on primary variable mA, and available
for host system interface. Frequency 1.2 and 2.2 kHz, amplitude 0.8 V
peak-to-peak, baud rate 1200 baud. Requires 250 to 1000 ohms load
resistance.
• RS-485 signal is a ± 5 V square wave referenced to transmitter ground.
Baud rates from 1200 baud to 38.4 kilobaud can be selected.
API-2540 standard tables
The RFT9709 calculates both reference and on-line density, and
standard and gross standard volume, based on API equation 2540 for
Generalized Petroleum Products and Generalized Crude Oils. Totalizers
and inventories for gross volume are independent of totalizers and
inventories for gross standard volume.
Compensation accomplished by the following user-specified API-2540
standard tables:
• 5 A/B/D
• 6 A/B/C/D
• 23 A/B/D
• 24 A/B/C/D
• 53 A/B/D
• 54 A/B/C/D
These additional specifications are required:
• For "C" tables (6C, 24C, and 54C), also specify the thermal expansion
coefficient.
• For even-numbered tables (6 A/B/C/D, 24 A/B/C/D, and 54 A/B/C/D),
also specify the reference density.
For tables 53 and 54 (53 A/B/D and 54 A/B/C/D), a reference
temperature of 15°C is used per the API-2540 standard table. The
reference temperature can be changed using the special version of
ProLink software.
Input for pressure
transmitter
The RFT9709 can communicate with a HART SMART FAMILY pressure
transmitter using the Bell 202 physical layer and HART communications
protocol. The pressure transmitter can be externally powered as part of
a HART multidrop network, or powered internally from the RFT9709.
When using the pressure transmitter as part of a HART multidrop
network, the RFT9709 primary variable (PV) output remains fixed at
4 mA.
The pressure transmitter may be configured by a Rosemount Model 275
HART Communicator attached to the RFT9709 HART loops. 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.)
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