Product Specifications Model CFT51 Digital Coriolis Mass Flow and Density Transmitter with HART® or Modbus™ Communication Protocol The Foxboro® Model CFT51 Digital Coriolis Mass Flow and Density Transmitter combines with any Foxboro CFS mass flowtube to form a Foxboro Mass Flow and Density Meter. The CFT51 uses HART® or Modbus™ protocol for remote communications. The CFT51 provides the features listed below. FEATURES ► Patented digital signal processing (DSP) techniques allow: - Continuous 2-phase measurement. - Partial empty tube conditions. - Start-from-empty batching. - On-line flowtube verification. - On-line pressure compensation. ► User-configurable, externally powered I/O types isolated from each other include: analog current output and alarm, frequency or scaled pulse output, contact output, contact input. ► User-selectable HART (versions 5, 6, and 7) or Modbus communication via LCD indicator pushbuttons. ► Remote communication with HART communicator or PC-based configurator. ► Local configuration via indicator with pushbuttons. ► Available for ac or dc supply voltage applications. ► Transmitter is compatible with CFS10, CFS20, and CFS25 flowtubes, and backward compatible to existing CFS10 and CFS20 installations. ► Custody transfer applications: - Quadrature pulse output. - Tamperproof Sealing option for housing and terminal block covers. - Weights and Measures Custody Transfer (NTEP) option. - Weights and Measures Industry Canada Approval option. ► Enclosure can be remote-mounted to a surface, or DN80 (3 inch) or DN50 (2 inch) pipe. ► Enclosure meets NEMA 4X and IEC IP66/67 ratings. ► Transmitter certified for use in hazardous area locations. Agency plate includes CE mark.

This mass flow and density meter, comprising a CFT51 mass flow and density transmitter and a Foxboro CFS mass flowtube, measures fluid mass flow rate directly, not inferentially. Direct measurement of mass eliminates the inaccuracies of multiple process measurements associated with volumetric flow devices. The Model CFT51 Digital Coriolis Mass Flow and Density transmitter is an advanced generation of mass flow devices using DSP (digital signal processing) technology, which allows this transmitter to provide improved performance over other Coriolis flowmeters. Ideally suited for tank and railcar...

Configuration and reranging can be accomplished remotely with the communicator or PC-based configurator, or locally with the LCD indicator with pushbuttons. MODBUS COMMUNICATION PROTOCOL Communication with host processors is made using the Modbus RTU (Remote Terminal Unit) mode over a 2-wire RS-485 multidrop serial connection. The CFT51 uses the Modcom RTU mode, rather than the ASCII mode, for communication. The main advantage of the RTU mode is that its greater character density allows better data throughput than ASCII for the same baud rate. Each message must be transmitted in a continuous...

OPERATING, TRANSPORTATION, AND STORAGE CONDITIONS a. Values in the table apply when all transmitter covers have been properly installed and unused openings plugged according to installation instructions. b. Including condensation. c. If the temperature is between -20 and -40°C, the display may go blank, but the device is still operational. d. Refer to the Electrical Safety Specifications section for a restriction in ambient temperature limits with certain electrical approvals and certifications. e. Conditions producing sustained condensate are not allowed. f. Minimum load required with HART Communicator...

1 Performance specifications are stated at reference operating conditions (unless otherwise specified) using Foxboro-supplied cables with the output averaged for one minute. 2 All transmitters and tubes are interchangeable provided that the tube calibration parameters are loaded into the transmitter. 3 Performance specifications apply to the flowtube and transmitter combined as a flowmeter system. 4 The performance specifications apply to all transmitter outputs with the following exception: The current output stage adds a maximum error of ±0.1% of the reading or less than 0.001% of meter capacity,...

Pressure Compensation Although Foxboro flowtubes have thick walls, at elevated pressures, there is a small effect on accuracy due to pressure. CFT51 has a built in feature which allows pressure compensation for density and mass flow measurement, either by configuration or online pressure compensation. The CFT51 supports both static and dynamic pressure compensation. Static compensation requires that the user enter a pressure value which will be stored in internal non-volatile memory and then applied during measurement calculations. Dynamic compensation requires that an external communication...

Power Requirements(1) ac SUPPLY Supply Voltage: 102 to 264 V ac, 120/240 V ac Nominal Supply Frequency: 47 to 63 Hz, 50/60 Hz Nominal Power: 20 VA maximum dc SUPPLY Supply Voltage: 10 to 36 V dc, 24 V dc nominal Power: 15 W maximum Operating Current: 1 A Start-up Current: 3 A Configurable Outputs ► Direct Mass Flow Rate ► Volumetric Flow Rate ► Totalized Mass Flow Rate ► Totalized Volumetric Flow Rate ► Process Fluid Density ► Temperature ► Bidirectional Flow ► Percent Solids/Concentration ► Net Flow, Component A, Component B ► Brix and Baume Scales Digital Communications The digital communication...

Transmitter I/O The transmitters nondigital communications I/O are user-configurable. These inputs/outputs are isolated from each other and must be externally powered. The following nondigital I/O types are available: ► Analog Current Outputs ► Analog Current Output Alarm ► Frequency or Scaled Pulse Outputs ► Quadrature Pulse Output ► Contact Output - Configurable ► Contact Input - Configurable Analog Current Outputs There are three independent, 4 to 20 mA outputs. HART communication is provided on the first current output. All transmitter I/Os must be externally powered. Specifications are: ►...

Contact Output - Configurable A contact output is provided and configurable as: ► Hi-Lo Level Alarm Indicator ► Diagnostic Alarm Indicator ► Alarm/Diagnostic Indicator Specifications are as follows: ► Type: Relay, 1 Form A (Isolated) ► Supply Voltage: 24 V dc ±10% ► Current Rating: 100 mA maximum A contact input is externally powered and configurable as: ► A 4 to 20 mA Output Lock ► An External Totalizer Reset ► Initiate a Flow Zero ► Select a Zero Flow Value Specifications are as follows: ► Type: Requires current linking device such as contact closure or transistor switch between terminal block...