Product Overview

The ABB FEP311 is an electromagnetic flowmeter within the ProcessMaster FEP300 product family. It is designed for continuous measurement of conductive liquids in industrial process applications and provides a practical solution for flow measurement across a broad range of industries. The FEP311 designation identifies the version without explosion protection, while the related FEP315 version is available for applications requiring specified explosion protection configurations.

The ProcessMaster FEP300 platform uses electromagnetic flow measurement technology and is available in a wide range of nominal diameters, liner materials, electrode configurations and process connections. This flexibility allows the flowmeter to be configured according to the properties of the measured medium and the requirements of the process installation.

Electromagnetic Flow Measurement Principle

ABB FEP311 operates according to the electromagnetic flow measurement principle. When a conductive liquid passes through the magnetic field generated inside the measuring tube, a voltage is induced in proportion to the velocity of the liquid. Measuring electrodes detect this voltage, and the transmitter processes the signal to determine the flow rate.

Because the measurement principle does not require mechanical moving parts inside the measuring tube, electromagnetic flowmeters are suitable for many continuous process applications. The measurement system can be configured for liquids with appropriate electrical conductivity, while the selected liner and electrode materials should be matched to the chemical and physical characteristics of the process medium.

Correct installation is important for stable measurement. Pipeline arrangement, grounding, sensor orientation, pipe filling and process conditions should be considered during system design and commissioning.

ProcessMaster FEP300 Platform

The FEP311 forms part of the ProcessMaster FEP300 electromagnetic flowmeter family. ABB documentation describes the FEP300 as a modular platform intended for process-industry applications. The system can be supplied in integral-mount or remote-mount configurations, depending on the selected device arrangement.

In an integral configuration, the transmitter and sensor are mechanically combined into one unit. In a remote configuration, the transmitter is installed separately from the sensor and connected through the appropriate wiring. The selection between these arrangements depends on installation space, ambient conditions, accessibility and the requirements of the process installation.

Nominal Diameter and Process Connection

One of the important characteristics of the FEP311 platform is its wide range of nominal sizes. ABB documentation specifies nominal diameters from DN 3 through DN 2000, corresponding to approximately 1/10 inch through 80 inches. This range allows the ProcessMaster family to be applied to both relatively small process lines and large industrial pipelines.

Flanged process connections are available according to recognized standards including DIN 2501 / EN 1092-1, ASME B16.5 / B16.47 and JIS, depending on the selected configuration. The appropriate flange specification, pressure rating and nominal diameter must be confirmed from the complete ordering code before installation.

For an existing pipeline, the sensor configuration should be matched to the installed pipe size and flange standard. The nominal pressure rating must also be appropriate for the maximum operating pressure of the process.

Liner and Electrode Selection

The wetted materials are an important part of electromagnetic flowmeter selection. The FEP300 platform supports different liner materials, including hard rubber, soft rubber, PTFE, PFA, ETFE and Linatex configurations depending on the selected device version.

The liner provides the internal surface between the process liquid and the sensor body, while the electrodes provide the electrical interface used to detect the induced measurement signal. The correct combination depends on the conductivity, temperature, pressure and chemical characteristics of the process liquid.

When specifying an FEP311 flowmeter, the complete ordering code should therefore be reviewed rather than identifying the instrument only by the basic FEP311 model name. Different ordering configurations can provide substantially different process interfaces and wetted-material combinations.

Measurement Accuracy

The ProcessMaster FEP300 specification provides a standard measuring value error of 0.4% of rate, with an optional 0.2% of rate configuration depending on the selected version. Actual system performance depends on the complete sensor and transmitter configuration as well as installation conditions and process characteristics.

For applications requiring a defined measurement tolerance, the complete device configuration should be checked against the project specification. Sensor sizing, installation conditions and process stability can all influence practical measurement performance.

Configuration and User Interface

The ProcessMaster FEP300 includes configuration functions intended to simplify setup of the flowmeter. ABB documentation describes through-glass configuration, soft-key based operation and an Easy Set-up function. These functions allow important measurement parameters to be configured without unnecessarily removing the transmitter cover.

The transmitter stores configuration data in its memory. This architecture can simplify transmitter replacement because the stored measurement configuration can be retained depending on the applicable device arrangement and replacement procedure.

During commissioning, parameters should be configured according to the sensor characteristics, process conditions, output requirements and control-system integration. The programmed values should be compared with the engineering documentation before the instrument is placed into normal operation.

Communication and Signal Integration

Depending on the selected configuration, the ProcessMaster FEP300 platform supports industrial communication technologies including HART, PROFIBUS PA and FOUNDATION Fieldbus. These communication options allow measurement information and configuration parameters to be integrated into different automation architectures.

The appropriate communication protocol is determined by the ordered configuration and the requirements of the control system. When replacing an existing flowmeter, the communication interface should be verified carefully because two instruments with the same basic FEP311 designation can have different communication options depending on their complete ordering codes.

Integration with a PLC, DCS or process-control system should follow the electrical connection diagram and communication documentation for the specific transmitter configuration.

Diagnostic Functions

The FEP300 platform provides diagnostic functions intended to assist with process and instrument monitoring. One example is empty-pipe and partially filled pipe detection. These functions can help identify process conditions that may affect the validity of the flow measurement.

Status information and diagnostic messages can also support troubleshooting during operation. Proper interpretation of diagnostic information requires reference to the applicable operating instructions and the actual sensor and transmitter configuration.

For maintenance activities, diagnostic information can help distinguish between process-related conditions, installation issues and instrument-related conditions. The complete measurement loop should be considered rather than evaluating the transmitter independently from the sensor and process installation.

Industrial Applications

ABB FEP311 is intended for a wide range of process-industry applications. The ProcessMaster FEP300 platform is used in sectors such as chemical processing, power generation, oil and gas, pulp and paper, metals and mining, and other industrial process environments.

Typical applications involve measurement of conductive liquids where reliable volumetric flow information is required. The broad selection of liner materials and nominal diameters allows the instrument to be adapted to different process media and pipeline configurations.

Application-specific engineering remains important. The measured liquid must meet the required conductivity conditions, while the sensor materials, pressure rating, temperature range and process connection must be suitable for the installation.

Installation Considerations

Correct mechanical and electrical installation is essential for electromagnetic flow measurement. The sensor should be installed in a location where the measuring tube remains properly filled under normal operating conditions. The pipeline arrangement should minimize conditions that could introduce unstable flow behavior or cause the sensor to operate with an incompletely filled tube.

Grounding and electrical connection requirements should be followed according to the applicable ABB installation documentation. The transmitter and sensor wiring must also correspond to the selected integral or remote configuration.

Before commissioning, verify the nominal size, process connection, liner, electrode material, transmitter configuration, power supply and output or communication interface against the instrument documentation.

Model Identification and Replacement

When identifying an ABB FEP311 flowmeter, the FEP311 model designation provides the basic product-family information, but the complete ordering code is required to determine the detailed configuration. Ordering information can include nominal diameter, process connection, liner, electrodes, transmitter options, communication interface and other configuration parameters.

This is particularly important when replacing an existing instrument. A replacement should be selected according to the complete technical requirements rather than by model family alone. Comparing the instrument nameplate and ordering code with the original engineering documentation can help verify dimensional, electrical and process compatibility.

Technical Summary

ABB FEP311 is a ProcessMaster FEP300 electromagnetic flowmeter designed for industrial process flow measurement. It is the non-explosion-protected version of the FEP31x family and is available in configurations covering a broad range of nominal diameters, process connections, liners and electrodes.

The platform supports integral and remote mounting arrangements, configurable transmitter functions and communication options including HART, PROFIBUS PA and FOUNDATION Fieldbus. Its application range includes chemical, power, oil and gas, pulp and paper, metals and mining and other process industries.

For correct selection and installation, the complete FEP311 ordering code should always be evaluated. Nominal diameter, process connection, liner, electrode material, pressure rating, communication interface and installation configuration must correspond to the requirements of the process measurement system.