Magnetrol E4 Modulevel Displacer Level Transmitter

Overview

The Magnetrol E4 Modulevel is a modern, loop-powered displacer transmitter for liquid level, interface and density measurement. Displacer transmitters have been trusted in refineries and power plants for decades because buoyancy is a simple, well-understood principle that is not affected by dielectric, vapor or foam. The E4 refreshes that approach with microprocessor electronics, a graphical display, HART 7 communication and SIL 2 certification, while the mechanical linkage between the sensing element and the electronics remains purely mechanical.

Seven Star LLC supplies the Magnetrol E4 Modulevel to oil, gas, refining, petrochemical and power customers across the Sultanate of Oman and the GCC. Our Muscat team assists with the displacer length, material, flange and chamber selection, and with the retrofit of the E4 transmitter onto existing displacer assemblies.

Operating Principle

The Magnetrol E4 Modulevel uses a displacer supported by a spring. As the liquid level rises, the buoyant force on the displacer increases and the spring compresses, moving a core within a linear variable differential transformer. As the core position changes, voltages are induced in the LVDT secondary windings, and the electronics convert them into a stable output signal. A tube around the core acts as a static pressure barrier between the LVDT and the process.

The same arrangement can follow an interface or a density change. For interface, a custom displacer senses the position of a clean interface or an emulsion layer between two liquids of different density. For specific gravity, the change in mass of liquid displaced causes the core movement that is converted into 4-20 mA. The spring and LVDT design brings a performance benefit over traditional torque-tube displacer transmitters, and no level change is required for configuration, so no field calibration is necessary.

Engineering Design of the Magnetrol E4 Modulevel

The Magnetrol E4 Modulevel has a vertical in-line design with low instrument weight, simplifying installation. The displacer assembly uses a carbon steel or 316/316L flange, a 316/316L enclosing tube, stem and displacer, and an Inconel spring whose alloy depends on process conditions. The physical range can be up to 300 cm (120 inches), based on the displacer length, and units can be mounted on top of a vessel or in external chambers and cages for bridle and bypass installations.

The electronics are housed in die-cast aluminium or stainless steel with a half-inch NPT or M20 cable entry. A four-button keypad and graphic LCD, adapted from the latest Magnetrol transmitter releases, give local configuration, and the E4 supports FDT/DTM through PACTware with trending and diagnostics. Power is 11 to 36 VDC at the terminals, and the unit follows NAMUR NE 43 and NE 107. Several field calibration options are offered, including calibration under process conditions or in the instrument shop.

Key Features

The Magnetrol E4 Modulevel brings a proven principle up to date. Key features of the Magnetrol E4 Modulevel include:

• Spring and LVDT design that offers performance benefits over traditional torque-tube displacer transmitters.
• Level, interface and specific gravity measurement from the same family of instruments.
• Easy commissioning with a local graphic LCD and no level change required for configuration.
• SIL 2 certified as 1oo1 in accordance with IEC 61508.
• HART 7 digital communication with DD and graphical DTM for PACTware.
• Process pressure up to 348 bar and process temperature to +445 °C on non-steam services.
• Linearity of plus or minus 0.5 percent of full span and repeatability of 0.2 percent, with response under one second.
• Order a complete Modulevel (E4M) or retrofit the E4 transmitter onto existing displacer assemblies (E4T).

Industrial Applications

The Magnetrol E4 Modulevel is used on boiler drum and feedwater heaters, high-pressure separators, process and storage vessels, bridles and bypass chambers, sumps and pits. It is a long-standing choice for liquid and slurry service from light hydrocarbons to heavy acids with specific gravity from 0.23 to 2.20, and it stays reliable where vapors, boiling, bubbling or turbulence upset other technologies. In Oman, steam and power plants, refinery separators and gas processing units all rely on external chambers with level instruments that can be serviced without draining the process. Operators who prefer a magnetic indicator on the chamber may compare the E4 with the ABB MagWave dual chamber system or the Tecfluid LT-R153.

Seven Star LLC supplies the Magnetrol E4 Modulevel and its chambers on request, with engineering support in Muscat, for the Sohar and Salalah economic zones and utilities across the GCC. For vessels where a non-buoyancy technology is better, we can offer the Magnetrol Eclipse 706 guided wave radar, and our engineers will compare the technologies against your process conditions.

Technical Specifications

The table lists the main data for the Magnetrol E4 Modulevel from the Magnetrol datasheet. Pressure and temperature depend on the model and the process connection.

Request a Quote for Magnetrol E4 Modulevel

For the Magnetrol E4 Modulevel, send Seven Star LLC the process fluid, specific gravity, operating pressure and temperature, displacer length, flange rating and any chamber or hazardous-area requirement. Our instrumentation division in Muscat will specify the E4M or the E4T retrofit, and provide the Magnetrol datasheet with the quotation. Seven Star LLC supplies Magnetrol equipment with manufacturer documentation and local engineering support across Oman and the GCC, so request your Magnetrol E4 Modulevel quotation today.