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E3 Modulevel® liquid level transmitter

The Digital E3 Modulevel® is an advanced, intrinsically safe two-wire instrument utilizing simple buoyancy principle to detect and convert liquid level changes into a stable output signal. The linkage between the level sensing element and output electronics provides a simple mechanical design and construction. The vertical in-line design of the transmitter results in low instrument weight and simplified installation. The instrument comes in a variety of configurations and pressure ratings for varied applications.

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The product

The Digital E3 MODULEVEL transmitter has microprocessor-based electronics with HART® compatible output, in addition to the standard 4-20 mA output. The E3 MODULEVEL unit supports the FDT/DTM standard and a PACTware™ PC software package allows for additional configuration and trending capabilities.

Displacer transmitter – Technology

Electronic displacer level transmitter technology operates by detecting changes in buoyancy force caused by liquid level change. These forces act upon the spring supported displacer causing vertical motion of the core within a linear variable differential transformer.


  • SIL Certified, SFF value of 90.6%
  • No calibration required; configuration only
  • Available with 4–20 mA and HART® 6.x with PACTware™ PC software and the Field Device Tool (FDT); AMS ready
  • Foundation fieldbus™ option with PID block and Link Active Scheduler (LAS) capability
  • Comprehensive diagnostics with faults, warnings and status history
  • Range spring suppresses effects of turbulence to produce stable output signal
  • Suitable for process pressures up to 5150 psig (355 bar)
  • For use in process temperatures up to +850° F (+450° C) in non-steam applications
  • Explosion-proof, intrinsically-safe and non-incendive approvals from FM, CSA, ATEX and IEC
  • Specific gravity adjustment without stopping process
  • Transmitter head rotatable through 360° and removable without interruption of process
  • Suitable for interface measurement and density detection
  • Electromagnetic compatibility per CE requirement EN 61326
  • Shock and vibration suitable per ANSI/ISA-S71.03 Class SA1 and VC2


  • PACTware PC software
  • Flanged top, cage side/bottom and cage side/side designs
  • Integral or remote mount
  • Process connections from 1 1/2″ to 6″
  • ASME flanges rated from 150# to 2500# RF
  • FM/CSA XP, IS and NI approvals / ATEX/IEC XP and IS approvals
  • Consult factory for B31.1/B31.3/NACE construction

Operating principle

Changing buoyancy forces caused by liquid level change act upon the spring-supported displacer causing vertical motion of the core within a linear variable differential transformer.

As the core position changes with liquid level, voltages are induced across the secondary windings of the LVDT. These signals are processed in the electronic circuitry and used to control the current in the 4-20 mA current loop. The enclosing tube acts as a static isolation barrier between the LVDT and the process media.


ATEX Ex d, Ex ia
EAC (GOST) Ex d, Ex ia, Metrology
IEC Ex d, Ex ia
Inmetro Ex d, Ex ia
Korea Ex d, Ex ia
SIL SIL 2 (1oo1)
Marine Lloyd’s Register of Shipping (LRS)

Other approvals are available. Consult factory for more details.

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