Displacer Transmitters

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.
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.

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.


MEDIA: Liquids or slurries, clean or dirty, light hydrocarbons to heavy acids (SG=0.23 to 2.20)
VESSELS: Process & storage, bridles, bypass chambers, interface, sumps & pits up to unit pressure & temperature ratings
CONDITIONS: Most liquid level measurement and control applications including those with varying dielectric, vapors, turbulence, foam, buildup, bubbling or boiling and high fill/empty rates. Also, liquid/liquid interface level measurement or density control


SIL 2 suitable with the highest Safety Failure Fraction (SFF) of any displacer transmitter at 92.3%
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 +600° F (+315° 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"
ANSI flanges rated from 150# to 2500# RF
FM/CSA XP, IS and NI approvals / ATEX/IEC XP and IS approvals


XP=Explosion Proof
IS=Intrinsically Safe
ELV=EMC/Low Voltage


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+ Instruction & Operating Manual