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Level transmitters are field instruments that continuously measure the height or volume of liquids, slurries, or bulk solids inside tanks, silos, and vessels, converting that measurement into a proportional output signal such as 4-20 mA with HART, fieldbus, or wireless protocols. The category spans multiple sensing technologies, including non-contacting and guided wave radar, ultrasonic, hydrostatic/differential pressure, capacitance, and radiometric instruments, each suited to different media, vessel geometries, and process conditions. These devices mount on or in vessels and feed data continuously to control systems, enabling real-time visibility of material level across the full measurement range rather than a single point.
This category addresses the need for accurate, continuous, and reliable level data across diverse and often harsh industrial conditions, including turbulence, dust, foam, condensation, extreme temperatures, pressures, and low-dielectric or hazardous media where a single sensing principle cannot serve every application. It supports inventory management, proportional process control, custody transfer, and overfill prevention, helping avoid costly shutdowns, spills, and safety incidents. Built-in diagnostics, safety certifications (e.g., SIL ratings), and remote proof-testing capabilities reduce manual verification efforts and unplanned downtime. By delivering standardized, continuous signals compatible with control and safety systems, these transmitters replace less precise point-level switches or manual gauging, improving operational efficiency, regulatory compliance, and protection of personnel, assets, and the environment.
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by Honeywell
Radar automatic tank gauge combining software algorithms with planar antenna technology for custody transfer and inventory level measurement on large bulk storage tanks. It is TÜV certified for SIL 2/3 overfill protection.

by ABB
Magnetostrictive level transmitters (LMT100, LMT200 external mount) for high-accuracy liquid and interface level detection, including separator and compressor level applications.

by ABB
Non-contact radar level transmitters offering level measurement with simple installation and commissioning.

by ABB
Guided wave radar level transmitter for high-accuracy, reliable level measurement in harsh conditions, with HART and Modbus outputs and SIL 2 certification.

by Honeywell
Guided wave radar level transmitter measuring level, volume and interface of liquids in tanks, silos and process vessels, with a modular design, advanced display and SIL 2/3 certification.

by Emerson
Guided wave radar level and interface transmitter for liquids, slurries and solids, with SIL 2 certification, remote proof test, advanced diagnostics and dynamic vapor compensation.

by Emerson

by Emerson
26 GHz FMCW non-contacting radar level transmitter for challenging liquid and solids applications, with Smart Echo Supervision, Smart Meter Verification and IEC 61508 SIL 2/SIL 3 certification.

by Endress
Endress+Hauser's radar level transmitters: Micropilot free-space radar sensors (80 GHz and other variants) for non-contact continuous level measurement in liquids and bulk solids, and Levelflex guided radar (e.g. FMP51) for liquids, pastes, slurries and interface measurement under extreme process conditions.
by Flowline
Submersible and external hydrostatic pressure sensor transmitters for liquid level measurement in water, wastewater and corrosive chemicals.
by Berthold Technologies
Radiometric level transmitter in 2-wire technology with dual-CPU transmitter unit and scintillation detector (UniSENS rod or CrystalSENS point), for continuous non-contacting level measurement in demanding processes. Successor to the LB 440.
by Flowline
Non-contact 80-GHz radar level transmitters (LR80, LR81, LR83, LR85) for liquids and solids in tanks, sumps, silos and open channels, with 4-20 mA, HART and Modbus outputs.
by Flowline
Ultrasonic level transmitters for non-foaming chemical, water, wastewater and petroleum liquids, in general purpose (EchoPod) and intrinsically safe (EchoTouch) versions, with reflective ultrasonic technology that tolerates condensation.
by Flowline
26-GHz pulse radar level transmitters for liquids and solids, in general purpose (EchoPulse) and intrinsically safe (EchoPro) versions, with 4-20 mA and HART output.
by Flowline
Guided wave radar liquid level transmitters with rod or coaxial probes for day tanks, process tanks and sumps.
by Magnetrol
Loop-powered 24 VDC guided wave radar level transmitter that works with a wide range of interchangeable probes for liquids from light hydrocarbons to water-based media. It is SIL 2/3 capable and offers HART, FOUNDATION fieldbus, PROFIBUS PA and Modbus outputs.
by FineTek
A range of continuous level transmitters for liquids, slurries, powders and bulk solids, including RF-admittance, ultrasonic, guided wave radar, FMCW radar, magnetostrictive, by-pass float and pressure-based models.
by KROHNE
Contact guided radar (TDR) level transmitters for continuous level and interface measurement of liquids and solids, including high temperature and pressure and nuclear variants.
by KROHNE
Non-contact FMCW radar (24 GHz and 80 GHz) level transmitters for continuous level measurement of liquids, pastes, granulates and powders, with ranges up to 100 m and 4...20 mA HART output.
by Magnetrol
24 VDC loop-powered non-contact radar level transmitter for liquids, with a range up to 30 m and an 80 GHz operating frequency. It provides level, volume or flow output with proactive diagnostics.
by Berthold Technologies
Next-generation highly sensitive radiometric measurement system with safety and diagnostic features, SIL-capable, for level, density and concentration measurement, allowing low source activities.
by VEGA
Radar level sensor for continuous, non-contact level measurement of liquids and bulk solids under all process conditions. It combines the previous 80 GHz, 26 GHz and 6 GHz VEGAPULS sensors in one device.