Endress Hauser Liquid Level Transmitter
Product Overview
The Endress+Hauser Liquid Level Transmitter portfolio covers several measurement technologies for continuous liquid level measurement in industrial process applications. Common configurations include Micropilot free-space radar, Levelflex guided wave radar, and hydrostatic level measurement solutions such as Deltapilot.
These technologies address different tank designs, media characteristics, installation conditions, and measurement requirements. Depending on the selected instrument, applications can include continuous level measurement, inventory monitoring, interface measurement, and process control.
The transmitter is selected according to the measurement principle, process medium, measuring range, process temperature and pressure, tank geometry, process connection, communication interface, hazardous-area requirements, and required wetted materials.
Because specifications vary by instrument family and model, the exact technical configuration should be confirmed against the applicable model or ordering code before purchase.
Measurement Technologies & Working Principles
Micropilot Free-Space Radar: Micropilot instruments use non-contact radar measurement to determine the distance between the transmitter and the liquid surface. Because the measurement is performed without a probe extending into the process medium, free-space radar can be considered for applications where contact with the medium is undesirable or where tank geometry and installation conditions favor non-contact measurement. The appropriate radar frequency, antenna, process connection, and configuration depend on the selected Micropilot model and application.
Levelflex Guided Wave Radar: Levelflex uses Time Domain Reflectometry (TDR) with a guided probe. The radar signal travels along the probe and reflections are evaluated to determine the level. Guided wave radar can be selected for applications requiring continuous level measurement and, on supported configurations, interface measurement. Probe type, probe length, process connection, coating, and other configuration details must be matched to the vessel and process medium.
Deltapilot Hydrostatic Level Measurement: Deltapilot instruments use hydrostatic pressure measurement to determine liquid level based on the pressure generated by the liquid column. This measurement principle can be used for open or closed vessels where the required pressure measurement configuration is compatible with the process conditions. The measuring cell, pressure range, process connection, and wetted materials should be selected according to the medium and operating conditions.
The transmitter processes the measured signal and provides a standardized output for connection to plant control and monitoring systems.
Depending on the selected model, configuration and diagnostic functions may be available through local operation, digital communication, or compatible Endress+Hauser engineering and asset-management tools. Available interfaces and configuration methods are model dependent and may include:
Local display and operating controls
HART communication
PROFIBUS PA
FOUNDATION Fieldbus
Bluetooth or other supported wireless configuration functions
Endress+Hauser configuration and asset-management software
The communication interface should be selected according to the existing DCS, PLC, instrumentation, and asset-management architecture.
Key Features
Micropilot radar transmitters provide non-contact measurement, eliminating the need for a sensing probe to extend into the liquid for supported applications.
Levelflex provides guided radar measurement using a probe installed in the vessel or bypass arrangement. Depending on the model and configuration, it can support continuous level and interface measurement.
Deltapilot provides hydrostatic level measurement based on liquid head pressure. This makes it suitable for applications where pressure-based level measurement matches the vessel and process configuration.
Selected instruments provide device diagnostics and status information for integration into plant instrumentation and asset-management systems. Where supported, diagnostic information can be categorized according to applicable device diagnostic standards such as NAMUR NE 107.
Depending on the instrument family and model, available process connections can include threaded, flanged, and hygienic connection options. The connection standard, pressure rating, dimensions, and wetted materials should be confirmed against the exact ordering configuration.
Technical Specifications & Selection Parameters
|
Technical Parameter |
Specification Matrix & Selection Guidelines |
|
Measurement Principle |
Free-space radar, guided wave radar, or hydrostatic pressure measurement |
|
Measurement Application |
Continuous level, interface measurement, or other model-supported applications |
|
Measuring Range |
Up to 80 m (Micropilot) / Model-dependent probe length or pressure range |
|
Process Medium |
Confirm liquid properties, density, dielectric characteristics, viscosity, solids, and foam |
|
Process Temperature |
-196 C to +450 C (Model and seal-dependent) |
|
Process Pressure |
-1 bar to 400 bar (Confirm against model and process connection limits) |
|
Wetted Materials |
316L Stainless Steel, Alloy C-22, PVDF, PTFE, Monel, Ceramic (Al2O3) |
|
Process Connections |
Flanges (ASME/DIN), Threaded (G/NPT), Sanitary Clamps (Tri-Clamp, Varivent) |
|
Output Signal |
4-20 mA with HART, Modbus RS485, Profibus PA, Foundation Fieldbus, Bluetooth |
|
Hazardous-Area Approval |
ATEX, IECEx, FM, CSA (Intrinsic Safety Ex i & Flameproof Ex d options available) |
Applications
Chemical & Petrochemical Processing: Continuous measurement in storage tanks, process vessels, reactors, and other equipment handling chemical or hydrocarbon media. Selection depends on vapor conditions, tank geometry, medium properties, agitation, and temperature/pressure limits.
Water & Wastewater: Applied to tanks, reservoirs, lift stations, treatment equipment, and basin level monitoring. For open-channel flow, complete measurement arrangements are matched to specific flow formulas.
Food & Life Sciences: Hygienic process connections and specialized wetted materials applied in CIP/SIP-compatible buffer tanks, bioreactors, and high-purity water loops.
Oil & Gas: Liquid level and interface measurement in high-pressure separators, oil storage vessels, and offshore production equipment meeting stringent safety approvals.
Select the Measurement Principle:
- Micropilot: Consider free-space radar when non-contact level measurement is appropriate for the vessel and process conditions.
- Levelflex: Consider guided wave radar when a guided probe is suitable for the vessel and continuous level or supported interface measurement is required.
- Deltapilot: Consider hydrostatic measurement when liquid head pressure provides a suitable basis for level measurement.
Confirm the Process Medium
Provide the actual medium name, density, dielectric characteristics, viscosity, corrosiveness, foam tendency, vapor generation, and suspended solids. Material compatibility must be assessed against actual process conditions.
Check Vessel Geometry
For radar and guided wave radar applications, confirm tank height, diameter, nozzle location, agitators, heating coils, and internal structures.
Define Process Conditions
Verify minimum/maximum operating temperature, pressure, start-up/shutdown conditions, and sensor seal limits.
Select Process Connection and Wetted Materials
Specify flange ratings, thread standards, hygienic connections, and compatible wetted metallurgy.
Confirm Communication and Certification
Define required 4-20mA/HART/Fieldbus protocols, Bluetooth configuration access, hazardous-area approvals, and plant-specific documentation packages.
Supply, Configuration & Quality Documentation
Model and Ordering-Code Verification
Before shipment, the transmitter configuration is cross-checked against approved order specifications and ordering information (including instrument family, model, process connection, and certification requirements).
Configuration Service
Where supported by the selected instrument and agreed supply scope, configuration parameters can be pre-configured according to customer-approved measurement requirements upon request.
Inspection and Documentation
Documentation packages depend on the selected instrument and ordering configuration. Available documents typically include operating instructions, factory calibration records, material certificates, and test reports. Special requirements should be specified during the inquiry stage.
FAQ
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