- Continuous level measurement up to 120 m (393 ft)
- Easy installation and commissioning
- Programming via 4-button HMI, mobile IQ App with Bluetooth, or SIMATIC PDM.
- IQ Guard for condition monitoring, NE 107 diagnostic messages, and quality verification report
- HART 7 communication
- Graphical HMI with echo profile display and backlighting
- Near-field blanking for automatic detection and suppression of noise caused by material build-up
- Process Intelligence signal processing
- 1 mm measurement accuracy in accordance with IEC 62828
- Suitable for API 2350
- Automatic false-echo suppression to reduce echoes from fixed internals
- Low power consumption with EPD (Environmental Product Declaration)
- Optional SLOD (Second Line of Defense) for additional safety when handling toxic substances
- 100,000 data logging points for analysis and optimization of process control
 Datasheet |
- Continuous level measurement up to 120 m (393 ft)
- Easy installation and commissioning
- Programming via 4-button HMI, mobile IQ App with Bluetooth, or SIMATIC PDM.
- IQ Guard for condition monitoring, NE 107 diagnostic messages, and quality verification report
- Communication with HART 7
- Graphical HMI with echo profile display and backlighting
- Near-field blanking for automatic detection and suppression of noise caused by material build-up
- Process Intelligence signal processing
- 1 mm measurement accuracy in accordance with IEC 62828
- Suitable for API 2350
- Automatic false-echo suppression to reduce echoes from fixed internals
- Low power consumption with EPD (Environmental Product Declaration)
- Optional SLOD (Second Line of Defense) for additional safety when handling toxic substances
- 100,000 data logging points for analysis and optimization of process control
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Datasheet
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- Continuous level measurement up to 120 m (393 ft)
- Easy installation and commissioning
- Programming via 4-button HMI, mobile IQ App with Bluetooth, or SIMATIC PDM.
- IQ Guard for condition monitoring, NE 107 diagnostic messages, and quality verification report
- Communication with HART 7
- Graphical HMI with echo profile display and backlighting
- Near-field blanking for automatic detection and suppression of noise caused by material build-up
- Process Intelligence signal processing
- 1 mm measurement accuracy in accordance with IEC 62828
- Suitable for API 2350
- Automatic false-echo suppression to reduce echoes from fixed internals
- Low power consumption with EPD (Environmental Product Declaration)
- Optional SLOD (Second Line of Defense) for additional safety when handling toxic substances
- 100,000 data logging points for analysis and optimization of process control
| Datasheet |
- Continuous level measurement up to 120 m (393 ft)
- Easy installation and commissioning
- Programming via 4-button HMI, mobile IQ App with Bluetooth, or SIMATIC PDM.
- IQ Guard for condition monitoring, NE 107 diagnostic messages, and quality verification report
- Communication with HART 7
- Graphical HMI with echo profile display and backlighting
- Near-field blanking for automatic detection and suppression of noise caused by material build-up
- Process Intelligence signal processing
- 1 mm measurement accuracy in accordance with IEC 62828
- Suitable for API 2350
- Automatic false-echo suppression to reduce echoes from fixed internals
- Low power consumption with EPD (Environmental Product Declaration)
- Optional SLOD (Second Line of Defense) for additional safety when handling toxic substances
- 100,000 data logging points for analysis and optimization of process control
| Datasheet |
SITRANS LU150 is a short-range integrated ultrasonic level transmitter ideal for liquids and slurries in your open or closed vessels.
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SITRANS Probe LU is a 2-wire loop-powered ultrasonic level measurement transmitter for measuring storage vessels, filter beds, and open channel flow in the water and wastewater, food, and chemical industries.
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SITRANS Probe LU240 ultrasonic level transmitter is a cost-effective, compact, intelligent level solution for liquid chemical inventory, monitoring small process vessels, and level measurement in the environmental industry.
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The Probe is a short-range integrated ultrasonic level transmitter, ideal for liquids and slurries in open or closed vessels. The transducer is available in PVDF copolymer, making the device suitable for use in a wide variety of applications.
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Echomax XRS-5 ultrasonic transducer provides reliable, continuous level monitoring of liquids and slurries in narrow lift stations/ wet wells, flumes, weirs and filter beds. The low-cost XRS-5 transducer is compatible with a full range of Siemens controllers, from a basic system for high/low alarm or simple pump control, up to advanced control systems with communications, telemetry and SCADA integration capabilities.
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Echomax XPS transducers use ultrasonic technology to measure level in a wide range of liquids and solids. The transducers can be fully immersed, are resistant to steam and corrosive chemicals, and can be installed without flanges.
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SITRANS Probe LR is a 2-wire, 6 GHz pulse radar level transmitter for continuous monitoring of liquids and slurries in basic storage vessels with nominal pressure and temperature, to a range of 20 m (66 ft).
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SITRANS LR100 series are 80 GHz compact radar transmitters with Bluetooth wireless technology. For level measurement of liquids or solids. Featuring a narrow beam for flexible installations in existing vessel openings – or non-intrusively through plastic vessels.
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SITRANS LR200 is a 2-wire, 6 GHz pulse radar level transmitter for extreme process conditions in process vessels up to 20 meters (66 ft). This technology is most suited for applications where there is severe turbulence or material buildup.
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SITRANS LR250’s complete range of antennas and process connections makes this transmitter suitable for nearly any liquids application. Built to last, these antennas give you liquid level flexibility for inventory and process vessels.
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SITRANS LR460 is for challenging solids applications. For extremely low dielectric, low density powders, the 25 GHz SITRANS LR460 is the preferred solution. Featuring a horn antenna with an 8-degree beam, this 4-wire FMCW device has proven itself in thousands of applications.
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SITRANS LR560 is the first choice and easiest-to-use solids radar transmitter on the market. With a high frequency of W band (78 GHz), 4-degree narrow beam, and short wavelength, it performs reliably on solids material from practically any installation location.
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The SITRANS LG series are guided wave radar transmitters for continuous level, level and interface, and volume measurement of liquids and solids. They are unaffected by changes in process conditions, high temperatures and pressures, and steam.
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SITRANS LC300 is an inverse frequency shift capacitance continuous level transmitter for liquids and solids or liquid interface applications. Materials with low or high dielectric properties are accurately measured and Active-Shield technology helps in ignoring the effects of buildup near vessel nozzle.
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SITRANS LT500 is the next evolution of level, flow, and pump controllers for radar transmitters – or any 2-wire 4-20 mA device. It is the first choice for radar sensor measurements at 80 GHz and features single and dual point measurements, 6 relays, and Modbus RTU, HART, PROFIBUS DP, PROFIBUS PA, PROFINET.
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SITRANS LUT400 are compact, single point, long range ultrasonic controllers for continuous level or volume measurement of liquids, slurries, and solids, and high accuracy monitoring of open channel flow.
- SITRANS LUT420 Level Controller: level or volume measurement of liquids, slurries, and solids, as well as basic pump control functions, and basic data logging capability.
- SITRANS LUT430 Level, Volume, Pump and Flow Controller: includes all features of the LUT420 plus a full suite of advanced pump control and alarm functionality, open channel flow monitoring, and basic flow data logging capability.
- SITRANS LUT440 High Accuracy OCM: Our most featured, highest accuracy model. Includes all features of the LUT430, plus the industry’s best accuracy (± 1 mm within 3 m), full suite of advanced control functionality, and enhanced flow logging capability.
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MultiRanger/HydroRanger is a versatile short- to medium-range ultrasonic single- and multi-vessel level monitor/controller for virtually any application in a wide range of industries. MultiRanger/HydroRanger can be used on different materials, including fuel oil, municipal waste, acids, woodchips or on materials with high angles of repose.
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MultiRanger/HydroRanger 200 HMI is a versatile short- to medium-range ultrasonic single- and multi-vessel level monitor/controller for virtually any application in a wide range of industries.
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Continuous Level Measurement – precise level & volume readings for tanks, silos & pits
Continuous level sensors output a real-time value for level, volume or mass in liquids, pastes and bulk solids. Depending on the process, choose radar/FMCW (80/120 GHz), guided wave radar (TDR), ultrasonic, hydrostatic transmitters (submersible/screw-in), magnetostrictive rod sensors, differential pressure (with/without diaphragm seals) or mechanical float/rope potentiometers.
Features (model-dependent): high accuracy (down to mm), hygienic design (EHEDG/FDA), ATEX/IECEx, SIL, high T/p capability, volume linearization (strapping table), density/temperature compensation and communications (4–20 mA/HART, Modbus/RS-485, Profibus/Profinet, EtherNet/IP, IO-Link).
ICS Schneider Messtechnik supports technology selection, sizing (geometry, dead/blank zones), materials, calibration and integration into PLC/SCADA/IIoT.
FAQ on Continuous Level Measurement
Answers on measuring principles, selection, accuracy, installation, setup, hygiene/ATEX/SIL, linearization and troubleshooting.
Which measuring principle fits my application?
| Principle | Media | Strengths | Notes |
|---|---|---|---|
| Radar/FMCW (80/120 GHz) | Liquids & bulk solids | Very precise, foam/steam tolerant | Mind antenna/aiming and near range |
| Guided wave radar (TDR) | Liquids, interfaces | Insensitive to internals, interface capable | Probe length = measuring range |
| Ultrasonic | Water/wastewater, bulk | Non-contact, economical | Sensitive to steam/turbulence |
| Hydrostatic | Liquids | Robust, very deep ranges | Compensate density/temperature |
| Magnetostrictive | Oils/chemicals | mm accuracy, multi-float/interface | Requires float(s) |
| Differential pressure (DP) | Process vessels | Proven, also with seals | Watch density/static & impulse lines |
How do 24/80/120 GHz radar options differ?
Higher frequency ⇒ narrower beam, better focusing around internals/bulk cones, often smaller antennas. 24 GHz is tolerant to build-up; 80/120 GHz excel in tall silos and small nozzles.
When is TDR better than free-space radar?
In narrow vessels, with heavy internals/agitators or low dielectric constants. TDR also shines for interface (e.g., oil/water) measurement.
What accuracy is realistic?
| Technology | Typical accuracy | Comment |
|---|---|---|
| Radar/TDR | ±2…10 mm | Installation & setup are key |
| Ultrasonic | ±0.25…0.5 % FS | Environment dependent |
| Hydrostatic | ±0.1…0.25 % FS | Compensate density/temperature |
| Magnetostrictive | ±1…2 mm | Excellent repeatability |
| DP (with seals) | ±0.075…0.2 % FS | Keep impulse lines clean/vented |
How do I handle dead/blanking zones?
Mount so the sensor’s zero reference sits above the blanking zone (observe radar near range). Extend TDR probes close to the bottom with a safety offset.
How do I choose antenna/probe/horn size?
By temperature/pressure, medium, space and fouling: PTFE/PP domes, horn or still-pipe antennas; TDR rod/cable probes; ultrasonic with suitable transducer diameters.
What about foam, steam and condensation?
Radar/TDR are tolerant; for heavy condensation add purge/heating. Ultrasonic needs a dry, free sound path—use a guide tube if required.
How do I implement volume calculation/strapping?
Many transmitters offer strapping tables (e.g., horizontal cylinders, special geometries) to compute level → volume/mass with temperature compensation.
How does density affect hydrostatic/DP readings?
Measured value ∝ density. With variable density enable compensation (ρ(T), concentration) or use radar-based measurement.
What’s special about bulk solids?
80/120 GHz radar with tight beam suits deep silos; consider the fill cone, aim into a calm zone, enable dust compensation.
Where should I mount the sensor?
Away from inlets/splash, agitators and walls. Slightly tilt radar toward the surface. TDR works well in a stilling well/bypass.
Which outputs/communications are available?
4–20 mA/HART, relay/PNP/NPN, pulse, Modbus/RS-485, Profibus/Profinet, EtherNet/IP, IO-Link. Diagnostics include echo curves, signal quality and alarms.
How are setup & commissioning done?
Via keys/display, DTM/EDD/software or IO-Link. Set zero/span, damping, false-echo suppression, empty-pipe/stilling-well calibration and load strapping tables.
What matters in hygienic applications?
316L, flush antennas/probes, clamp/Varivent, FDA/EU 1935 seals, CIP/SIP resistance, polished surfaces; provide conformity/material certificates.
Are ATEX/IECEx & SIL options available?
Many devices are offered in Ex i/Ex d with SIL2/3. In hazardous areas use proper isolators/barriers, grounding and observe proof-test intervals.
How do I stabilize noisy signals?
Use damping (time constant), a stilling well/bypass, averaging and correct aiming. For DP, vent impulse lines and use condensate pots.
What are typical pitfalls?
- Too little free sight/straight run → change position/aim
- Wrong antenna type → recheck medium/T/pressure
- Uncompensated density changes → enable compensation
- Condensation/build-up → add purge/heating, pick suitable materials
- Wrong TDR probe length → match to measuring span
How often should I calibrate/verify?
Typically annually depending on QA criticality. Radar/TDR often need no reference; hydrostatic/DP should be checked after oil change/density shifts or service events.
Can I issue limit alarms as well?
Yes—many continuous devices provide additional switch outputs (min/max, window) or internal diagnostic alarms (foam, signal loss).
Do you support selection & integration?
Yes. We choose the best principle, size the probe/antenna, configure linearization & alarms, supply calibration certificates and integrate into PLC/SCADA/cloud.