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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- 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
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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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Continuous Level Measurement
Continuous level measurement devices provide a constant, real-time indication of the fill level in tanks, silos or process vessels, using appropriate sensors. Unlike simple level switches, they do not only indicate whether a limit is reached — they continuously monitor and output the actual level or volume, regardless of whether the medium is liquid, bulk solid, granulate or powder. This makes them ideal for processes with varying fill levels, automated filling/emptying, process control or ongoing monitoring.
Questions & Answers about Continuous Level Measurement
What does “continuous level measurement” mean?
Continuous level measurement continuously provides a value for the current fill level or volume within a vessel — not just a binary indication when a threshold is crossed.
Which measurement principles are commonly used?
Common techniques include radar or microwave sensors, ultrasonic sensors, hydrostatic pressure probes, and capacitive sensors. The choice depends on the medium, vessel type, installation and environmental conditions.
What media can be measured with continuous level sensors?
Depending on sensor type, liquids, bulk solids, powders, granulates or other solids can be measured — provided the sensor is compatible with the material’s properties.
What are the advantages of continuous measurement compared to level switches?
It enables continuous, precise knowledge of fill level or volume — useful for process control, automated filling, mixing processes, or continuous production. It also helps to prevent overfilling or dry-run by continuous monitoring.
Which outputs and interfaces do modern level sensors support?
Typical outputs include analog (e.g. 4–20 mA), digital fieldbus interfaces (e.g. HART, Profibus, Modbus), relay/contact outputs, or IO-Link — facilitating easy integration into PLCs or control systems.
How much maintenance is required?
Maintenance is generally low. Non-contact sensors like radar or ultrasound require little upkeep. Sensors in direct contact with the medium may need occasional cleaning or functional checking depending on medium properties.
How precise is the level measurement?
Depending on sensor and medium, point-accurate measurements are possible for liquids and bulk solids. Accuracy depends on installation, medium homogeneity and calibration.
Is continuous measurement possible for combustible or dusty media?
Yes — with suitable sensors (e.g. radar or explosion-proof variants) continuous level detection also works in dusty, explosive or hazardous environments.
Are there limitations for foaming or vapor-laden media?
Yes — ultrasound or radar sensors may be affected by foam, vapor or gas layers above the medium. In such cases, a carefully selected sensor type and configuration is required.
For which applications is continuous level measurement particularly suitable?
Typical applications include storage tanks for liquids or bulk materials, silos in chemical or food industry, process vessels in manufacturing, wastewater systems, water treatment, and automated filling/emptying systems.
What happens when the sensor fails?
In case of sensor failure it is advisable to configure alarms or default fallback levels to ensure safety — for example to prevent overfill or protect downstream processes.
Can continuous measurement and limit switches be combined?
Yes — often continuous level sensors are used together with limit-level switches to provide precise level data and reliable overfill or dry-run protection simultaneously.