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Siemens SITRANS Probe LU Ultrasonic Level Transmitter

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ManufacturerSiemens

Part number7ML5221-1DA11

Range 12m (40 ft)

Output 4-20mA, HART

Transducer Material PVDF Copolymer

Process Connection 2" NPT

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Non-contact ultrasonic measurement Up to 12m (40 ft) range 4-20mA HART output PVDF transducer material 2" NPT process connection Optional PROFIBUS PA

Product description

The Siemens SITRANS Probe LU Ultrasonic level transmitter (7ML5221-1DA11) provides continuous, non-contact level monitoring for liquids and slurries up to a range of 12 meters (40 ft). This transmitter features a PVDF copolymer transducer and a 2" NPT process connection. Standard output is 4-20mA with HART communication, and it is available with optional PROFIBUS PA. The enclosure is made of plastic (PBT) with 2 x M20 cable entries. Approvals include Ordinary Locations/General Purpose, FM, CCSAUS, CE, UKCA, RCM, and KC.

This level transmitter is suitable for a wide range of applications in industries such as water and wastewater, chemical processing, food and beverage, and oil and gas, where reliable measurement of liquid levels is essential. Its non-contact technology ensures it is not affected by material properties like density or corrosiveness.

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Technical specifications

Range	12m (40 ft)
Output	4-20mA, HART
Transducer Material	PVDF Copolymer
Process Connection	2" NPT
Enclosure	Plastic (PBT)
Approvals	Ordinary Locations/General Purpose, FM, CCSAUS, CE, UKCA, RCM, KC
Communication	Optional PROFIBUS PA

Common applications

Water & Wastewater

Chemical Processing

Food & Beverage

Oil & Gas

Tank Level Monitoring

Slurry Level Measurement

Compatible systems

Systems supporting 4-20mA HART or PROFIBUS PA communication

Also known as

SITRANS Probe LU Ultrasonic Level Transmitter

Replaces / compatible with

This product is in phase-out. Consider replacing with: SITRANS Probe LU240 7ML51. It is compatible with systems requiring 4-20mA HART or PROFIBUS PA communication for level sensing.

Technical note

Expert tip

Ensure the transducer is mounted at a sufficient distance from the tank walls and any potential obstructions to avoid false echoes and ensure accurate readings.

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Frequently asked questions

What is the maximum measurement range for the Siemens SITRANS Probe LU (7ML5221-1DA11)?

The Siemens SITRANS Probe LU (7ML5221-1DA11) has a maximum measurement range of 12 meters (40 feet) for continuous, non-contact level monitoring of liquids and slurries.