Siemens 7ML5221-1CA11 SITRANS Probe LU Ultrasonic Level Transmitter 7ML52211CA11

• Extended Product  Type: Level Transmitter
• Product ID: 7ML5221-1CA11
• ABB Type Designation: Pressure Transmitter

Description of Siemens 7ML5221-1CA11 SITRANS Probe LU Ultrasonic Level Transmitter

The Siemens 7ML5221-1CA11 SITRANS Probe LU Ultrasonic Level Transmitter is a compact, high-performance level measurement device designed for continuous, non-contact monitoring of liquids in a wide range of industrial applications. Engineered for reliability and simplicity, this ultrasonic transmitter delivers accurate level readings without direct contact with the process medium, making it ideal for harsh, corrosive, or contaminated environments.

Built with advanced echo processing technology, the SITRANS Probe LU ensures stable and precise measurements even in the presence of vapors, turbulence, or varying tank conditions. Its robust construction and IP-rated enclosure allow it to perform consistently in outdoor and industrial environments.

This model is particularly valued for its ease of installation and commissioning. With minimal configuration required, operators can quickly deploy the device and integrate it into control systems via standard analog outputs. The transmitter supports efficient process control, inventory management, and system optimization across industries.

Key Features of Siemens 7ML5221-1CA11 SITRANS Ultrasonic Level Transmitter

• Non-contact ultrasonic level measurement for liquids
• Reliable performance in harsh and corrosive environments
• Advanced echo processing for accurate readings
• Easy installation and minimal setup requirements
• Compact, durable, and industrial-grade design
• Maintenance-free operation (no moving parts)
• Stable performance in fluctuating temperature and pressure conditions
• Compatible with standard PLC and control systems

Technical Specifications of Siemens 7ML5221-1CA11 SITRANS Ultrasonic Level Transmitter

Parameter	Specification
Product Model	SITRANS Probe LU (7ML5221-1CA11)
Measurement Principle	Ultrasonic (non-contact)
Measuring Range	Up to 12 m (39.4 ft) (depending on conditions)
Output Signal	4–20 mA analog
Accuracy	±0.15% of range
Process Temperature Range	-40°C to +60°C (-40°F to +140°F)
Power Supply	12–30 V DC
Enclosure Rating	IP67 / NEMA 4X
Housing Material	Chemical-resistant plastic
Process Connection	Threaded (typically 2″ NPT)
Communication	Analog output (optional HART depending on variant)
Display	Local LCD display (model dependent)
Mounting Type	Top-mounted tank installation
Frequency	Ultrasonic pulse technology

Applications of Siemens 7ML5221-1CA11 SITRANS Ultrasonic Level Transmitter

The Siemens SITRANS Probe LU ultrasonic level transmitter is widely used across multiple industries due to its versatility and reliability:

• Water and wastewater treatment plants
• Chemical storage tanks
• Industrial process tanks
• Food and beverage liquid storage
• Pump stations and wet wells
• Bulk liquid storage monitoring
• Environmental monitoring systems

Its non-contact design makes it especially suitable for applications involving aggressive chemicals, sludge, or liquids where contamination must be avoided.

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Frequently Asked Questions (FAQ)

1. What is the measuring principle of the SITRANS Probe LU?

It uses ultrasonic waves to measure the distance between the sensor and the liquid surface, providing accurate level readings without direct contact.

2. What industries commonly use this transmitter?

It is widely used in water treatment, chemical processing, food and beverage, and general industrial liquid storage applications.

3. Can it handle harsh environmental conditions?

Yes, the transmitter is designed with a rugged, IP67-rated enclosure, making it suitable for outdoor and industrial environments.

4. Is the device easy to install?

Yes, it features a simple mounting design and requires minimal configuration, reducing installation time and effort.

5. Does it require regular maintenance?

No, since it has no moving parts and uses non-contact measurement, it is virtually maintenance-free.

6. What type of output signal does it provide?

It provides a standard 4–20 mA analog output for easy integration with PLCs and control systems.