Overview
The Siemens SITRANS LR150 (Model 7ML5340-0AA07-4CF3) is a versatile 2-wire, 24 GHz radar level transmitter engineered for continuous, non-contact measurement of liquids, slurries, and solids—with a maximum range of 15 meters. As part of Siemens’ process instrumentation portfolio, this compact, robust device excels in reliability-critical environments, leveraging Frequency Modulated Continuous Wave (FMCW) radar technology to deliver highly accurate, stable measurements even amid dust, steam, or fluctuating process conditions.
Core Technology: FMCW Radar Principle Explained
Unlike older contact-based or ultrasonic technologies, the SITRANS LR150 relies on advanced radar technology. It transmits a continuous, 24 GHz high-frequency radio signal whose frequency changes steadily over time (frequency modulation). This signal travels to the material surface, reflects back to the transmitter’s antenna, and the instrument then compares the frequency of the returning echo with the frequency being transmitted at that exact moment.
The difference between these two frequencies is directly proportional to the distance to the material level. This FMCW principle delivers an excellent signal-to-noise ratio, ensuring superior measurement stability and accuracy—even for low-reflectivity materials or vessels with internal obstructions (e.g., agitators).
Product Design and Key Features
The SITRANS LR150 is engineered for industrial durability and user-friendliness, with design highlights including:
Compact, Versatile Form Factor: Its small size and lightweight construction simplify installation in tight spaces—such as existing tank nozzles or crowded tank farms—without compromising performance.
Two-Wire Loop Power: Operates on a standard 4-20 mA two-wire loop, using the same pair of wires for both power and communication. This cuts installation costs and streamlines integration into existing control systems.
Integrated Display & User Interface: A built-in local display (LDI) and intuitive pushbuttons enable on-site configuration, commissioning, and diagnostics—no additional tools required, reducing setup time.
Rugged Construction: Features a durable enclosure with high Ingress Protection (IP) ratings, ensuring resilience in harsh outdoor or industrial environments (e.g., extreme temperatures, moisture, or vibration).
Technical Specifications
The SITRANS LR150’s key technical parameters underscore its precision and adaptability:
Product Name: Siemens SITRANS LR150 Radar Level Transmitter
Model Number: 7ML5340-0AA07-4CF3
Core Technology: 24 GHz Frequency Modulated Continuous Wave (FMCW) Radar
Measurement Range: Up to 15 meters (49.2 feet)
Measured Media: Liquids, slurries, and bulk solids
Process Connection: Multiple thread or flange options (varies by specific model, tailored to application needs)
Power Supply: Two-wire, 4-20 mA HART® (loop-powered)
Signal Output: 4-20 mA HART® (for seamless data transmission to control systems)
Accuracy: Typically ±3 mm (ensuring high precision for critical process control)
Primary Applications and Use Cases
The SITRANS LR150’s versatility makes it a staple across diverse industries, addressing unique measurement challenges:
Water and Wastewater: Reliable level monitoring in clarifiers, storage tanks, and sumps—unaffected by changing water quality, bubbles, or suspended solids that disrupt other technologies.
Chemical and Petrochemical: Safely monitors aggressive liquids and corrosive slurries in storage/process tanks. Its non-contact design eliminates risks of probe corrosion or material buildup.
Bulk Solids Handling: Measures levels of powders, grains, and granules in silos—even in dusty filling conditions that blind ultrasonic sensors. The FMCW radar cuts through dust for consistent readings.
Food and Beverage: Supports hygienic level monitoring in ingredient storage tanks and finished product vessels, with material options that meet industry sanitation standards.
Advantages Summary
The SITRANS LR150 stands out for its ability to solve common level-measurement pain points:
Non-Contact Operation: Eliminates issues with material buildup, probe corrosion, or mechanical wear—extending service life and reducing maintenance.
Resilience to Process Chaos: Performs reliably despite dust, steam, light foam, or fluctuations in temperature/pressure—no need for frequent recalibration.
Simplified Installation & Setup: Easy mounting and a guided “quick start” wizard (via the integrated interface) reduce commissioning time, even for non-specialist users.
Low Lifecycle Costs: No moving parts and a rugged design mean minimal maintenance over years of operation, lowering total ownership costs.
Frequently Asked Questions (FAQs)
1.How does radar level measurement differ from ultrasonic?
Radar uses high-frequency electromagnetic waves; ultrasonic uses sound waves. Radar is unaffected by changes in temperature, pressure, or vapor-space composition (which distort sound speed, causing ultrasonic errors). It’s more reliable in harsh industrial conditions.
2. Is the SITRANS LR150 suitable for solids like plastic pellets?
Yes—its 24 GHz frequency and FMCW technology deliver focused signals and strong reflections from solid surfaces, even low-dielectric materials like pellets. Very light, fine powders may need evaluation, but it works excellently for most granules.
3. What does “two-wire” technology mean for installation?
Two-wire operation uses the same pair of wires for power and data (4-20 mA HART® signal). This eliminates separate power cables, cutting installation time and costs while simplifying integration into existing loops.
4. Can it handle aggressive chemicals?
Yes—chemical resistance depends on the process connection and antenna material. Siemens offers options like PVDF or PTFE-coated antennas, which resist a wide range of aggressive chemicals and slurries.
5. How is the device calibrated/configured?
Configure via the integrated display/pushbuttons or a HART communicator. A “quick start” wizard guides basic setup, and advanced echo-processing software often works effectively without complex on-site calibration.
6. What’s the advantage of 24 GHz frequency?
24 GHz enables a smaller antenna (for compact design) and a narrower beam angle. The narrow beam avoids false echoes from vessel walls, agitators, or internal obstructions—boosting measurement accuracy.
FAQ
1.Who are We?
Beijing Zhongping Technology Co., LTD., is a one-stop integrated service provider of intelligent manufacturing, belongs to the Gong Doctor Group, is a scientific research, design, marketing, technical services, industrial Internet, international import and export services as one of the science and technology companies.
2.What can you buy from us?
PLC, inverter, human-machine interface, hydraulic products, low-voltage power distribution, industrial robots and core components
3.Is the item in stock or need to be purchased from another supplier?
We have a large inventory of goods and have our own warehouse.
4.What advantages do we have over other suppliers?
Our company has a large amount of inventory and a number of warehouses, but also in the country's important industrial provinces and cities with offices and a number of overseas service points. To provide you with intelligent manufacturing one-stop comprehensive services, save efforts, labor and cost.
5.Can you provide 100% new original authentic products?
We only sell new original genuine, no renovation, no fake, only for the original factory original!
6.How long is the delivery time?
If there is a stock, it will take 2-3 working days to ship, if the quantity is large, it will take 5-7 working days after receiving the payment, if it is not a conventional model, it will take some time, we will inform you of the specific delivery time.
7.Is there technical support available?
Of course, we have a professional technical team that can help you solve technical problems.
8.How do we guarantee quality?
We have three processes to control the quality of goods.
1). Our engineers will inspect the production and quality control in the factory regularly.
2) Incoming materials shall be inspected by experienced purchasing engineers before they can be stored.
3). At least 2 people in the logistics department cross-check the goods to be sent before delivery.
9.Can you guarantee the safe and reliable delivery of your products?
Yes, we strictly adopt the international standard packing. We also use special packaging for dangerous goods, and refrigerated shipping for items with temperature requirements. Special item packaging and general cargo standard packaging requirements may incur additional costs.
10.How about the freight?
The cost depends on how you choose to get the goods. Express is usually the fastest but also the most expensive way. Sea freight is the best solution for large quantities of goods. The exact shipping cost depends on the purchase amount、quantity and weight of your order. Please feel free to contact us for more information.
010-64225983
+8613811814778
info@zhongpingtech.com
Building 26, Liyuan Community, Chaoyang District, Beijing, China
