Wireless Magnetostrictive Liquid Level Transmitter for High-Precision Remote Monitoring

For tank inventory, custody transfer and process control, level measurement must be both extremely precise and continuously available. The QWY-311 wireless magnetostrictive liquid level transmitter delivers the millimeter-class precision of magnetostrictive technology, then sends the data wirelessly to your control room, so precision is never sacrificed for connectivity.

Why Do You Need a Magnetostrictive Level Transmitter with Wireless Output?

Standard level sensors trade precision for simplicity: hydrostatic sensors drift with density changes, ultrasonic sensors are disturbed by foam and vapors, and mechanical float gauges wear out. For applications where every millimeter matters, such as storage tank inventory, blending and custody transfer, operators need a technology that measures position with true precision and repeatability, without moving parts that wear. At the same time, tanks are often spread across large sites or remote locations where pulling cables is expensive. A magnetostrictive transmitter with wireless output answers both requirements: it measures the level with exceptional precision at the tank, and delivers the value to the control room without a single meter of signal cable.

Working Principle: Time-of-Flight on a Magnetostrictive Waveguide

The QWY-311 uses the magnetostrictive principle, one of the most precise level measurement technologies available. A float containing a permanent magnet rides on a vertical waveguide tube inside the tank, and the electronics send a short current pulse down the waveguide. The magnetic field of the float interacts with the pulse to create a torsional strain wave, which travels back along the waveguide at a known speed. By measuring the time between the launch of the pulse and the arrival of the return wave, the electronics calculate the float position, and therefore the liquid level, with high precision. The measured value is shown and transmitted wirelessly for remote monitoring, with the sensor electronics sealed in an IP67 housing and powered by less than 0.5 W at 24 V DC.

Structural Advantages of the QWY-311

• Magnetostrictive precision: high-resolution, repeatable level measurement with no mechanical wear.
• Wireless remote monitoring: level data delivered without cable installation.
• No moving contact parts: the float never touches the sensing element, so nothing wears out.
• IP67 protection: sealed electronics for outdoor and washdown environments.
• Temperature-compensated -10 to +60 °C: stable readings across seasons.
• 304 stainless wetted parts and 316L diaphragm: corrosion resistance for industrial media.
• Multiple electrical options: M20×1.5, M12 and DIN43650 junction box.
• Low power consumption below 0.5 W: suitable for solar and battery sites.

Pain Point Analysis: 4 Challenging Working Conditions

Application Cases

Product Advantages

• Magnetostrictive technology for high-precision level measurement
• Wireless remote monitoring without cable installation
• Non-contact float design with zero mechanical wear
• IP67 sealed electronics for harsh environments
• Temperature compensation from -10 to +60 °C
• 304 stainless wetted parts with 316L diaphragm
• M20×1.5, M12 and DIN43650 connection options
• Low power consumption below 0.5 W at 24 V DC
• High repeatability for inventory and batch control
• OEM/ODM customization and manufacturer support

Technical Parameters

SEO FAQ

Q1: What is a magnetostrictive level transmitter?

A magnetostrictive level transmitter measures liquid level using the magnetostrictive principle: a float with a permanent magnet moves along a vertical waveguide tube, and the electronics send a current pulse down the waveguide. The pulse interacts with the float's magnetic field to generate a torsional strain wave that travels back along the tube, and the level is calculated from the time-of-flight of that wave. Because the speed of the wave is precisely known and the measurement is time-based rather than analog, magnetostrictive transmitters achieve very high resolution and repeatability. The QWY-311 applies this technology with wireless output, combining laboratory-grade precision with modern remote monitoring.

Q2: How accurate is magnetostrictive level measurement?

Magnetostrictive technology is among the most accurate level measurement methods available, offering resolution and repeatability far superior to hydrostatic, ultrasonic or capacitive methods in many applications. Because the measurement is based on the precise timing of a strain wave rather than on an analog signal level, it is inherently repeatable and free from the drift that affects analog sensors. This makes it the technology of choice for storage tank inventory, custody transfer, blending and other applications where small level differences represent significant quantities. The QWY-311 brings this precision to both local indication and wireless remote monitoring.

Q3: Why is wireless output valuable for tank level monitoring?

Wireless output eliminates the signal cable between the tank and the control room, which is often the most expensive and difficult part of a level instrumentation project. Cables must be trenched, supported, protected from damage and lightning, and routed around obstacles such as roads and waterways. Wireless transmission removes all of that, allowing tanks in remote areas, tank farms and distributed sites to report level data to a central system at a fraction of the installation cost. It also makes retrofitting existing tanks practical, because no new cable infrastructure is required. The QWY-311 combines this connectivity with high-precision measurement.

Q4: What maintenance does a magnetostrictive transmitter need?

Magnetostrictive transmitters are essentially maintenance-free because the float never contacts the sensing element, so there are no moving parts to wear, no linkages to lubricate and no mechanical hysteresis to develop. The main maintenance tasks are periodic verification of the reading against a reference, cleaning the float and waveguide if the medium is fouling, and checking the electrical and wireless connections. Because the technology is time-based, it does not drift like analog sensors, so calibration intervals can be extended. This low maintenance burden is one of the key reasons operators choose magnetostrictive technology for long-life installations.

Q5: Can the transmitter measure interface levels or density?

Magnetostrictive transmitters can be configured with multiple floats on the same waveguide, allowing measurement of liquid level and liquid-liquid interface level simultaneously, for example oil-water interfaces in separators. Because each float generates its own return wave, the electronics can distinguish multiple positions along the waveguide. This capability is valuable in applications such as oil/water separation, where knowing both the total level and the interface position is important. If your application requires interface measurement or density-related calculations, please discuss the configuration with our engineers to determine the correct float arrangement.

Q6: What is the operating temperature range?

The QWY-311 is temperature-compensated for operation from -10 °C to +60 °C, covering outdoor tank farms, unheated storage areas and warm process environments. The compensation ensures that the measured level remains stable and accurate as the ambient temperature changes, which is important for outdoor installations where seasonal temperature swings are significant. The wetted materials, including 304 stainless steel and the 316L diaphragm, are selected for compatibility with the measured media across this temperature range. For media or environments outside this range, please consult our engineers for suitable configuration options.

Q7: How is the transmitter installed on a tank?

The QWY-311 is typically top-mounted: the waveguide tube is inserted through a nozzle on the tank top, with the float assembled onto the tube before installation, and the transmitter head secured above the nozzle. A stilling well or guide tube is recommended in turbulent tanks to keep the float movement stable and protect the waveguide from liquid movement. The float must be selected for the liquid density so that it floats correctly at the surface. The transmitter head remains accessible above the tank for reading, maintenance and wireless antenna placement, which is a practical advantage of top-mounted magnetostrictive instruments.

Q8: Can the sensor survive outdoor weather conditions?

Yes. The QWY-311 electronics are housed in an IP67-rated enclosure, which is completely protected against dust and withstands temporary immersion in water, providing reliable operation in rain, snow, humidity and washdown conditions. The wetted components are made of corrosion-resistant stainless steel, and the cable and connector options, including M20×1.5, M12 and DIN43650, can be specified with appropriate sealing for outdoor service. Combined with the -10 to +60 °C temperature compensation, the transmitter is well suited to exposed tank farm and reservoir installations in a wide range of climates.

Q9: What power is required and can it run on solar?

The QWY-311 consumes less than 0.5 W at 24 V DC, which is low enough for solar-powered and battery-powered installations. A small solar panel with a charge controller and battery can power the transmitter continuously at remote sites, and the low consumption keeps the battery small and the maintenance interval long. The wireless output also operates within this economical power budget, so the entire monitoring point, sensor plus telemetry, can be self-powered. For remote reservoirs, tank farms and environmental monitoring sites without mains power, this makes the QWY-311 a practical and cost-effective solution.

Q10: What support and customization do you offer?

We manufacture the QWY-311 and provide direct engineering support for installation planning, float selection, wireless link design and troubleshooting. OEM and ODM services are available, including custom waveguide lengths, custom float materials, wireless configuration, labeling and packaging, with a monthly supply capacity of 100 pieces and delivery within 5-8 working days. Each unit is factory-calibrated and tested before shipment. Contact us with your tank dimensions, liquid properties and monitoring requirements, and we will specify the correct configuration with a quotation.

Why Choose Our Wireless Magnetostrictive Level Transmitter?

The QWY-311 unites the two things modern tank management demands: the precision of magnetostrictive measurement for accurate inventory and control, and wireless connectivity for economical remote monitoring. With non-contact, wear-free operation, IP67 protection and solar-friendly low power, it is built for years of dependable service in the field. As the manufacturer, you receive factory calibration, application engineering and fast delivery. When every millimeter of level and every meter of avoided cabling matters, choose the QWY-311.