Corrosion-Resistant Wireless Submersible Liquid Level Sensor for Remote Monitoring

Some level measurement points are simply out of reach: deep wells, distant reservoirs, chemical tanks where running cables is impractical or unsafe. The QWY-312 combines corrosion-resistant 316L construction, wireless data transmission and a local LCD display, giving operators accurate level data from difficult locations without the cost and risk of long cable runs.

Why Do You Need a Wireless, Corrosion-Resistant Level Sensor?

Traditional level monitoring requires pulling signal cables from the tank or well to the control room, which is expensive, vulnerable to lightning and mechanical damage, and sometimes impossible across roads, waterways or leased land. At the same time, many monitored liquids are aggressive: salt water, chemical solutions and industrial wastewater attack ordinary sensors within months. Operators need a sensor that solves both problems at once. Wireless transmission eliminates the cable cost and installation risk, while corrosion-resistant 316L construction ensures the probe survives the medium. Add a local LCD display and the same instrument serves the field technician who wants an immediate reading and the control room that wants continuous remote data.

Working Principle: Wireless Telemetry with Local Display

The QWY-312 measures liquid level through the hydrostatic pressure principle: the 316L sensing diaphragm at the probe experiences pressure proportional to the liquid height, and the electronics convert it into a measurement with ±0.1%FS accuracy. The value is shown on the integral LCD digital display for on-site reading and simultaneously delivered through a 4-20 mA output and wireless transmission for remote monitoring. The sensor operates on a 24 V DC supply with less than 0.5 W consumption, so it can be powered by the existing loop supply or a small solar-charged battery at remote sites, transmitting level data to a central station without any cable between the measurement point and the control room.

Structural Advantages of the QWY-312

• Wireless transmission: level data reaches the control room without cable runs.
• Corrosion-resistant 316L construction: survives salt water, chemicals and wastewater.
• LCD digital display: instant on-site reading for field technicians.
• ±0.1%FS accuracy: precise level measurement for control and inventory.
• 4-20 mA output plus wireless: flexible integration with existing systems.
• Low power consumption under 0.5 W: ideal for solar and battery sites.
• Range to 0-1000 psi: deep tanks, wells and high-pressure duty.
• Integrated pressure switch: local alarm capability without extra hardware.

Pain Point Analysis: 4 Challenging Working Conditions

Application Cases

Product Advantages

• Wireless transmission eliminates cable runs and their cost
• Corrosion-resistant 316L stainless steel construction
• ±0.1%FS high accuracy measurement
• Integral LCD digital display for on-site reading
• Dual output: wireless plus 4-20 mA
• Low power consumption under 0.5 W
• Range options up to 0-1000 psi
• Integrated pressure switch for local alarms
• 24 V DC supply, solar/battery compatible
• OEM/ODM customization and manufacturer support

Technical Parameters

SEO FAQ

Q1: How does the wireless transmission work?

The QWY-312 transmits the measured level data wirelessly to a receiver or gateway at the control location, eliminating the need for signal cables between the measurement point and the monitoring system. The sensor also retains a standard 4-20 mA output, so it can feed a local RTU or PLC where one exists. Wireless transmission is especially valuable for remote wells, reservoirs, tank farms and lift stations where cable routes cross roads, waterways or third-party land, or where trenching costs are prohibitive. The wireless link is designed for reliable industrial telemetry, and our engineers can advise on the range, antenna placement and gateway configuration for your specific site.

Q2: Why is corrosion resistance important for this sensor?

Corrosion is the most common cause of premature failure in submersible level sensors. Salt water, chemical solutions and wastewater attack the housing, diaphragm and seals, causing leaks, drift and eventual failure. The QWY-312 is built with 316L stainless steel wetted parts, which resist corrosion from seawater, many acids and alkalis, and industrial wastewater far better than standard steels or plated materials. This means longer service life, fewer replacements and more reliable data in aggressive media. For the most severe chemical service, please confirm the exact medium composition with our engineers so the material selection can be verified for your application.

Q3: What does the LCD display show?

The integral LCD digital display shows the current level or pressure value in the configured engineering units, such as meters, bar or psi, directly at the sensor. This is a practical feature for field technicians who need to verify the level during installation, maintenance or pump checks without carrying a separate display or communicator. The display also helps troubleshooting: if the control room value differs from the local reading, the problem is clearly in the transmission path rather than the sensor. The display is readable in daylight and is housed in the sealed instrument enclosure for protection against the environment.

Q4: What accuracy can I expect?

The QWY-312 offers an accuracy of ±0.1%FS, meaning the measured value deviates from the true level by no more than 0.1% of the full-scale range. On a 10-meter level range, this corresponds to an error of about 1 cm, which is excellent for tank inventory, pump control and environmental monitoring applications. The accuracy is achieved through a precision sensing element, careful factory calibration and stable electronics, and it applies to both the displayed value and the transmitted signal. For applications with very tight accuracy requirements, the ±0.1%FS performance of the QWY-312 provides a dependable foundation.

Q5: Can the sensor be powered by solar or battery systems?

Yes. The QWY-312 consumes less than 0.5 W at 24 V DC, which makes it very economical for solar-powered and battery-powered installations. A small solar panel and battery can power the sensor continuously, and the low consumption extends battery life between charges, reducing maintenance visits to remote sites. The wireless transmission also consumes little power, keeping the total energy demand of the monitoring point low. This combination makes the QWY-312 an excellent choice for reservoirs, wells and other off-grid measurement points where mains power is unavailable or expensive to install.

Q6: What measuring ranges are available?

The QWY-312 is available with measuring ranges up to 0-1000 psi, covering deep tanks, wells and high-pressure applications. For level measurement, the range is selected to match the actual liquid depth so that the full output span represents the working level range with maximum resolution. For example, a 10-meter tank would use a 0-1 bar range, while a deep well might use a 0-10 bar range. Custom ranges within the maximum are factory-calibrated to your requirements. When ordering, specify your maximum level or pressure so the correct range is configured and the sensor delivers the best possible resolution.

Q7: How is the sensor installed at a remote site?

For wells and reservoirs, suspend the QWY-312 probe at a fixed depth below the lowest expected water level and anchor the cable at the surface with proper strain relief. For tanks, mount through a bottom or side nozzle, or suspend from the top. Position the antenna or wireless module for good signal path to the receiver, avoiding metal enclosures that shield the signal. Connect the 24 V DC supply, observing polarity, and verify the wireless link before finalizing the installation. The user manual provides detailed installation and commissioning instructions, and our engineers can support site-specific planning.

Q8: Can the sensor be used in hazardous areas?

The QWY-312 is designed for general industrial and remote monitoring applications. If your installation is in a classified hazardous area where flammable gases or dusts are present, the instrument must be approved for that area classification, and the standard version may not be suitable. In such cases, please inform us of your area classification and we will advise whether a different instrument from our range, such as our explosion-proof digital pressure gauge, is the appropriate choice. Installing a non-approved instrument in a hazardous area creates a serious safety risk and violates regulations.

Q9: What maintenance does the wireless sensor require?

The QWY-312 requires minimal maintenance. Periodically verify that the wireless link is healthy and the battery or supply voltage is adequate, check the cable gland and seals for damage, and clean the probe if fouling occurs in dirty media. The zero point can be checked by lifting the probe out of the liquid and confirming the display reads zero; a zero adjustment corrects minor deviations. For quality-critical applications, perform an annual calibration check against a reference. With its corrosion-resistant construction and low power design, the sensor typically operates for long periods with only these routine checks.

Q10: What support and customization do you provide?

As the manufacturer, we provide direct technical support for the QWY-312, including wireless link planning, installation guidance and troubleshooting. We offer OEM and ODM services such as custom ranges, custom cable lengths, wireless configuration, labeling and packaging, with a monthly supply capacity of 100 pieces and delivery within 5-8 working days. Every unit is factory-calibrated and tested before shipment, and calibration certificates are available on request. Contact us with your site details and measurement requirements, and we will recommend the right configuration and provide a quotation.

Why Choose Our Corrosion-Resistant Wireless Level Sensor?

The QWY-312 solves the two biggest problems in difficult level monitoring: getting the data out and keeping the sensor alive. Wireless transmission removes cable cost and risk, 316L construction survives corrosive media, the LCD display serves field crews, and ±0.1%FS accuracy keeps the data trustworthy. As the manufacturer, you get factory calibration, engineering support and fast delivery. When the measurement point is hard to reach and the medium is hard on sensors, choose the QWY-312.