Explosion Proof Continuous Wave Radar Level Sensor for Hazardous Process Service

Hazardous areas demand instruments that are certified safe and still measure reliably through the toughest conditions: dust, powders, corrosive vapors and heavy steam. The QWRD80G609 explosion proof FMCW radar level sensor delivers certified protection, <0.1% precision and a -40 to +250 °C rating for the most demanding solid and liquid level applications.

Why Do You Need an Explosion Proof Continuous Wave Radar?

In plants handling flammable dusts, gases and vapors, every instrument must be certified for the hazardous area, because a single ignition source can turn a storage silo or process vessel into a catastrophe. At the same time, the media in these plants are often the hardest to measure: powders that create dust clouds, corrosive chemicals that attack sensors, and processes with heavy steam that blind ultrasonic and optical instruments. A continuous wave radar with explosion proof certification answers both requirements: it is approved for hazardous installation, and its FMCW microwave measurement penetrates dust, steam and vapor to deliver precise, non-contact level data. For cement, chemicals, food powders, plastics and petrochemicals, this combination of safety and capability is exactly what the application demands.

Working Principle: Certified FMCW Radar Measurement

The QWRD80G609 transmits a continuous, frequency-modulated microwave signal toward the product surface. The reflected signal is compared with the transmitted signal, and the frequency difference, which is proportional to distance, is processed to calculate the level with a precision better than 0.1%. The 80GHz high-frequency signal penetrates dust clouds and steam atmospheres that defeat lower-frequency instruments, while the non-contact measurement avoids wear and contamination from abrasive powders and corrosive media. The instrument is housed in a stainless steel explosion proof enclosure certified for hazardous areas, and can be powered as a two-wire loop at DC 24±6 V or as a four-wire unit at AC 220 V, with a process temperature capability of -40 to +250 °C.

Structural Advantages of the QWRD80G609

• Explosion proof certification: approved for hazardous area installation.
• <0.1% measurement precision: reliable accuracy for process control.
• Continuous wave FMCW technology: stable measurement in dust and steam.
• Process temperature -40 to +250 °C: handles hot processes and cold environments.
• Stainless steel housing: corrosion-resistant and robust.
• Flange connection from DN80: standard industrial mounting.
• Dual power options: two-wire DC24±6V or four-wire AC220V.
• Handles powders, solids, corrosive media: broad media compatibility.

Pain Point Analysis: 2 Challenging Working Conditions

Application Cases

Product Advantages

• Explosion proof certification for hazardous areas
• <0.1% measurement precision
• 80GHz FMCW continuous wave technology
• Process temperature range -40 to +250 °C
• Stainless steel corrosion-resistant housing
• Flange connection from DN80
• Two-wire DC and four-wire AC power options
• Suitable for powders, solids and corrosive media

Technical Parameters

SEO FAQ

Q1: What is continuous wave radar level measurement?

Continuous wave radar, also called FMCW (frequency-modulated continuous wave) radar, transmits a continuous microwave signal whose frequency sweeps linearly over time instead of sending short pulses. The signal reflects off the product surface, and the electronics measure the frequency difference between the transmitted and reflected signals at the same instant. Because this frequency difference is directly proportional to the distance to the surface, the level is calculated with high resolution and precision. Continuous wave radar provides superior signal processing compared with pulse radar, making it more reliable in difficult conditions such as dust, steam, condensation and weak reflections from powders and solids.

Q2: Why is explosion proof certification important for this sensor?

Explosion proof certification means the sensor has been tested and approved for installation in hazardous areas where flammable gases, vapors or dusts may be present. The instrument is designed to contain any internal ignition so that it cannot ignite the surrounding atmosphere. Installing a non-certified instrument in a hazardous area creates a serious risk of fire or explosion and violates safety regulations. The QWRD80G609 carries explosion proof certification, making it suitable for silos and vessels handling flammable powders, chemicals and hydrocarbons. When ordering, please specify your area classification so we can confirm the certification matches your installation requirements.

Q3: How does the sensor measure through dust and steam?

Dust and steam scatter and attenuate measurement signals, which defeats ultrasonic sensors and low-frequency radars. The QWRD80G609 uses an 80GHz high-frequency microwave signal, whose short wavelength penetrates dust clouds, vapor and heavy steam far more effectively than lower frequencies. In addition, the FMCW continuous wave processing analyzes the complete frequency spectrum of the return signal, allowing the electronics to identify the true product echo among the noise created by suspended particles and droplets. This combination keeps the level reading stable and accurate even during pneumatic filling of silos and in vessels with heavy condensation and vapor.

Q4: What power supply options are available?

The QWRD80G609 offers two power supply configurations. The two-wire version operates on DC 24±6 V, using the same two wires for power and the 4-20 mA signal, which is the standard loop-powered arrangement in most plants. The four-wire version operates on AC 220 V, providing a separate power supply with independent signal wiring, which is convenient where AC power is readily available or where higher power is needed for certain configurations. This flexibility allows the sensor to be integrated into plants with either DC loop infrastructure or AC power distribution, simplifying installation in both new and existing facilities.

Q5: What customization and support do you provide?

As the manufacturer, we provide direct engineering support for the QWRD80G609, including hazardous area classification guidance, antenna and flange selection, and installation advice. Customization options include measuring range, process connection from DN80 and above, antenna types for different media, power supply configuration, output protocol, labeling and packaging, plus OEM and ODM programs. With a monthly supply capacity of 100 pieces and delivery within 5-8 working days, we support both individual projects and series production. Contact us with your area classification, media and vessel details for a recommendation and quotation.

Why Choose Our Explosion Proof Radar Level Sensor?

Safety and measurement performance are not negotiable in hazardous processes, and the QWRD80G609 delivers both. Its explosion proof certification, 80GHz FMCW technology, <0.1% precision and -40 to +250 °C capability make it the dependable choice for powder silos, corrosive service and high-temperature vessels. As the manufacturer, you receive certified instruments, flexible power and connection options, and direct engineering support. When the atmosphere is hazardous and the media is demanding, choose the radar sensor that is certified for both.