A radar level transmitter measures level without contacting the medium. It sends microwave signals toward the product surface and evaluates the reflected signal to determine the distance and level. It is used for continuous level measurement of liquids, solids and slurries.

The transmitter emits electromagnetic (microwave) signals through an antenna or lens. The signal is reflected by the product surface and received again, and the transmitter calculates the distance from the travel time and converts it into level. High operating frequencies and short wavelengths are particularly suitable for solids, and offer advantages in high-dust and high-temperature (+150 °C) environments.

• Non-contact and maintenance-free measurement
• Precise measurement and reading
• Adjustable analog output range
• Customizable serial port data format
• Data backup and recovery

A non-contact radar transmits microwaves through the vapour space to the product surface. A guided wave radar conducts microwave pulses along a cable or rod probe, which is in contact with the medium, and the pulses are reflected by the product surface. Guided wave radar is generally chosen for media with low dielectric constant, foam, or narrow vessels. See the MIK-RD701 and MIK-RD702 guided wave models.

• WSR550 (76–81 GHz): two-wire and four-wire versions, several models, range up to 60 m, for challenging environments
• WSR201 (60 GHz): long detection distance, low beam energy, for metal and non-metal vessels and pipes, and for dust, water mist, inert gas and steam
• MIK-RD909 (26 GHz): measuring range up to 70 m, small beam angle and strong anti-interference
• MIK-RD902 (26 GHz) and MIK-RD902T (26 GHz, PTFE): storage tanks, corrosive media and tank gauging
• MIK-RD902S: high temperature and high pressure applications
• MIK-RD901: PTFE sensor material for corrosive liquids
• MIK-RD906 (26 GHz): tank radar for solids and low dielectric constant media
• MIK-RD905 and MIK-RD904: solid particles and powders
• MIK-RD903: solids with heavy dust, crystallization or condensation
• MIK-RD908: river and open channel level measurement
• MIK-RD701 / MIK-RD702: guided wave radar, with PTFE antenna on the RD702 for corrosive media

If you are unsure, send us your application details and our engineers will recommend a model.

Yes. Radar level transmitters are used for liquids, solids and slurries. For powders and granular solids, a higher frequency with a narrow beam is generally preferred; see the MIK-RD903, MIK-RD904, MIK-RD905 and MIK-RD906 models.

The dielectric constant determines how strongly the medium reflects microwaves. Media with a low dielectric constant, such as some plastics, powders and hydrocarbons, reflect less energy, so a higher frequency, a larger antenna or guided wave radar may be needed. Please tell us the medium so we can confirm a suitable model.

Radar is generally less affected by dust, water mist, inert gas and steam than ultrasonic measurement, and high-frequency models are designed for these conditions. Heavy foam and strong condensation can still weaken the signal, in which case guided wave radar may be more suitable. Please describe your process conditions.

A higher frequency gives a narrower beam and better focusing, which helps in vessels with internal obstructions and with solids and low-reflection media. 26 GHz models such as the MIK-RD902 and MIK-RD909 cover many standard applications, while the 60 GHz WSR201 and 76–81 GHz WSR550 are used where a narrow beam or higher performance is needed.

The range depends on the model: the WSR550 covers up to 60 m and the MIK-RD909 up to 70 m. Please check the product page or tell us your vessel height.

Yes. The WSR550 supports both two-wire and four-wire applications and is available in several models. Please tell us your power and output requirements.

Yes. Radar level meters use low beam energy and are stated to be harmless to the human body and the environment, and they can be installed in metal and non-metal containers or pipelines.

The MIK-RD901, MIK-RD902T and MIK-RD702 use PTFE sensor or antenna materials for corrosive and aggressive media. Please send us your medium and concentration for confirmation.

The MIK-RD902S is intended for high temperature and high pressure applications. Please tell us your process temperature and pressure so we can confirm the configuration.

Yes. The MIK-RD908 is designed for river level measurement with top-down installation. Please tell us your bridge or bank mounting conditions and measuring range.

• Radar: non-contact, less affected by vapour, dust, temperature and pressure; suitable for demanding process conditions and solids.
• Ultrasonic: non-contact and cost-effective for many liquids and solids in vented vessels; more affected by foam, vapour and dust.
• Hydrostatic: contact measurement based on liquid pressure; not affected by surface conditions or vapour.

• Mount the antenna perpendicular to the product surface.
• Keep the maximum level below the blind zone of the selected model.
• Avoid inlets, agitators, ladders and other obstructions in the beam path.
• Keep a suitable distance from the vessel wall.
• For solids, aim the antenna at the material surface, considering the angle of repose.

Please follow the installation manual of the selected model.

Radar measurement is non-contact and virtually maintenance-free, since nothing moves and nothing is immersed. For media that build up on the antenna, periodic inspection and cleaning is recommended.

Typical industries include water and wastewater, chemical, oil and gas, food and beverage, pulp and paper, mining, energy storage and cooling, and HVAC.

To help us select the correct model, please provide:

• Medium (liquid, slurry or solid) and its dielectric constant if known
• Measuring range and vessel or channel dimensions
• Process temperature and pressure
• Process conditions: dust, vapour, foam, condensation, corrosion
• Mounting connection and vessel internals
• Output and power requirements (two-wire or four-wire)
• Hazardous area requirements (if any) and quantity

Send your requirements to info@asmik.com or contact us via WhatsApp at +86 13325716921.