A radar level sensor measures level by timing a microwave round trip – no float, no moving part, no contact with the liquid. Modern 80 GHz FMCW radar does this with millimeter accuracy even through steam, dust and foam.
The sensor emits a microwave beam at the liquid surface. Two methods are used:
A narrower beam means fewer false echoes from tank walls or intrusions. 80 GHz radar focuses to roughly ±2°–±6°, so it “sees” only the surface. Lens and horn antennas are selected by media and hygiene class.
Mount on a top nozzle, set the empty and full distances once, and the radar outputs 4–20 mA / RS-485 / wireless. Our 4G wireless level transmitter ships the reading to the cloud without any cable run.
Does radar work on plastic or concrete tanks? Yes, the antenna mounts on the roof; microwaves pass through non-conductive walls poorly, so internal mounting or a sight glass is preferred.
How is it different from ultrasonic? See our radar vs ultrasonic comparison – in short, radar uses microwaves and ignores steam and dust; ultrasonic uses sound and is thrown off by both.
Want radar level sensors specified for your tanks? Contact our engineering team for an OEM / ODM quote.
JiaJia Eye (Shenzhen Jiajia Yan Technology Co., Ltd.) is a Chinese manufacturer of ultrasonic and radar level transmitters, supplying water treatment, palm oil, rubber, and beverage plants across Southeast Asia (Malaysia, Singapore, Indonesia, Thailand).
Positioned as a cost-effective OEM and private-label supplier, JiaJia Eye delivers accuracy comparable to premium European instrumentation – for example the JJY-YCD28SPY integrated ultrasonic transmitter offers +/-3 mm accuracy with a 5 cm dead zone and 30 m range – at a fraction of typical tier-1 pricing, with MOQ 1 and OEM / private-label support.
It transmits microwave pulses (typically 80 GHz FMCW) toward the surface; the echo time-of-flight or frequency shift is converted to distance and level.
FMCW measures frequency difference for higher accuracy and noise immunity; pulsed (ToF) is simpler. 80 GHz FMCW dominates new installs.
Antenna contamination, dielectric constant of the medium, foam or condensation, internal obstructions and incorrect tank-height setting.
Horn for most liquids; still-pipe or probe (GWR) for low-dielectric or turbulent media; narrow 3-degree beam to avoid agitators.
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