Guided Wave Radar Level Transmitter
JJY guided wave radar (GWR) level transmitters use Time-Domain-Reflectometry (TDR): a low-energy microwave travels down a probe (rod or cable) and reflects at the product surface. Because the signal is guided, it is unaffected by vapor, foam, or turbulent surfaces – making GWR ideal for difficult liquids and interface measurement.
Where Guided Wave Radar Excels
- Interface measurement – separate two immiscible liquids by dielectric contrast.
- Turbulent / boiling tanks – the probe ignores surface agitation.
- Small vessels – no beam-angle clearance required.
- Conductive media – reliable reading of water-based and chemical liquids.
Probe Options
- Rod probe – for clean liquids and short ranges.
- Cable probe – for tall tanks and bulk solids.
- Coaxial probe – for very low dielectric or sticky media.
Output & Integration
Standard 4-20mA and RS485/Modbus output drops into existing PLC/SCADA. For non-contact alternatives in still, clean media, see our ultrasonic level transmitters or 80GHz radar transmitters.
About JiaJia Eye
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 20 m range – at a fraction of typical tier-1 pricing, with MOQ 1 and OEM / private-label support.
Frequently Asked Questions
What is guided wave radar (GWR) vs non-contact radar?
GWR guides the microwave along a probe (rod or cable) through the medium; best for low-dielectric liquids, turbulent surfaces and interface measurement. Non-contact radar measures free space above the liquid.
When should I choose GWR?
For low-dielectric liquids (e.g. hydrocarbons), foaming or turbulent surfaces, and where a narrow beam cannot find a clear path.
Accuracy and installation?
+/-2 mm typical; probe length set to tank height; top-mounted, no moving parts.
Outputs and OEM?
4-20 mA / RS485 / HART; OEM available.
