LR20 Radar Level Sensor
- Manufacturer: Nesa
- Category: SENSORS, Level Sensors, Level Sensors for Liquids
The NESA LR20 is a K-band radar water level sensor from the VEGAplus series, featuring a microwave transducer housed in a resin body. It is used for measuring water levels in open fields or stilling basins and is a programmable hydrometer and nivometer.
Typical range 0÷20 m (also 0÷15, 0÷35 and 0÷75 m), sensitivity 1 mm, accuracy 0.01% fs (±2 mm), response time < 1 s and typical beam angle 5°. Output 4÷20mA (LR20-B), resin housing IP66 – IP68 (0.2 bar).
Key points
- Typical range 0÷20 m; other ranges 0÷15 m, 0÷35 m, 0÷75 m
- Sensitivity 1 mm; accuracy 0.01% fs (±2 mm); response time < 1 s
- K-band radar (<25GHz); typical beamwidth 5°
- 4÷20mA output; with MCS module (optional) 0÷2Vdc (A) or RS485 / Modbus (C)
- Power supply: current loop or 10–28 Vdc; protections against reverse polarity and transients
- Operating conditions -40 ÷ +80°C; resin housing IP66 – IP68 (0.2 bar); 285 x 72 mm; <350 g; CE
Technical Frequently Asked Questions
What does LR20 measure?
The water level, with a K-band radar transducer (<25GHz), in open field or in calm water tubes.
What is its range and accuracy?
Typical range 0÷20 m; also 0÷15, 0÷35 and 0÷75 m. Accuracy 0.01% fs (±2 mm) and sensitivity 1 mm.
What kind of outlet and power supply does it have?
4÷20mA output (LR20-B), with MCS module (optional) 0÷2Vdc (A) or RS485 / Modbus (C). Power supply: current loop or 10÷28 Vdc.
What level of protection does it have?
IP66 – IP68 (0.2bar) resin enclosure, with protection against reverse polarity and transients.
What references are there?
LR15-B (0÷15 m), LR20-B (0÷20 m) and LR35-B (0÷35 m), all with 4÷20mA output.
How do I order it?
Sensor (LR20, with the indicated range), output (B), cable (CS05, CS10 or CSxx) and bracket (SSU or SS-P1). Manufacturer's example: LR20 B 10 SSU.
Properties
| Feature | Specification |
|---|---|
| Measurement and operating principle | |
| Measured magnitude | Water level |
| Transducer type | K-band radar (<25GHz) |
| Typical range | 0÷20 m |
| Other ranges | 0÷15 m, 0÷35 m, 0÷75 m |
| Sensitivity | 1 mm |
| Accuracy | 0.01% fs (±2 mm) |
| Response time | < 1 s |
| Beam aperture (typical) | 5° |
| Regulatory compliance | EC |
| Exit signals | |
| Output signal (LR20-B) | 4÷20mA |
| With MCS module (optional) | 0÷2Vdc (A) or RS485 / Modbus (C) |
| Power supply, environment, and mechanical data | |
| Food and consumption | Current loop or 10÷28 Vdc |
| Operating conditions | -40 to +80°C |
| Protections | Against polarity reversal and transients |
| Box | IP66 – IP68 resin (0.2 bar) |
| Dimensions | 285 x 72 mm (see drawing) |
| Weight | <350g |
| Reference | Configuration |
|---|---|
| LR15-BLR15B | Range: 0-15 m · Output: 4-20 mA · Supplied with: Calibration report and 5 m cable |
| LR20-BLR20B | Range: 0-20 m · Output: 4-20 mA · Supplied with: Calibration report and 5 m cable |
| LR35-BLR35B | Range: 0÷35 m · Output: 4÷20mA · Supply: With calibration report |
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