OTT RLS - Radar Level Sensor
Non-contact water level sensor for long term surface water measurements
The OTT RLS is a non-contact radar level sensor with pulse radar technology. The OTT RLS offers a large measurement range with a small blanking distance and narrow beam width and it easily connects to most dataloggers. The RLS has extremely low power consumption and is ideal for remote or solar powered sites.
- Surface water
- Water level / distance to water
- Non-contact pulse radar
- Measures water level or depth to water from a bridge, pier or mounting arm
- 0.4 … 35 m
- 0.8 … 2 m: ± 10 mm; 2 … 30 m: ± 3 mm; 30 … 35 m: ± 10 mm
- No
- SDI-12, RS-485 (using SDI-12), or 4 ...20 mA
- No drift over time
- High Performance–Measurements are unaffected by air temperature, humidity, flood events, floating debris, or contaminated water; reduces the likelihood of missing data and reduces data post processing
- Low Maintenance–Flat antenna design eliminates nesting areas for insects and periodic maintenance requirement
- Flexible Integration/Easy Setup–Connects to most data loggers via standard communication interfaces, SDI-12 or 4 ... 20 mA; no need for additional PC software
- Simple Installation–Light weight compact design facilitates easy mounting on bridges, extension mounting bracket or inside a small protective housing
- Low Profile Design–Unobtrusive appearance is ideal for urban installation sites or sites prone to vandalism
- Low Power Consumption–Ideal for remote or solar powered sites; requires only 12 mA when active
For surface water level measurement of:
- Streams and rivers
- Tidal zones
- Reservoirs and lakes
Ideal for monitoring:
- Surface waters prone to flooding
- Sediment or debris laden streams and rivers
- Migrating channels
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OTT RLS - DIN EN ISO 4373 Declaration of Conformity | Declaration de Conformité | Konformitätserklärung
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| Water level measurements | |
| Measuring range - distance to water surface | 0.4 ... 35 m |
| Resolution SDI-12 output | 0.001 m |
| Accuracy (SDI-12) | 0.4 ... 2.0 m: ±10 mm; 2.0 ... 30 m: ±3 mm; 30 ... 35 m: ±10 mm |
| Average temperature coefficient (-20 ... +40 °C) | 0.01 % full scale/10 K |
| Accuracy (4 ... 20 mA) | ±0.1 % full scale |
| Average temperature coefficient | 10 ppm full scale/°C (at 20 °C) |
| Measuring time | 20 s |
| Beam angle of antenna (width of beam) | 12 º |
| Electrical data | |
| Power supply | 5.4 ... 28 V DC, typ. 12/24 V DC |
| Power consumption in active mode (at 12 V) | <24 mA |
| Power consumption in rest mode (at 12 V) | <0.05 mA |
| Interfaces | 4 ... 20 mA, SDI-12, RS-485 (SDI-12 Protocol) |
| Material | |
| Housing | ASA (UV-stabilized ABS) |
| Radom (front plate) | TFM PTFE |
| Mounting bracket | 1.4301 (V2A) |
| Lateral axis | ±90 º |
| Longitudinal axis | ±15 º |
| Dimensions and weight | |
| Dimensions L x W x H | |
| Weight (incl. mounting bracket) | approx. 2.1 kg |
| Operating temperature: | -40 ... +60 °C |
| Storage temperature | -40 ... +85 °C |
| Relative humidity | 0 ... 100 % |
| Type of protection | |
| With horizontal mounting | IP67 (submersion depth max. 1 m; submersion duration max. 48 h) |
| EMV limits and radio approvals | |
| EMV for low power radio devices | ETSI EN 301 489-3 |
| Low-voltage device safety | EN 60950-1 |
| Radio approval for low power radio devices* Short Range Device (SRD) | |
| Europe | ETSI EN 300 440 |
| USA | FCC 47 CFR Part 15 |
| Canada | RSS 210 Issue 7 |
How do I communication with my sensor using the RS-485 interface?
Communication on this interface follows the SDI-12 protocol. This follows a specific timing which is defined by the SDI-12 standard. Please find detailed information in the attached/linked document. The sensor wont react to simple ASCII commands send through this interface as they do not conform to the SDI-12 standard.
Regarding PLS Sensor: The RS-485 interface might not be active by default. In this case it needs to be activated using the SDI-12 interface of the sensor. Our HydroService will assist you in this matter (HydroService@OTTHydromet.com).
Regarding CBS Sensor: The active interface of the sensor is determined by dip switches on the device. Please follow the sensor instruction to active the RS-485 interface.