OTT HydroMet

- Model OTT RLS - Radar Water Level Sensor

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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 data loggers. The RLS has extremely low power consumption and is ideal for remote or solar powered sites.

  • Application: Surface water
  • Parameters measured: Water Level / distance to water
  • Measurement technology: Non-contact pulse radar
  • Product highlights:Measures water level or depth to water from a bridge, pier or mounting arm
  • Measurement range:1.3-115 ft (0.4-35 m)
  • Accuracy: 1.3-6.6ft: ±0.03 ft; 6.6-98.5 ft: ±0.01 ft; 98.5-115: ±0.03 ft
  • Internal data logger: No
  • Interface: SDI-12, RS-485 (using SDI-12), or 4 ...20 mA

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

  • 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

Water Level Measurements :

  • Measuring range : 1.3-115 ft.
  • Transmitting Frequency : 25.2 GHz Pulse Radar (FCC Version)
  • Resolution SDI-12 output : 0.01 ft
  • Accuracy (SDI-12) : 1.3-6.6 ft: ±0.03 ft, 6.6-98.5 ft: ±0.01 ft, 98.5-115 ft: ±0.03 ft
  • Average temperature coefficient (-10 … +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
  • Power Requirements : 5.4 to 28 Vdc
  • Power consumption in active mode : < 15 mA @ +12 V equal to
  • Power consumption in rest mode : < 0.05 mA @ +12 V equal to
  • Interfaces : 4 ... 20 mA, SDI-12, RS-485 (SDI-12 Protocol)
  • Housing : ASA (UV-stabilized ABS)
  • Radom (front plate) : TFM PTFE
  • Mounting bracket : 1.4301 (V2A)
  • Lateral axis : ±90 º
  • Longitudinal axis : ±15 º
  • Dimensions L x W x H : 8.7 in. x 6.0 in. x7.5 in.
  • Weight (incl. mounting bracket) : 4.6 lbs
  • Operating temperature: : -40 ... +60 °C
  • Storage temperature : -40 ... +85 °C
  • Relative humidity : 0 ... 100 %
  • With horizontal mounting : IP67 (submersion depth max. 1 m; submersion duration max. 48 h)
  • USA FCC ID : FCC ID: OA6RLS252

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