Water Level

Water Level Sensing Technology

Measuring water level is one of the most common surface water quantity measurements which is typically used for developing and computing stage discharge relationships or controlling water resources.

Continuous, real-time measurements and images can provide flood warning information, including alarms, for water levels that hit or exceed critical threshold levels to prompt manual or automatic responses such as evacuations during flooding and field operations.

OTT HydroMet develops and manufactures water level sensing technology, evolving system solutions from mechanical and labor-intensive to low maintenance.

Offering Contact and Non-Contact Surface Water level Sensors OTT HydroMet's two leading brands - OTT and SUTRON, offer contact and non-contact surface water level sensors featuring a variety of measurement technologies (radar, bubbler, pressure) to meet stream gaging needs for reliable data.

Our Products


OTT ecoLog 1000 Water Level Logger

The OTT ecoLog 1000 is a self-contained groundwater level logger for measuring water level and temperature, providing reliable and accurate data with integrated mobile communication.

• Application: Surface water, Groundwater
• Measurement technology: Vented pressure cell
• Parameters measured: Water level/pressure, water temperature
• Product Highlights: Integrated modem (4G / 2G), Bluetooth Low Energy (BLE), operation via APP, Lithium Powerpack with plug, exact battery level indicator, service life > 10 years
• Measurement range: 0 … 4, 10, 20, 40, and 100m
• Accuracy: ± 0.05 % FS
• Internal data logger: Yes

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OTT SE 200

The OTT SE200 float-operated shaft encoder level sensor provides proven water level measurements in continuous, unattended monitoring in ground and surface water applications.

• Application: Surface water, Groundwater
• Measurement technology: Float-operated Shaft Encoder
• Parameters measured: Water level
• Product Highlights: Continuous water level measurement - for use with external data logger
• Measurement range: ±30 m
• Internal data logger: Yes
• Interface: SDI-12 or 4 ...20 mA

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OTT Maximum Level Gauges

The OTT Maximum Level Gauge is a cost-effective measuring device that indicates the maximum water level by tidal waves or other level fluctuations over a color marking.

• Application: Surface water
• Measurement technology: Visual, color tape
• Parameters measured: Water level
• Product Highlights: Records high tide or surface water level
• Measurement range: 1 m

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OTT Staff Level Gauges

Staff gauges from OTT as basic equipment for every level / discharge gauging station. And as all gauging stations are different, you can choose from several model variants.

• Measurement technology: Visual
• Parameters measured: Water level
• Product Highlights: On-site water level reference
• Measurement range: Customized
• Accuracy: 2 cm

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OTT PLS - Pressure Level Sensor

The OTT PLS, SDI-12 or 4 ... 20 mA pressure probe, measures water level, depth to water, or pressure using an integrated controller and ceramic pressure-measuring cell.

• Application: Surface water, Groundwater
• Measurement technology: Vented pressure cell
• Parameters measured: Water level, Pressure, Temperature
• Product Highlights: Water level and temperature measurement - for use with external data logger
• Measurement range: 0 … 4, 10, 20, 40, and 100m

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OTT Contact Gauges

OTT Contact Gauges are essential for manual water level measurements in groundwater. For measuring depth to water, temperature, and conductivity – depending on the variant.

• Application: Groundwater
• Measurement technology: Contact gauge
• Parameters measured: Water level / Distance to water, Temperature, Conductivity
• Product Highlights: Manual water level, temperature and/or conductivity measurement
• Measurement range: Measuring tape lengths KL010: 15 ... 750 m; KL010 TM: 25 ... 500 m; KL010 TCM 30 ... 500 m

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OTT ecoLog 800 Water Level Logger

The OTT ecoLog 800 is a self-contained system for measurement of water level, temperature, and conductivity in groundwater and surface water applications.

• Application: Surface water, Groundwater
• Measurement technology: Vented pressure cell and 4-electrode graphite conductivity cell
• Parameters measured: Water level/Pressure, Water temperature, Conductivity
• Product Highlights: Measures, stores, and transmits water level and temperature data
• Measurement range: 0 … 4, 10, 20, 40, and 100m
• Accuracy: ± 0.05% FS
• Internal data logger: Yes

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OTT ecoLog 500 Water Level Logger

The OTT ecoLOG 500 is a self-contained water level instrument offering flexible remote data options and unequaled performance for the price.

• Application: Surface water, Groundwater
• Measurement technology: Vented pressure cell
• Parameters measured: Water level/Pressure, Water temperature
• Product Highlights: Measures, stores, and transmits water level and temperature data
• Accuracy: ± 0.05% FS
• Internal data logger: Yes

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OTT RLS - Radar Level Sensor

The OTT RLS is a non-contact radar level sensor with pulse radar technology that is ideal for monitoring in remote or hard to reach locations

• Application: Surface water
• Measurement technology: Non-contact pulse radar
• Parameters measured: Water level / distance to water
• Product Highlights: Measures water level or depth to water from a bridge, pier or mounting arm
• Measurement range: 0.4 … 35m
• Accuracy: 0.8 … 2m: ± 10mm; 2 … 30m: ± 3mm; 30 … 35m: ± 10mm
• Internal data logger: No
• Interface: SDI-12, RS-485 (using SDI-12), or 4 ...20 mA

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OTT CBS - Compact Bubbler Sensor

The OTT CBS is a compact, accurate, and low power bubbler sensor for surface or groundwater level monitoring.

• Application: Surface water, Groundwater
• Measurement technology: Bubbler-in
• Product Highlights: Drift-free water level measurement - no pressure sensor or electronics in the water
• Measurement range: 0 to 15 m or 0 to 30 m
• Accuracy: ± 3 mm (high accuracy version); ± 5 mm (standard and 30 meter versions)
• Internal data logger: No
• Interface: SDI-12, RS-485 (using SDI-12), or 4 ...20 mA

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OTT Orpheus Mini Water Level Logger

The OTT Orpheus Mini is an integrated pressure sensor and datalogger for level measurement in surface and groundwater applications.

• Application: Surface water, Groundwater
• Measurement technology: Vented pressure cell
• Parameters measured: Water level/Pressure, Water temperature
• Product Highlights: Measures and stores water level and temperature data
• Measurement range: 0 … 4, 10, 20, 40, and 100m
• Accuracy: ± 0.05% FS
• Internal data logger: Yes

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OTT CTD Sensor

The OTT CTD is an integrated sensor and datalogger for measurement of water level, temperature, and conductivity in groundwater and surface water applications.

• Application: Surface water, Groundwater
• Measurement technology: Vented pressure cell and 4-electrode graphite conductivity cell
• Parameters measured: Water level, Temperature, Conductivity
• Product Highlights: Measures and stores water level, temperature, and conductivity data
• Measurement range: Water level: 0 … 4, 10, 20, 40, and 100 m
• Conductivity: 0.001…2.000 mS/cm, 0.10…100.00 mS/cm
• Accuracy: ±0,05 % FS
• Internal data logger: Yes

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OTT PLS-C

The OTT PLS-C measures water conductivity, level, and temperature in both surface and groundwater applications via a robust ceramic pressure cell and 4-electrode conductivity cell.

• Application: Surface water, Groundwater
• Measurement technology: Vented pressure cell and 4-electrode graphite conductivity cell
• Parameters measured: Water level, Pressure, Conductivity, Temperature
• Product Highlights: Water level, temperature, and conductivity measurement - for use with external data logger
• Internal data logger: No
• Interface: SDI-12 or RS-485 (using SDI-12)

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