OTT HydroMet - Model OTT PLS-C - Pressure Probe with Conductivity Measurement Cell
From Water Level
The OTT PLS-C measures water conductivity, level, and temperature in both surface and groundwater applications with a robust ceramic pressure cell and 4-electrode conductivity cell. Its extremely low power consumption makes it ideal for long-term deployment, particularly at solar powered measuring stations for ground-and surface waters.
Product Highlights
- 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)
Advantages:
Outputs for conductivity include specific conductivity, salinity, and total dissolved solids
- The robust ceramic pressure cell offers industry-leading accuracy and does not deform over time like membrane technology, providing long-term measurement stability
- Rugged design: Ceramic pressure cell resistant to physical force (4 x burst pressure) and enclosure made of high-quality saltwater resistant steel for use in coastal environments
- Vented pressure probe, automatically compensates for changes in barometric pressure
- Robust cable with Kevlar core for length stabilization and capillary tube for venting
- Built-in microcontroller – compensates for temperature effects and applies correction values for gravitational acceleration or water density
- Simple setup and connection to external dataloggers using SDI-12
Example of Use
Water level, temperature, and conductivity measurement of:
- Groundwater wells
- Streams, rivers, channels, and canals
- Reservoirs, lakes, and wetlands
Ideal for monitoring:
- Continuous monitoring networks
- Short-term or long-term projects
- Salt water intrusion
- Aquifer storage and recovery
- Estuaries and wetlands
Technical Data
- Output parameters: Water level/pressure, temperature, specific conductivity, salinity, TDS
- Water level measurement (pressure):
- Pressure sensor: ceramic, temperature-compensated
- Measuring range: 0 ... 4 m, 0 ... 10 m, 0 ... 20 m, 0 ... 40 m, 0 ... 100 m water col.
- Resolution: 0.001 m; 0.1 cm; 0.01 ft; 0.1 mbar; 0.001 psi
- Accuracy (linearity + hysteresis): ≤ ± 0.05 % FS
- Long-term stability (linearity + hysteresis): ≤ ± 0.1 %/a FS
- Zerodrift: ≤ ± 0.1 % FS
- Pressure sensor capability to withstand overloads without permanent mechanical damage: ≥ 4 x measuring range
- Temperature-compensated operating range: -5 °C ... +45 °C (ice free)
- Units: m, cm, ft, mbar, psi
- Temperature measurement:
- Sensor: NTC
- Measuring range: -25 °C ... +70 °C (ice free)
- Calibrated range: +5 °C ... 45 °C
- Resolution: 0.01 °C
- Accuracy: ±0.1 °C
- Units: °C, °F
- Conductivity measurement:
- Sensor: 4 graphite electrodes
- Calibrated range: +5 °C ... 45 °C
- Measuring range 5 ... 2.000 µS/cm:
- Resolution: 1µS/cm
- Accuracy: ±1 µS/cm or ± 0.5 % of measured value (whichever is higher)
- Unit: µS/cm
- Measuring range 0.1 ... 100 mS/cm:
- Resolution: 0.01 mS/cm
- Accuracy: ± 0.01 mS/cm or ±1.5 % of measured value (whichever is higher)
- Unit: mS/cm
- Options:
- Temperature compensation, conductivity: freshwater, saltwater, standard method 2510, ISO 7888/EN27888
- Salinity calculation: Standard method or USGS 2311
- Electrical data:
- Supply voltage: 6 ... 27 V DC, typically 12/24 V DC
- Power consumption:
- SDI-12 sleep-mode: <30 µAV
- SDI-12 active-mode: <32 mA
- Interfaces: SDI-12, RS-485 (SDI-12 protocol)
- Mechanical data:
- Dimensions:
- Probe (Ø x h): 317 mm x 22 mm
- Cable length: SDI-12: 1 ... 100 m
- RS-485: 1 ... 1000 m
- Material:
- Housing material probe: POM, stainless steel
- (DIN 1.4539, 904 L ), resistant to sea water
- Cable jacket: PUR
- Weight:
- Probe: approx. 0.43 kg
- Probe cable: approx. 82 g/m
- Ambient conditions:
- Storage temperature: - 40 °C ... + 85 °C
- Type of protection: Probe: IP 68
- EMC limits: EG 2004/108/EG, EN 61326-1:2013
Applications
-
Water monitoring technology for urban hydrology - Environmental
Urban Hydrology deals with the specific aspects of the hydrological cycle in urban and industrial settings. This includes all natural water flows as well as the consideration of precipitation, storm water, groundwater, rivers, and lakes, but also the infrastructure and systems for water supply and sanitation in a city.
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Water monitoring technology for groundwater sector - Soil and Groundwater
Measuring groundwater level or depth-to-water is critically important for identifying long term trends, including declining water levels, saltwater intrusion, seasonal variations, aquifer recharge, artificial aquifer storage and recovery, and level status for drinking water. Receiving groundwater data via remote data transmission from one of the many OTT telemetry options available saves time and resources spent in the field.
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Water monitoring technology for hydropower - Energy - Hydro Power
Monitoring the impact of Hydropower plant activities on water bodies can be important for regulatory compliance and modeling purposes.
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Water monitoring technology for mining - Mining
Ensuring that pollutants from mining activities do not enter surrounding natural water bodies is a key issue in environmental monitoring and regulatory compliance.
Downloads related to this product
Pressure Probe OTT PLS - Operating Instructions Manual
OTT Hydromet - Model PLS-C - Pressure Probe with Conductivity Measurement Cell - Datasheet
OTT PLS-C Pressure Probe with Conductivity Sensor - Operating Instructions
OTT PLS-C Pressure Probe with Conductivity Sensor - Leaflet
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