OTT HydroMet

- Model PLS-C - Pressure Probe with Conductivity Measurement Cell

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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.

  • 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)

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

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

  • 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

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