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OTT PLS-C

    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  
    SDI-12 active-mode  
    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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