OTT HydroMet - Model PLS-C -Pressure Probe With Conductivity Measurement 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)

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

• 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