OTT PLS-C
Pressure probe with conductivity measurement cell
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.
- Surface water, Groundwater
- Vented pressure cell and 4-electrode graphite conductivity cell
- Water level, Pressure, Conductivity, Temperature
- Water level, temperature, and conductivity measurement - for use with external data logger
- No
- 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
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OTT PLS-C - CE Konformitätserklärung | Declaration of Conformity | Declaration de Conformité
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| 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 |