OTT PLS
Robust ceramic pressure cell
The OTT PLS measures water level, depth to water, or pressure by means of an integrated controller and ceramic pressure-measuring cell. Design features such as multiple communication outputs (SDI-12 or 4 ... 20 mA), stainless steel housing, and a rugged cable make this sensor ideal for monitoring water level in a variety of applications.
- Eaux de surface, Débitmétrie
- Vented pressure cell
- Water level, Pressure, Temperature
- Water level and temperature measurement - for use with external data logger
- 0 … 4, 10, 20, 40, and 100 m
- ± 0.05% FS
- Ja
- SDI-12, RS-485 (using SDI-12), or 4 … 20 mA
- 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 (5 x burst pressure) and enclosure made of high-quality saltwater resistant steel for use in coastal environments
- Built-in microcontroller – compensates for temperature effects and applies correction values for gravitational acceleration and water density
- Vented pressure probe, automatically compensates for changes in barometric pressure
- Robust cable with Kevlar core for length stabilization and capillary tube for venting
- Simple setup and connection to external dataloggers using SDI-12 or 4 ... 20 mA interfaces
- Optimized resolution is achieved by assigning the 4 ... 20 mA to that part of the measuring range that is actually required
- Water temperature output in addition to water level (for SDI-12 output)
Measuring water level in surface and groundwater, including:
- Stations with sloping bottom, e.g. water banks
- Small diameter pipes or holes (from 1" Ø)
- Dams, weirs, irrigation systems
- Waterways that occasionally ice over
- Brackish water, saltwater
- Waterways that do not contain water throughout the year (e.g. retaining basins)
| Water level measurement | |
| Measurement range | 0 ... 4 m, 10 m, 20 m, 40 m, 100 m |
| Accuracy | |
| SDI-12 | ±0.05 % FS (linearity and hysteresis) |
| 4 ... 20 mA | ±0.1 % FS (linearity and hysteresis) 10 ppm/°C at 20 °C |
| Resolution (SDI-12) | 0.001 m; 0.1 cm; 0.01 ft; 0.1 mbar; 0.001 psi |
| Temperature compensated working range | -5 °C ... +45 °C (ice-free) |
| Temperature measurement range | -25 °C ... +70 °C (ice-free) |
| Resolution | 0.1 °C / 0.1 °F |
| Accuracy | ±0.5 °C / ±0.9 °F |
| Electrical data | |
| Available interfaces (use as required) | 4 ... 20 mA, SDI-12, RS485 (via SDI-12 protocol) |
| Supply voltage | +9.6 ... +28 V DC, typically 12/24 V DC |
| Power consumption (SDI-12) | |
| Sleep | <600 µA |
| Active | <3.6 mA |
| Pressure sensor | (capacitive pressure sensor) ceramic, temperature compensated, overload safe for up to 5 times the measuring range without permanent mechanical damage |
| Temperature sensor | NTC |
| Dimensions | 195 mm x 22 mm |
| Weight | approx. 0.3 kg |
| Environmental conditions | |
| Operating temperature | -25 ... +70 °C |
| Storage temperature | -40 ... +85 °C |
| Materials | |
| Housing | stainless steel 1.4539 (904L) resistant to sea water |
| Seals | Viton |
| Cable jacket | PUR |
| Protection type | IP68 |
| Mechanical Strength | meets the mechanical shock tests of IEC 68-2-32 |
| EMC limits | CE conformity; EN 61000-4-2/3/4/5/6 and EN 61000-6-3 Class B are adhered to |