The OTT CTD is an integrated sensor and datalogger for measurement of water level, temperature, and conductivity in groundwater and surface water applications.
It features a robust ceramic measuring cell for long term accuracy and has outputs for salinity and total dissolved solids (TDS). Its built in datalogger manages and stores all measurements at user-programmable intervals.
Specifications
Technical Attributes
| *Parameters Measured | Water Level Pressure Conductivity Temperature |
| Battery Type | Alkaline |
| Body material | ABS, POM, 904 L (DIN 1.4539) |
| Conductivity Accuracy | Measuring Range 0.001 – 2.000 mS/cm: ±0.5 % of measurement value; min ±0.0025 mS/in (±0.001 mS/cm) |
| Conductivity Accuracy 2 | Measuring Range 0.1 – 100 mS/cm: ±1.5 % of measurement value; min ±0.025 mS/in (±0.01 mS/cm) |
| Conductivity resolution | Measuring Range 0.001 – 2.000 mS/cm: 0.0025 mS/in (0.001 mS/cm) Measuring Range 0.1 – 100 mS/cm: 0.025 mS/in (0.01 mS/cm) |
| Interface | Infrared (IrDA) |
| Level Accuracy | ±0.05 % FS (linearity and hysteresis) |
| Lifetime at 1h Reading Intervals | NA, min. 1.5 years (high quality battery types) |
| Measuring Range | 0 – 13 ft (0 – 4 m) |
| Measuring Range Conductivity | 0.0025 – 5080 mS/in (0.001 – 2000 mS/cm ); 0.25 – 254 mS/in (0.1 – 100 mS/cm) |
| Memory | 4 MB non-volatile |
| Number of Measured Values | 500000 |
| Operating Temperature Range | -13 – +158 °F (-25 – +70 °C) (ice-free) |
| Power Supply | 3 x 1.5 V LR6-cells Alkaline |
| Protection Class | Communication Unit: IP 67 Sensor: IP 68 |
| Reading Interval | 1 s – 24 h |
| Resolution | 0.01 ft; 0.001 psi (0.001 m; 0.1 cm; 0.1 mbar) |
| Storage Interval | 1 s – 24 h |
| System Length | 5 – 656 ft (1.5-200 m) |
| Temperature Accuracy | ±0.9 °F (±0.5 °C) |
| Temperature Compensation | +23 – +113 °F (-5 – +45 °C) (ice-free) |
| Temperature Resolution | 0.01 °F (0.01 °C) |
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