Introduction to Sensor
The HYDROS 21 is a compact, durable, and easy-to-use sensor designed to measure water depth, temperature, and electrical conductivity. Its low-maintenance and cost-effective design makes it ideal for long-term water monitoring. With remote data access in real time, the HYDROS 21 provides reliable water information for research, environmental monitoring, agriculture, and water resource management.
Specifications
Specifications
Measurement Specifications
| Parameter | Specifications |
|---|---|
| Water Depth | Range: 0 – 10,000 mm Resolution: 1 mm Accuracy: ±0.25% of full scale at 20 °C NOTE: Depth measurement accuracy assumes no abrupt temperature variations. |
| Temperature | Range: -40 to +60 °C Resolution: 0.10 °C Accuracy: ±1.0 °C from −40 to 0 °C±0.5 °C from 0 to +60 °C NOTE: The pressure transducer may be damaged or destroyed if frozen in ice. Remove the sensor if the water temperature could drop below 0°C (32 °F). |
| Bulk Electrical Conductivity (EC) | Range: 0 – 120 dS/m Resolution: 0.001 dS/m Accuracy: ±0.01 dS/m or ±10%, whichever is greater NOTE: The EC measurement is corrected to a standard temperature of 25°C. |
Communication Specifications
| Parameter | Specifications |
|---|---|
| Output | DDI serial or SDI-12 communications protocol |
| Data Logger Compatibility | METER ZL6 data loggers and any data acquisition system capable of 4.0- to 15.0-VDC power and serial or SDI-12 communications |
Physical Specifications
| Parameter | Specifications |
|---|---|
| Dimensions | Diameter: 3.4 cm (1.3 in) Length: 9.0 cm (3.5 in) |
| Operating Temperature Range | Minimum: 0 °C Maximum: 60 °C NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance. |
| Cable Length | 10 m (standard) 20 m 40 m (maximum cable length) |
| Cable Diameter | 6.00 ±0.25 mm (0.240 ±0.010 in) with minimum jacket of 0.80 mm (0.031 in) |
| Connector Types | Stereo plug connector or stripped and tinned wires |
| Stereo Plug Connector Diameter | 3.5 mm |
| Conductor Gauge | 20-AWG signal and power / 21-AWG ground wire |
Electrical and Timing Characteristics
| Parameter | Specifications |
|---|---|
| Supply Voltage Power to Ground | Minimum: 4.0 V Typical: NA Maximum: 15.0 V |
| Digital Input Voltage (Logic High) | Minimum: 2.8 V Typical: 3.6 V Maximum: 5.0 V |
| Digital Input Voltage (Logic Low) | Minimum: -0.3 V Typical: 0.0 V Maximum: 0.8 V |
| Digital Output Voltage (Logic Low) | Minimum: NA Typical: 3.6 V Maximum: NA |
| Power Line Slew Rate | Minimum: 1.0 V/ms Typical: NA Maximum: NA |
| Current Drain (During Measurement) | Minimum: 2.5 mA Typical: 3.5 mA Maximum: 8.0 mA |
| Current Drain (While Asleep) | Minimum: NA Typical: 0.35 mA Maximum: NA |
| Power Up Time (DDI Serial) | Minimum: 52 ms Typical: NA Maximum: 100 ms |
| Power Up Time (SDI-12) | Minimum: NA Typical: 700 ms Maximum: 750 ms |
| Power Up Time (SDI-12, DDI Serial Disabled) | Minimum: NA Typical: 175 ms Maximum: 200 ms |
| Measurement Duration | Minimum: NA Typical: 450 ms Maximum: 600 ms |
Other
| Parameter | Specifications |
|---|---|
| Compliance | EM ISO/IEC 17050:2010 (CE Mark) |
| Prop 65 warning | Prop 65 warning |
| GSA | View GSA details |
Features
Applications