Tech Specs

HYDROS 21 Tech Specs


Measurement 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.
Range: -40 to +60 °C
Resolution: 0.10 °C
Accuracy: ±1.00 °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
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
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
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
EM ISO/IEC 17050:2010 (CE Mark)

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