HYDROS 21
Tech Specs
TECHNICAL SPECIFICATIONS
Measurement Specifications
Water Depth
Range:Â 0 – 10,000 mm
Resolution:Â 1 mm
Accuracy: ±0.25% of full scale at 20 °C
NOTE:Â Depth measurement accuracy assumes no abrupt temperature variations.
Temperature
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:Â 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
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
Dimensions
Diameter:Â 3.4 cm (1.3 in)
Length:Â 9.0 cm (3.5 in)
Operating Temperature Range
Minimum: 0 °C
Maximum: 60 °C
NOTE:Â 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)
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:Â 4.0 V
Typical:Â NA
Maximum:Â 15.0 V
Digital Input Voltage (Logic High)
Minimum:Â 2.8 V
Typical:Â 3.6 V
Maximum:Â 5.0 V
Digital Input Voltage (Logic Low)
Minimum:Â -0.3 V
Typical:Â 0.0 V
Maximum:Â 0.8 V
Digital Output Voltage (Logic Low)
Minimum:Â NA
Typical:Â 3.6 V
Maximum:Â NA
Power Line Slew Rate
Minimum:Â 1.0 V/ms
Typical:Â NA
Maximum:Â NA
Current Drain (During Measurement)
Minimum:Â 2.5 mA
Typical:Â 3.5 mA
Maximum:Â 8.0 mA
Current Drain (While Asleep)
Minimum:Â NA
Typical:Â 0.35 mA
Maximum:Â NA
Power Up Time (DDI Serial)
Minimum:Â 52 ms
Typical:Â NA
Maximum:Â 100 ms
Power Up Time (SDI-12)
Minimum:Â NA
Typical:Â 700 ms
Maximum:Â 750 ms
Power Up Time (SDI-12, DDI Serial Disabled)
Minimum:Â NA
Typical:Â 175 ms
Maximum:Â 200 ms
Measurement Duration
Minimum:Â NA
Typical:Â 450 ms
Maximum:Â 600 ms
Other
Compliance
EM ISO/IEC 17050:2010 (CE Mark)
GSA
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