8
SYSTEM
3. SYSTEM
This section describes the HYDROS 21 Water Depth, Temperature, and EC (CTD) sensor.
3.1 SPECIFICATIONS
MEASUREMENT SPECIFICATIONS
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.
Temperature
Range
−11 to +49 °C
Resolution
0.1 °C
Accuracy
±1 °C
Water Depth
Range
0−10,000 mm
Resolution
1 mm
Accuracy
±0.5% of full scale at 20 °C
NOTE: Depth measurement accuracy assumes no abrupt temperature variations.
COMMUNICATION SPECIFICATIONS
Output
DDI serial or SDI-12 communication protocol
Data Logger Compatibility
METER ZL6 data loggers and any data acquisition system capable of 3.6- to 15.0-VDC
power and serial or SDI-12 communication
PHYSICAL SPECIFICATIONS
Dimensions
Length
9.0 cm (3.5 in)
Width
3.4 cm (1.3 in)
