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Summary of Contents for METER HYDROS 21 GEN 1
- Page 1 HYDROS 21 GEN 1...
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Page 2: Table Of Contents
2. Operation ....................2 2.1 Installation ....................2 2.2 Connecting ....................4 2.2.1 Connect to METER Data Logger ............5 2.2.2 Connect to a Non-METER Data Logger ..........5 2.3 Communication ..................7 3. System ......................8 3.1 Specifications .................... 8 3.2 Components .................... -
Page 4: Introduction
1. INTRODUCTION Thank you for choosing the HYDROS 21 Water Depth, Temperature, and Electrical Conductivity (EC) sensor from METER Group. The HYDROS 21 (CTD) is designed for groundwater monitoring wells or piezometers, surface water monitoring, and wetland monitoring. The sensor cable is vented to remove the effects of barometric pressure changes. -
Page 5: Operation
PRECAUTIONS METER sensors are built to the highest standards, but misuse, improper protection, or improper installation may damage the sensor and possibly void the manufacturer’s warranty. Before integrating HYDROS 21 into a system, make sure to follow the recommended installation instructions and have the proper protections in place to safeguard sensors from damage. - Page 6 HYDROS 21 Table 1 Installation (continued) Suspend HYDROS 21 in Well Ensure the well has been properly installed, consulting additional resources as necessary (e.g., Sprecher, 2008). The well must be 3.5 cm in diameter or larger. NOTE: Well design depends on the desired measurement, such as groundwater flow, quality, level, or pressure head.
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Page 7: Connecting
For more instructions on connecting to data loggers, refer to Section 2.2. 2.2 CONNECTING The HYDROS 21 works seamlessly with METER data loggers. The HYDROS 21 can also be used with other data loggers, such as those from Campbell Scientific, Inc. For extensive directions on how to integrate the sensors into third-party loggers, refer to the HYDROS 21 Integrator... -
Page 8: Connect To Meter Data Logger
HYDROS 21. METER data loggers will automatically recognize HYDROS 21 sensors. Set the measurement interval. METER data loggers measure the HYDROS 21 every minute and return the average of the 1-min data across the chosen measurement interval. HYDROS 21 data can be downloaded from METER data loggers using either ZENTRA Utility or ZENTRA Cloud. - Page 9 Scientific data loggers, power the sensor from a switched 12-V port or a 12-V port if using a multiplexer. If the HYDROS 21 cable has a standard stereo plug connector and needs to be connected to a non-METER data logger, use one of the following two options. Option 1 Clip off the stereo plug connector on the sensor cable.
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Page 10: Communication
Detailed information can also be found in the application note Setting SDI-12 addresses on METER digital sensors using Campbell Scientific data loggers and LoggerNet. When using the sensor as part of an SDI-12 bus, excite the sensors continuously to avoid... -
Page 11: System
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) - Page 12 HYDROS 21 Operating Temperature Range Minimum 0 °C Maximum 50 °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 mm Connector Types 3.5-mm stereo plug connector or stripped and tinned wires ELECTRICAL AND TIMING CHARACTERISTICS...
- Page 13 SYSTEM Power Line Slew Rate Minimum 1.0 V/ms Typical Maximum Current Drain (during measurement) Minimum 0.5 mA Typical 0.5 mA Maximum 1.0 mA Current Drain (while asleep) Minimum Typical 0.3 mA Maximum Power Up Time (DDI serial) Minimum Typical 475 ms Maximum 500 ms Power Up Time (SDI-12)
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Page 14: Components
HYDROS 21 3.2 COMPONENTS The HYDROS 21 sensor monitors water level, temperature, and EC in both ground and surface water. The HYDROS 21 uses a vented ceramic peizoresistive differential pressure transducer to measure the pressure from the water column to determine water depth. A thermistor in thermal contact with the probe provides water temperature, while the stainless steel screws on the surface of the sensor form a four-electrode array to measure EC. -
Page 15: Temperature
SYSTEM Keep the vent open to the same atmospheric pressure that applies to the water and out of the water. Since the cable conducts reference air between the sensor and the atmosphere, it is extremely important to protect the cable from any damage that allows water to enter. 3.3.2 TEMPERATURE A thermistor near the EC sensor senses the temperature of the water. -
Page 16: Service
Troubleshooting solutions and customer support contact information are also provided. 4.1 CALIBRATION METER factory calibrates the water depth and EC sensors to values stored internally in flash memory. The depth sensor is calibrated to known depths of water, and the EC sensor is calibrated using potassium chloride (KCl) solutions of known concentrations. -
Page 17: Electrical Conductivity Sensor
SERVICE If the sediment does not all come off with running water, soak the sensor in a mixture of water and dish soap for 1 h. Repeat step 1. 4.2.2 ELECTRICAL CONDUCTIVITY SENSOR The four-electrode conductivity measurement is less sensitive to sensor fouling than a two-electrode sensor, but contamination of the electrodes can still affect the measurement. -
Page 18: Customer Support
NOTE: For products purchased through a distributor, please contact the distributor directly for assistance. 4.5 TERMS AND CONDITIONS By using METER instruments and documentation, you agree to abide by the METER Group, Inc. USA Terms and Conditions. Please refer to metergroup.com/terms-conditions... -
Page 19: References
REFERENCES REFERENCES Sprecher, S.W. 2008. Installing Monitoring Wells in Soils (Version 1.0). National Soil Survey Center, Natural Resources Conservation Service, USDA, Lincoln, NE. -
Page 20: Index
8, 12 thermistor 1, 11 terms and conditions 15 vent 11 theory connecting electrical conductivity 12 METER data logger 5 temperature 12 non-METER logger 5–6 water depth 11 connector types 9 troubleshooting 14 customer support 15 water depth 8, 11 electrical conductivity 8, 12 wiring 6–7... - Page 21 14570-01 1.8.2021 METER Group, Inc. USA 2365 NE Hopkins Court Pullman, WA 99163 T: +1.509.332.2756 F: +1.509.332.5158 E: info@metergroup.com W: metergroup.com METER Group AG Mettlacher Straße 8, 81379 München T: +49 89 1266520 F: +49 89 12665220 E: info.europe@metergroup.com W: metergroup.de...
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