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0 reviews | Model: HOBO by Onset S-RGD-M002
Davis (0.2mm) Rain Gauge Smart Sensor
Your Price: $199.00
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Davis® Rain Gauge Smart Sensors are compatible with all HOBO weather station loggers, HOBOware, and HOBOlink. They offer the same ease-of-use as existing Onset Smart Sensors, providing cost-effective HOBO weather stations for projects on a tight budget. The sensors feature a plug-in modular connector for easy installation, and all configuration parameters are stored in the sensor and automatically communicated to the logger, eliminating the need for programming or extensive setup. In what environment does this sensor operate? This sensor operates in an outdoor environment. What measurements does this sensor support? The S-RGC-M002 sensor supports the following measurement: Rainfall Operation Rain enters the collector cone, passes through a debris-filtering screen, and collects in one chamber of the tipping mechanism. The tipping spoon tips when it has collected an amount of water equal to the increment in which the sensor measures (0.2 mm or 0.01 inch). As the spoon tips, it causes a switch closure and brings the second tipping spoon chamber into position. The rain water drains out through the screened drains in the base of the collector. Components The smart sensor includes the components shown on the diagrams on the next page. The smart sensor includes a hardware kit with the items most commonly needed for installation. The items you use from the kit depend on where you install the sensor. You may need to adapt or purchase additional hardware to fit your individual requirements.
Mounting Considerations Use the following guidelines to determine the best location for installing the sensor.
With the supplied U-bolt, the rain collector can be mounted on a pole having an outside diameter ranging from 32 to 44 mm (1-1/4 to 1-3/4 inch). A larger U-bolt (not supplied) can be used to mount to a pole with a maximum outside diameter of 64 mm (2-1/2 inch). To mount on a smaller pole, obtain a U-bolt that fits the base openings but has a shorter threaded section. If the included U- bolt is used with a smaller pole, the bolt will interfere with the rain collector cone. Use the built-in bubble level to ensure the sensor is level.
Connecting the Sensor to a Station To connect the sensor to a station, stop the station from logging and insert the smart sensor’s modular jack into an available smart sensor port on the station. See the station manual for details on operating stations with smart sensors. Maintenance For greatest accuracy, you should thoroughly clean the smart sensor at least once or twice a year.
Field Calibration The sensor is calibrated at the factory so the spoons tip (and record rainfall) for each 0.2 mm or 0.01 inch of rain. To adjust the calibration slightly, use a 5 mm (3/16 inch) wrench to rotate the adjustment screws located underneath the tipping spoons (see diagram in Components). Do not touch the reed switch. The adjustment guide embossed in the platform shows how far you must rotate both screws in turn to effect a 1% and a 2% change.
Moving the screws in the positive (+) direction causes the spoons to tip more times (i.e. give a larger count) for a given amount of water. Modify both adjustment screws by the same amount. To check the accuracy of the sensor, compare it with a tube type rain gauge. Use a rain gauge with an aperture of at least 10.2 cm (4 inches). Any smaller and the readings obtained may not be accurate. Place the tube type rain gauge directly next to the smart sensor. Compare the totals on three storms to determine whether your rain collector needs calibration and by how much. Adjust the screws to fine-tune the reading for the next three storms if necessary.
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