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<br />00J2G8 <br /> <br />Radio Reporting Rain Gauge <br /> <br />The Radio Reporting Rain Gauge, shown in Figure Z, <br />Standpipe Tower supporting structure that encloses all <br />the rain gauge and supports the transmitting antenna. <br />buried in the ground, in cement or compact soil, about <br /> <br />consists of a <br />components of <br />It is normally <br />two feet deep. <br /> <br />HANDAR 444B Tipping Bucket. At the top of this aluminum, non- <br />corrosive, ten foot structure is the HANDAR 444B Tipping Bucket. This <br />two foot h:gh unit includes a 1 mm tipping mechanism within a twelve <br />inch orifice catch basin and funnel. Two sets of screens are included <br />to prevent debris from entering the unit. <br /> <br />The tipping mechanism is made of a one-piece cast aluminum part <br />to prevent cracks from forming if freezing occurs in the bucket and to <br />prevent deterioration which might occur from soldered fabricated <br />parts. A magnet ic switch in the uni t provides a contact closure each <br />time 1 mm of water is collected in one of the two buckets. As one <br />bucket tips and empties, the other rises into position to continue <br />collecting any precipitation. <br /> <br />Adjustment screws are .made of non-coi:rosive, freeze resistant <br />nylon in order to easily re-calibrate the tipping mechanism. A self- <br />contained level bubble provides an easy means to level the mechanism <br />duting installation. Water discharge vents are screened to prevent <br />insect entry and baffled with metal plates to prevent wind gUSts from <br />disturbing the tipping mechanism. <br /> <br />HANDAR 585 Data Transmitter. At the bottom of the Standpipe <br />Tower is the HANDAR 585 Data Transmitter. It is located below ground <br />level within the water tight, corrosion proof aluminum container. It <br />includes all the electronic circuitry necessary to operate the Radio <br />Reporting Rain Gauge, including the radio transmitter and battery. <br />Cables connect the antenna and the tipping bucket to the Data Trans- <br />mitter. A rope sling is provided to install and remove the Data <br />Transmi r t er. <br /> <br />Rainfall data is collected by counting the number of 1 rom tipping <br />bucket contact closures. This accumulated value is then transmitted <br />to the Base Station, as the event occurs, such that data on rainfall <br />is always up- to-date. The Base Station is used to set the initial <br />value of rainfall and to convert it to units of inches. If any data <br />are not received for any reason, the ne:rt transmitted value from the <br />Data Transmitter provides the correct accumulator value to bting the <br />rainfall data up to date. <br /> <br />If there is no rainfall, no transmissions are made. However, to <br />indicate that tbe station is fully operational, transmissions are <br />automatically made twice a day, regardless of any sensor activity. <br /> <br />Switches on the Data Transmitter are used to set various parame- <br />ters for data collection prior to operation. The switches ace used to <br />set in the station's unique ID number, the number of events before <br />transmission for the digital (rainfall and water level) sensors, the <br />scan interval tiOle for analog sensa.", 300 or lZ00 baud rates, etc. <br /> <br />6 <br />