Laserfiche WebLink
<br />Oil0275 <br /> <br />-\, <br /> <br />\ <br />Stat ion is sii;.own in Fi gur e 5. <br />shaft encoderil the following <br />\ <br /> <br /> <br />\ <br /> <br /> <br /> <br /> <br />such as water pressure, water qua~Y, etc. <br />'-... <br />The wind speed, wind direction, relative humidity, and-.air <br />temperature sensors are installed on a cross-arm attached to the ma:in <br />mast of the Standpipe Tower as shown in Figure 5. The barometric <br />pressure sensor is mounted inside the standpipe tower, below th~ <br />tipping bucket. . \ <br />\ <br />All the HANDAR weather sensors are interfaced to the Data Trans- <br />mitter through the Met Interface Board. Two of these boards can be <br />ins taIled .to interface to a total of sixteen analog sensors and one <br />wind speed sensor, <br /> <br />Radio Reporting Weather Station <br /> <br />A complete Radio Reporting Weather <br />In addition to a tipping bucket and/or <br />sensors can be added to the station: <br /> <br />Wind Speed <br />Wind Direction <br />Air Temperature <br />Relative Humidity and <br />Barometric Pressure <br />plus... <br />Other analog sensors <br /> <br />Ai r Temper ature <br /> <br />HANDAR's 430A Wind Speed and 431A Wind Direction sensors have <br />been fully tested by the National Weather Service's Testing and Evalu- <br />ation Center in Sterling, Virginia. <br /> <br />Analog sensots such as wind direction, air temperature, relative <br />humidity, and barometric pressure transmit on preset time intervals. <br />These intervals are set by switches in the 585B Data Transmitter. The <br />intervals are: 3 3/4, 11 1/4, 15, 30 minutes, 1, Z, 3, 6, and 9 hours. <br /> <br />In addition, a swit.ch setting enables the analog sensor data .to <br />be be transmitted any time a digital event, a change in rainfall or in <br />water level, occurs. Other switch settings prohibit analog sensor <br />transmission unless the value has changed by certain preset per- <br />centages. This feature reduces unnecessary RF transmissions so that <br />only significant changes ate transmitted. <br /> <br />Wind speed information IS ,transmitted each time the amount of <br />wind run exceeds a certain preset value. Wind speed is then calcu- <br />lated from the time interval between the transmissions. Values can be <br />preset at 1, Z, 4, or 8 kilometers. Base station software converts <br />these units into miles per hour or any other units desired. <br /> <br />lZ <br />