Laserfiche WebLink
1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />229-L: Water Matric Potential Sensor <br />United Statesaij Choose your site <br />Home Solutions <br />229-L <br />Water Matric Potential Sensor <br />The 229-L Water Matric Potential Sensor measures soil water potential from 0.1 to Add to Qulek Quote <br />bars. The sensor consists of a heating element and thermocouple emplaced in <br />epoxy in a hypodermic needle, which is encased in a porous ceramic matrix. <br />To calculate soil water matric potential, a Current Excitation Module applies a 50 mA current to the 229's <br />heating element, and the 229 thermocouple measures the temperature rise. The magnitude of the <br />temperature rise varies according to the amount of water in the porous ceramic matrix, which changes as <br />the surrounding soil wets and dries. <br />Soil water matric potential is determined by applying a second -order polynomial equation to the <br />temperature rise. Users must individually calibrate each of their 229 sensors in the soil type in which the <br />sensors will reside. <br />Features <br />• Uses heat dissipation method for soil water matric <br />potential measurement <br />• Measurement time is 30 seconds <br />• CE8 8 -Channel or CE4 4 -Channel 50 mA Constant <br />Current Source used with heating element for heat <br />source <br />• Requires individual calibration <br />Specifications <br />• Measurement range: 0.1 to 10 bars - <br />• Measurement time: 30 seconds <br />• Thermocouple type: copper/constantan <br />• Length: 2.4" (60 mm) length of entire sensor <br />Weight: 0.35 oz (10 g) <br />http://www.campbellsci.com/229-1 <br />Page 1 of 1 <br />Sean <br />Products <br />Resoui <br />(�? Ask Our Exoer <br />?? EAQs <br />Downloads <br />Docum <br />s <br />s <br />S <br />Brochure MM <br />Related P <br />CE4 4 -Channel Exci <br />CE8 8 -Channel Exci <br />Product it <br />Montana: Acid Rock <br />10/5/2007 <br />