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229-L: Water Matric Potential Sensor <br />United States ; Choose your site <br />r� :+ rrouuc�5 aysas <br />229®L <br />Water Matric Potential Sensor <br />The 229-L Water Matric Potential Sensor measures soil water <br />Add to Quick Quote <br />potential from 0.1 to 10 bars. The sensor consists of a heating <br />element and thermocouple emplaced in epoxy in a hypodermic <br />needle, which is encased in a porous ceramic matrix. <br />To calculate soil water matric potential, a Current Excitation Module applies a 50 mA <br />current to the 229's heating element, and the 229 thermocouple measures the <br />temperature rise. The magnitude of the temperature rise varies according to the <br />amount of water in the porous ceramic matrix, which changes as the surrounding soil <br />wets and dries. <br />Soil water matric potential is determined by applying a second -order polynomial <br />equation to the temperature rise. Users must individually calibrate each of their 229 <br />sensors in the soil type in which the sensors will reside. <br />Features <br />• Uses heat dissipation method for soil water <br />matric potential measurement <br />• Measurement time is 30 seconds <br />• CE8 8 -Channel or CE4 4-Channei 50 mA <br />Constant Current Source used with heating <br />element for heat 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 <br />sensor <br />Weight: 0.35 oz (10 g) <br />Home Site Man Privacy Downloads Contact Us <br />http://www.campbellsei.com/229-1 <br />Page 1 of 1 <br />Search <br />Resources <br />Ask Our Expert <br />? FAOS <br />�} Downloads. <br />Documents <br />;< <br />Brochure <br />Related Products <br />CE4 4 -Channel Excitation... <br />CE8 8 -Channel Excitation...., <br />Product in Action <br />Montana: Acid Rock Draina <br />&c—C-Qgyright 2000. 2005 Campbell Scientific, Inc.. <br />7/14/2005 <br />