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229-L: Water Matric Potential Sensor Page 1 of 1 <br /> CAMPB C5United____States Choose your site Search� SCIENTIFIC, IJ�C.'x � _ <br /> Nome Solutions Products Systems - /kb <br /> �29-L <br /> ater Matric Potential Sensor <br /> Resources <br /> The 229-L Water Matric Potential Sensor measures soil water Add to Qulck Quote <br /> potential from 0.1 to 10 bars. The sensor consists of a heating ----- - --— (2) Ask our Expert <br /> element and thermocouple emplaced in epoxy in a hypodermic <br /> needle, which is encased in a porous ceramic matrix. EA- <br /> Qs-To calculate soil water matric potential, a Current Excitation Module applies a 50 mA -D-ow"I—ads <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 Documents <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. Brochure <br /> Features <br /> Related Products <br /> • Uses heat dissipation method for soil water <br /> matric potential measurement CE4 4-Channel Excitation._ <br /> • Measurement time is 30 seconds CE8_8_Channel Excitt I!Qn_. <br /> • CE8 8-Channel or CE4 4-Channel 50 mA ----- - <br /> Constant Current Source used with heating <br /> • element for heat source <br /> Product in Action <br /> • Requires individual calibration <br /> ��- Montana.-Acid Rock Draina <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 Map Privacy Downloads Contact.Us Q_Copyright_2000 2005_Ca_mpbell_ScientificLInc. <br /> • <br /> http://www.campbellsci.com/229-1 7/14/2005 <br />