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Ordering Information <br />229-L Water Matric Potential Sensor. Enter lead length, in feet, after L. Requires either a CE4 or CE8. <br />CE4 4 -Channel Excitation Current Module; requires a 12 Vdc source. <br />CE8 8 -Channel Excitation Current Module; requires a 12 Vdc source. <br />Specifications <br />229 <br />Measurement range: -10 to -2500 kPa <br />Measurement time: 30 seconds typical <br />Thermocouple type: copper/constantan (type T) <br />Heater resistance: -34 ohms <br />Resolution: —1 kPa at matric potentials greater than -100 kPa <br />Dimensions: 0.6' (1.5 cm) diameter, 2.4" (6.0 cm) length <br />Weight: 0.35 oz (10 g), cable weighs —0.25 oz/ft (23 g/m) <br />CE4/CE8 <br />Output: 50 mA ±1 mA per channel, regulated <br />Output channels: 4 (CE4), 8 (CE8) <br />Current drain (while active): 25 mA+ (50 mA)-(the number of 229s connected to the CE4 or CE8 output channels) <br />Dimensions: CE4: 4.5" (11.5 cm) x 2.1" (5.4 cm) x 1.1" (2.7 cm) <br />CE8: 6.5" (16.5 cm) x 2.1" (5.4 cm) x 1.1" (2.7 cm) <br />Weight: CE4: 4.6 oz (131 g) <br />CE8: 6.5 oz (184 g) <br />815 W. 1800 N. Logan, Utah 84321-1784 [ USA [ phone [435] 753-2342 [ www.campbellsci.com Copyright ®2003,2007 <br />Australia [ Brazil [ Canada [ England [ France [ Germany [ South Africa [ Spain [ USA [headquarters] Campbell Scientific, Inc. <br />Printed June 2007 <br />11 <br />