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MAINTENANCE AND PRECAUTIONS <br /> There are no maintenance requirements for the Pressure-Vacuum <br /> Soil Water Sampler other than protecting the access tubes from <br /> damage.Tube ends should be covered or plugged to prevent debris <br /> from entering the tubes and later contaminating the Sampler. <br /> Freezing conditions will not damage the subsurface parts of the <br /> Samplers. The Samplers are normally left permanently in place <br /> all year round.Water may freeze in the sample line near the sur- <br /> face during saturated freezing conditions.Be sure all the water is <br /> removed from the sample line before clamping it for the next <br /> sample. <br /> Rewetting The Sampler If the soil suction exceeds 2 bars,the ceramic cup may need to be <br /> rewetted to obtain a sample.This is accomplished by pouring ap- <br /> proximately 250 ml of deionized water down the sample line(both <br /> the pressure-vacuum and the sample lines must be open). After <br /> waiting approximately one hour,pressurize the pressure-vacuum <br /> line to remove any excess water. A vacuum can be applied after <br /> the ceramic cup has been rewetted. If no sample is obtained after <br /> following the above rewetting procedure, the soil suction is prob- <br /> ably in excess of 85 cb. <br /> SOILMO1STURE EOUIPMENT CORP. 15 ^" <br /> P.O.Box 30025,Santo Barbaro, Colifomla 93105 USA <br /> Phone:(805)964-3525•Fox:(805)683-2189 SoaMO i�RE <br /> e-mail:soles@soilmoisture.com•Web:http://www.soilmoisture.com <br />