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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 />SOIIMOISTURE EQUIPMENT CORP. 15 ^® <br />P.O. Box 30025, Sonto Borboro, Colifornio 93105 USA / <br />Phone: (805) 964-3525 ~ Fox: (805) 683-2189 SOILMOISTURE <br />e-moil: solesQsoilmoisture.com ~ Web: http: //wwwsoilmoisture.com <br />