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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Reply to Robert Sullivan You may be able to employ special cables manufactured by PermAlert to detect leaks along pipelines. These cables (with permeable outer conductors) can be ordered with a range of permeable cores that control entry of various fluids into the dielectric between the inner and outer conductors. These cables are described in my book, GeoMeasurements by Pulsing TDR Cables and Probes, or on PermAlert's web site http://www.reliablefire.com/waterdetectionfolder/permalertleakdetection.html At 07:24 PM 7/22/2001 +0000, you wrote: > >Reply to robert sulivan >You don't state the composition of the pipe - but at those temperatures i >assume it is metal. That cuts out all capacitive methods, TDR and >microwaves - the only method i know of is the neutron method. Though the >standard NPS probe method will not work. I suggest you consider a method >which operates from outside the pipe with a single neutron source and a >series of detectors around the pipe. > >I have a contact who can make such devices (at a price) if you are >interested. > >cliff.hignett@soilwater.com.au > >owner-sowacs@aqua.ccwr.ac.za wrote: > > > > > I am looking for a probe of less than 6 1/2" that will measure the > > moisture inside a closed pipeline. The upper limit will be less than > > 350 degrees, the lower end more than 120 degrees. Do you have a product > > or know of some one that does? > > Thanks, > > > > Robert E. Sullivan > > Silicon International Ore > > P.O. Box 711628 > > Salt Lake City, Utah 84121 > > Off: 801-453-1681 > > FAX: 801-942-0665 > > > > [Bruce replies > > Robert, please explain your application in more detail - is this a closed > > pipe or an an access tube? (If it's closed - is the sensor to be placed > > permanently inside the pipe?). Are you wanting to measure the humidity in > > the pipe or the ore water content in the medium surrounding the pipe? Do > > the upper and lower limit you mention refer to degrees Farenheit?] > >-- >Cliff Hignett >Soil Water Solutions >45a Ormond Ave >Daw Park >South Australia 5041 >pH 61 (08) 8276 7706 >WWW.SOILWATER.COM.AU > > > > c-dowding@northwestern.edu Charles H Dowding (847) 491 4338 Professor of Civil Engineering (847) 491 4011 FAX Northwestern University http://www.civil.nwu.edu/people/dowding Evanston IL 60208 c-dowding@northwestern.edu