WATER-LEVEL PROBE

AN INSTRUMENT WAS DESIGNED TO INDICATE ANY CHANGE IN THE UNDERGROUND WATER LEVEL. THE DESIGN APPROACH WAS TO USE THE CONDUCTIVITY OF THE WATER AS THE SENSING MECHANISM, SINCE ONLY A SMALL AMOUNT OF CURRENT FLOW THROUGH THE WATER IS REQUIRED TO GENERATE A USEABLE SIGNAL. AFTER SEVERAL WEEKS OF USE, THE ALUMINUM ELECTRODES WERE BADLY CORRODED. A SECOND PROBE WITH A PIECE OF RULON C MATERIAL ALSO FAILED. IT WAS THEN DECIDED TO DEVISE A PROBE THAT DID NOT DEPEND ON THE CONDUCTIVITY OF WATER, INSTEAD A FLOAT-OPERATED SINGLE- POLE DOUBLE-THROW SWITCH WAS DEVELOPED. A STAINLESS STEEL CONDUCTIVE PROBE WITH LONG POINTED ELECTRODES WAS ALSO DEVELOPED BECAUSE BOTH TYPES OF PROBES LOOKED GOOD. THREE MODELS OF THE INSTRUMENT WERE CONSTRUCTED TO TEST THESE PROBES.

• Authors:
  • Mcgary, K H
  • Wilhelmsen, M
  • Boren, P
• Publication Date: 1968-6

Media Info

• Serial:
  • Journal Hydrology /Neth/

Subject/Index Terms

• TRT Terms: Aluminum; Detection and identification; Detectors; Electrodes; Floating structures; Groundwater; Machines; Probes (Measuring devices); Sensors; Stainless steel; Water table
• Uncontrolled Terms: Switches
• Old TRIS Terms: Floats; Mechanisms; Probing
• Subject Areas: Bridges and other structures; Geotechnology; Highways;

Filing Info

• Accession Number: 00229531
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 15 2004 1:50AM