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New Tape For Ground Water Measurements |
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| Authors: | Paul J Sanders |
| Institution: | Paul J. Sanders (Oil Recovery Systems, 299 Second Ave., Needham Heights, MA02194) is a founder and the president of Oil Recovery Systems Inc. and its subsidiary Groundwater Technology. He has developed the oleophilic-hydrophobic screen which is the key element in the Scavenger®. Sanders has developed controls for water pumps that prevent these pumps from pumping hydrocarbons in hydrocarbon recovery wells;and controls for hydrocarbon pumps to permit them to pump only hydrocarbons. He has degrees from M.I.T. and Harvard and has worked for various electronics firms in the Boston area. |
| Abstract: | A composite tape has been developed which can be the link to various sensing devices for measuring ground water parameters. The tape consists of a standard steel engineering tape with two conductors at the edges of the tape, similar to a TV antenna wire. The tape coating is clear Tefzel®, which has outstanding chemical and physical resistance. At the bottom end of the tape is a probe which can sense either water level by conductivity, a layer of organic liquid by an optical device, temperature by advanced semiconductor temperature transducers, pH, dissolved oxygen, absolute conductivity, or any other measurement that can be made with a small in situ probe. The steel tape itself provides one of three conductors and, because of its thin, flat shape, provides an excellent ground plane for electronic noise reduction. A multiplexing circuit commonly used in the electronics industry is placed inside the probe tip housing and routinely allows up to 16 signals to be transmitted to the hub at ground level. Most probes can be powered with a common 9V rechargeable battery. Signals are given either by low power-consuming light-emitting diodes (LEDs) ～ 5 milliamperes (mA), piezo-audible alarms ～ 3mA, or liquid crystal displays ～ l-2mA This configuration allows for extremely accurate depth profiles of the desired parameters. |
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