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var s="KTI Technologies Sentry Model SN-3000-AS is an electronic presence sensing device developed to comply with O.S.H.A. safety standards 1910.217 and 1910.212.  The Sentry is designed to protect personnel from accidental injuries due to contact with moving machinery or other hazardous conditions (pinch points) frequently encountered in an industrial environment. \n\nIn operation, if a workers hand enters the protected area, a stop signal is sent within 15 milli-seconds to the emergency stop circuit of the machine, thus preventing injury.\n\nThe operating principle of the Sentry Model SN-3000-AS is based upon the capacitance existing between all bodies and earth ground.  The magnitude of capacitance is directly proportional to the area of the body and its distance between another body of ground, thus by increasing the area of the body, it increases the capacitance.  Since the capacitance can be measured and controlled very accurately through modern electronic techniques, the basis for a control system capable of sensing variations around a hazardous area is established.\n\nThe system employs a control unit which provides low frequency (66khz) low energy radio waves that cannot be seen, heard, or felt, to antenna.\n\nThe low frequency, low energy signal which is provided to the antenna is insufficient to affect other devices such as welders, NC and CNC controlled machines or any communication equipment.\n\nThe antenna which can consist of 3/4” thin wall conduit (EMT) or any conductive material such as copper or galvanized pipe is configured around the hazardous area to be protected.  By incorporating the antenna into a stable electronic balanced bridge circuit, any additional object entering the protected area bounded by the antenna can be detected by the resulting change in capacitance.  The standard Sentry Model SN-3000-AS is capable of antenna length of 75 linear feet and can be increased to 150 linear feet to accommodate for virtually any configuration to provide effective protection to hazardous area.\n";
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