Due to its high sensitivity and good stability, the Body Detector may be attached to a wide variety of metal objects in the process sensitizing the entire object concerned. Although in theory the Body Detector is dependent on the electric field which surrounds the human body, in effect it acts as though an invisible field were created around the object concerned similar to the "invisible" defence shields seen in the latest star wars movie.
From a practical point of view, the sensor may include any object from the size of a pin to about 70kg in weight (e.g lightweight motor-scooter). However the greater the weight of the metal sensor, the less the sensitivity of the circuit. the more critical the tuning and the more it becomes susceptible to temperature variations especially.
If attached to lighter metal objects such a sheet of tin-foil, the Body Detector may be turned to detect a person's presence up to 80cm away. At several centimeters distance, the circuit is sufficiently stable to avoid spurious triggering over a wide temperature range. In one test, bicycle was moved from shade to full sun and back into the shade during the course of a day, maintaining reliable triggering. In another test, a 300mm square of tin-foil was tested successfully without the need for readjustment between 10degree circus and 0 degree circus and would in fact have exceeded this. This compares very favorably with variations in room temperature which typically amount to no more than 10 degree circus.
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