FIELD: safety engineering. SUBSTANCE: signal across storage capacitor 13 connected through resistor 9 to output of NOT gate 7 reaches level triggering warning unit after several charge pulses following at supply mains frequency and duration determined by one-shot multivibrator 6. So, device operates under action of industrial-frequency electric fields only and is immune to static electricity charges reaching antenna due to rubbing against clothes. EFFECT: improved reliability in operation. 2 cl, 2 dwg
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Authors
Dates
1995-08-27—Published
1990-09-25—Filed