| 摘要 |
<p>A safety monitor to give an alarm when a parameter deviates from a preset value, especially for temperature control of rotating machinery or other equipment, using sensors in the form of resistors whose values vary according to the parameter being monitored so as to affect an oscillator. The oscillator is a fixed frequency one, and the sensors, connected in series, are arranged in parallel with an arm of greater resistance included in the oscillator feedback loop, and with tuned circuits resonant at the oscillator frequency so that when the resistance drops to a predetermined value the oscillator stops.</p> |
