(57) A position-disturbance sensor for sensing any position-disturbance or "upset" of
the sensor from a predetermined rest position. The sensor (1) includes a housing (2)
with an easily movable metal ball (3) or the like, which, upon any upset of the sensor,
makes contact with two of a plurality of contact pins (I-III) fixedly placed in the
housing for connecting or disconnecting a supply voltage (U1) to an electronic circuit
(5). The circuit has a first capacitor (C2) capable of, at each connection of the
supply voltage, receive a charge addition, the voltage across the capacitor (C2) reaching
a predetermined level only upon a certain number of connections of the supply voltage,
in order to indicate an upset of the sensor. The circuit has also a second capacitor
(C1) being incorporated in a RC-circuit (R1, C1) which is so dimensioned that the
second capacitor (C1) will not substantially be discharged during rapid contact changes
of the ball (3), e g when the sensor is upset as a result of an explosion at the vicinity
of the sensor.
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