Capacitance Proximity Sensor (CPS) detects penetration through openings what are they? (grill bars/shutters) Also used on safes.

Capacitance Proximity Sensor (CPS) detects penetration through openings what are they? (grill bars/shutters) Also used on safes.

• A. Capacitance proximity sensor detects sound signals
• B. Capacitance proximity sensor detects light changes
• C. Capacitance proximity sensor detects openings that are not covered by grills
• D. Capacitance proximity sensor detects penetration through openings that are covered by grill bars or metal shutters

Answer: (D)

Capacitance proximity sensors detect changes in the electric field caused by a conductive object entering the sensing region. When an opening in a barrier is covered by grill bars or metal shutters, any attempt to reach through that opening alters the nearby dielectric environment and the sensor’s capacitance. That change signals a penetration attempt even though the opening is guarded, which is why this type of sensor is used on safes and guarded openings. This isn’t about sound or light, which is why those options don’t fit. And an opening that isn’t guarded by grill bars or shutters doesn’t provide the same defined sensing path the CPS monitors, so it isn’t how this sensor is meant to detect penetration.

Capacitance proximity sensors detect changes in the electric field caused by a conductive object entering the sensing region. When an opening in a barrier is covered by grill bars or metal shutters, any attempt to reach through that opening alters the nearby dielectric environment and the sensor’s capacitance. That change signals a penetration attempt even though the opening is guarded, which is why this type of sensor is used on safes and guarded openings.

This isn’t about sound or light, which is why those options don’t fit. And an opening that isn’t guarded by grill bars or shutters doesn’t provide the same defined sensing path the CPS monitors, so it isn’t how this sensor is meant to detect penetration.