The Driveway Sentry Mk.2 detects moving vehicles by sensing the small temporary changes in the Earth’s magnetic field caused by this motion. It detects the changes using a rectangular sensor loop which is buried under the driveway, or concealed with two opposite ends of the loop in the expansion gaps in the driveway itself.
Exit Delay: allows the system to be switched to non-sensing “sleep mode” for a period of about five minutes, to allow the owner’s vehicle to exit from the property without activating the Driveway Sentry. At the end of the Exit Delay, the system returns to its movement sensing mode.
Test Button: allows the system to be manually triggered into “movement detected” alarm mode without having to drive a vehicle over the remote sensing loop. This makes system adjustment easier and more convenient.
Piezo Buzzer: produces a high-pitched sound to attract your attention when movement is detected. This sound can be disabled if you prefer the system to respond silently.
Relay Contacts: includes an SPST relay with mains-rated contacts. The relay is activated when the system detects movement, allowing the unit to be connected to control mains lighting or other equipment such as a high-powered siren.
Alarm Duration Control: allows the duration of the system’s “movement detected” alarm mode to be adjusted between a minimum of two seconds and a maximum of about 25 seconds.
Sensitivity Adjustment: allows the sensitivity of the Driveway Sentry to be adjusted over a wide range, so it can be set for reliable vehicle detection without being too sensitive and susceptible to false alarms.
Low Power Consumption: unit operates from 12V DC power (normally a plugpack), with a low current drain: <25mA in Exit Delay mode (<300mW), <15mA in armed mode (<180mW) and <100mA in alarm (movement detected) mode (<1.2W). This means that the system can also be operated from a 12V SLA battery and/or solar power in rural and other remote situations.