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Theft warnings
Page 149
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All levels of commercial vehicle security are catered for with two new alarms from Digitation. The basic alarm is suitable for protection of vans and where the value of goods is not high, but for high value loads a "Bullion Van" version is available to give extra security features.
To avoid the problem of false alarms, the basic model is designed to sense the opening of doors only and not to respond to vibration or rocking of the vehicle. This is done with high-grade door switches specially chosen for robustness and reliability. The alarm is switched on by means of a key-operated switch mounted on the dashboard or by a hidden flick-type switch. The alarm then sets itself "on guard" automatically when the door is shut on the driver leaving the van.
When the driver re-enters the van a time-delay circuit operates to give him time to switch off the equipment before the alarm operates. The delay period is adjustable to suit the individual requirements and when it ends the alarm pulses the vehicle horn or klaxon. To prevent the vehicle battery from being run down, a second timer cancels and resets the alarm after a pre-set period has elapsed. A version which flashes the headlamps as well as sounding the horn is available and with a modification, an immobilizer can be introduced to neutralize the ignition in petrol engines) or the starter (in diesels).
The Bullion Van version employs an ignition-sensing circuit which sets the alarm "on guard" automatically when the vehicle is started up. The same circuit cancels the entry-delay timer and operates the alarm immediately should any door be forced open—this gives :a safeguard against hijacking and supplements the basic features.
A "panic button" circuit is also fitted which allows instantaneous operation of the alarm whether the ignition or main-circuit switch is on or off. Three isolated alarm contacts each capable of carrying lamp are available to operate the vehicle horns, klaxons, headlights and/or radio transmitter, An immobilizer version is also available which can be used to energize a solenoid-operated fuel valve or to make the starter or ignition circuit inoperative.
Made by: Digitation Ltd, Page and Girling Works, 111 Midhurst Road, West Ealing, London W13. Prices: (alarm units only) basic unit, £15 negative earth, £16 positive earth; bullion van version, £40.