The top secret report is in the committee room, and only authorized personnel are allowed to look at it. For reasons of security, it is necessary to update the report on Shabbat. But is there any way to enter a room which is protected by controlled access, with an alarm system?
In the modern world, electronic controlled access systems are common not only for uses of security. They can be found on the doors of almost every guest room in today's hotels, which can only be opened with a magnetic card. The same is true for health institutions and more.
Many types of systems exist. Examples are numerical keypads, card readers, proximity detectors that sense a smart card, and biometrics (fingerprints, images of the face or the retina, and more).
The Zomet Institute has been involved in designing security systems, most of which cannot be described in detail for obvious reasons. In the health field, we offer a device based on the principle of gramma (indirect operation). We will describe a system installed in the IDF that can be used on Shabbat in place of proximity detectors, which are becoming more and more prevalent. It is typically used only by Shabbat observers, while others continue using the system in the regular way.
One who wants to use the system presses a button which turns it off for four seconds using a gramma mechanism. During that time – as signaled by an electronic light – the user puts his card into a special slot. When the current returns, the system reads the code and opens the door.
In Shabbat mode, any special switches in the door are bypassed.
If a guard must open the door remotely to allow access to a person he has identified in a surveillance camera, a gramma switch is used. Systems of this type are common in synagogues abroad, where people are admitted only after being identified remotely by a guard.
For details and prices, contact The Zomet Institute.