The microwave monostatic sensors FM-30, FM-60 each have detection zones divided into 12 sub zones in the direction of emission. This is a fundamental and very important advantage for these monostatic sensors in comparison with most other microwave monostatic sensors on the market. There is also the option to connect or disconnect one or several of these sub zones at the same time.

The first advantage for these new sensors, according to the manufacturer is their high interference immunity, one of the most important issues for microwave monostatic sensors. The design of the FM-30 and FM-60 incorporates high intellectual processing algorithms in the sensors, allowing them to achieve excellent interference immunity in comparison with many others. They also include a separate signal processing feature and sensitivity adjustment for each of the 12 sub zones.

For example, if an interference signal is greater in one of the sub zones than in the others, most monostatic sensors that do not include divided detection zones or sensors with a different principal of operation would most likely demonstrate a frequent false alarm rate. It may be also necessary to reduce the sensitivity of the whole detection zone, and thereby reduce the chances of detecting a real intruder. The FM-30 and FM-60 allow the engineer to adjust the sensitivity of each sub zone separately, so that the sensitivity in a «problem» sub zone can be reduced, whilst still maintaining optimum sensitivity level in the other sub zones. In this way high interference immunity can be achieved along with the optimal sensitivity adjustment along all the detection zones. This exact sensitivity adjustment for each separate sub zone provides wide opportunities for equipping complicated perimeter sites.

The second particular feature of these sensors is the option to disconnect one or several sub zones in any order. It may be necessary for «approved» passages to allow certain known or approved acitivites or interferences to carry on in certain zones without detection. Any interference or activity in the "off" sub zone that would normall y have triggerd the sensor does not generate an alarm.

When installing the sensors on building walls to monitor windows or doorways for protection against intrusion it is reasonable to turn on and use only the sub zones in the required detection zone where there are windows and doors. Disconnection of other sub zones will increase the interference immunity.

This approach is also convenient if the sensor has to be installed at a distance from the protected object or zone. Then only one sub zone located at a particular distance from the sensor is switched on. The other sub bands are switched off and the signals from them are not processed. So, an alarm is generated only when an intruder crosses the remote "switched on" sub zone.

The connection or disconnection of sub zones and their sensitivity adjustment in the sensors are performed via the control devices (on the enclosure) or with a computer through a USB connection.

The FM-30 and FM-60 also have useful functions such as anti-masking function and can be operated remotely and they have an extended range of supply voltage from 6 to 30 V.

The FM-60 has various forms of detection zones (for example volumetric, curtain or fan) allowing for use in a wider range of applications. They can protect both linear (perimeter) and non-linear sites (walls, ceilings, roofs, adjacent territories).

The maximum detection zone length of the sensors is 60 metres for the FM-60 and 30 metres for the FM-30. The detection zone length is regulated by successive disconnection of sub zones. The length of each sub zone is 5 m for FM-60 and 2,5 m for FM-30.