Technology: What is the difference between analogue and digital PIR sensors?

Most occupancy sensors use Passive InfraRed (PIR) technology for detection. Other technologies are possible as well but less well suited for most applications.

However, there are 2 classes of PIR sensors. Most available motion sensors use analogue PIR technology. This results in low sensitivity and large sensors.

In contrast, EPV occupancy sensors exclusively feature digital PIR technology. This enables occupancy sensors which are much smaller, more sensitive and immune to false triggerings.

Analogue sensors    Digital occupancy sensors


The very small signal travels from the PIR element to an amplification electronics circuit. 1st amplifcation stage is integrated into the PIR element and is electrically fully shielded  (Faraday cage)
In its course, it is vulnerable to electromagnet interference, for example from electrical switching impulses, WiFi signals, mobile devices, etc. These can cause false alarms. All external disturbances are completely eliminated
As a result, the possible amplification (i.e. sensivity) is physically limitied. As a result, higher sensitivity (amplification possible)
Immunity to false triggering: Usually no more than 3 Volt / meter. Immunity better than 10 Volt / meter
Cheap to manufacture Significantly more expensive to produce due to highly integrated design
Large devices Much smaller devices possible.

EPV offers only digital occupany sensors.