Pyroelectric pir sensor unit nicera psup43 12 this pir module works on the pyroelectric principle where a change in detected temperature produces an increase or decrease in generated electric potential the module consists of a quad element passive infrared sensor a lens and associated circuitry mounted on a pcb having a wide field of view in the horizontal and vertical planes as well as 12 detection zones make this module suitable for a wide range of applications nicera psup43 12 pyroel