The LHi 1128 pyroelectric infrared detector is a special design for motion control in ceiling mount applications. It includes a Quad type pyroelectric ceramic with 4 sensitive elements connected to one FET in source follower connection.Thus it offers a single channel output .
The LHi 1128 detector is available in TO-5 housing with infrared filter. It offers excellent common mode performance (match) and low noise.

Single FET Output
Four Element Detector
Designed for Ceiling Mount Applications