Specifications

Page 4-10 FPT-40 Installation & Operation Guide
9. Loosen and remove the four (4) Phillips head screws holding the
sensor/prism housing to access the sensor prism and replace. Use
CAUTION not to break any of the ribbon cables. Also, the
replacement prism must be mounted with the soft side facing
outward.
10. Replace the sensor lens with the new spare, and perform the reverse
procedure to re-install the sensor housing, screw the back case on,
and remount the terminal to the wall bracket.
11. Reconnect the communication cable, and Power Adapter connector.
Note: It is recommended that the above procedure be performed by
someone with electronics knowledge.
Prism Housing