Description
The Johnson Controls A99BB-200C PTC Silicon Sensor With PVC Cable is a positive temperature coefficient sensing part that measures temperature and transmits a corresponding resistance signal to the control board for accurate thermal monitoring and system regulation. It operates through a silicon sensing element whose electrical resistance increases proportionally with rising temperature in an HVAC system, allowing the control board to interpret resistance values as precise temperature readings without signal drift over time. Installed on pipe surfaces, duct walls, and air handling assemblies, it is secured using a mounting clip or bracket with the PVC-insulated cable routed to the control board terminal.
