The Honeywell C7735A1000 Temperature Sensor is the correct replacement used with the following:
The Honeywell C7735A1000 Duct Air Temperature Sensor is a duct-mounted temperature probe that provides capacity control of your HVAC equipment. Also known as a discharge air temperature sensor (DATS) it is only used with zoning solutions that include TZ-3, EMM-3 and EMM-3U control panels. It senses the delivered air temperature and cuts off the heating or cooling when the delivered air temperature increases or decreases the normal operating limits.
Honeywell C7735A1000 Sensor Specifications:
The Honeywell C7735A1000 DATS Sensor is heat pump compatible. It requires 2 wires to connect to the zone board.