Honeywell T4031A,B; T6031A,B REFRIGERATION TEMPERATURE CONTROLLERS THE T4031A,B AND T6031A,B ARE TEMPERATURE CONTROLLERS USED IN A VARIETY OF COOLING APPLICATIONS WHERE REMOTE MOUNTING OF THE SENSING ELEMENT IN THE CONTROLLED MEDIUM IS REQUIRED. Tl TA031A 0 T0318 0 780314 OQ TE031A + Wide control temperature range is suitable for controlling ducts, tanks, freezers, coolers, display cases, and defrost termination. » Universal mounting bracket Is available for easy replace. men of other controllers.