Abstract: A heat transfer device, including an evaporator, a condenser, a compressor fluidly coupled to the evaporator and the condenser. A refrigerant/oil mixture is routed to the compressor, the evaporator, and the condenser. An apparatus for moisture detection in the refrigerant/oil mixture includes the apparatus being in fluid communication with the mixture. The apparatus includes a refractive index determining device, a dielectric constant determining device, and a controller. The refractive index determining device produces a first signal representative of a refractive index of the mixture. The dielectric constant determining device produces a second signal representative of a dielectric constant of the mixture. The controller receives the first signal and the second signal. The controller determines a moisture content of the mixture dependent upon the first signal and the second signal.

Abstract: An automatic transmission fluid changer for connection with a cooling circuit of an automatic transmission, including a used fluid receptacle for collecting fluid pumped from the transmission and a new fluid receptacle for containing new fluid supplied to the transmission. The device monitors the quantity change in the new and used receptacles and regulates the flow of new fluid into the transmission in order to replace the used fluid expelled from the transmission with an equal amount of new fluid.