Sentry Quench Systems utilize a cylindrical steel tank which incorporates a motor-driven circulator mounted in a flow control tube, an optional immersion heater and a perforated steel work basket. Dual circulator propellers in the flow control tube provide positive, uniform distribution of the quenching medium throughout the work area and rapid heat transfer through the entire system. The design assures optimum conditions for tool heat-treating applications. An over-temperature alarm system is provided to meet OSHA requirements. An optional heater is recommended.