Abstract: An improved refrigeration manifold having an unrestricted and uncomplicated flow path as well as a simple and efficient valve system is disclosed. The refrigeration manifold includes a manifold body having a first passage extending horizontally through the body and second and third passages extending vertically through the body to form the high and low sides of the manifold. One or more passages extend through the body from the first passage to the bottom of the manifold body for connection to a vacuum or refrigeration source. First and second ball valves are disposed in the first passage for selectively opening and closing the first passage. Third and fourth ball valves may be provided in fourth and fifth passages which are provided for connection to a vacuum and charging source, respectively. The ball valves are operable by moving a lever through an arc of 90.degree. for quick turn off.

Abstract: An electronic device for observing temperature and pressure and for indicating pressure, especially very low pressures. The device has a single sensor element for responding to both temperature and pressure. The device includes a sequence timer for causing the device to first observe the resistance of the sensor when the device is first turned on. The timer then applies a voltage across the sensor, causing a known current to flow through the sensor. The current heats the sensor an amount corresponding to density and therefore the pressure of the gas to which it is exposed. A calculating device is provided for calculating the temperature from the observed value of the initial sensor resistance and the pressure from the observed values of current flow and subsequent sensor resistance. A display is provided for indicating the calculated pressure.