Abstract: An apparatus for automatic leak detection includes an adiabatic tank, an electronic pressure regulator in fluid communication with the adiabatic tank, and an electronic processor in electronic communication with the electronic pressure regulator. The electronic processor is to automatically determine an optimum adiabatic pressure based on an ambient atmospheric pressure, a test pressure, and an ambient air temperature. The apparatus is to generate the optimum adiabatic pressure automatically in the adiabatic tank via the electronic pressure regulator in communication with the electronic processor.