A system for preparing a refrigerant sample for analysis including a pressure regulator assembly including a pressure regulator and provisions for heating a refrigerant sample contained within an interior region of the pressure regulator. The circuitry substrate has a plurality of exposed conductive bumps in electrical connection with the integrated circuitry. By using this type of photo mask, a substantially flat layer of photoresist film can be deposited even on top of an uneven surface to manufacture a thin film transistor array panel.