An oxygen sensor pressure compensation system includes a static pressure compensation module to receive an oxygen sensor signal from an oxygen sensor and a pressure signal from a pressure sensor and to perform static pressure compensation. A fume extraction duct extends from the nozzle and through the handle. The artificial lift system uses small diameter continuous tubing to run the pump in the hole and deliver small volumes of high pressure dry gas as a power fluid to the pump. The cascode transistor is cascode coupled to the input transistor. A pinning layer is disposed adjacent the pinned layer for fixing the pinned layer magnetization.