The ADT 938 is specially designed for calibrating oil-free pressure measuring instruments in the range from 85% vacuum to 15,000 psi (1000 bar). All parts used in the pump are carefully cleaned to remove oil. The pump uses water as the media. With the patented screw press technology, the high pressure can be easily generated, increased and decreased smoothly. A specially designed shut-off valve makes the pressure stability as high as possible during calibration. Without non-returning valve that is usually used in "trouble-maker" hand pump, ADT 938 has minimal maintenance required. Two finger-tight connectors installed on the pump allow the user using fingers to connect and disconnect the reference gauge and devices under test quickly and easily without the need for PTFE tape or wrenches. The ADT 938 is an ideal comparison test pump for calibrating oil-free pressure measuring instruments against test gauges, indicators or transducers in the laboratory.
