Abstract: A liquid pressure calibration apparatus is disclosed, wherein a first liquid path (200) and a second liquid path (300) with different pressure output ranges are arranged in parallel between a liquid pressure inlet port (A) and a liquid pressure output port (B) of the liquid pressure calibration apparatus, and the pressure output range of the first liquid path (200) is continuous with the pressure output range of the second liquid path (300). A target pressure to be output is compared with a switching pressure, and the first liquid path (200) or the second liquid path (300) is selected to supply pressure to the liquid pressure output port (B) based on the comparison result, and the target pressure is output.

Abstract: A fully-automated handheld pressure calibrator, comprising a housing, and gas circuit and electrical circuit components installed in the housing. The gas circuit components comprise a pressure source capable of supplying a pressurized gas. The gas circuit and electrical circuit components are integrated and installed in the housing in a modular manner, and the shape of the housing is suitable to be held in a hand. The pressure calibrator of the present invention enables all kinds of functions including pressure generation, pressure control, pressure instrument connection, and recording, result calculation, and report output of a pressure calibration process, and is suitable for on-site an on-line calibration of a pressure instrument.

Abstract: A fully-automated handheld pressure calibrator, comprising a housing, and gas circuit and electrical circuit components installed in the housing. The gas circuit components comprise a pressure source capable of supplying a pressurized gas. The gas circuit and electrical circuit components are integrated and installed in the housing in a modular manner, and the shape of the housing is suitable to be held in a hand. The pressure calibrator of the present invention enables all kinds of functions including pressure generation, pressure control, pressure instrument connection, and recording, result calculation, and report output of a pressure calibration process, and is suitable for on-site an on-line calibration of a pressure instrument.