High pressure dynamic micro differential pressure gauge, and methods for using and checking the same

A method for checking a high pressure dynamic micro differential pressure gauge, said micro differential pressure gauge comprising:

• a set of vertical manometer tubes in communication with each other, wherein one or more of the manometer tubes are connected to a resistance meter (2) through signal lines (4), and wherein:
• the resistance meter (2) is connected to a data collection and processing control system (3);
• each manometer tube is full of low conductivity buffer liquid and high conductivity manometric liquid;
• the resistance meter (2) is configured to measure resistances in the one or more manometer tubes;
• and
• the data collection and processing control system (3) is configured to convert the resistances measured by the resistance meter (2) into a differential pressure,
• said method comprising:
• connecting an equal number of visible U-tubes in parallel at ambient pressure with the high pressure dynamic micro differential pressure gauge;
• and
• maintaining a pressure at the tail end while applying a series of different slight pressure variations to the head end, so as to record resistance data displayed on the resistance meter (2), a liquid level variation in the visible U-tube, and a variation of a micro differential pressure in the high pressure dynamic micro differential pressure gauge.