For Integrating Pressure-Instrument we have a term and definition in Natural Gas.

The integrating pressure-instrument registers the total volume of gas metered in cubic feet at a specified base pressure. This instrument is equipped with a second register which records the total volume at the flowing pressure. Each unit of volume flowing through the meter causes the integrating mechanism to make one cycle and apply the correct pressure multiplier for that unit. The summation of these products is registered on a counter index indicating the displaced volume at base pressure.
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