PRESSURE VARIATION DETECTING TYPE LEAKAGE INSPECTION EQUIPMENT

摘要

Timewise changes in the difference between the pressure of fluid supplied at a set pressure into a tested article and the pressure in a comparison tank are detected (22). The detector's output goes through an amplifier (31), an AD converter and a data correction section (47) to a judgement circuit (41) which produces signals (51) indicating whether the article is good or not. The converter output also goes to a memory section (42) that records the values for a set (43) number of articles. The average of these values is determined (44), converted (45) to a correction quantity and supplied as modifying input to the correction section (47). The average value input to the conversion section (45) can be chan-ged to an initial correction value (53) by the action of a switch (52).