Improves test accuracy on works that are temperature-sensitive and deformed by air compression.
In simultaneous-comparison method, two works are compared simultaneously. It cancels out the error factors such as temperature changes and deformation, achieving highly accurate leak test. However, when the two works have the same amount of leaks, the works could falsely Pass the test. So, the method is not recommended unless Fail rate of the works is extremely low. In Multi-comparison method, on the other hand, the work is compared with the master and also with another work in one test cycle. This minimizes false Pass judgments when the works have the same amount of leaks, realizing leak test of high accuracy.
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■ Features • Improves test accuracy on works that are temperature-sensitive and deformed by air compression: By comparing twoworks sharing almost same conditions simultaneously, such possible errors as volume change by temperature change and deformation of the works can be canceled out achieving highly accurate measurement. Master-comparison minimizes the possible false judgments. Even when the two works have the same leaks, use of Master-comparison minimizes the probability to miss them. • Reduces test time: Simultaneously testing two works and a master reduces test time. • Up to three works can be tested simultaneously: It is also possible to compare three works without using a master. • Master-preset to enhance accuracy: Master-preset compensates the differential pressure caused by factors other than leak, such as changes in ambient temperature. Master-preset operates in the Master-comparison and the simultaneous-comparison.
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Applications/Examples of results
Air Leak Testers are automatic leak testers that detect minute pressure changes by applying air pressure or exhausting to a vacuum, providing a judgment on the quality of parts or finished products that require airtightness. Engine parts / engine valve seats / cam caps / cylinder blocks / engine assemblies / crankcases / cylinder heads / oil pans / crankshafts / cylinder head covers / camshaft balls (plugs) press-fitted / cylinder pistons / fuel system components / PE, VE pumps / injection valves / canisters / carburetors / throttle chambers / throttle bodies / delivery pipes / filler caps / fuel injectors / fuel quick connectors / fuel senders / fuel tanks / fuel pipes / fuel pumps / fuel pump check valves / fuel pump relief valves / common rails / vent valves / engine assembly fuel systems / intake and exhaust parts / EGR pipes / PCV valves / intercoolers / intake manifolds / inlet pipes / exhaust manifolds / throttle bodies / turbochargers / bearing cases (for turbo) / mufflers, etc.
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Company information
Cosmo’s Air Leak Testers began with the automation of cylinder block airtightness tests for engines in 1970. Our products are utilized in various fields including automotive parts, gas, water supply, medical, electrical, electronics, and food. In line with the overseas expansion of Japanese automakers, we began our own overseas expansion in 1983. We now have 24 sales and service offices in 13 countries. We are offering proposals and providing after-sales services overseas as in Japan. Currently, in order to support the electrification of automobiles, our products are being used for leak testing of parts for electrification such as battery cases and inverters as well as for fitting testing of electric power connectors. We are contributing to the efforts by our customers to prevent emissions of CO2. In various regions of South and Southeast Asia, we are donating pressure measuring equipment to technical schools to improve the quality of education and exchange technologies with local machinery manufacturers. We have been making every effort to help improve the industrial base through local manufacturing of high-quality leak testing equipment.