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Spray technique local leak test

In order to avoid a surge of helium when the spray valve is opened (as this would contaminate the entire environment) it is advisable to install a choke valve to adjust the helium quantity, directly before or after the spray pistol (see Fig. 5.15). The correct quantity can be determined easiest by submerging the outlet opening in a container of v/ater and setting the valve on the basis of the rising bubbles. riable-area flowmeters are indeed available for the required small flow quantities but are actually too expensive. In addition, it is easy to use the water-filled container at any time to determine whether helium is still flowing. [Pg.122]

The helium content of the air can also be detected with helium leak detectors where large leaks allow so much air to enter the vessel that the 5 [Pg.122]

Avoiding the helium surge when the pistol valve is opened [Pg.122]

Minimum helium quantity for correct display Changing the setting for the throttle shall not affect indication. [Pg.122]

The minimum quantity is always much smaller than one would set without a flowmeter (e,g, by listening for flow or letting the helium flow across moistened lips). The simplest check without a flowmeter Letting gas bubble through water. [Pg.122]


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