Operation mode "Vacuum"

The inlet flange is located on the upper side of the device.

To be able to calibrate using the vacuum mode a suitable external calibration leak must be mounted on inlet flange. See also "Calibrating in the operation mode "Vacuum"".

To be able to perform leak detection using the vacuum method the inlet flange must be connected to the desired test object.

If the pressure in the specimen is less than the surrounding pressure, then helium (which is sprayed over the specimen) can penetrate into the specimen if there is a leak. Helium can be detected in the leak detector using a mass spectrometer.