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We have to distinguish conceptually the periodic calibration from the ordinary verifications into two different processes:

For calibration we intend a proceeding that has to verify the total working of the equipment in terms of correspondence with the declared precision limits of the electronic measure and of the pneumatic working.

The ordinary verification is done at predefined intervals and it is intended to control the equipment within the limits of the normal use, and then to verify the indication of Good and Waste applying respectively a sample for this hermetic test and another one with a known leakage.

Both the proceedings must be done at pre-established time intervals.
M2710 is a portable digital calibrator designed to perform calibrations on the industrial leak tesing systems.  

For more details refer to the product technical page

Analyzing the different specifications or norms concerning these proceedings it comes out that no data is universally applicable.

The typical range for the calibration operation can be estimated in 6 or 12 months. The typical range for the operation of ordinary control can be determined by the number of pieces produced and approximately at ranges at 25% of daily production.

By consequence, and referring especially to ordinary controls, it is necessary to define a practice of methods and the times in order to validate samples to make these controls.

This calibration is necessary essentially to set the zero and the full scale of the absolute measure of pressure, and where requested and however only in terms of verification, the decay measure during the test. It is the same we discuss in order to make a sample having a controlled leak.