The MD-490S suppression feature will automatically correct for changes in the ambient helium level; it is similar to using the standard auto zero function. This mode allows the unit to detect and prevent the leak rate from dropping below zero within the user selectable test range as ambient helium levels in the testing area begin reducing. This feature allows the unit to provide accurate quantified measurements for “go/no go” leak testing to a specific reject set point in areas where the helium background levels are dynamically changing. For program revision 01 or higher this feature can be turned off via the menu function. In addition 01 and higher zero suppression only operates when the unit is in a testing mode and enabled.
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