Reference 8-55
have a sufficient tolerance making more precise testing unnecessary, such as
mass flow. The part is continuously pressurized while air escapes to
atmosphere through the tested passages. The residual pressure (back-pressure)
at the inlet of the part is measured and must remain within a specific range of
pressure defined by maximum and minimum limits to pass the test.
Force Decay Test: During the fill (evacuate) step, the air evacuates in the chamber
around a package, causing the internal pressure of the package to expand.
This expansion is measured by the force sensor; any decay in the
measurement will indicate that the package is leaking.
Gauge Pressure: A force referenced to barometric pressure. Qualitek mR uses a
gauge regulator to keep the pressure constant as barometric pressure
changes.
Gross Leak: A leak that causes a drop below the negative pressure error during the
stabilization phase. Typically, when a product under test has a gross leak,
pressure cannot build high enough to reach test pressure. If Qualitek mR
indicates a gross leak in good products, a larger pressure error value may be
needed. This is often the case when testing large product or products
constructed of flexible materials. See Pressure Error.
Hardware Calibration: A sometimes-used term for sensor calibration.
Help: Get technical help from Uson by calling +1 281-671-2222. Help is available
during normal business hours in the Central Time Zone of the USA.
Interface Communication: between Qualitek mR and a peripheral device such as a
PLC, computer or printer. Qualitek mR has many interface options such as
an I/O port for discrete communication, an ethernet port, and serial port for
test result output. The serial port uses a serial protocol known as RS-232 to
communicate. The interface is setup in the Serial Port Menu reached through
the Hardware Menu.
I/O (Input/Output): Devices or connections used by computers and Qualitek mR to
communicate with other devices such as Programmable Logic Controllers
(PLCs). See PLC
Jump: In the Test Parameter Menu use the Jump Menu to link programs in a
variety of ways.
Keypad: The 5 blue buttons on Qualitek mR’s front panel used to enter program
values and other setup information.
LCD: Abbreviation for liquid crystal display. Qualitek mR’s display is an LCD touch-
screen device that provides setup prompts, menu options, test results, and
other system information.
Leak Calibration: (Sometimes called Comp and Cal or Test Calibration) Leak
Calibration is only required if a leak rate is to be computed and not just a
pressure change. Leak Calibration requires a master, non-leaking part and a
certified leak master with a known leak rate at a specified pressure.
Leak Rate: A pressure drop over time can be stated as a leak rate. For example -0.02 psi
per second is a leak rate. A leak rate can also be stated in flow units, such as
4 cc/minute.
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