Hi Steve Clark,
Leakage is an unspecified and therefore not guaranteed performance characteristic of our devices. However, Freescale does perform a 100% leakage test on all ported devices after assembly. The intent/extent of FSL's test capabilities is as a manufacturing quality tool/gauge to identify gross leakers (devices outside the leak test limits), NOT to quantify leakage as a cc/sec performance characteristic.
An additional recommendation when using ported pressure sensors, I would recommend to use hose clamps to helping prevent leakage and loosening, hose clamps provide a stronger connection to the sensor port. Clamps that are recommended for use in applications as described are the Oetiker Two-Ear Clamp, and the Oetiker One-Ear, and Special Clamp from Newage Industries.
AN1513: Mounting Techniques and Plumping Options of MPX Series Pressure Sensors
http://www.freescale.com/files/sensors/doc/app_note/AN1513.pdf
Have a great day,
Jose Reyes
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