Test and Production Engineers are often faced with the task of detecting occlusions in products quickly, accurately and inexpensively.

Mechanical pressure measuring devices such as tube and bellows pressure gauges are insensitive, slow, subject to operator errors. Dunk testing (looking for bubbles under liquid) is time consuming, cumbersome and leaves the subjectivity of the operator.

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Occlusion Testing (Pressure vs. Time)

On the other hand, overly complicated flow testing equipment is probably too elaborate for the task. Custom designed PLC based test equipment is frequently expensive and difficult to program. Furthermore long-term engineering support becomes more difficult.

The off the shelf solution of Isaac of leak testers work like a pressure gauge, except the Isaac has the advantage of a high resolution (24bit) digital readout with timers and limit settings. Imagine an analog gauge with a resolution of 1/100,000 psi, and set-points to determine an allowable drop in pressure. If the pressure does not drop below the reject set point, the product is considered bad. If the pressure remains above the reject level the product is considered occluded.

Typically the occlusion test can be performed at the end of a pressure decay as a linked test without the need to disconnect the part.

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