The PTS100 is a floor standing, self contained test system designed to measure the porosity of prepared samples. It uses a rateof- rise technique, measuring the porosity of the sample to air or another gas by ‘leaking' gas through the sample into a volume. Flow through the sample is determined using fundamentals of volume, change in pressure and time.

The rig accurately measures the absolute pressure on both sides of the sample, and an electronic timer automatically measures the time between two pre-selected vacuum levels. In the example above the customer specified a mechanical pressure gauge be fitted to allow comparison with older equipment. However, the response time of this type of gauge introduces significant errors.

In operation the user can select different volumes or volume combinations to give good accuracy over a range of flows, and reduced inlet pressure can be used for delicate samples. An oil free
vacuum pump is fitted to evacuate the volumes without the risk of contaminating samples,
making the unit completely self contained.

Schematic