The PMI-3000 Dilution Probe performs four critical functions to prepare the sample from the stack or process, so it can be measured accurately and precisely by the analyzer. The probe uses an air driven aspirator which extracts the sample from the stack or process. It is then passed consecutively through coarse and fine particulate filters, a pre selected glass or metal critical orifice, and finally diluted with the air from the aspirator. This process has now reduced the dew point of the sample to below that of the ambient air, preparing the sample so that it can be transported via an unheated line to the analyzer up to 300 feet away.

There are two models of the PMI-3000 Dilution Probe available, differing only in the type of mounting flange. Model PMI-3200, equivalent to the EPM 0797.302, has a 1.8" flange drilled and tapped with four mounting holes. Model PMI-3300 (equivalent to EPM 0797.303) has a threaded flange for easy use with extension tubes.