CMS/User Guide - Filterteknik

The factory set value of 2 minutes is suitable for most applications,but the user is free to set a different value. Shorter times will makethe CMS more responsive to short-term fluctuations in contaminationlevel. It will also result in less consistent results for the largeparticle sizes and clean systems, due to statistical fluctuations in thenumber of particles counted.Longer tests will allow more "even’’ results in very clean systemsand for the larger particle sizes, since there will be a larger totalnumber of particles counted during the test. This means that anyfluctuations have less of an effect on the test result.12.4 Test FormatUse the selector to choose the preferred display Format (ISO, NASetc). This selection is not just cosmetic since it also determines howthe cleanliness alarm targets are to be interpreted, if these are used.12.5 Flow Indication• The CMS uses the width of the pulse to derive flow, its flowoutput is only an indication, intended for installation guidance.• It is worth reinforcing that the primary function of the product isto produce a measurement of cleanliness, and not act as a flowmeter. If the unit produces a contamination measurement, thenthe flow rate is high enough for it to do so.• The CMS needs particles to pass through the flow cell to calculateflow, the dirtier the system is, the more statistically accuratethe flow output becomes.32 Settings