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As a policy of continual improvement, RMF reserves the right to alter the specification without prior notice.
201.028 REV 1
Date of Issue: 18 June 2018
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The CMS needs particles to pass through the flow cell to calculate flow, the dirtier the system is, the more
statistically accurate the flow output becomes.
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Conversely, when placed on a very clean system the unit can have difficulty in working out the flow due
to the very low number of particles passing through the flow cell.
To overcome this, the test has to fulfil certain conditions to create a valid result.
It the low flow alarm has been disabled there must be a minimum of 20 particles >4micron seen during
the test for the flow reading to be shown and the test result to be valid.
If there are less than 20 particles >4micron during the test then the CMS will alarm/fault code even if the
low flow alarm has been disabled.
Note: If the low flow alarm has been disabled, it is preferred that the CMS is installed in such a way that if
the system is shutdown (zero flow) the CMS is also shut down so as not to measure stagnant fluid and
provide erroneous readings.
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It may be necessary that the low flow indicator is turned off if filtration is below 10um (ISO 14/12/10 (NAS
Class 4)), see figure 6.22 for location.
6.3.3.7 Continuous Testing
Figure 6.23
In the
Continuous Testing
area are settings which control how the CMS decides when to perform and log a test.
Selecting Test Continuously makes the CMS automatically repeat the test, according to the specified Test Interval.
a)
Setting an interval longer than the test duration; results in the test being repeated upon each expiry of
that interval. For example, setting a Test Duration of 1 minute and a Test Interval of 10 minutes, results in
a 1 minute test performed every 10 minutes.
NOTE: Test time is part of interval time
b)
Setting the interval to a value less than the Test Duration (for example zero); results in a new test being
started immediately after a test finishes.
Log Continuous
controls whether tests are logged during continuous testing. This is to avoid the test log being
cluttered by potentially large numbers of unwanted test results. If Log Continuous is not selected, then only the
"final" test in a sequence is logged (see Alarm Modes section and "Stop Testing When Clean" below).
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