93-520-20 Issue 3.3
Page 50 of 60
CirrusPro Engineer’s Manual
4.4.2 Replacing the chamber filters
The two chamber filters are be found by removing the two large Allen Key plugs on the Cirrus Pro
cloud chamber.
With the unit switched off, remove the Allen key plugs and remove the filters.
Replace with new filters and refit the plugs (do not over tighten).
Although a used filter may appear to pass the recommended flow, the dust it has trapped can cause an
increase in the retention of sub micron fire particles, and therefore reduce system effectiveness.
With the plugs removed the Cirrus Pro is no longer sampling from the sampling pipes!
4.4.3 Fill the Water Bottle
The water bottle must be filled during every service visit.
Unscrew the bottle top and fill the bottle with the triple de ionised water, take care not to contaminate
the water pipe.
Refit the bottle top and reattach the bottle, if necessary.
4.4.4 Check Pipes Connections
The above procedures can disturb the pipe connections.
Check all pipes connections before confirming system operation.
4.4.5 Confirm Operation
Using a particle source at the furthest sampling point confirm that each pipe works to the design
specification the operation of the unit should be confirmed.
Also, check that the outputs change over in accordance with the fire plan.