Instruction Manual MIC type EC-912
Revision no.4
28 / 38
Exchange of filter element:
The filter unit is incorporated in the FCU to reduce the smoke deposits in the flow me-ter. The filter
element can be exchanged by dismounting the removable part of the filter unit on the rear of the FCU
(refer to Fig. A.1.4 in Annex 1). The filter unit is intended for filter element EC 999-01 manufactured by
FORCE Tehnology. This part is pressed into the fixed filter unit and the filter unit assembled. (Refer to
Fig. 5.1.2).
Fig. 5.1.2
Exchange of filter element
The filter element may be blocked by smoke more or less rapidly depending on the type of smoke
measured. In some applications it may be more practical to replace the MSA filter with a 10-12 mm
thick polyurethane filter cut circular with a diameter of 68 mm.
The consequence of this is of course that cleaning of the flow meter is needed more of-ten. A filter
combination which prevents smoke deposits in the flow meter and gives acceptable operating times
without filter exchange should be aimed at.
When assembling the filter unit make sure that the O-seal remains in position in the removable part.
Check the filter unit for tightness by the method outlined in Section 2.1.3 k) and l), after assembling
filter unit.
Vacuum Pump (VP)
The Thomas type VTE 3 pump contains an inlet filter and rotor blades which should be checked
regularly. The rotor blades may be replaced by new blades when necessary.