CM4 Four-Point Continuous Monitor
9.3.1 CM4 Internal Filter Replacement Procedure
See Figure 9-6
Figure 9-6: Filter Maintenance
2 Filter block handle
3 Gray ring
The Model CM4 will use one of the filter blocks shown in Figure 9-7.
Note the positions of the filters for your type of filter block. The filter
block is keyed to fit only one way into the instrument.
CM4 Technical Manual
4 Particulate Filters
5 Acid scrubbing filter
Filter Assembly Type 1:
Filter Assembly Type 2:
Figure 9-7: Filter Block Orientation
The following steps apply to all filters located within the CM4. Refer
to these steps when performing maintenance on any filters in the
1. Open the tape load lever to the servicing position.
2. On older model CM4's, release carrier retaining clip by pressing
toward rear of unit.
3. Remove the Chemcassette
under it, palms up, and lifting straight up. See
To avoid carrier torque and damage, do not tilt the carrier. Contact
Honeywell Analytics if you are unable to remove the carrier.
carrier by placing your fingers