Campbell Scientific CMP6-L, CMP11-L, and CMP21-L Pyranometers - Manual (Page 39)

Appendix A. CVF3 Heater/Ventilator
A.5 CVF3 Heater/Ventilator Maintenance
1. Refer to Section 8, Maintenance, for the pyranometer’s maintenance.
2. Inspect the area directly under the 120 mm diameter hole in the mounting
plate to ensure that it is free from leaves, snow, or other obstructions that
can inhibit air flow.
3. Unclip the CVF3’s filter cover and check the filters (see FIGURE A-5).
4. Replace filters as needed.
FIGURE A-5. CVF3 filter replacement
A-5