F-940 Instruction Manual rev. 3-8-2017
1554 NE 3
rd
Ave, Camas, WA 98607, USA
39
Phone: (360) 833-8835
[email protected]
www.felixinstruments.com
Replacing the Potassium Permanganate Filter
(KMnO4)
The Potassium Permanganate will expire after prolonged use
and can be identified when the granules turn dark purple to
brown. The small black jar is the KMnO4 filter, just unscrew the
bottom plate of the F-940 unit after removing the battery cap,
unscrew the filter, screw in the replacement and you’re done!
Screw back into place the bottom plate and finally the battery
cap.
