F-940 Instruction Manual rev. 11/26/2019
1554 NE 3
rd
Ave, Camas, WA 98607, USA
87
Phone: (360) 833-8835
www.felixinstruments.com
6. Replace the Potassium Permanganate
Filter (KMnO
4
) models F-940, F-950,
and F-960 only.
a. Gently screw in the replacement
filter clockwise, until you feel
resistance. Do not over tighten.
7. Close the Instrument
a. Replace the four screws
attaching the black bottom plate
b. Replace the batteries,
side down and the battery cap.
c. Replace the rubber cap and turn
on the F-940.
8. Configure New C
2
H
4
Sensor Value on
your device (skip this step for model
F-920)
a. Power on the instrument
b. Select Setup, then press the
right arrow to enter the menu.
c. Use the down arrow to scroll to
Factory Setup. Press the right
arrow to enter the menu.
i. Press the right arrow to
enter the passcode 1111
Summary of Contents for F-940
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