F-940 Instruction Manual rev. 11/26/2019
1554 NE 3
rd
Ave, Camas, WA 98607, USA
30
Phone: (360) 833-8835
www.felixinstruments.com
F-940, seen below. Continue through the
standard set zero process. The F-940 will
prompt the user to use “0 ppm/N2”. The Soda
Lime external conditioning tube creates a 0
ppm CO
2
environment, alternatively, the user
can connect N
2
gas, which provides a 0 ppm
CO
2
environment as well.
*The Soda Lime external conditioning tube
is used for the CO
2
Set Zero process only.
Next, verify the set zero calibration for all
sensors by measuring ambient air. Run the set
zero calibration again if the verification is not
successful.
Setup > Calibration
The calibration feature allows the user to set
zero and set span without the use of a
computer or G.A.S. (Gas Analysis Software).
Span calibrations should be performed every
3
months
for the ethylene sensor,
biannually
for the O
2
sensor and
annually
for the CO
2
sensor. Unlike the set zero process in the next
section, a zero-standard gas is required as well
as standard gases for the set span process.
The F-940 Store It! will prompt the user to set
up a zero gas, which can be achieved by
feeding 100% Nitrogen (N
2
) gas to the intake.
The unit will countdown to set zero. The
following screen will prompt the user to setup a
span gas, which is a known standard gas used
for the span calibration process.
Summary of Contents for F-940
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