F-900 Instruction Manual 8/14/2017
1554 NE 3
rd
Ave, Camas, WA 98607, USA Phone: (360) 833-8835
17
www.felixinstruments.com
Measurement Settings
The
Settings
screen is accessed by using the
right arrow
from Monitor Mode, and provides a
short list of variables which may be manipulated while measurements are being made. The
exterior Conditioning Chambers are turned On/Off, valves are closed causing gas to circulate
internally (Closed Loop On/Off), or the ethylene zero calibration (Set Zero) can be initiated.
Chamber Out is primarily used with potassium permanganate (KMnO
4
) for cleaning water and
setting the instrument’s offset.
Changes cannot be made to the settings menu if the F-900 is
“correcting offset”. If the measurement is setup for PolarCept (Setup > Chamber > Chamber In
= Special) then Chamber In cannot be turned on/off from the Measure > Settings menu. The
measurement must be stopped and default Setup Menu parameters changed.
The Set Zero procedure begins by automatically closing the IN and OUT port valves on the front
of the instrument (Closed Loop) and enabling Chamber Out (On) with KMnO
4
. The instrument
will continue to record data to the file, with the mode listed as “offset”. The length of time for the
offset can be changed by navigating to Setup > Calibration > C2H4 > Offset Correction. It is
recommended to keep at 10 minutes. See page 34 for more details on ethylene offset
performed from the settings screen.
Figure 11: Measurement > Settings Menu display (left); flow path of internal gas stream (right).
Notes About Measurements with the F-900
Electrochemical Sensor Response
The lag in sensor response is a natural phenomenon for charged porous membrane electrodes.
The platinum electrode can be thought of as a series of cylindrical pores. Each of these pores
will have a double layer in the radial direction. The interactions between the molecules,
convection from air movement, electric fields and the concentration gradient result in a lag
SETTINGS
Chamber OUT On
Chamber IN Off
Closed Loop On
Set zeros C2H4
Uptime 01:15 Bat 75%
Summary of Contents for F-900
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