F-900 Instruction Manual 8/14/2017
1554 NE 3
rd
Ave, Camas, WA 98607, USA Phone: (360) 833-8835
33
www.felixinstruments.com
Ethylene Sensor Zero Calibration
The instructions above are for two-point calibrations of the F-900. Solely setting zero for the
ethylene sensor can be accomplished through the Settings screen. 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 Set Zero procedure can
be done manually or the F-900 can be programmed to perform the process automatically, as
described below. In both cases,
potassium permanganate (KMnO
4
)
is used to scrub ethylene
from the gas and set the zero.
It is not recommended to use N
2
gas to zero the C
2
H
4
sensors. N
2
gas typically has hydrocarbon
impurities which could create signal for the ethylene sensor. Standard ethylene gas (0 ppm) can
be used to perform the zero calibration.
Note:
(To set zero for the PPM sensor only, navigate to Setup > Sensor > Sensor
Selection > C2H4 PPB > OFF before proceeding with the following steps).
If using PolarCept, it is recommended that the set zero process be completed with Chamber IN
enabled. The DI water used for PolarCept can introduce additional impurities. Setting zero with
Chamber IN enabled will both account for these impurities in the baseline adjustment as well as
clean the DI water to optimize its performance. Refer to the Manually Set Zero: PolarCept
Enabled below.
Manually Set Zero: Standard Operating Procedure
This procedure falls under the Measurement > Settings menu option:
1. Place potassium permanganate (KMnO
4
) in Chamber OUT.
2. Power on the instrument and allow adequate warm-up time (3 min).
3. Press the right arrow when Measure is highlighted to begin a measurement.
4. Let the sensor stabilize and automatically begin measuring.
5.
Once the measurement begins, press the right arrow until you access the “Settings”
menu.
6.
Scroll down to “Set Zero”.
7.
Press the right arrow to highlight “C
2
H
4
”.
8. Press Enter.
9.
A message appears asking “zero selected sensors?”
a. Press Enter to confirm.
10.
A message appears asking to “Place KMnO
4
in CH_Out.’”
a. If KMnO
4
is in Chamber OUT, press Enter to confirm.
11.
The display will switch to Monitor Mode and “correcting offset” is shown at the bottom.
a. The settings will automatically change to:
i. Chamber OUT = On
Summary of Contents for F-900
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