F-900 Instruction Manual 8/14/2017
1554 NE 3
rd
Ave, Camas, WA 98607, USA Phone: (360) 833-8835
8
www.felixinstruments.com
the polar molecules are held in the trap, while ethylene passes through the water trap to the
sensor, where oxidation occurs. CO
2
is released as the oxidation product from the sensor. The
water being used can become saturated after several minutes, so it must be cleaned of the
trapped interfering gas molecules. Trapped interfering gases are driven out of the water during
the cleaning time by a concentration gradient.
It is recommended to always use the PolarCept filter when measuring a gas mixture or
interfering gases present will be reported by the instrument.
Alcohols can induce a baseline shift and/or change the sensitivity of the ethylene sensor. To
recover the sensor after exposing it to alcohols, run it with clean air for a few days.
NOTE:
Unless using ultra-pure DI water, the water used for PolarCept will likely contain
impurities. Before using PolarCept, it is important to perform a manual set zero of the ethylene
sensors with Chamber In enabled. For more details on this process please refer to the ethylene
sensor zero calibration, starting on page 35.
PolarCept: Measure
Regeneration: cleans the water
PolarCept: Clean
Figure 5: Top: diagram of measure period during use of PolarCept. Bottom: diagram of cleaning
period of PolarCept.
Summary of Contents for F-900
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