F-950 Instruction Manual rev. 11/26/2019
1554 NE 3
rd
Ave, Camas, WA 98607, USA
24
Phone: (360) 833-8835
www.felixinstruments.com
Sensor Exposure
The lifetime of a sensor depends heavily on
the application. Mainly the exposure to certain
gases and their concentrations have strong
impacts. For C
2
H
4
sensor, a lifetime of >2
years can be expected for discontinuous
measurement. Continuous exposure, even at
low concentrations should be avoided.
Volatile Organic Compounds (VOCs)
VOCs can dissolve in the sensor electrolyte or
adsorb onto the sensor’s housing. Both effects
can result in shifts in the baseline and/or
changes in the overall sensor performance
(sensitivity, response time...). When baseline
shifts happened, leave the instrument in clean
air after a few days for the sensor to recover.
Extreme Conditions of Humidity
If the electrochemical sensor (C
2
H
4
or O
2
) is
exposed for a very long time to a relative
humidity over 90%, then it will absorb a
significant amount of water that the inner
electrolyte will leak and destroy the sensor. On
the other hand, if a sensor is exposed for a
long time to a relative humidity below 15%,
then it will dry out and give no signal. Most
sensors can recover when they are stored in
ambient air for a month. But it is possible that
the sensitivity will be lowered and/or the
response time increased. Operations for
extended periods outside the range of 15
–90%
relative humidity will invalidate the warranty.
Summary of Contents for F-950
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