CI-900 Instruction Manual 8/10/2015
1554 NE 3
rd
Ave, Camas, WA 98607, USA Phone: (360) 833-8835
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cid-inc
.com
www.cid-inc.com
72
11.
What are the most commons uses for Chamber In and Chamber Out?
a.
Both chambers are optional, but it is recommended to use Chamber In as
PolarCept for most measurements. The most common use for Chamber In is to
separate light hydrocarbons, such as alcohol, from the gas stream which may
interfere with the measurement. The most common use for Chamber Out is to be
filled with potassium permanganate, so that it cleans all ethylene and other
hydrocarbons from the gas stream, so that any ethylene that is measured must
have come from the sample. Chamber OUT is also commonly used with KMnO
4
to calibrate the zero of the ethylene sensors.
12.
During a monitoring experiment, will the sealed fruit chamber influence the result as
time goes on?
a.
The air should be scrubbed by enabling conditioning Chamber Out (filled with
potassium permanganate). Attach the tubing from the wand that returns to the
fruit chamber to the Out port on the front of the CI-900.
13.
How is Chamber In used to rehydrate the electrochemical cell?
a.
The electrochemical sensor can be rehydrated by putting distilled water in
Chamber In. If water is being used in Chamber In for separating out alcohols,
then refilling of the sensor will never be necessary. Similarly, if the sensor is
used in a humid environment, the sensor will not dry out.
14.
Where are temperature and humidity measured?
a.
The temperature and relative humidity sensors are located inside the CI-900,
before the electrochemical sensor. There is an additional relative humidity
sensor after the ethylene sensor to help track water loss.
15.
What type of membrane does the electrochemical sensor have?
a.
The electrochemical sensor uses a nafion or nafion-like membrane.
16.
What is the emission rate of ethylene from the fruit, taking into account the weight of
the fruit (or sample) and the time measured?
a.
Flow rate: 0.2L/min = 12.0L/hr
Sensitivity of C
2
H
4
PPM sensor to C
2
H
4
: 0.1 µL/L or 100 nL/L
Therefore, the CI-900 optimally detects around 1200 nL/hr. If the specimen
weighs 50 grams, then the emission rate is: 24 nL C
2
H
4
/gfw/h. The unit is
nanoliters of ethylene per gram fresh weight per hour.
Содержание CI-900
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