Bio-Science CI-900, Operation Manual, Page: 21 / 94

CI-900 Instruction Manual 8/10/2015
1554 NE 3
rd
Ave, Camas, WA 98607, USA Phone: (360) 833-8835
sales@ cid-inc .com www.cid-inc.com
16
Monitor Mode
The large bold value on the top line is the digitally filtered value of the raw ethylene measurements.
Next, the HUMIDITY, or relative humidity in percent, of the gas stream in the instrument is
displayed followed by the TEMPERATURE in degrees. The PRESSURE or atmospheric pressure, is
displayed. Press the DOWN arrow to view the FLOW in milliliters per minute. The default flow rate
is 200 mL per minute. If the unit has a high resolution CO
2
sensor on board, the CO
2
value in ppm
will be displayed below the ethylene value. If the unit has a low resolution CO
2
sensor, or O
2
sensor
on board, the value will be displayed in percentage (%).
 If Autosave is enabled, “saved” will flash at the top of the display each time the data is
automatically saved to the file.

Press the STOP key to stop the measurement and exit to the Sensor Status display.

Press the LEFT arrow to enter GRAPH Mode.

Press the RIGHT arrow to get to the Measurement Settings menu.
The temperature and relative humidity sensors are located inside the instrument. Therefore, the
temperature sensor is subject to heating by the CI-900 internal electronics.
The temperature
reading is often 4-5
O
C above ambient and in turn, relative humidity readings are affected.
The use of water in Chamber In (PolarCept, see page 7), will also affect relative humidity
readings.
The detection rate (Det. Rate) in nmol/second is calculated by the following formula, based on
ethylene being an ideal gas.
 Detection rate (n’) = (V*P)/(R*T).
 Where volume (V)= flow rate * concentration (L/s)*(ppb) = nL/s

P = pressure (atm) = (kPa)*0.0098692

R= constant = 0.0821

T = absolute t (K)
MONITOR
3.26 ppm
Humidity 47.0%
Temperature 28.7C
Pressure 101.0 kPa
Flow 200 mL
Det Rate 0.03 nmol/s
Uptime 01:17 Bat 95%