F-900 Instruction Manual rev. 1/16/2014
1554 NE 3
rd
Ave, Camas, WA 98607, USA Phone (360) 833-8835 Fax (360) 833-1914
[email protected] http://www.felixinstruments.com
17
Setup Menu
The F-900 has a number of utility functions that allow the user to manage the instrument’s
capabilities. These functions are accessed by pressing the RIGHT arrow when Setup is highlighted
on the Main Menu. The setup utility options are: Autosave, Sensor, Time, Flow, Chamber, Terminals
and Board. Use the UP/DOWN arrows to select the desired option and then press the RIGHT arrow
to enter the choice. Press the LEFT arrow to exit to the Main Menu.
Setup Measure
The Setup Measure menu allows the user to setup a measurement in 1 of 2 different modes:
Monitor Mode or GC Emulation Mode. Instructions to use Monitor Mode are found in a separate
section in this manual. GC Emulation Mode is only available with the F-900 field kit.
Setup GC Emulation Mode
To use the F-900 to analyze a small sample in a syringe, the GC Emulation Mode should be used.
With the simple addition of our inline injection port, small volumes of analyte can be accurately
measured.
The GC emulation mode employs a patent pending Flow Inject Analysis method to determine
ethylene concentrations ranging from 0.5-200ppmv with sample volumes from 3-13mL. Just like a
GC a simple estimation, accurate up to +/-0.1ppmv, is made by comparing the area counts of the
unknown sample to a known concentration. As shown by Equation 1, the injection volume is
determined by the expected concentration of ethylene and the detection limits of the sensor. If
interfering gases are expected, their expected concentrations must be added to the expected
ethylene concentration.
Equation 1:
0.2𝑝𝑝𝑚𝑣 ≥
𝐼𝑛𝑗𝑒𝑐𝑡𝑖𝑜𝑛 𝑉𝑜𝑙𝑢𝑚𝑒∗𝐸𝑥𝑝𝑒𝑐𝑡𝑒𝑑 𝐸𝑡ℎ𝑦𝑙𝑒𝑛𝑒 𝐶𝑜𝑛𝑐𝑒𝑛𝑡𝑟𝑎𝑡𝑖𝑜𝑛
30𝑚𝐿
≥ 20𝑝𝑝𝑚𝑣
Exceeding the lower limit of Equation 1 will decrease the accuracy and precision of the result.
Exceeding the upper limit will affect the sensitivity of the instrument and will cause the instrument
to under-estimate measurements for up to 24 hours. A new calibration point may be required.
Setup Menu
Measure
Autosave
Sensor
Calibration
Time
Flow
Chamber
Terminals
Board
