F-900 Instruction Manual 8/14/2017
1554 NE 3
rd
Ave, Camas, WA 98607, USA Phone: (360) 833-8835
15
www.felixinstruments.com
Figure 10: Graph Mode with red arrow indicating direction of movement.
Directly below the graph is the current ethylene value. Above the graph is the dynamic range
(on the left it is 1.000 ppm, on the right it is 2.000 ppm). The y-axis scale is set by the highest
value shown in the buffer. This range will scale vertically, dependent on the highest
concentration of ethylene measured. If the concentration is small, the dynamic range will reflect
this. For example, the initial value was 0.162 ppm and there is a sudden peak to 7.578 ppm. As
the spike or peak occurs, the graph will scale to 10.000 ppm. If the sample returns to 0.168
ppm, the scale will remain at 10.000 ppm until the graph and the buffer are cleared.
The scale of the graph can be increased or decreased by using the up and down arrows.
Pressing the up arrow will zoom in on the data, minimizing the visible range. Using the down
key will increase the scale, up to 200 ppm. Note that the minimum range of data visible (down to
0.150 ppm) depends on the current data being graphed. For example, if the current data is
3.486 ppm, the user may use the up key to zoom in to the 5 ppm range, but cannot zoom in to a
narrower 2 ppm range.
The graph begins on the left side and moves with the vertical line towards the right as more data
points are added. Once the time line reaches the right side of the display, the data will be
compressed to the far left.
The time scale relates directly to the vertical position line. In other words, the line moves to the
right as new data points are added. Every time a data point is added, the time scale is
incremented. For time under 10 minutes, the graph is updating almost every second. The
bottom of the display shows the uptime of the F-900 and current battery level.
Monitor Mode
The large bold value on the top line is the digitally filtered value of the raw
ethylene
measurements. Next, the relative
humidity
in percent, of the gas stream in the instrument is
displayed followed by the
temperature
in degrees Celsius. The atmospheric
pressure
, is
displayed. Press the down arrow to view the
flow
rate in milliliters per minute. The default flow
rate is 80 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 (%).
Summary of Contents for F-900
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