Continuous Mode
When in continuous mode, a graph of the concentration of each gas can be viewed over time. The default graph shown is the ethylene (C2H4) concentration in ppm. To view the graph of the other gases, simply use the up and down arrows to scroll through them. The current gas being graphed is shown on the top of the screen with the concentration in large font as shown below.
The x-axis of the graph is time. The y-axis of the graph displays the range of the concentration (in ppm for ethylene and % for CO2 and O2), and the dynamic range is labeled at the top. 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 gas measured. If the concentration is small, the dynamic range will reflect this.
The graph begins on the left side and moves towards the right as more data points are added. Once the line reaches the right side of the display, the data will begin moving towards the far left, keeping the current time at the far right. The total measurement time is displayed below the graph.
Current Oxygen (% O2), Carbon Dioxide (% CO2) are listed on the right side of the graph when ethylene is being graphed. This data changes slightly when displaying the graph of other gas concentrations. The flowrate (mL/m) is displayed at the bottom. If Relative Humidity (% RH) and Temperature (degrees Celsius) are not seen on the display, go to Setup>RH Conversion and enter the actual temperature of the measurement gas (see page 30).
Controls
From the measurement display screen, press the right arrow to view and change the controls. Access to the controls is only available in Continuous and Trigger measurement modes.
The internal volume inside of the instrument, or “Loop” can be Open or Closed. When the loop is open, the instrument is sampling air from the input at the top of the instrument and exhausting air through the output at the bottom of the instrument. When the loop is closed, air is circulated internally through the tubes and valves to the input and output are closed.
From the control screen, the Pump can be turned On or Off. When the pump is on, the unit will flow at 67 mL per minute, which is the default flow rate. When the pump is off the flow will drop to 0 mL per minute.