Controller Software for Calibration

The F-900 Controller software is designed to make calibration quick and easy, with many automated features. (Requires latest version of Java). A major advantage of using the F-900 Controller software to calibrate the sensors is that all calibration parameters are updated and saved in the F-900, including calibrated RH, calibrated T, and internal gain. Additionally, compensation for temperature and relative humidity are automatically applied, based on the internal sensors of the F-900. The F-900 Controller software is primarily used for the C₂H₄ PPB sensor span calibration, which is recommended weekly.

Other sensors on the F-900 can be calibrated using the F-900 Controller software. The calibration of the RH sensor requires an external relatively humidity sensor. Each sensor must have the zero calibration set before carrying out the span calibration. This can be carried out with KMnO₄ and the “set zeros” calibration for ethylene, or for “set zero” of CO₂ and O₂ sensors by using N₂ gas and the F-900 Controller software (step #1 in the F-900 Controller software Calibration tab).

The CO₂ PCT is calibrated at 3 known points and 0 ppm to provide the greatest accuracy for the 0-20% range. When recalibrating the CO₂ PCT sensor, choose the expected or desired range and calibrate with the recommended concentration. If using the 0-100% CO₂ range, values above 20% are extrapolated and not measured due to the limitation of the sensor range. Verify with CO₂ gas within expected range. The following table indicates what concentration of calibration gas is used at Felix Instruments for each sensor.

Table 1: F-900 Standards Needed for each Sensor.

Can use ambient air instead of purchasing 21% (O₂) gas