Touchscreen Operation 4-19
After zeroing, a status is displayed for each connected pressure sensor to indicate the result of the
zero process. The pressure sensors can be zeroed more than once by you while in the Zero Pressure
Sensors screen. Press the DONE button to return to the C dashboard screen.
Note that the barometric pressure sensor (used for absolute pressure measurements) does not require
zeroing and; therefore, this sensor is not displayed in the Zero Pressure Sensors screen.
Calibrate Oxygen Sensor
An oxygen sensor can be connected to the 4081 High Flow Module to provide real-time oxygen
concentration measurements. TSI
®
recommends the oxygen sensor be field calibrated on a daily basis
as well as after replacing the oxygen sensor cell or after a change in altitude.
To field calibrate an oxygen sensor, perform the following steps:
1. Power up the Plus Test system with the high flow module and oxygen sensor
connected, and allow one minute for the Flow Analyzer to warm up.
2. On the Certifier display, press the Menu icon and select the Settings option. From the Settings
screen, select the Oxygen Sensor option.
3. In the Oxygen Sensor screen, the Flow Analyzer will display any connected oxygen
sensors. Press the Calibrate button and follow the on-screen directions to complete the
calibration process.
done. The two point air and 100% oxygen calibration provides the best accuracy.
The numeric value displayed during the stabilization process does not necessarily represent the
actual oxygen concentration. This numeric stabilization value is there for you to determine if it is
changing or not. Once the reading stops changing then it is time to advance to the next step in
the oxygen sensor calibration process.
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