5. Calibration
These procedures describe how to calibrate the Span and Zero point for the analyser.
The following sections assume the instrument is in the Calibration Menu.
5.1 Zero Calibration
Zero calibrations are used to set the zero point of the analyser.
Note: This calibration is unnecessary and Ecotech recommends that the zero calibration only be used
when specifically required as it tends to mask issues that should be addressed during
maintenance/service.
A zero calibration can be performed through either the calibration port, background air port or the
sample port. Follow the instructions below:
Calibration Port/Background Air Port
1. Ensure a suitable zero source is connected to the correct port on the back panel of analyser.
2. Set Cal. Type to Manual.
3. Set Cal. Mode to Zero (to indicate that the measurement sample should be drawn from the
Calibration Port).
4. Set Zero Source to External for the calibration port or to Internal for the Background air port.
5. Allow the instrument to stabilise for 15 minutes.
6. Select the Zero Calibration field and enter 0.0 (the gas concentration).
Sample Port
1. Ensure a suitable zero source is connected to the sample port on the back panel of analyser.
2. Set Cal. Type to Manual.
3. Set Cal. Mode to Measure (to indicate that the measurement sample should be drawn from the
Sample Port).
4. Let the instrument stabilise for 15 minutes.
5. Select the Zero Calibration field and enter 0.0 (the gas concentration).
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