5.5.1 Calibration Port
Equipment Required
• Span source
Procedure
1. Refer to Figure 118. Ensure a suitable span source is connected to the Calibration Port.
Figure 118 – Span Calibration Set-up - 1
2. If diluting the gas with a dilution calibrator, set the output concentration to 80% of the instrument
measurement range.
3. Open - Main Menu → Calibration Menu.
4. Select - Cal. Type → Manual - Accept.
5. Select - Cal. Mode → Span - Accept.
6. Let the instrument stabilise, typically 15 minutes.
7. Enter - Span Calibrate CO - (Enter the span output concentration) - Accept.
8. Select - Cal. Mode → Measure - Accept (To return to sample measure).
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