2. Open - Main Menu → Calibration Menu.
3. Select - Cal. Type → Manual - Accept.
4. Select - Cal. Mode → Measure - Accept.
5. Select - Zero Source → External - Accept.
6. Allow the instrument time to achieve a stable response.
7. Enter - Zero Calibrate CO - (read note) - OK.
8. Disconnect the zero air source and reconnect the sample line to the Sample Port.
5.4.3 Background Air Port
Equipment Required
• N/A
Procedure
1. Open - Main Menu → Calibration Menu.
2. Select - Cal. Type → Manual - Accept.
3. Select - Cal. Mode → Zero - Accept.
4. Select - Zero Source → Internal - Accept.
5. Allow the instrument time to achieve a stable response.
6. Enter - Zero Calibrate CO - (read note) - OK.
7. Select - Cal. Mode → Measure - Accept (To return to sample measure).
5.5 Span Calibration
A span calibration is a calibration performed at the upper end of the instrument’s measurement range.
Ecotech recommends calibration at 80% of the full scale measurement or operating range of the
instrument.
While the instrument range is commonly set as a default 0 - 50 ppm, this is widely recognised as no
longer being valid with modern digital communication and most regulators will now recommend a
range more suited to local conditions.
A span gas can be supplied through either the Calibration Port or Sample Port. Refer to the instructions
outlined in the next two sections.
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