Procedure
1. Ensure suitable span source is connected to the Sample Port.
2. Set the span source 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 → Measure - Accept.
6. Let the instrument stabilise, typically 15 minutes.
7. Enter - Span Calibrate O3 - (Enter the reading from the transfer standard) - Accept.
8. Disconnect the span source and reconnect the sample line to the Sample Port.
9. Select - Cal. Mode → Measure - Accept (To return to sample measure).
5.6 Precision Check
Similar to a normal zero or span calibration, a precision check is a Level 2 calibration that may be
performed using a non-certified reference. The instrument is supplied with a known concentration of
span gas (or zero air) and the instrument’s response observed. However, no adjustment to the
instrument response is made during a precision check.
Note: Ensure that the instrument has been running for at least one hour before any calibration is
performed to ensure the sufficient stability.
A precision check can be performed either manually via the Sample Port, Calibration Port or using the
installed option IZS or can also be performed automatically using the Timed Mode (refer to
Section 3.4.10.2).
5.6.1 Zero Precision Check
Equipment Required
• Zero air source
Procedure
1. Supply the instrument with a zero air source (refer to Section 5.4 for the procedure of setting up a
zero, but do not do a Zero Calibrate O3, and continue following below steps).
2. Observe and record the measurement from the instrument.
3. Check readings against user local applicable standards.
4. Select - Cal. Mode → Measure - Accept (To return to sample measure).
If an instrument fails a zero precision check (based on the users local applicable standards), resolve the
issue by referring to Section 7 Zero Drift.
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