2026-10-29

How to Ensure Accuracy and Repeatability of Online Photocatalytic Gas Analysis Data? Calibration and Verification Checklist | Perfectlight

1. Accuracy and Repeatability Are Two Different Things

Accuracy means the measured value is close to the true value (via standard-gas response-factor calibration); repeatability means multiple measurements under the same conditions are consistent (via programmatic automatic injection). The advantage of online systems is mainly in repeatability, but accuracy still needs manual calibration as a safeguard.

2. Calibration Workflow Checklist

Build a peak-area–amount-of-substance curve with known-concentration standard gas;
Cover the actual range with multiple concentration points;
Calibrate once before and after each long experiment to monitor drift.

3. Quality Control (QC) Practices

Include a blank and a parallel sample per batch;
Record injection volume, carrier-gas flow, and column temperature;
Use the PL-MW2000 High-Intensity Light Power Meter to synchronously record sample-position light intensity as a rate-normalization baseline.

4. Common Deviation Sources

Source	Manifestation	Countermeasure
Leakage	Systematically low yield	Positive-pressure leak test
Response-factor drift	Value shift	Periodic standard-gas re-check
Uncalibrated light intensity	Non-comparable rates	Sample-position calibration

Free consultation: Always just short of solid data? Perfectlight turns the μGAS1001 online analysis and light-intensity calibration into an auditable QC workflow, making your data directly publishable.

Tel: 400-1161-365 / 010-62128921　Perfectlight Official Website

Frequently Asked Questions (FAQ)

Are accuracy and repeatability the same?

No. Accuracy relies on standard-gas calibration; repeatability relies on programmatic automatic injection; the online advantage is mainly in repeatability.

How should QC be done?

Include a blank and parallel sample per batch, record injection volume and column temperature, and use the PL-MW2000 to synchronously record light intensity for normalization.

Where do data deviations come from?

Leakage, response-factor drift, and uncalibrated light intensity are the three main causes.

This article does not constitute a performance commitment; specific technical parameters are subject to the actual product documentation and mutual confirmation.

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