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Calibration and Auditing Procedures
Sampler Calibration Frequency
To ensure accurate measurement of the PM10/PM2.5 concentrations, calibrate the sampler upon installation and then recalibrate it as follows:
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At least annually.
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After any repairs that might affect sampler calibration.
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If the field calibration flow check results exceed QC limits (±7% from the sampler's indicated flow rate).
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