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d <br /> I� <br /> AIR MONITORING EQUIPMENT CALIBRATION AND MAINTENANCE <br /> - All monitoring instruments must be calibrated and maintained periodically The <br /> limitations and possible sources of errors for each instrument must be understood by <br /> the operator It is important that the operator ensures that the instrument responds <br /> properly to the substances it was designed to monitor On-site personnel will follow <br /> the manufacturer's directions for calibration and maintenance of PIDs <br /> _ explostmeters, and scintillometers <br /> a - � <br /> I� <br /> A <br /> I <br /> r <br /> r <br />