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TABLE 2 <br /> Calibration and Maintenance of Field Sampling Equipment <br /> Monitor Type Calibration Method Calibration Frequency Maintenance Schedule <br /> Combustible gas CGI sensor calibrated against CGI span calibrated once per Instrument cleaned as needed <br /> indicator(CGI)/oxygen known concentration of hexane month. CGI zero checked and no less than annually. <br /> meter14 gas meter(02, (demonstration bottle). Zero setting daily. Oxygen sensor changed <br /> LEL,hydrogen sulfide, checked in non-contaminated air. annually and changes if <br /> and carbon monoxide) necessary. <br /> Oxygen sensor calibrated <br /> Oxygen sensor calibrated daily to daily. <br /> 20.9 percent fresh, <br /> non-contaminated air. <br /> Photoionization detector PID zeroed in clean air. Span PID zeroed and span checked Annual cleaning by qualified <br /> (PID) calibrated using known daily at start of work day. technician. Annual calibration <br /> concentration of isobutylene of electronics by qualified <br /> (demonstration bottle). technician. Clean lamp if <br /> sensitivity drops or if used in <br /> very dusty environment. <br /> Draeger tube sampling Check air tightness of pump,time Check daily prior to start of Maintenance required <br /> system for one minute,chain should remain workday. whenever pump fails to pass <br /> slack. If chain taut,then leak test. Replace seals <br /> maintenance required. andlor lubricate per instruction <br /> manual. <br /> Air sampling pump Verify airflow using primary standard Verify airflow prior to and after Minimum of annual cleaning. <br /> (bubble meter)or precalibrated use with sampling head in Clean whenever pump unable <br /> rotameter. place. Spot check flow rate to hold flow rate. <br /> throughout sampling period. Maintenance required if pump <br /> will not hold charge or flow <br /> rate is erratic. <br /> CNCD:dH..4RE'!.C/SP.P'-0OB3.doo 1 of I <br />