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i 1 Alarms : 100 ppm 1000 ppm C 10% LEL 19 . 5 02 (Decreasing) 15 . 0 MONITORING EOUI`PMENT - CALIBRATION A. Calibration of the Tank-Techtor should be checked IIII periodically to assure proper response. Frequency of calibration depends on frequency and type of use 1.t1 the instrument receives . As standard procedure, Lt instrument will be calibrated by an authorized service representative every six months . If more frequent calibration is required, trained personnel C will perform calibration on premises, in accordance J with manufacturers specifications . Hexane is , the recommeded calibration gas for the hydrocarbon ranges , since it provides a conservative response representative of total petroleum :hydrocarbon vapors present . Normal fresh C air is used to calibrate the oxygen range. I C. Most hydrocarbon gases or vapors will cause a response on the instrument meter, but may not be direct reading . A hexane calibration provides a conservative reading representative of total petroleum hydrocarbon vapors present . 1� D. Soil contamination by hydrocarbon liquids can be r tested by 'measuring the head space in a closed L� container half-full of soil . This test with any portable gas sensing instrument should be used only as a field indication of whether or not the soil is C contaminated, and a soil sample should be sent to a j laboratory for a more accurate determination of the contamination level . rE. . The standard Tank-Techtor has no response to methane, the major constituent in natural gas . This IiIis generally a desired feature for checking C, soils and vapors to avoid confusing readings if I near a landfill or other methane source. In the non-methane responding mode, the instrument response to methane is completely eliminated, and response to a few other gases or vapors is also reduced or eliminated . In this mode the instrument L still responds well to petroleum vapors such BTEX Lr compounds. 10