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Sampling at altitude also affects gauge readings. The gauges supplied by Air Toxics Ltd. (see Section <br /> 2.2.4) measure canister vacuum relative to atmospheric pressure and are calibrated at approximately <br /> sea level. Before sampling at altitude, the gauges should be equilibrated (see Section 3.1). But even <br /> after equilibrating the gauge, verifying the initial vacuum of a canister at altitude is misleading. In <br /> Denver. at 5,000 ft, expect the gauge to read 25, not 29.9 in. Hg. You do not have a bad canister(i.e., <br /> leaking or not evacuated properly).The canister is ready for sampling and the gauge is working <br /> properly. <br /> Rule of Thumb: For every 1,000 ft of elevation, the gauge will be <br /> off by 1 in, Hg and the fill volume will be reduced by 1/5 L. <br /> If you have questions about sampling at altitude, please call Client Services at 800-985-5955. <br /> 25 In. H'q ' aeWar <br /> (0111WOPPA at-sea <br /> 61 evacusoor nct r <br /> „" Maxinturn lilt voluefte of <br /> t <br /> fill Bandar,%air a� ti ipa <br /> o a final gai <br /> Fc air.of r t,, �i <br /> MOM h�10:I psi Allil l k' mean 4,'tr, to; <br /> tea " of sampie -1 ,§ + ll1 <br /> 25 <br /> k H <br /> t22 Pal (.max fill OP <br /> t . psi <br /> "6 <br /> 27A in, <br /> 5L max lit* <br /> (2 R) x <br /> In l <br /> OR max lir, <br /> i ll Rule ofi ll� s <br /> r y 1 im f <br /> and rnw4 fe vauttie ise- <br /> . t.per 1000R l : :n, <br /> 22 <br />