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2.2.4 Vacuum Gauge <br /> A vacuum gauge is used to measure the initial vacuum of the canister before sampling and the final <br /> vacuum upon completion. A gauge can also be used to monitor the fill rate of the canister when <br /> collecting an integrated sample. Air Toxics Ltd. provides 2 types of gauges. For grab sampling, a <br /> glycerine gauge is provided for checking initial and final vacuums only and is not to be sampled <br /> through. For integrated sampling a gauge is built into the flow controller and can be used for <br /> monitoring initial and final vacuums, as well as monitoring the fill rate of the canister. In special <br /> cases a pressure/vacuum gauge can be provided upon request. Air Toxic Ltd's gauges are provided <br /> only to obtain a relative measure of"change." Individuals with work plans that outline specific <br /> gauge reading requirements are strongly encouraged to purchase and maintain their own <br /> gauges. <br /> b The gauges that Air Toxics Ltd. provides are for rough estimates only. <br /> Oft <br /> W�� <br /> Table 2.2.3 Fill Times es for Canisters <br /> CANISTER VOLUME 7 micron fitter 2 micron filter <br /> 6 L 16 sec 3 min <br /> - <br /> 1 L 3 sec 30 sec <br /> AIR TOXICS LTD. <br /> 7 <br />