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. 2 - <br /> 3.4 Values measured at less than or greater than 0.9% by volume should not <br /> be considered as quantitative results since accuracy and calibration <br /> checks acs not required by this test at those levels, <br /> 4. EQUIPMENT <br /> 4.1 An inlet test gas Of 10% by volume iso-butane in nitrogen. <br /> 4.2 Flow control valve with a full scale of 20 to 40 standard cubic feet per hour <br /> (scfh). <br /> 4.3 A flow meter with 18.3 scfh full scale range and ± 2% of full scale <br /> accuracy. The meter Must be accurate within 0.4 scfh for any flow setting <br /> made during the prescribed tests. <br /> 4.4 Gasoline resistant hoses, fittings, connectors. <br /> 4.5 Portable NDIR hydrocarbon analyzer, 0 to 1.8 % by volume range <br /> it <br /> to <br /> 18,000 PPM, or 100% lower explosive level (LEL) for iso-butane), with a <br /> minimum accuracy Of t0.1% by volume, such as RKI Instruments "Eagle" <br /> model (with NDIR HC sensor) or equivalent. Only an NDIR analyzer <br /> calibrated to iso-butane may be used for this test. The manufacturer's <br /> Operating instructions for the HC analyzer and Proof or evidence that the <br /> sensor is NDIR shall be kept with the equipment at all times so that proper <br /> Procedure can be verified. <br /> 4.6 Ladder or other access means to manually sample vapor outflow from <br /> top of the Vapor Polisher assembly. the <br /> 4.7 A calibration check gas Of iso-butane in nitrogen or air at a concentration <br /> Of 0.9% by volume (9,000 Ppm or 50% LEL). The calibration check gas <br /> must be certified to an analytical accuracy of±2% traceable to a reference <br /> material approved by the National Institute of Standards and Technology <br /> (NIST) and recertified at least every two years. <br /> 4.8 An inlet test gas Of iso-butane In nitrogen (air balance gas not allowedat <br /> ) <br /> a nominal concentration Of 10% by volume (100,000 PPM). The actual <br /> Value of the gas concentration shall be between 9.7 and 10.3% by volume <br /> (97,000 to 103,000 ppm). The calibration check gas must be certified to <br /> an analytical accuracy of±2% traceable to a reference material approved <br /> by the National Institute of Standards and Technology (NIST) and <br /> recertified at least every two years. <br /> 4.9 Pressure regulators for the calibration check gas cylinder and the inlet test <br /> gas cylinder, <br /> 4.10 Stopwatch with an accuracy Of± 0.2 seconds. <br /> VST Phase If EVIR SYstern, Exhibit 12 - VR-203-E and VR-204-E <br />