72.2 Certified ZAM™ Air, Nitrogen
Engineered to meet 40 CFR Part 72.2 requirements
for Acid Rain CEMS reporting
40 CFR Part 75 calls for a CEMS to be exposed to “zero air material” during testing protocols in order to qualify the accuracy of the instrument. Part 75.21 states that calibration gases used must meet the definitions of 40 CFR Part 72.2 (see back for exact language). Some CEMS users mistakenly use a standard EPA protocol mixture as a zero gas, thinking this will satisfy the Acid Rain requirement. This practice however is risky as it can result in inaccurate CEMS calibration due to biased zero readings arising from contamination in the mix.
Scott EPA Zero Air Material Gases
Achieving a balance between regulatory compliance certainty and cost-effectiveness, Air Liquide offers three types of zero air materials that are guaranteed to be Part 75 compliant.
- 72.2 Certified ZAM Air: Our Scott zero air material is specifically engineered to meet or exceed the regulatory requirements of 72.2 condition (1). Do not confuse this with products that may be marketed by Air Liquide or other manufacturers as “Acid Rain Zero” or “CEM Zero” grades. 72.2 Certified Zero Air has different impurity specifications
- 72.2 Certified ZAM Nitrogen: Some CEMS users prefer to use nitrogen to zero their instruments. In this case however, the nitrogen still must meet the impurity requirements of “zero air material.” Do not confuse this with products that may be marketed by Air Liquide or other manufacturers as “Acid Rain Zero” or “CEM Zero” grades. 72.2 Certified ZAM Nitrogen has different impurity specifications and is engineered to meet or exceed the regulatory requirements of 72.2 paragraph (1)
- 72.2 Certified ZAM RATA Class™ Oxygen EPA Protocol: This gas mixture satisfies the requirements of 72.2 paragraph (4). The oxygen is analyzed and certified to EPA protocol requirements. Since the impurities of 72.2 Certified ZAM Air are analyzed and certified in the cylinder, this cylinder can be used to calibrate an O2 analyzer and to zero CO2, CO, NOx, THC and SO2 analyzers
Click here to view EPA 40 CFR Part 72.2 language pertaining to 72.2 Certified ZAM Air and Nitrogen.
Each ZAM product is analyzed and certified to meet the requirements of CFR 72.2 paragraph (1) for trace SO2, NOx, THC, CO and CO2. By using Air Liquide certified zero products, the risk of faulty calibration due to biased zero readings is eliminated.
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