5% CO2 Calibration Gas in Nitrogen

While the page content focuses specifically on 5% CO2 calibration gas rather than 5-gas monitors, it notes that CO2 detectors from brands such as Dräger, Honeywell BW, MSA, and RKI require bump testing and calibration with certified mixtures like 5% CO2 in nitrogen. These multi-gas monitoring instruments are typically calibrated using specialty span gases to ensure accurate readings across their detection ranges.

5% CO2 in nitrogen is a standard calibration mixture used to span-calibrate CO2 analyzers, NDIR sensors, and CEMS equipment. It is widely used for EPA Method 3A stack emissions monitoring, PS-3 CEMS calibration, indoor air quality sensor verification, and bump testing of CO2 detectors from brands such as Dräger, Honeywell BW, MSA, and RKI.

Yes. All SpecGas CO2 calibration mixtures, including 5% CO2 in nitrogen, are manufactured using gravimetric blending methods and are fully NIST traceable. Each cylinder ships with a certificate of analysis confirming the certified concentration and traceability chain, meeting requirements for regulatory compliance and accredited laboratory use.

SpecGas offers 5% CO2 in nitrogen in a range of cylinder sizes from 17-liter disposable units up to 250 ft³ refillable cylinders. Both disposable aluminum and steel cylinders as well as refillable aluminum, steel, and nickel-plated cylinders are available to suit portable detector calibration or continuous monitoring station requirements.

Yes. SpecGas specializes in custom gas blending and can produce CO2 in nitrogen at virtually any concentration — from sub-PPB trace levels to percent-level concentrations. Custom single-component and multi-component mixtures are manufactured to customer specifications using proprietary gravimetric production methods with NIST traceability.

Yes. When produced as a NIST-traceable certified reference mixture, 5% CO2 in nitrogen meets the calibration gas requirements for EPA Method 3A, Performance Specification 3 (PS-3) for CO2/O2 diluent CEMS, and 40 CFR Part 98 mandatory greenhouse gas reporting programs applicable to power generation, manufacturing, and refining facilities.

CO2 in nitrogen is a relatively stable mixture. SpecGas applies its proprietary internal cylinder treatment process to further enhance stability and extend shelf life. Typical shelf life ranges from 12 to 36 months depending on cylinder type and storage conditions. The certificate of analysis provided with each cylinder includes the recommended use-by date.