Calibration Gas for 4 Gas Monitors

Most manufacturers and OSHA guidelines recommend calibrating a 4 gas monitor at least every 6 months, though many safety programs require monthly or even daily calibration verification. Bump testing — a quick exposure to calibration gas to confirm sensor response — should be performed before each use in hazardous environments. Always defer to your specific instrument's manufacturer guidelines and your organization's safety protocols.

Standard 4 gas monitors typically detect four hazards simultaneously: Carbon Monoxide (CO), Hydrogen Sulfide (H₂S), Oxygen (O₂) for both deficiency and enrichment, and combustible gases measured as a percentage of the Lower Explosive Limit (LEL) — commonly methane or propane. Some monitors can be configured with alternative sensors for gases such as ammonia, chlorine, or sulfur dioxide depending on the specific work environment.

SpecGas Inc. offers calibration gases at low PPM, PPB, and mid-PPM to percent concentration levels depending on the gas type. For example, CO and H₂S are typically available at low PPM levels, while combustible gas LEL standards and O₂ mixtures are available at custom and percentage concentrations. Custom blends can be tailored to your monitor manufacturer's exact specifications.

Yes. SpecGas Inc. specializes in custom multi-component gas blends blended in-house to your exact specifications. Whether your monitor requires a specific combination of CO, H₂S, O₂, and methane or a less common gas combination, SpecGas can produce a NIST-traceable mixture with adaptable tolerances and fast turnaround times. Contact the team for a consultation.

SpecGas calibration gases are compatible with most major 4 gas monitor brands and models. Gases are blended to NIST traceable standards and can be customized to match the concentration requirements specified by monitor manufacturers such as Industrial Scientific, MSA, Honeywell, Draeger, and others. Confirm your instrument's inlet specifications and required concentrations when placing your order.

SpecGas offers calibration gases in disposable steel and aluminum cylinders (17–103 liters), refillable aluminum and steel cylinders (up to 250 ft³), and nickel-plated cylinders for reactive gases. Disposable cylinders are ideal for field use and overseas shipping. Cylinder size and type availability varies by gas; contact SpecGas for options suited to your application and usage volume.