4-Gas Calibration Gas – RKI Equivalent – H₂S 25 / CO 50 / CH₄ 50% LEL / O₂ 12%

The CPS Calibrations 4-Gas Calibration Gas – RKI Equivalent is a precision calibration gas mixture designed for the calibration and bump testing of compatible portable and fixed gas detection instruments.

This mixture contains 25 ppm Hydrogen Sulfide (H₂S), 50 ppm Carbon Monoxide (CO), 50% LEL Methane (CH₄), and 12% Oxygen (O₂), with Nitrogen (N₂) balance.

Available in multiple cylinder sizes, this mixture provides a cost-effective alternative for users requiring calibration gas with concentrations equivalent to commonly used RKI Instruments calibration gas configurations.

Each cylinder includes a QR code for convenient access from a smartphone or other compatible device to the cylinder-specific Safety Data Sheet (SDS) and Certificate of Analysis (COA).

Calibration gas is NIST traceable and produced under quality systems supporting accurate and reliable gas detector calibration.

Equivalent RKI Instrument Cylinder References:

• 81-0154RK-04 – 34L equivalent
• 81-0154RK-02 – 58L equivalent
• 81-0154RK-116 – 116L equivalent

Important: CPS Calibrations calibration gas is an aftermarket equivalent product and is not manufactured by RKI Instruments. RKI Instruments names and part numbers are used only as compatibility references.

Mixture: 25 ppm Hydrogen Sulfide (H₂S) / 50 ppm Carbon Monoxide (CO) / 50% LEL Methane (CH₄) / 12% Oxygen (O₂) / Nitrogen Balance
Cylinder Sizes: 34L, 60L & 120L
Connection: C-10
Shelf Life: 24 Months
Country of Manufacture: USA

11 Liter Minimum Order: The 11 Liter cylinder must be ordered in a minimum quantity of 6 cylinders.