RKI Instruments 81-0012RK-21 Methane 25% LEL Calibration Gas - 1.25% vol. (CH4)

By RKI Instruments Equivalent


Balance Gas: Air

Size: 34LS


  • RKI Instruments equivalent 1.25% vol. Methane 25% LEL (CH4) span gas cylinder used to calibrate RKI gas detection equipment with methane 25% lel gas sensors.
  • Fully compatible with RKI Instruments gas detectors requiring 1.25% vol. methane 25% lel with balance air.
  • Precision blended and inspected to industry standards - National Institute of Standards and Technology (NIST) traceable and certified.
  • Made in the USA by GASCO, ISO 9001:2008 Certified.

Contact us for custom methane 25% lel calibration gas mixtures.

Subject to hazardous materials shipping requirements.

Technical Specs

Target Gas: Methane 25% LEL (CH4)
Concentration: 1.25% by volume
Balance Gas: Air
Gas Type: Non-Reactive
Cylinder Size: 34LS
Part Numbers:
RKI Part Number: 81-0012RK-21
GASCO Part Number: 34LS-135A-1.25
Manufactured by: Gasco Affiliates, LLC
Shelf Life: 48 Months
Regulator Compatibility: CGA 600 valve inlet.

Control Valve (CV-2)
Fixed Flow (70 Series)
Demand Flow (75-DFR)
Dial-a-Flow (74-DAF)
Fixed Flow Push Button (73-PBR)
Trigger Control Fixed Flow (70-Trigger)
Flow Matching Valve (72-MFV)

Tubing Compatibility: Tygon® Tubing

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