GASCO 34L-421 Calibration Gas

The GASCO 34L-421 Calibration Gas is a high-quality gas mixture designed for calibrating and maintaining gas detectors and sensors. This 34-liter aluminum cylinder contains a precise blend of gases to ensure accurate calibration.

Features

• High Accuracy: Meets or exceeds the requirements of original gas detection equipment manufacturers.
• Versatile Use: Suitable for all gas detectors.
• Quality Assurance: Made in the USA with a Certificate of Analysis (COA) included.
• Convenient Size: 34-liter cylinder for easy handling and storage.
• Gas composition: 100 PPM CO, 50% LEL Methane (2.5% CH₄), 25 PPM H₂S, 18.0% O₂, balance Nitrogen.
• NIST traceability: Ships with a Calibration Certificate (NIST‑traceable) for documented accuracy.
• Cylinder format: 34 L aluminum alloy cylinder, 500 psi service pressure, compact and field‑portable.
• Standard connection: C‑10 (5/8"-18 UNF) valve for broad regulator compatibility.

What is it?

GASCO 34L‑421 is a quad‑mix calibration gas designed to perform span calibrations and bump tests on multi‑gas detectors that monitor CO, combustible gas (CH₄/LEL), H₂S, and O₂. The mixture and concentration values are NIST‑traceable, supporting reproducible, audit‑ready calibrations for mission‑critical gas detection

How is it used?

1. Attach a C‑10 compatible regulator (fixed‑flow or demand‑flow) to the 34 L cylinder.
2. Connect the regulator tubing to the instrument’s calibration cap.
3. Apply gas to verify sensor response and alarms (bump test) or to adjust instrument readings to the certified values (span calibration) per your detector manual.
4. (34 L cylinders with C‑10 connections are standard across OEM test setups; GASCO specifies C‑10 on this model and provides NIST certification for use during calibration.)

Who uses it?

• Fire service and HAZMAT teams validating detectors before entry or leak investigations
• Utility & pipeline crews performing LEL/CO/H₂S/O₂ checks
• Industrial hygiene & EHS staff conducting routine instrument maintenance
• The gas is compatible with any OEM gas detector requiring these target gases and a C‑10 supply.

Maintenance information

• Storage: Keep cylinders cool, dry, and ventilated; protect from heat/sparks and direct sun per compressed‑gas best practices. (General calibration‑gas handling guidance is standard OEM practice; GASCO cylinders are non‑refillable.)
• Traceability records: Retain the NIST COA, track lot/expiration (included on GASCO cylinders) for QA and audits.
• Regulator care: Inspect C‑10 threads/O‑rings; use compatible fixed‑flow or demand‑flow regulators.
• Intervals: Follow your detector manufacturer’s bump‑test and calibration cadence; perform a full calibration if a bump test fails.

What is it used with?

C‑10 regulators (fixed‑flow, Dial‑A‑Flow, or demand‑flow) and multi‑gas detectors that measure CO/LEL/H₂S/O₂. The C‑10 (5/8"-18 UNF) outlet on the 34 L cylinder is a common standard across portable test setups