Norlab 4-Gas Calibration Gas Mix (H2S, CO, Methane LEL, O2) — 29 Liter

Norlab 4-Gas Calibration Gas Mix — Bump-Test & Calibrate Your Monitor

The Norlab 4-gas calibration gas mix is the consumable behind every reliable portable gas detector — 25 ppm H2S, 100 ppm CO, 50% LEL methane and 18% O2 in a 29-liter cylinder for bump-testing and calibrating any standard 4-gas monitor.

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Norlab 4-Gas Calibration Gas is a 29-liter cylinder of 25 ppm H2S, 100 ppm CO, 50% LEL methane and 18% oxygen for bump-testing and calibrating standard four-gas monitors.

Key features

• Four-gas mix for bump-testing and calibrating O2/LEL/CO/H2S monitors
• Standard concentrations: 25 ppm H2S, 100 ppm CO, 50% LEL methane, 18% O2, balance nitrogen
• 29-liter cylinder for many bump tests per bottle
• Works with any standard 4-gas monitor and a compatible regulator
• The consumable every gas-detection program needs
• From Norlab by Norco, a recognized calibration-gas supplier

Specifications

Where the Norlab 4-Gas Calibration Gas Mix fits

• Daily bump testing before use
• Periodic full calibration
• Confined-space program compliance
• Verifying alarm response
• Fleet calibration of 4-gas monitors

What the Norlab 4-Gas Calibration Gas works with

This mix works with any standard 4-gas (O2/LEL/CO/H2S) monitor — the Forensics 4 Gas Meter, TopTes Guard-101, BW and others. It requires a compatible calibration gas regulator (sold separately) to control flow. It does not fit single-gas-only programs needing a different gas; for those, order the matching single-gas calibration gas. Check the cylinder expiry before use.

Cross-shopping? This unit sits in our Gas Detector Calibration & Accessories hub alongside Fixed-Flow Cal Gas Regulator. For other gas-detection form factors see Portable Gas Detectors, Personal & Wearable Gas Detectors, Fixed Gas Detection Systems, or browse the full Gas Detectors range.

Building a bump-test kit

A complete bump-test kit pairs this 4-gas mix with a flow regulator. Add the fixed-flow calibration gas regulator (0.25 LPM) to control the gas flow to your monitor during bump tests and calibration.

• Order this 4-gas mix as the core consumable for any O2/LEL/CO/H2S monitor program.
• Pair it with the fixed-flow regulator to complete a bump-test kit.
• Apply it to monitors across the Portable Gas Detectors and Personal & Wearable Gas Detectors hubs.

Frequently asked questions

What is in the Norlab 4-gas calibration mix?

25 ppm hydrogen sulfide (H2S), 100 ppm carbon monoxide (CO), 2.5% methane (50% LEL), 18% oxygen (O2) and balance nitrogen — the standard bump-test mix for 4-gas monitors.

What monitors does it work with?

Any standard 4-gas (O2/LEL/CO/H2S) monitor, including the Forensics 4 Gas Meter, TopTes Guard-101, BW and others.

Do I need a regulator too?

Yes — calibration gas needs a compatible flow regulator (sold separately) to control flow to the monitor during a bump test or calibration.

What is a bump test?

A bump test exposes the monitor to a known gas to confirm the sensors and alarms respond. It should be done before each day of use; full calibration adjusts the readings to the gas concentration.

How many bump tests per cylinder?

A 29-liter cylinder provides many bump tests; the exact count depends on flow rate and test duration. Larger fleets may prefer larger cylinders.

Does calibration gas expire?

Yes — calibration gas has a shelf life printed on the cylinder. Use it before the expiry date for accurate results.

How is calibration gas shipped?

As a compressed-gas product it typically ships ground-only; use the Amazon buy button for current availability and shipping details.

Can I use it for single-gas monitors?

This is a four-gas mix. Single-gas-only programs needing a specific gas should order the matching single-gas calibration gas.

How often should I calibrate?

Bump-test before each day of use and perform a full calibration on the manufacturer's schedule or after any failed bump test.

Is Norlab a reputable supplier?

Yes — Norlab by Norco is a recognized calibration-gas supplier, and this is a standard documented 4-gas mix.

Does it work with pumped and diffusion monitors?

Yes, with the right regulator — a fixed-flow regulator suits diffusion monitors; pumped monitors use a demand-flow regulator. See the regulator listing for compatibility.

What gases does it verify?

It verifies the four standard channels — oxygen, combustible LEL (methane), carbon monoxide and hydrogen sulfide — on a 4-gas monitor.