🔍 Click to zoom
Norlab 4-Gas Calibration Gas Mix — Bump-Test & Calibrate Your Monitor
$165.00
Final price set by Amazon · may vary
EDITORIAL REVIEW: 4.6/5 — WC Safety Review of the Norlab 4-Gas Calibration Gas, the consumable behind a reliable monitor. Editorial assessment by Steven Eaton, WC Safety editor, based on published Norlab specificati...
Check Price on Amazon🔒 Amazon Associate · You pay the same price · We earn a small commission
Zero Sponsored ListingsNo paid placements. Rankings are never sold or influenced by manufacturers.
Independent Product ResearchBuilt from manufacturer specifications, published standards information, and cited sources
Standards MatterRatings and markings vary by model and variant — verify the manufacturer’s documented rating for your hazard
Built for Industrial BuyersResearch written for safety managers, procurement teams, and field supervisors.
EDITORIAL REVIEW: 4.6/5 — WC Safety Review of the Norlab 4-Gas Calibration Gas, the consumable behind a reliable monitor.
Editorial assessment by Steven Eaton, WC Safety editor, based on published Norlab specifications and category fit. We did not laboratory-test this product.
Editorial assessment by Steven Eaton, WC Safety editor, based on published Norlab specifications and category fit. We did not laboratory-test this product.
The Norlab 4-Gas Calibration Gas Mix is a 29-liter cylinder of 25 ppm H2S, 100 ppm CO, 50% LEL methane and 18% oxygen (balance nitrogen) for bump-testing and calibrating standard four-gas monitors — the calibration consumable that keeps a gas monitor accurate; it is not a detector or respiratory protection.
CHECK PRICE ON AMAZON → SHOP CALIBRATION ACCESSORIES →
As an Amazon Associate, WC Safety earns from qualifying purchases.
Why the Norlab 4-Gas Calibration Gas keeps a monitor honest
A four-gas monitor is only trustworthy if it is bump-tested before use and calibrated on schedule — and that takes a cylinder of known gas. The Norlab 4-Gas mix is that consumable: 25 ppm H2S, 100 ppm CO, 50% LEL methane and 18% oxygen (balance nitrogen) in a 29-liter cylinder, the standard concentrations for verifying an O2/LEL/CO/H2S monitor, good for many bump tests per bottle. As gas detector calibration accessories go, this is the standard 4-gas cal-gas pick, and the gas detection guide and the best 4-gas monitor guide explain where it fits. It is the consumable behind every reliable four-gas monitor.
Safety first: calibration gas verifies a monitor; the monitor still is not respiratory protection. In an IDLH or oxygen-deficient atmosphere you must evacuate and use supplied-air or an SCBA — a bump-tested monitor warns of the hazard, it does not protect. Use the correct regulator and cap, do not use expired gas for a valid calibration, and store the cylinder upright away from heat and ignition per the manufacturer and local code.
What the Norlab 4-Gas Calibration Gas listing documents
From the published specs: a four-gas mix for bump-testing and calibrating O2/LEL/CO/H2S monitors; standard concentrations of 25 ppm H2S, 100 ppm CO, 50% LEL methane, 18% O2 (balance nitrogen); a 29-liter cylinder for many tests; and compatibility with a standard 4-gas monitor and regulator. These are true 4-gas calibration gas and bump test gas credentials in a span gas cylinder. Confirm the concentrations, regulator, and expiration on the listing.
How the Norlab 4-Gas Calibration Gas fits your monitors
Use it to bump-test and calibrate a compact 2-year 4-gas like the BW Clip4, a datalogging workhorse like the GasAlertMicroClip XL, a compact certified unit like the RKI GX3R, a value color-screen 4-gas like the TopTes Guard-863Pro, or a confined-space meter like the Forensics 4-Gas Meter. The best 4-gas monitor guide and the 4-gas vs single-gas guide cover the monitors it services.
Choosing the right calibration gas
Match the gas mix and concentrations to the monitor and sensors you run. Browse the gas detectors, 4-gas monitors, and personal gas detectors collections; for the monitors it services, the portable gas detectors collection; and for the personal-monitor decision, the personal monitor guide, the calibration accessories collection, and the confined space equipment collection.
Where it fits by job and crew orders
The Norlab 4-Gas Calibration Gas suits any gas-detection program that runs O2/LEL/CO/H2S monitors and must bump-test before each use and calibrate on schedule — see the gas detection guide and the industrial CO guide for the monitors and programs it supports. Keeping cal gas on hand is what turns "we have monitors" into "our monitors are verified." Confirm the concentrations, the correct regulator, and the expiration date on the listing, and store the cylinder safely. For crew orders, quantity purchasing runs through a free Amazon Business account — volume pricing, PO numbers at checkout, and tax-exempt eligibility for qualifying organizations, with the walkthrough linked in our footer.
Frequently asked questions
What is the Norlab 4-Gas Calibration Gas Mix?
A 29-liter cylinder of 25 ppm H2S, 100 ppm CO, 50% LEL methane and 18% oxygen (balance nitrogen) for bump-testing and calibrating standard four-gas monitors.
What is in the mix?
The listing states 25 ppm hydrogen sulfide (H2S), 100 ppm carbon monoxide (CO), 50% LEL methane and 18% oxygen, balance nitrogen - the standard concentrations for a four-gas O2/LEL/CO/H2S monitor. Confirm the concentrations on the listing.
Is this a gas detector?
No - it is the calibration gas used to test and calibrate a gas monitor, not a detector. You apply it to a four-gas monitor to verify the sensors respond correctly. Confirm compatibility on the listing.
What is a bump test?
A bump test briefly exposes a monitor to a known gas concentration to confirm the sensors and alarms respond before use. Most gas-detection programs require it before each use of a monitor.
What is calibration?
Calibration adjusts a monitor's readings against the known concentrations in the cal gas, so it reads accurately. It is done on the manufacturer's schedule, more thoroughly than a bump test.
Is calibration gas respiratory protection?
No - it is a test consumable for verifying a monitor. A monitor itself is not respiratory protection, and neither is the gas that tests it. Confirm your program's requirements.
Do I need a regulator?
Yes - the listing states it works with a compatible regulator, which controls the flow from the cylinder to the monitor. Confirm the correct regulator for this cylinder on the listing; it is typically sold separately.
How many tests per cylinder?
The 29-liter cylinder provides many bump tests per bottle; the exact number depends on your flow rate and test duration. Confirm the yield on the listing.
Which monitors does it work with?
Any standard four-gas monitor reading O2, LEL, CO and H2S, with a compatible regulator and calibration cap. Confirm your monitor and regulator compatibility on the listing.
Does calibration gas expire?
Yes - calibration gas has an expiration date, after which the concentrations may drift. Confirm the shelf life on the listing and do not use expired gas for a valid calibration.
How do I store it?
Store the cylinder upright in a cool, well-ventilated area away from heat and ignition sources, per the manufacturer and local code, and check the expiration date before use.
How do I order for a crew?
Quantity purchasing runs through a free Amazon Business account - volume pricing, PO numbers at checkout, and tax-exempt eligibility for qualifying organizations. The bulk-ordering walkthrough is linked in our site footer.
Read our detailed Norlab 4-Gas Calibration Gas Mix review — strengths, limitations, and the alternatives that matter.
Brand / Vendor
Norlab
Model / SKU
B011T9OKRE
Product Type
Gas Detection Accessory
Price
$165.00 (Amazon)
Rating
4.6 / 5 — 7 Amazon ratings
Availability
Check current availability on Amazon
No Paid Placements
Every product earns its place on documented safety credentials and specifications — never advertising spend.
Industrial Grade Only
Coverage focuses on equipment built for professional use in manufacturing, construction, and industrial environments.
Independent Product Research
Product information is compiled from manufacturer specifications, published standards information, compatibility data, and other cited sources.
Affiliate Disclosure
WC Safety may earn commissions from qualifying purchases made through affiliate links. Affiliate relationships never change the specifications presented.
Verified Buyer Reviews
Customer Reviews
★★★★★4.6 / 5· 7 ratings on Amazon
★★★★★
Would buy again...
Great price, got here quick, and calibration gas-mix points consolidate with factory settings of most H2S monitors.
Verified Purchaser · April 25, · ✓ Amazon Verified Purchase
Showing 1 of 7 Amazon reviews.
Share Your Experience
Write a Review
Thank you for your review!
Your submission has been received and will be published after verification.
Frequently Asked Questions
What is the Norlab 4-Gas Calibration Gas Mix?
A 29-liter cylinder of 25 ppm H2S, 100 ppm CO, 50% LEL methane and 18% oxygen (balance nitrogen) for bump-testing and calibrating standard four-gas monitors.
What is in the mix?
The listing states 25 ppm hydrogen sulfide (H2S), 100 ppm carbon monoxide (CO), 50% LEL methane and 18% oxygen, balance nitrogen - the standard concentrations for a four-gas O2/LEL/CO/H2S monitor. Confirm the concentrations on the listing.
Is this a gas detector?
No - it is the calibration gas used to test and calibrate a gas monitor, not a detector. You apply it to a four-gas monitor to verify the sensors respond correctly. Confirm compatibility on the listing.
What is a bump test?
A bump test briefly exposes a monitor to a known gas concentration to confirm the sensors and alarms respond before use. Most gas-detection programs require it before each use of a monitor.
What is calibration?
Calibration adjusts a monitor's readings against the known concentrations in the cal gas, so it reads accurately. It is done on the manufacturer's schedule, more thoroughly than a bump test.
Is calibration gas respiratory protection?
No - it is a test consumable for verifying a monitor. A monitor itself is not respiratory protection, and neither is the gas that tests it. Confirm your program's requirements.
Do I need a regulator?
Yes - the listing states it works with a compatible regulator, which controls the flow from the cylinder to the monitor. Confirm the correct regulator for this cylinder on the listing; it is typically sold separately.
How many tests per cylinder?
The 29-liter cylinder provides many bump tests per bottle; the exact number depends on your flow rate and test duration. Confirm the yield on the listing.
Which monitors does it work with?
Any standard four-gas monitor reading O2, LEL, CO and H2S, with a compatible regulator and calibration cap. Confirm your monitor and regulator compatibility on the listing.
Does calibration gas expire?
Yes - calibration gas has an expiration date, after which the concentrations may drift. Confirm the shelf life on the listing and do not use expired gas for a valid calibration.
How do I store it?
Store the cylinder upright in a cool, well-ventilated area away from heat and ignition sources, per the manufacturer and local code, and check the expiration date before use.
How do I order for a crew?
Quantity purchasing runs through a free Amazon Business account - volume pricing, PO numbers at checkout, and tax-exempt eligibility for qualifying organizations. The bulk-ordering walkthrough is linked in our site footer.