Gasco Calibration Gas — Complete Cross-Reference Guide
If you currently use Gasco calibration gas and want the Trigas USA equivalent — direct, certified, and shipped fast — this guide maps common Gasco part numbers to ours. Because Trigas USA manufactures with the same industry part-numbering convention, your Gasco part number is our part number: same gas, same concentration, same cylinder and connection. The gas we supply is produced by laboratories accredited to ISO/IEC 17025:2017 and ISO 17034:2016, and every cylinder ships with a NIST-traceable Certificate of Analysis.
Shortcuts: Browse all disposable calibration gas · Find your part number · All OEM cross-references
Trigas USA is independent and not affiliated with Gasco. “Gasco” is referenced only to help you identify the equivalent product.
Single-gas mixtures
| Gasco part # | Gas | Concentration / balance | Size | Trigas USA equivalent |
|---|---|---|---|---|
| Gasco 34L-50-100 | Carbon Monoxide | 100 ppm / air | 34L | 34L-50-100 |
| Gasco 34L-98-25 | Hydrogen Sulfide | 25 ppm / N₂ | 34L | 34L-98-25 |
| Gasco 34L-161-18 | Oxygen | 18% / N₂ | 34L | 34L-161-18 |
| Gasco 34L-135A-2.5 | Methane | 2.5% vol (50% LEL) / air | 34L | 34L-135A-2.5 |
| Gasco 34L-111-400 | Nitrogen Dioxide | 400 ppm / N₂ | 34L | 34L-111-400 — Nitrogen 400 ($220) |
| Gasco 34L-175-20 | Sulfur Dioxide | 20 ppm / N₂ | 34L | 34L-175-20 |
| Gasco 34L-13-25 | Ammonia | 25 ppm / N₂ | 34L | 34L-13-25 |
Most mixtures are also available in 17L, 58L, 105L and 116L — the size prefix changes, the gas code stays the same.
Four-gas (quad) mixtures
| Gasco part # | Mixture | Size | Trigas USA equivalent |
|---|---|---|---|
| Gasco 34L-421 | 100 ppm CO / 25 ppm H₂S / 50% LEL CH₄ / 18% O₂ / N₂ | 34L | 34L-421 |
| Gasco 58L-421 | 100 ppm CO / 25 ppm H₂S / 50% LEL CH₄ / 18% O₂ / N₂ | 58L | 58L-421 |
| Gasco 116L-421 | 100 ppm CO / 25 ppm H₂S / 50% LEL CH₄ / 18% O₂ / N₂ | 116L | 116L-421 |
Specialty & reactive mixtures
| Gasco part # | Gas | Concentration / balance | Trigas USA equivalent |
|---|---|---|---|
| Gasco 34L-252-10 | Chlorine | 10 ppm / N₂ | 34L-252-10 |
| Gasco 34L-HCN-10 | Hydrogen Cyanide | 10 ppm / N₂ | 34L-HCN-10 |
| Gasco 34L-125-25 | Nitric Oxide | 25 ppm / N₂ | 34L-125-25 |
Equivalents by detector brand
Trigas USA equivalents are available for the most common portable detectors: MSA (Altair 4X/5X), BW Technologies / Honeywell (GasAlert Quattro, Micro Clip, BW Clip), Industrial Scientific (MX6, Ventis MX4), RKI Instruments (GX-3R, GX-6000), Draeger (X-am 5000/2500), RAE Systems (MultiRAE, MiniRAE), and Crowcon (Clip, T4).
Will my calibration records stay valid?
Yes. OSHA and EPA requirements specify the gas concentration and traceability — not the brand. Trigas USA cylinders ship with NIST-traceable Certificates of Analysis that meet OSHA 29 CFR 1910, EPA, and manufacturer calibration requirements.
How to order or match a part number
Don’t see your Gasco part number? Use the part number finder or send it to sales@trigas-usa.com and we’ll match the equivalent. All equivalents ship as disposable calibration gas cylinders. Order online at trigas-usa.com or call(786) 609-3221. No minimum order; volume pricing on 10 or more cylinders.