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    Gas Select™ gas list for Alicat mass flow instruments

    Alicat laminar DP gas mass flow meters and controllers are equipped with Gas Select, an onboard library with 98-130 gases. Any of the pre-loaded gases may also be used to generate and store up to 20 mixed gas calibrations using Composer. Using one instrument, users may each of these gases at the same accuracy specification without any need for recalibration, thanks to laminar DP technology.

    Alicat BASIS™ MEMS thermal mass flow instruments are equipped with a shorter 9-gas list, specified below. Switching between gases will change measurement accuracy.

    Alicat CODA Coriolis mass flow instruments are compatible with an even longer list of fluids but are not equipped with Gas Select, since fluid composition does not need to be known for accurate measurement.

    View the list of preloaded gases and their properties for Alicat laminar DP mass flow instruments, including absolute viscosity, density, and compressibility at both 25°C and 0°C here: Pre-loaded gases and properties (PDF)

    The complete list for standard and anticorrosive Alicat laminar DP flow instruments and BASIS MEMS thermal flow instruments can be found below.

    • Acetylene (C2H2)
    • Air
    • Argon (Ar)
    • i-Butane (i-C4H10)
    • n-Butane (n-C4H10)
    • Carbon dioxide (CO2)
    • Carbon monoxide (CO)
    • Deuterium (D2)
    • Ethane (C2H6)
    • Ethylene/Ethene (C2H4)
    • Helium (He)
    • Hydrogen (H2)
    • Krypton (Kr)
    • Methane (CH4)
    • Neon (Ne)
    • Nitrogen (N2)
    • Nitrous oxide (N2O)
    • Oxygen (O2)
    • Propane (C3H8)
    • Sulfur hexafluoride (SF6)
    • Xenon (Xe)
    • Name: 5% CH4 + 95% CO2
      • Short Name: Bio5M
    • Name: 10% CH4 + 90% CO2
      • Short Name: Bio10M
    • Name: 15% CH4 + 85% CO2
      • Short Name: Bio15M
    • Name: 20% CH4 + 80% CO2
      • Short Name: Bio20M
    • Name: 25% CH4 + 75% CO2
      • Short Name: Bio25M
    • Name: 30% CH4 + 70% CO2
      • Short Name: Bio30M
    • Name: 35% CH4 + 65% CO2
      • Short Name: Bio35M
    • Name: 40% CH4 + 60% CO2
      • Short Name: Bio40M
    • Name: 45% CH4 + 55% CO2
      • Short Name: Bio45M
    • Name: 50% CH4 + 50% CO2
      • Short Name: Bio50M
    • Name: 55% CH4 + 45% CO2
      • Short Name: Bio55M
    • Name: 60% CH4 + 40% CO2
      • Short Name: Bio60M
    • Name: 65% CH4 + 35% CO2
      • Short Name: Bio65M
    • Name: 70% CH4 + 30% CO2
      • Short Name: Bio70M
    • Name: 75% CH4 + 25% CO2
      • Short Name: Bio75M
    • Name: 80% CH4 + 20% CO2
      • Short Name: Bio80M
    • Name: 85% CH4 + 15% CO2
      • Short Name: Bio85M
    • Name: 90% CH4 + 10% CO2
      • Short Name: Bio90M
    • Name: 95% CH4 + 5% CO2
      • Short Name: Bio95M
    • EAN-32 (32% O2 + 68% N2)
    • EAN-36 (36% O2 + 64% N2)
    • EAN-40 (40% O2 + 60% N2)
    • EA-40 (40% O2 + 60% Air)
    • EA-60 (60% O2 + 40% Air)
    • EA-80 (80% O2 + 20% Air)
    • Heliox-20 (20% O2 + 80% He)
    • Heliox-21 (21% O2 + 79% He)
    • Heliox-30 (30% O2 + 70% He)
    • Heliox-40 (40% O2 + 60% He)
    • Heliox-50 (50% O2 + 50% He)
    • Heliox-60 (60% O2 + 40% He)
    • Heliox-80 (80% O2 + 20% He)
    • Heliox-99 (99% O2 + 1% He)
    • Metabolic exhalant (16% O2 + 78.04% N2 + 5% CO2 + 0.96% Ar)
    • P-5 (5% CH4 + 95% Ar)
    • P-10 (10% CH4 + 90% Ar)
    • Name: Coal gas (50% H2 + 35% CH4 + 10% CO + 5% C2H4)
      • Short Name: CoalG
    • Name: Endothermic gas (75% H2 + 25% N2)
      • Short Name: Endo
    • Name: HHO (66.67% H2 + 33.33% O2)
      • Short Name: HHO
    • Name: LPG HD-5 (96.1% C3H8 + 1.5% C2H6 + 0.4% C3H6 + 2% n-C4H10)
      • Short Name: HD-5
    • Name: LPG HD-10 (85% C3H8 + 10% C3H6 + 5% n-C4H10)
      • Short Name: HD-10
    • Name: Nat gas 1 (93% CH4 + 3% C2H6 + 1% C3H8 + 2% N2 + 1% CO2)
      • Short Name: NatG-1
    • Name: Nat gas 2 (95% CH4 + 3% C2H6 + 1% N2 + 1% CO2)
      • Short Name: NatG-2
    • Name: Nat gas 3 (95.2% CH4 + 2.5% C2H6 + 0.2% C3H8 + 0.1% C4H10 + 1.3% N2 + 0.7% CO2)
      • Short Name: NatG-3
    • Name: Syn gas 1 (40% H2 + 29% CO + 20% CO2 + 11% CH4)
      • Short Name: SynG-1
    • Name: Syn gas 2 (64% H2 + 28% CO + 1% CO2 + 7% CH4)
      • Short Name: SynG-2
    • Name: Syn gas 3 (70% H2 + 4% CO + 25% CO2 + 1% CH4)
      • Short Name: SynG-3
    • Name: Syn gas 4 (83% H2 + 14% CO + 3% CH4)
      • Short Name: SynG-4
    • Name: 4.5% CO2 + 13.5% N2 + 82% He
      • Short Name: LG-4.5
    • Name: 6% CO2 + 14% N2 + 80% He
      • Short Name: LG-6
    • Name: 7% CO2 + 14% N2 + 79% He
      • Short Name: LG-7
    • Name: 9% CO2 +15% N2 + 76% He
      • Short Name: LG-9
    • Name: 9.4% CO2 + 19.25% N2 + 71.35% He
      • Short Name: LG-9.4
    • Name: 9% Ne + 91% He
      • Short Name: HeNe-9
    • Name: 89% O2 + 7% N2 + 4% Ar
      • Short Name: OCG-89
    • Name: 93% O2 + 3% N2 + 4% Ar
      • Short Name: OCG-93
    • Name: 95% O2 + 1% N2 + 4% Ar
      • Short Name: OCG-95
    • Name: 2.5% O2 + 10.8% CO2 + 85.7% N2 + 1% Ar
      • Short Name: FG-1
    • 2.9% O2 + 14% CO2 + 82.1% N2 + 1% Ar
      • Short Name: FG-2
    • 3.7% O2 + 15% CO2 + 80.3% N2 + 1% Ar
      • Short Name: FG-3
    • 7% O2 + 12% CO2 + 80% N2 + 1% Ar
      • Short Name: FG-4
    • 10% O2 + 9.5% CO2 + 79.5% N2 + 1% Ar
      • Short Name: FG-5
    • 13% O2 + 7% CO2 + 79% N2 + 1% Ar
      • Short Name: FG-6
    • C-2 (2% CO2 + 98% Ar)
    • C-8 (8% CO2 + 92% Ar)
    • C-10 (10% CO2 + 90% Ar)
    • C-15 (15% CO2 + 85% Ar)
    • C-20 (20% CO2 + 80% Ar)
    • C-25 (25% CO2 + 75% Ar)
    • C-50 (50% CO2 + 50% Ar)
    • C-75 (75% CO2 + 25% Ar)
    • He-25 (25% He + 75% Ar)
    • He-50 (50% He + 50% Ar)
    • He-75 (75% He + 25% Ar)
    • He-90 (90% He + 10% Ar)
    • A1025 (90% He + 7.5% Ar + 2.5% CO2)
    • Stargon CS (90% Ar + 8% CO2 + 2% O2)

    *These gases require S-Series instruments (MS/MCS/PS/PCS).

    • Ammonia (NH3)
    • Butylene (1-Butene)
    • Cis-Butene (cis-2-Butene)
    • Iso-Butene
    • Trans-Butene
    • Carbonyl sulfide (COS)
    • Chlorine (Cl2)
    • Dimethylether (CH3OCH3)
    • Hydrogen sulfide (H2S)
    • Nitrogen trifluoride (NF3)
    • Nitric oxide (NO)
    • Propylene (C3H6)
    • Silane (SiH4)
    • Sulfur dioxide (SO2)

    *These gases require S-Series instruments (MS/MCS/PS/PCS).

    • R-11 Trichlorofluoromethane (CCl3F)
    • R-14 Tetrafluoromethane (CF4)
    • R-22 Difluoromonochloromethane (CHClF2)
    • R-23 Trifluoromethane (CHF3)
    • R-32 Difluoromethane (CH2F2)
    • R-115 Chloropentafluoroethane (C2ClF5)
    • R-116 Hexafluoroethane (C2F6)
    • R-124 Chlorotetrafluoroethane (C2HClF4)
    • R-125 Pentafluoroethane (C2HF5)
    • R-134A Tetrafluoroethane (CH2FCF3)
    • R-142B Chlorodifluoroethane (CH3CClF2)
    • R-143A Trifluoroethane (C2H3F3)
    • R-152A Difluoroethane (C2H4F2)
    • RC-318 Octafluorocyclobutane (C4F8)
    • R-404A (44% R-125 + 4% R-134A + 52% R-143A)
    • R-407C (22% R-32 + 25% R-125 + 52% R-134A)
    • R-410A (50% R-32 + 50% R-125)
    • R-507A (50% R-125 + 50% R-143A)

    These gases are available on BASIS™ MEMS thermal mass flow meters and controllers.

    Accuracy between gases will vary. See the specification sheet for details.

    • Air
    • Nitrogen (N2)
    • Oxygen (O2)
    • Methane (CH4)
    • Helium (He)
    • Hydrogen (H2)
    • Argon (Ar)
    • Carbon dioxide (CO2)
    • Nitrous oxide (N2O)
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