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Gas Monitors by Gas · 1,400 products, every brand we carry

Multi-Gas Monitors

413 multi-gas monitors from every brand we carry, listed with what each manufacturer publishes, and live prices.

Pick a brand, gas, number of gases, sampling or battery; the list below narrows as you choose. Prices are live.

By type
Sample-Draw Monitors (426)Single-Gas Monitors (102)Replacement Sensors (88)Calibration Gas & Kits (88)Batteries & Chargers (47)Detector Tubes & Pumps (31)Breathing Air Testing (14)Multi-Gas Monitors (413)
By number of gases
4 gases Monitors (200)3 gases Monitors (195)2 gases Monitors (189)1 gas Monitors (153)5 gases Monitors (108)6 gases Monitors (85)
By battery and type
Sample-Draw Monitors with Li-Ion Batteries (264)Sample-Draw Monitors with Alkaline Batteries (85)Sample-Draw Monitors with Alkaline & Li-Ion Batteries (76)Single-Gas Monitors with Li-Ion Batteries (20)Single-Gas Monitors with Alkaline Batteries (16)Multi-Gas Monitors with Li-Ion Batteries (186)Multi-Gas Monitors with Alkaline Batteries (76)Multi-Gas Monitors with Alkaline & Li-Ion Batteries (73)Multi-Gas Monitors with Rechargeable Li-Ion Batteries (186)

413 products

Ratings and specifications are as published by each manufacturer. Tap a group to open it.

RKI Instruments317 products

Open the RKI Instruments page

BW Technologies / Honeywell Analytics61 products

Open the BW Technologies / Honeywell Analytics page

MSA29 products

Open the MSA page

  • MSA 1011692 ALTAIR 5X Multi-Gas Monitor Kit, Probe — MSA · Gases detected: LEL; O2; H2S; CO; SO2 · Gases: 5 gases · Sampling: Pump (sample draw) · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol; H2S 0-200 ppm; CO 0-2,000 ppm; SO2 0-20 ppm · Approvals: UL Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III Div 1; CSA C22.2 No. 152, C22.2 No. 157; ATEX II 2G Ex d ia mb IIC Gb (Zone 1 with XCell Ex sensor); IECEx; MSHA 30 CFR Part 22; IP65
  • MSA 10116924 ALTAIR 5X Multi-Gas Monitor, LEL — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Pump (sample draw) · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol; H2S 0-200 ppm; CO 0-2,000 ppm · Approvals: UL Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III Div 1; CSA C22.2 No. 152, C22.2 No. 157; ATEX II 2G Ex d ia mb IIC Gb (Zone 1 with XCell Ex sensor); IECEx; MSHA 30 CFR Part 22; IP65
  • MSA 10116925 Sample-Draw Gas Monitors, ALTAIR 5X Combustible Gas, Hydrogen Sulfide — MSA · Gases detected: LEL; O2; H2S; CO; SO2 · Gases: 5 gases · Sampling: Pump (sample draw) · Battery: Li-Ion · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol; H2S 0-200 ppm; CO 0-2,000 ppm; SO2 0-20 ppm · Approvals: UL Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III Div 1; CSA C22.2 No. 152, C22.2 No. 157; ATEX II 2G Ex d ia mb IIC Gb (Zone 1 with XCell Ex sensor); IECEx; MSHA 30 CFR Part 22; IP65
  • MSA 10116926 ALTAIR 5X Multi-Gas Detector Kit, LEL — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Pump (sample draw) · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol; H2S 0-200 ppm; CO 0-2,000 ppm · Approvals: UL Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III Div 1; CSA C22.2 No. 152, C22.2 No. 157; ATEX II 2G Ex d ia mb IIC Gb (Zone 1 with XCell Ex sensor); IECEx; MSHA 30 CFR Part 22; IP65
  • MSA 10116928 ALTAIR 5X Multi-Gas Monitor Kit, Probe — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Pump (sample draw) · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol; H2S 0-200 ppm; CO 0-2,000 ppm · Approvals: UL Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III Div 1; CSA C22.2 No. 152, C22.2 No. 157; ATEX II 2G Ex d ia mb IIC Gb (Zone 1 with XCell Ex sensor); IECEx; MSHA 30 CFR Part 22; IP65
  • MSA 10125912 ALTAIR 4X Portable Oxygen — MSA · Gases detected: LEL; O2; CO · Gases: 3 gases · Sampling: Diffusion · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol; CO 0-1,999 ppm · Approvals: IECEx Ex ia I Ma; Ex da ia IIC T3 Ga (with combustible XCell sensor); Ta -40 to +60 °C; IP67 (see device label for the certification that applies)
  • MSA 10125913 ALTAIR 4X Oxygen, Carbon Monoxide And Methane Multi Gas Monitor — MSA · Gases detected: LEL; O2; CO · Gases: 3 gases · Sampling: Diffusion · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol; CO 0-1,999 ppm · Approvals: IECEx Ex ia I Ma; Ex da ia IIC T3 Ga (with combustible XCell sensor); Ta -40 to +60 °C; IP67 (see device label for the certification that applies)
  • MSA 10125914 ALTAIR 4X Methane And Nitrogen Dioxide Multi Gas Monitor — MSA · Gases detected: LEL; NO2 · Gases: 2 gases · Sampling: Diffusion · Sensor ranges: LEL 0-100% LEL; NO2 0-50 ppm · Approvals: IECEx Ex ia I Ma; Ex da ia IIC T3 Ga (with combustible XCell sensor); Ta -40 to +60 °C; IP67 (see device label for the certification that applies)
  • MSA 10153985 ALTAIR 2XT Sulfur Dioxide And Hydrogen Sulfide Multi Gas Monitor — MSA · Gases detected: H2S; SO2 · Gases: 2 gases · Sampling: Diffusion · Sensor ranges: H2S 0-200 ppm; SO2 0-20 ppm · Approvals: Intrinsically safe (ATEX, IEC, CSA), -40 to 60 °C; IP67
  • MSA 10154040 ALTAIR 2XT Carbon Monoxide, Hydrogen Sulfide — MSA · Gases detected: H2S; CO · Gases: 2 gases · Sampling: Diffusion · Sensor ranges: H2S 0-200 ppm; CO 0-1,999 ppm · Approvals: Intrinsically safe (ATEX, IEC, CSA), -40 to 60 °C; IP67
  • MSA 1016544 ALTAIR 5X Multi-Gas Monitor, LEL — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Pump (sample draw) · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol; H2S 0-200 ppm; CO 0-2,000 ppm · Approvals: UL Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III Div 1; CSA C22.2 No. 152, C22.2 No. 157; ATEX II 2G Ex d ia mb IIC Gb (Zone 1 with XCell Ex sensor); IECEx; MSHA 30 CFR Part 22; IP65
  • MSA 10178356 Multi-Gas Detectors, ALTAIR 4XR Multi-Gas Monitor Kit, LEL — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Diffusion · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol (certified 0-25% vol); H2S 0-200 ppm; CO 0-1,999 ppm · Approvals: CSA Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III; T3; ATEX Sira 16ATEX2292; IECEx SIR 16.0096; CSA C22.2 No. 60079-29-1; ANSI/ISA 60079-29-1; EN 60079-29-1:2016; IP68
  • MSA 10178357 ALTAIR 4XR Multi-Gas Monitor Kit, Pump Probe — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Pump (sample draw) · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol (certified 0-25% vol); H2S 0-200 ppm; CO 0-1,999 ppm · Approvals: CSA Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III; T3; ATEX Sira 16ATEX2292; IECEx SIR 16.0096; CSA C22.2 No. 60079-29-1; ANSI/ISA 60079-29-1; EN 60079-29-1:2016; IP68
  • MSA 10178358 Sample-Draw Gas Monitors, ALTAIR 4XR Combustible Gas, Hydrogen Sulfide — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Pump (sample draw) · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol (certified 0-25% vol); H2S-LC 0-100 ppm; CO 0-1,999 ppm · Approvals: CSA Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III; T3; ATEX Sira 16ATEX2292; IECEx SIR 16.0096; CSA C22.2 No. 60079-29-1; ANSI/ISA 60079-29-1; EN 60079-29-1:2016; IP68
  • MSA 10178558 ALTAIR 4XR Multi-Gas Detector, Glow in the Dark — MSA · Gases detected: LEL; O2; H2S; CO · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol (certified 0-25% vol); H2S 0-200 ppm; CO 0-1,999 ppm · Approvals: CSA Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III; T3; ATEX Sira 16ATEX2292; IECEx SIR 16.0096; CSA C22.2 No. 60079-29-1; ANSI/ISA 60079-29-1; EN 60079-29-1:2016; IP68
  • MSA 10178559 ALTAIR 4XR Portable Oxygen And Combustible Gas Multi Gas Monitor — MSA · Gases detected: LEL; O2 · Gases: 2 gases · Sampling: Diffusion · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol (certified 0-25% vol) · Approvals: CSA Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III; T3; ATEX Sira 16ATEX2292; IECEx SIR 16.0096; CSA C22.2 No. 60079-29-1; ANSI/ISA 60079-29-1; EN 60079-29-1:2016; IP68
  • MSA 10178566 ALTAIR 4XR Combustible Gas — MSA · Gases detected: LEL; O2; CO · Gases: 3 gases · Sampling: Diffusion · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol (certified 0-25% vol); CO 0-1,999 ppm · Approvals: CSA Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III; T3; ATEX Sira 16ATEX2292; IECEx SIR 16.0096; CSA C22.2 No. 60079-29-1; ANSI/ISA 60079-29-1; EN 60079-29-1:2016; IP68
  • MSA 10178568 ALTAIR 4XR Portable Combustible Gas And Oxygen Multi Gas Monitor — MSA · Gases detected: LEL; O2 · Gases: 2 gases · Sampling: Diffusion · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol (certified 0-25% vol) · Approvals: CSA Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III; T3; ATEX Sira 16ATEX2292; IECEx SIR 16.0096; CSA C22.2 No. 60079-29-1; ANSI/ISA 60079-29-1; EN 60079-29-1:2016; IP68
  • MSA 10178571 ALTAIR 4XR Combustible Gas, Oxygen — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Diffusion · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol (certified 0-25% vol); H2S 0-200 ppm; CO 0-1,999 ppm · Approvals: CSA Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III; T3; ATEX Sira 16ATEX2292; IECEx SIR 16.0096; CSA C22.2 No. 60079-29-1; ANSI/ISA 60079-29-1; EN 60079-29-1:2016; IP68
  • MSA 10178572 ALTAIR Carbon Monoxide, Combustible Gas — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Diffusion · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol (certified 0-25% vol); H2S-LC 0-100 ppm; CO 0-1,999 ppm · Approvals: CSA Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III; T3; ATEX Sira 16ATEX2292; IECEx SIR 16.0096; CSA C22.2 No. 60079-29-1; ANSI/ISA 60079-29-1; EN 60079-29-1:2016; IP68
  • MSA 10245598 ALTAIR io 4 Connected Multi-Gas Detector, LEL — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Diffusion · Approvals: UL 913 8th Ed. (UL R-E190105); CSA 25CA80273231X; ATEX UL 21 ATEX 2539 T4; IECEx UL 21.0030 T4; EN 60079-29-1:2016 / IEC 60079-29-1 performance (methane, propane 0-100% LFL)
  • MSA 10255038 Sample-Draw Gas Monitors, ALTAIR io 6 Portable Carbon Monoxide — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Pump (sample draw)
  • MSA 10255039 Sample-Draw Gas Monitors, ALTAIR io 6 Portable Combustible Gas — MSA · Gases detected: LEL; O2; H2S; CO; SO2 · Gases: 5 gases · Sampling: Pump (sample draw)
  • MSA 10255040 Sample-Draw Gas Monitors, ALTAIR io 6 Portable Combustible Gas — MSA · Gases detected: LEL; O2; H2S; CO; Cl2 · Gases: 5 gases · Sampling: Pump (sample draw)
  • MSA 10255041 Sample-Draw Gas Monitors, ALTAIR io 6 Portable Combustible Gas — MSA · Gases detected: LEL; O2; H2S; CO; NH3 · Gases: 5 gases · Sampling: Pump (sample draw)
  • MSA 10255042 Sample-Draw Gas Monitors, ALTAIR io 6 Portable Combustible Gas — MSA · Gases detected: LEL; O2; H2S; CO; NO2 · Gases: 5 gases · Sampling: Pump (sample draw)
  • MSA A-ALT5X-ALK0100C010 Sample-Draw Gas Monitors, ALTAIR 5X Portable Combustible Gas — MSA · Gases detected: LEL; O2; H2S; CO · Gases: 4 gases · Sampling: Pump (sample draw) · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol; H2S 0-200 ppm; CO 0-2,000 ppm · Approvals: UL Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III Div 1; CSA C22.2 No. 152, C22.2 No. 157; ATEX II 2G Ex d ia mb IIC Gb (Zone 1 with XCell Ex sensor); IECEx; MSHA 30 CFR Part 22; IP65
  • MSA A-ALT5XALKD100C000 Multi-Gas Detectors, ALTAIR 5X Multi-Gas Monitor, LEL — MSA · Gases detected: LEL; O2; H2S; CO; NH3 · Gases: 5 gases · Sampling: Pump (sample draw) · Sensor ranges: LEL 0-100% LEL; O2 0-30% vol; H2S 0-200 ppm; CO 0-2,000 ppm; NH3 0-100 ppm · Approvals: UL Class I Div 1 Groups A, B, C, D; Class II Div 1 Groups E, F, G; Class III Div 1; CSA C22.2 No. 152, C22.2 No. 157; ATEX II 2G Ex d ia mb IIC Gb (Zone 1 with XCell Ex sensor); IECEx; MSHA 30 CFR Part 22; IP65
  • MSA H2412-1312 Bacharach PCA Carbon Monoxide, Oxygen — MSA · Gases detected: O2; CO; NO2; NO · Gases: 4 gases · Sampling: Diffusion
Industrial Scientific6 products

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In plain words. A gas monitor is described by the gases it detects (LEL for combustibles, O2 for oxygen, H2S, CO, and so on), how many it detects at once, whether it samples by diffusion (air reaches the sensors on its own) or with a pump (sample draw, for checking a space before entry), how it is powered, and the approvals that let it be used in a classified area. All of these are the manufacturer's published specifications; alarm points and calibration intervals follow the manufacturer's manual.

Technical. Intrinsic-safety approvals are listed as the manufacturer prints them (UL or CSA Class I Division 1 Groups A–D, ATEX and IECEx Ex ia IIC T4 marks). Sensor ranges are quoted per gas (for example 0–100% LEL, 0–30% volume O2, 0–100 ppm H2S, 0–500 ppm CO; PID sensors for VOCs in ppm or ppb with the lamp energy in eV; IR sensors for CO2 or methane). Calibration gas is matched to the monitor's sensors and listed by concentration. Draeger detector tubes have their own finder page.

Ratings and specifications on this page are shown as published by the manufacturer or the named standard and describe performance in that standard's test. They are not a recommendation for any task. The employer's hazard assessment decides what protective equipment a job needs. Verify details against the manufacturer's current documentation before you buy.

The standard at a glance

Copied from the named standard or regulation and shown with its source; nothing in these tables is Bayshore's recommendation.

OSHA confined-space atmosphere limits
Condition (29 CFR 1910.146)Limit
Oxygen deficientBelow 19.5% oxygen
Oxygen enrichedAbove 23.5% oxygen
FlammableAbove 10% of the lower flammable limit (LFL)
ToxicAbove the substance's permissible exposure limit (29 CFR 1910 Subpart Z)
Approval mark (as printed by the manufacturer)Meaning
UL or CSA Class I, Division 1, Groups A–DIntrinsically safe for flammable gas and vapour atmospheres (North America)
ATEX / IECEx Ex ia IIC T4Intrinsically safe, gas group IIC, temperature class T4 (Europe / international)

Source: OSHA 29 CFR 1910.146 (permit-required confined spaces). Alarm set points and calibration intervals follow each manufacturer's manual. Draeger detector tubes have their own finder.

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