Portable Gas Detectors — Single-Gas and Multi-Gas

Compare portable gas detectors by target gas, measurement range and sampling method. Start with what the instrument must measure, then choose a single-gas model, a complete multi-gas configuration or a leak-investigation tool. The groups below lead to current product pages and their order options.

Find the Right Measurement Task

• Ammonia (NH3): Pump or Diffusion
• Oxygen (O2) Concentration
• Four-Gas Monitors: LEL/EX, O2, CO and H2S
• Other Multi-Gas Configurations
• Carbon Monoxide (CO) Readings and Alarm Formats
• Carbon Dioxide (CO2) Measurement
• Combustible-Gas Readings and Leak Investigation
• Other Gas-Specific Instruments
• Select One Gas: Configurable Single-Gas Products
• Laser Methane: Handheld Instrument or Component

Ammonia (NH3): Pump or Diffusion

Compare the NH3 range and sampling arrangement. Dedicated SKY2000, MH-1200H-S and AR8500 models have different order menus; configurable single-gas products provide additional NH3 choices.

• SKY2000-NH3 — internal pump; six ranges
• MH-1200H-S-NH3 — diffusion; four ranges
• AR8500 — handheld NH3 option

Oxygen (O2) Concentration

Choose an oxygen concentration span and sampling package. The higher SKY2000 range options are separate order variants, not extra ranges of every O2 detector.

• SKY2000-O2 — pump; 0-25/30/50/100% Vol variants
• MH-1200H-S-O2 — diffusion; 0-25/30% Vol
• K100A-O2 — O2-30VOL option

Four-Gas Monitors: LEL/EX, O2, CO and H2S

Compare the exact combustible-gas, oxygen, carbon-monoxide and hydrogen-sulfide combination. Pump packages and diffusion instruments are separate options; channel count alone does not identify the gases.

• Portable four-gas monitor — diffusion
• Portable four-gas monitor — internal pump
• BH-4A — standard and with-pump variants
• BH-4S — O2, EX, H2S and CO
• HT1805 — CO, H2S, O2 and LEL

Other Multi-Gas Configurations

These products serve different gas combinations from the standard four-gas group above. Choose the complete gas set first, then compare extra readings and data functions.

• BH-4S — O3, SO2, NO2 and CO2
• K-600M — CO, NO2, O2 and SO2
• Six-gas pump model — CO, NO2, SO2, H2S, VOC and O3

Carbon Monoxide (CO) Readings and Alarm Formats

Choose a handheld concentration meter or an alarm format according to the task. CO is not CO2. Compare power, reading functions, alarm controls and the required product documentation.

• ST9700 — CO and ambient temperature
• AS8700A — CO and ambient temperature
• HT1000 — hold and maximum readings
• MH-1200H-S-CO — three range options
• BH-90A CO — 0-1000 ppm
• Rechargeable CO detector — triple alarms
• Compact CO alarm — CR2032 power
• BH-H3 — wall-powered combustible-gas and CO alarm

Carbon Dioxide (CO2) Measurement

CO2 concentration measurement is separate from a CO reading or a combustible-gas indication. Compare the exact CO2 model and range for the intended task; do not infer room-monitoring or industrial suitability from a broad search term alone.

• Portable CO2 Detector - Infrared Sensor and Pump Sampling

Combustible-Gas Readings and Leak Investigation

Flexible probes help access a suspected leak point; a concentration meter provides its stated measuring format. Do not treat a sensor response list as independent identification of every gas.

• AS8800L — flexible leak probe
• MT8800 / AT8800L — model options
• CGD02A — flexible probe and bar display
• CGD02 — diffusion, 0-100% LEL display
• CH4 or EX — separate 0-100% LEL options
• Digital natural-gas detector — ppm display

Other Gas-Specific Instruments

Use the full gas name, required range and sampling arrangement to find a model. H2 and H2S, NO and NO2, and C2H4 and C2H4O are separate gas identities.

• MH-1200H-S-H2 — diffusion hydrogen
• BH-90A H2 — hydrogen range options
• MH-1200H-S-H2S — hydrogen sulfide
• MH-1200H-S-CL2 — chlorine gas
• SKY2000-NO2 — pump nitrogen dioxide
• Portable NO2 — five range/resolution options
• SKY2000-O3 — pump ozone
• BH-90A O3 — ozone range options
• K-600 — pump ozone
• Portable PH3 — 20/200 ppm options
• K-100A PH3 — 20/50/100 ppm options
• SKY2000-CH2O — pump formaldehyde
• BH-90A C6H6 — benzene
• BH-90A C2H4 — ethylene
• SKY2000-N2 — nitrogen

Select One Gas: Configurable Single-Gas Products

These products offer a gas selector, not all-gas simultaneous measurement. HCN, HCl, NO and SO2 are available as named options on the OLED and pump products; the 18-configuration product also includes a separate C2H4O option.

• OLED diffusion detector — 14 named gas options
• Internal-pump detector — 14 named gas options
• Single-gas family — 18 gas/range configurations

Laser Methane: Handheld Instrument or Component

The handheld remote detector and the integration probe are different product types. Select a complete remote instrument or a sensor component according to the equipment requirement.

• CQ-JGYC-01 — remote handheld methane detector
• CQ-JG-01 — methane sensor probe for integration

Pump or Diffusion: Compare Within the Required Gas

Use a model with an explicitly stated internal pump when the selected procedure needs that sampling arrangement. A diffusion model with an optional external pump is a separate package decision. Confirm tubing, filters, connections and supplied accessories; an option name alone does not establish the full sampling system.

Pumped vs diffusion gas detectors explains the comparison. Gas-specific ranges and product packages remain on the corresponding product pages.

Before Selecting an Order Option

1. Record every required gas, measurement unit and concentration span.
2. Match that requirement to the exact model and current variant; avoid transferring a family-wide specification to every gas option.
3. Compare sampling, alarm controls, display, records, power and supplied accessories.
4. Check the instrument instructions, calibration needs and documentation required for the intended task.

Selection Guides

• Single-gas vs multi-gas selection
• Multi-gas detector selection and maintenance
• Ammonia detector selection for refrigeration work
• Oxygen detector selection for confined spaces
• Bump testing and calibration: what each does

Open a product to select its configuration and review current price and purchase options. If the exact gas, range or package is not shown, send the model and measurement requirement for a configuration check.

Selection note: Follow the supplied instrument instructions and applicable site procedures. This collection is a product comparison, not a site-specific monitoring design or risk assessment.