Portable 4 Gas Monitor - LEL, O2, CO & H2S Gas Detection
Portable 4 Gas Monitor - LEL, O2, CO & H2S Gas Detection - LEL + O2 + CO + H2S Free standard shipping to supported destinations. See the shipping policy for preparation and transit estimates.
Need help choosing? Tell us what you need to measure.
Shipping & returns
Shipping & returns
Free standard shipping is available to supported destinations. Delivery time includes order preparation and transit and varies by destination. See our shipping policy for current delivery estimates and availability.
See our return policy for return conditions. For an order-specific delivery question, contact Mcooh.
Portable 4 Gas Monitor - LEL, O2, CO & H2S Gas Detection - LEL + O2 + CO + H2S Free standard shipping to supported destinations. See the shipping policy for preparation and transit estimates.
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Tell us your measurement range, material or target, and operating conditions.
Description
Description
Choose the Standard Four-Gas Diffusion Configuration
This portable monitor’s standard online combination is combustible gas on a LEL scale, oxygen, carbon monoxide and hydrogen sulfide. It uses diffusion sampling. Compare that combination with the gases required by the task before choosing an alternative sensor package: the extended gas table below lists custom options, not all gases installed in one standard unit.
Listed Purchase Options
| Option | SKU |
|---|---|
| LEL + O2 + CO + H2S | GAS-TU7K-01 |
This online option is the listed LEL + O2 + CO + H2S combination. The additional sensor choices below are not extra channels included with this SKU.
Questions That Help You Choose
Are these the four channels I need?
The standard configuration is LEL + O2 + CO + H2S. Another sensor combination is a separate configuration question, not an extra standard online channel.
Does diffusion fit the sampling plan?
This model has no internal pump. Compare the pump model when active sampling is needed.
What should a custom request specify?
List the required gases and ranges together. Custom sensor choices are not the same as selecting a listed standard unit.
For the buying comparison, read portable multi-gas selection guide and four-gas vs. five-gas comparison.
Compare internal-pump four-gas option.
Compare Standard and Pump-Assisted Purchase Options
The BH-4A four-gas monitor lists standard and pump-assisted variants as separate choices. This page lists the diffusion configuration. Compare those purchase options when a pump is part of the task, while keeping the required O2, H2S, CO and LEL channels as the basis for the comparison.
The portable 4 gas monitor simultaneously checks combustible gas (LEL), oxygen (O2), carbon monoxide (CO), and hydrogen sulfide (H2S) through diffusion sampling. The four readings appear together on the LCD, making the instrument suitable for field and facility checks where these common atmospheric hazards must be monitored.
Standard Configuration and Custom Gas Options
The standard online configuration is LEL + O2 + CO + H2S. The Gas Monitor can also be customized with the additional supported gas sensors listed below. Custom configurations are not standard online variants; contact us before ordering to confirm the required gas combination, measuring range, sensor availability, and quotation.
| Gas | Range | Accuracy | Minimum Reading | Sensor Response Limit |
|---|---|---|---|---|
| Combustible Gas (LEL) | 0-100% LEL | ≤±5% F.S. | 1% LEL | ≤15 s |
| Oxygen (O2) | 0-30% vol | ≤±5% F.S. | 0.1% vol | ≤20 s |
| Carbon Monoxide (CO) | 0-1000 ppm | ≤±5% F.S. | 1 ppm | ≤25 s |
| Hydrogen Sulfide (H2S) | 0-100 ppm | ≤±5% F.S. | 1 ppm | ≤30 s |
| Sulfur Dioxide (SO2) | 0-100 ppm | ≤±5% F.S. | 0.1 ppm | ≤30 s |
| Nitric Oxide (NO) | 0-250 ppm | ≤±5% F.S. | 1 ppm | ≤60 s |
| Nitrogen Dioxide (NO2) | 0-20 ppm | ≤±5% F.S. | 0.1 ppm | ≤25 s |
| Chlorine (Cl2) | 0-20 ppm | ≤±5% F.S. | 0.1 ppm | ≤30 s |
| Ammonia (NH3) | 0-100 ppm | ≤±5% F.S. | 1 ppm | ≤50 s |
| Hydrogen (H2) | 0-1000 ppm | ≤±5% F.S. | 1 ppm | ≤60 s |
| Hydrogen Cyanide (HCN) | 0-50 ppm | ≤±5% F.S. | 0.1 ppm | ≤200 s |
| Hydrogen Chloride (HCl) | 0-30 ppm | ≤±5% F.S. | 0.1 ppm | ≤60 s |
| Phosphine (PH3) | 0-1000 ppm | ≤±5% F.S. | 0.1/1 ppm | ≤25 s |
| Ozone (O3) | 0-20 ppm | ≤±5% F.S. | 0.1 ppm | ≤50 s |
Alarm and Display Features
- Audible, visual, and vibration alarms with sound pressure above 90 dB
- LCD shows gas concentration, gas type, unit, battery level, and time
- Chinese and English interface options
- ppm and mg/m³ unit switching where applicable
- Diffusion sampling without an internal pump
- Integrated back clip for portable use
Technical Specifications
| Standard gas configuration | LEL + O2 + CO + H2S |
|---|---|
| Custom gas options | Available by inquiry; see the supported gas table above |
| Sampling method | Diffusion |
| Linear accuracy | ≤±5% F.S. |
| General response time | <10 s |
| Alarm modes | Audible, visual, and vibration |
| Alarm sound pressure | >90 dB |
| Display | LCD |
| Power | 3.7 V rechargeable lithium-ion battery |
| Standby time | At least 30 days |
| Use time | At least 24 hours |
| Operating temperature | -35 to 65 °C |
| Operating humidity | 10-95% RH, non-condensing |
| Dimensions | 146 x 71 x 42 mm (H x W x D) |
| Approximate weight | 0.25 kg |
| Housing / ingress protection | ABS / IP66 |
| Explosion protection | Ex ib IIC T4 Gb |
Use Notes
Because the gas detector uses diffusion sampling, the surrounding atmosphere must reach the sensor openings. Alarm settings, calibration, bump testing, and operating checks should follow the supplied sensor documentation and the workplace safety procedure.
