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BH-4A Multi-Gas Detector
1. High Precise Sensors with quick response T＜30s
2. Professional Certification with ATEX, CE, FCC etc.
3. Multiple Detectable Gases–flexible to combine
4. Explosion-Proof Safety–Ex ib llC T4 Gb
5. Four audible, visible and touchable Alarms
6. Portable Design and Easy installation
7. Long lifespan 2 years and 12 months Warranty
8. Low maintenance cost
9. Large screen digital display
●We provide gas detector OEM/ODM service.
Tel: +86 18702270557
Email: vivian@langolaser.com
BH-4A Multi-Gas Detector is a professional-grade portable device for continuous monitoring of combustible gases, O2 and two toxic gases. With high-precision sensors and explosion-proof construction (IP65 rated), it’s ideal for mining, tunnels and industrial sites. The intuitive interface features a large LCD display and simple one-button operation, while its rugged design ensures reliable performance in harsh environments.
| Model No. | BH4A |
| Accuracy | ≦±5% F.S. |
| Response Time | ≦30s |
| Indication | LCD displays real-time and system status; LED, audio and vibration alert for gas leakage, fault and low voltage. |
| Sensor | O2 /H2S / CO: plug-in electrochemical sensor; Combustible gas (LEL): plug-in catalytic combustion sensor. |
| Working environment | -20℃～50℃, ＜95%RH (no dew) |
| Alarm Type | low & high alarm, multiple gas alarm, sensor alarm, battery low alarm, prompt tone, automatic shutdown alarm |
| Backlight | Automatically activated when working in poor lighting environment or the alarm sounding or the button is knobbed down. |
| Power Source | DC3.7V Li-on battery, 1800mAh |
| Charging time | 6h~8h |
| Working time | ≧8h continuously (without alarming) |
| Gas Sensor Life | 2 years |
| Explosion-proof grade | Ex ib llC T4 Gb |
| Weight | Appr. 400g (with battery) |
| Dimensions | 130mm×67mm×30mm(L × W × H) |
| Common Gases Parameter Listing | ||||
| Description | Range | Resolution | L-alarm | H-alarm |
| CO | 0-1000ppm | 1ppm | 50ppm | 150ppm |
| O2 | 0-30%VOL | 0.1%VOL | 19.5%VOL | 23.5%VOL |
| H2 | 0-1000ppm | 1ppm | 50ppm | 150ppm |
| H2S | 0-100ppm | 0.1ppm | 10ppm | 20ppm |
| CH4 | 0-100%LEL | 1%LEL | 20%LEL | 50%LEL |
| C2H4O | 0-100ppm | 1/0.1ppm | 20ppm | 50ppm |
| EX | 0-100%LEL | 1%LEL/1%VOL | 20%LEL | 50%LEL |
| C3H8 | 0-100%LEL | 1%LEL/1%VOL | 20%LEL | 50%LEL |
| C2H5OH | 0-100%LEL | 1%LEL/1%VOL | 20%LEL | 50%LEL |
| NH3 | 0-100ppm | 0.1/1ppm | 20ppm | 50ppm |
| CL2 | 0-20ppm | 0.1ppm | 5ppm | 10ppm |
| O3 | 0-10ppm | 0.1ppm | 2ppm | 5ppm |
| SO2 | 0-20ppm | 0.1/1ppm | 5ppm | 10ppm |
| PH3 | 0-20ppm | 0.1ppm | 5ppm | 10ppm |
| CO2 | 0-5000ppm | 1ppm/0.1%VOL | 1000ppm | 2000ppm |
| NO | 0-250ppm | 1ppm | 50ppm | 150ppm |
| NO2 | 0-20ppm | 0.1ppm | 5ppm | 10ppm |
| HCN | 0-50ppm | 0.1/0.01ppm | 10ppm | 20ppm |
| HCL | 0-20ppm | 0.001/0.1ppm | 5ppm | 10ppm |
| CH2O | 0-20ppm | 1/0.1ppm | 5ppm | 10ppm |
| HF | 0-100ppm | 0.01/0.1ppm | 2ppm | 5ppm |
| C7H8/C8H10 | 0-20ppm | 0.01/0.1ppm | 5ppm | 10ppm |
| Remark | Not all gases and range are listed, if you need more information, please contact us. We can also provide OEM/ODM services upon request. |
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Application:
1). Industrial Safety (Oil & Gas, Chemical Plants)
2). Medical & Laboratories equipment
3). Water Treatment
4). Mining Operations
5). Confined Space Entry (Construction, Sewers, Tanks, pipeline)
6). Fire & Combustion Safety
7). Marine & Offshore Rigs
Supplied with:
• 1 x multi-gas Detector
• 1 x Calibration cap
• 1 x User manual, 1 x warranty card
• 1 x Charge & Communications cable
Other accessories available: External sample pump
