Bosean BH-4A Multi Gas Detector User Manual

1. Product Overview

The Bosean BH-4A Multi Gas Detector is a portable device designed for accurate detection of LEL (Lower Explosive Limit), Oxygen (O2), Carbon Monoxide (CO), and Hydrogen Sulfide (H2S) gases. It features a 2.0-inch industrial-level LCD display for clear readings and utilizes imported gas sensors with microprocessor technology for fast response, high sensitivity, and stable performance.

This detector is small in size, making it easy to carry and operate, and boasts an IP65 rating for protection against dust and water ingress, along with ATEX approval for use in potentially explosive atmospheres.

Key Features:

• Natural diffusion sampling method with high-sensitivity sensors.
• Large LCD for intuitive, clear indication of real-time gas concentrations and system status.
• Fast response time (≤30s) and high repeatability.
• Powered by a DC 3.7V Li-ion battery (1800mAh) for extended operation.
• Robust IP65 protection grade.
• Suitable for applications in underground channels and the mining industry.

2. Setup and Initial Use

2.1 Unpacking and Inspection

• Carefully remove the detector from its packaging.
• Inspect the device for any visible damage. If damage is found, do not use the device and contact customer support.
• Verify that all components listed in the "Scope of Supply" are present: 1 Unit of Bosean BH-4A Multi Gas Detector and Instruction Manual.

2.2 Charging the Battery

Before first use, fully charge the device. The detector is powered by a DC 3.7V Li-ion battery (1800mAh).

• Connect the provided charging cable to the detector's charging port.
• Connect the other end of the cable to a suitable power source.
• The charging time is approximately 6 to 8 hours for a full charge.
• Ensure the device is fully charged before critical operations to achieve the specified working time of ≥8 hours continuously (without alarming).

2.3 Powering On/Off

• To power on: Press and hold the power button (center button below the display) until the LCD screen illuminates and the device initializes.
• To power off: Press and hold the power button until the device shuts down. Follow any on-screen prompts if applicable.

3. Operation

3.1 Gas Detection

The BH-4A detector uses a natural diffusion sampling method to detect gases in the surrounding environment.

• Ensure the sensor grilles at the bottom of the device are unobstructed.
• Position the detector in the area where gas detection is required.
• The LCD will display real-time concentrations for LEL, O2, CO, and H2S.
• Allow sufficient time for the readings to stabilize, especially when moving between different environments.

3.2 Interpreting Readings

The display shows readings for each gas type:

• LEL: Lower Explosive Limit, measured in %LEL (0 to 100%). Indicates the concentration of flammable gas or vapor in air below which an explosive atmosphere will not be formed.
• O2: Oxygen, measured in %VOL (0 to 30%). Normal atmospheric oxygen is approximately 20.9% VOL. Deviations indicate oxygen enrichment or depletion.
• CO: Carbon Monoxide, measured in ppm (parts per million) (0 to 1000 ppm). A highly toxic gas.
• H2S: Hydrogen Sulfide, measured in ppm (0 to 100 ppm). A highly toxic and corrosive gas.

3.3 Alarm Functions

The device is equipped with a visual alarm system. When gas concentrations exceed predefined thresholds, the detector will activate its alarm to alert the user.

• Familiarize yourself with the alarm thresholds for each gas as per safety regulations relevant to your application.
• Upon alarm activation, immediately follow your organization's safety protocols for gas exposure.

4. Maintenance

4.1 Cleaning

• Regularly clean the exterior of the detector with a soft, damp cloth.
• Do not use abrasive cleaners or solvents, as these can damage the casing or sensors.
• Ensure the sensor grilles are free from dust, dirt, or debris to maintain accurate readings.

4.2 Calibration

Regular calibration is crucial for maintaining the accuracy and reliability of the gas detector. The device supports zero calibration and gas calibration.

• Zero Calibration (ZERO CAL): Performed in a clean air environment to set the baseline (zero) reading for all sensors.
• Gas Calibration (GAS CAL): Performed using certified calibration gases to adjust the sensor's response to known concentrations.
• Refer to the detailed instructions in the included Instruction Manual for specific calibration procedures and recommended intervals.
• It is recommended to have the device calibrated by qualified personnel or a certified calibration service regularly.

4.3 Battery Care

• Recharge the battery when the low battery indicator appears on the display.
• Avoid completely draining the battery frequently to prolong its lifespan.
• If storing the device for an extended period, charge the battery to approximately 50% and store in a cool, dry place. Recharge every 3-6 months.

5. Troubleshooting

This section provides solutions to common issues you might encounter with your Bosean BH-4A Multi Gas Detector. For problems not listed here, please contact customer support.

6. Technical Specifications

7. Warranty and Support

7.1 Warranty Information

This product is manufactured by Instrukart. For specific warranty terms and conditions, please refer to the warranty card included with your product or contact Instrukart customer support. Extended warranty plans may be available for purchase separately.

7.2 Customer Support

For any technical assistance, troubleshooting, or inquiries regarding your Bosean BH-4A Multi Gas Detector, please contact Instrukart customer support:

• Phone: +91 8142350506
• Manufacturer: Instrukart
• For the most up-to-date contact information, please visit the official Instrukart website or refer to the product packaging.