The GDJ7W Mining Borehole Gas Wireless Multi-Parameter Laser Sensor is designed for monitoring the health status of extraction boreholes. It provides foundational data support for “full lifecycle management of boreholes,” “one borehole, one project,” and the evaluation of extraction effectiveness. It primarily monitors seven parameters: methane concentration, flow rate, pipeline pressure, temperature, carbon monoxide concentration, oxygen concentration, and flow velocity. The sensor is equipped with a built-in battery for power supply and offers both local storage and wireless automatic data transmission capabilities.

• NFC Functionality: Supports direct connection to the device via smartphone NFC for data reading and borehole identification.
• Smart Self-Check: Intelligently identifies its own status and provides abnormal alarm notifications, such as low battery alerts.
• Local Data Storage: Capable of storing up to 1,000 data entries locally.
• Built-in Battery: Operates without the need for external power supply.
• Dual Wireless Communication: Supports both Bluetooth and wireless RF communication, enabling local data collection with smart terminals or wireless data upload via underground RF networks.
• RS485 Interface: Supports wired data transmission.
• Dedicated Data Processing Software: Automatically generates reports and cumulative curves from monitored data.
• Detection Sensitivity: Detection threshold as low as 0.005 m³/min (DN50).

• Measurement Range and Basic Error
  

  Parameter	Measurement Range	Basic Error
  Flow Velocity (m/s)	0.20 ~ 30.00	±0.30 m/s
  Flow Rate (m³/min) (DN50)	0.005 ~ 0.200	±0.010 m³/min
  	0.200 ~ 3.500	±1.0% of Full Scale (FS)
  Methane Concentration (%CH4)	0.00 ~ 1.00	±0.04% CH4
  	>1.00 ~ 100.00	±4.0% of True Value
  Carbon Monoxide Concentration (10-6 CO)	0 ~ 100	±4 × 10-6 CO
  	>100 ~ 500	±5.0% of True Value
  	>500 ~ 2000	±6.0% of True Value
  Oxygen Concentration (%O2)	0.0 ~ 25.0	±3% of Full Scale (FS)
  Absolute Pressure (kPa)	10.0 ~ 200.0	±0.75% of Full Scale (FS)
  Temperature (℃)	-10.0 ~ 100.0	±1.0 ℃

• Dimensions: 300 mm × 90 mm × 137 mm
• Housing Material: ABS plastic
• Weight: 1.5 kg