Mining Multi Gas Detector

Introduction of Mining Multi Gas Detector

The JD4(A) Mining Multi Gas Detector is a portable, intrinsically safe and flameproof gas detection device specially developed for underground coal mines and tunnel operation environments. Complying with national and industry standards including GB/T 3836 series and AQ/T 6207-2007, it features the explosion-proof mark Exdb ib I Mb, adapting to harsh mining conditions with temperatures from 0℃ to 40℃, relative humidity up to 98% and air pressure of 80kPa to 116kPa.

 

This detector supports real-time continuous monitoring of four core gases: methane (CH4), oxygen (O2), carbon monoxide (CO) and carbon dioxide (CO2). It can automatically trigger comprehensive alarms when gas concentrations exceed or fall below preset thresholds, effectively preventing gas explosion, hypoxia poisoning and other safety hazards. Lightweight and compact (115.0mm×63.0mm×41.0mm, 259.5g including back clip), it is applicable for personal portable use and fixed-point monitoring in mining sites, serving mine ventilation and safety management personnel efficiently.

 

Feature of Mining Multi Gas Detector

1)Accurate & Sensitive Detection Performance

The device adopts high-precision professional sensors with graded error control for different gases, ensuring reliable detection accuracy across the full measurement range. It delivers fast response speeds, with the fastest CH4 response within 20 seconds and stable detection data. Two-level adjustable alarm thresholds are factory-calibrated for all four gases, covering conventional mine safety warning standards, with tiny alarm errors to guarantee timely and accurate risk reminders.

 

2)Multi-Dimensional Full-Alarm System

Equipped with sound, light and vibration triple alarm functions, it achieves an alarm sound intensity of over 80dB (1 meter away) and visible alarm light within 20 meters in dark environments. It supports manual emergency alarm, gas over-limit automatic alarm and calibration expiration reminder. Optional fall detection and 100-meter long-distance linkage alarm functions enable multi-device collaborative warning, realizing all-round personnel and environmental safety monitoring.

 

3)Durable & Explosion-Proof Industrial Grade Design

With IP68 high-level protection, the device works stably for 40 minutes under 1.1-meter water immersion, adapting to humid and dusty mining environments. The built-in customized manganese lithium battery pack with intrinsic safety protection supports over 10 hours of continuous operation. All internal circuit components are strictly standardized, with no arbitrary parameter modification allowed, ensuring long-term stable operation in explosive gas environments.

 

4)Rich Practical Custom Functions

It integrates real-time temperature and humidity display, data timing storage and export, screen-off time adjustment, 4-digit password protection and factory reset functions. The optional cascading charging function supports 20 devices charging simultaneously with one adapter, greatly improving charging efficiency. Professional zeroing and calibration modes for different gases ensure long-term detection precision of the instrument.

 

Detail photos of Mining Multi Gas Detector

 

Product parameters of Mining Multi Gas Detector

Item	Parameters
Detectable Gas Types	Methane (CH4) Oxygen (O2) Carbon Monoxide (CO) Carbon Dioxide (CO2)
Detection Range	CH4: (0.00～4.00)%CH4 O2: (0.0～30.0)%O2 CO: (0～1000)×10 CO CO2: (0.00～5.00)%CO2
Basic Accuracy Error	CH4: ±0.10%CH4 (0.00～1.00%)±10% of true value (1.00～3.00%)±0.30%CH4 (3.00～4.00%) O2: ±0.5%O2 (0.0～5.0%)±3%FS (5.0～30.0%) CO: ±2% (0～20×10 CO)±4% (＞20～100×10 CO)±5% of true value (＞100～500×10 CO)±6% of true value (＞500～1000×10 CO) CO2: ±0.10% (0.00～0.50%)±(0.05 + 5% of true value) (0.50～5.00%)
Alarm Performance	Alarm Performance
Alarm Signal	Three-dimensional alarm: sound, light and vibration
Alarm Sound Intensity	≥80dB(A) (1 meter away from the buzzer)
Alarm Visibility (Light)	Visible distance ≥20m in dark environment
Two-Stage Alarm Threshold (Full range adjustable)	CH4: Factory primary alarm point: 1.00%CH4; Secondary alarm point:1.50%CH4 O2: Factory primary alarm point: 18.0%O2; Secondary alarm point: 16.0%O2 CO: Factory primary alarm point: 24×10-6 CO; Secondary alarm point: 48×10-6 CO CO2: Factory primary alarm point: 1.0%CO2; Secondary alarm point: 1.5%CO2
Alarm Error	CH4: ±0.05%CH4 O2: ±0.3%O2 CO: ±1×10 CO CO2: ±0.04%CO2
Response Time (Flow rate: 250mL/min)	CH4: ≤20s O2: ≤35s CO: ≤45s CO2: ≤30s
Main Functions	Main Functions
Fall Alarm (Optional)	The detector can monitor the fall status of the wearer and display the fall icon under normal gas concentration conditions. It can also trigger fall detection when gas concentration exceeds the limit. With linkage alarm enabled, fall alarm signals will be automatically sent to detectors within 100 meters (visible distance).
Linkage Alarm (Optional)	When enabled, linkage alarm is available within 100 meters (visible distance). Frequency range: 2400～2525MHz; Maximum wireless transmit power: ≤20dBm.
Emergency Alarm	Long press the emergency alarm button to activate the manual alarm interface and actively send alarm signals to surrounding detectors.
Calibration Reminder	Once enabled, the detector will pop up an over-calibration reminder on startup when the calibration period expires.
Temperature & Humidity Detection	Real-time temperature and humidity display on the monitoring interface.
Password Setting	4-digit password available for menu access and shutdown permission; factory default: disabled.
Factory Reset	Clear stored data and custom settings to restore factory defaults.
Screen-off Time	Adjustable: 0 (always on) or 1～20 minutes.
Data Storage Interval	Customizable interval for real-time data collection and storage.
Time Setting	Adjustable year, month, day, hour and minute.
Data Export	Supports exporting dated alarm data via the dedicated charging base.
Cascade Charging (Optional)	The charging base supports cascade connection for up to 20 units, enabling simultaneous charging of 20 detectors with a single adapter.
Power Supply	Power Supply
Continuous Working Time	≥10 hours under normal working conditions*Subject to operating status, alarm frequency and activation of indicator lights & reminder functions
Battery Specification	Intrinsic safety power supply: 2 parallel lithium manganate batteries, Model: QHPW 674048, 1120mAhMaximum open-circuit voltage (Uo): 4.3VMaximum output current (Io): 2.1ARated working voltage (Ue): 3.7VEquipped with two-stage protection circuit and encapsulated with epoxy resin to form an intrinsic safety battery assembly.
Dimension & Weight	Dimension & Weight
Overall Dimension	Approx. 115.0mm×63.0mm×41.0mm (including back clip)
Weight	Approx. 259.50g (including back clip)
Protection Grade	Protection Grade
IP Rating	IP68 (1.1m water depth, 40 minutes duration)

 

FAQ about Mining Multi Gas Detector

Q1: Can the detector be charged and maintained underground?

A1: No. All charging operations must be completed in a safe ground area, and the device must be powered off before charging. Underground charging and battery replacement are strictly prohibited to avoid explosion risks. Professional maintenance must be conducted by trained personnel without changing the specifications of intrinsic safety circuit components.

 

Q2: How to solve inaccurate detection data?

A2: First, perform gas zeroing and professional calibration according to the standard process. If the data is still inaccurate after repeated calibration, it indicates sensor aging or failure, and the sensor needs to be replaced. Daily regular calibration can effectively maintain detection accuracy.

 

Q3: What is the continuous working time and charging cycle?

A3: The device supports more than 10 hours of continuous operation under normal working conditions. The full charging time is 4 to 5 hours, with a steady red light indicating full charge. Low battery will trigger a dripping reminder and automatic shutdown, requiring timely charging.

 

Q4: What are the storage and transportation requirements?

A4: It is suitable for various conventional transportation modes, avoiding severe vibration, impact and corrosive substance mixing. The storage temperature ranges from -40℃ to +60℃, and it needs to be stored in a dry, ventilated environment free of sulfide and silicide hazards with regular inspection and maintenance.

 

Q5: What is the warranty policy?

A5: The main unit enjoys a 12-month warranty, and the battery has a 6-month warranty for non-human damage. Damage caused by unauthorized disassembly, man-made collision, over-service life and force majeure is not covered by free warranty.