4 in 1 Mining Gas Detector Ex

Introduction of 4 in 1 Mining Gas Detector Ex

The JD4(A) 4-in-1 Mining Gas Detector Ex is an intrinsically safe and flameproof portable monitoring device tailored for harsh coal mine environments. Complying with GB/T 3836 series national standards and industry safety specifications, it features the explosion-proof mark Exdb ib I Mb, fully adaptable to explosive gas and coal dust environments underground.

 

This professional detector simultaneously monitors four critical gases: methane (CH4), oxygen (O2), carbon monoxide (CO), and carbon dioxide (CO2). It supports real-time concentration display, automatic over-limit alarm, and continuous environmental monitoring, suitable for personal portable carrying and fixed-point deployment in mine roadways and working faces. It works stably under working temperatures of 0℃ to 40℃, humidity ≤98% (25℃), and wind speed ≤8m/s, meeting all conventional underground operation conditions.

 

Feature of 4 in 1 Mining Gas Detector Ex

1）Precise & Reliable Detection：Equipped with high-sensitivity dedicated sensors, the device delivers accurate detection with graded error compensation for full ranges. It supports fast response—maximum 20s for methane and 45s for carbon monoxide—and dual-level adjustable alarm thresholds for all gases, ensuring no missed or false alarms. Strict factory calibration standards guarantee consistent detection accuracy in long-term use.

 

2）Multi-Dimensional Safety Alarm System：It adopts triple alarm modes of sound (≥80dB), light (visible within 20m in darkness) and vibration. Optional fall detection and 100m wireless linkage alarm enable mutual early warning among multiple devices. The manual emergency alarm function allows staff to actively trigger alerts in dangerous situations, greatly improving on-site risk response efficiency.

 

3）Durable & Portable Design：With an IP68 waterproof and dustproof rating, the device resists harsh underground dust, moisture and impact. Weighing only 259.5g with a compact size of 115×63×41mm, it is easy to carry with a back clip. The built-in dedicated intrinsic safety manganese lithium battery supports over 10 hours of continuous operation, meeting full-shift monitoring demands.

 

4）Humanized Practical Functions：It integrates real-time temperature and humidity display, timing calibration reminder, data storage and export, and customizable screen-off time and password lock. The optional cascading charging function supports 20 devices charging simultaneously, greatly improving charging efficiency for team equipment.

 

Detail photos of 4 in 1 Mining Gas Detector Ex

 

Product parameters of 4 in 1 Mining Gas Detector Ex

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 4 in 1 Mining Gas Detector Ex

Q1: Is the detector available for underground charging?

A1: Strictly prohibited. All charging operations must be completed in safe ground areas with the dedicated X61E power adapter. Underground charging and battery replacement are forbidden to avoid explosion risks.

 

Q2: How to ensure detection accuracy during long-term use?

A2: The device supports regular zero calibration and gas calibration by professional personnel. It has a built-in calibration reminder function to avoid overdue use. If zero drift or inaccurate detection occurs, calibrate it with standard gas immediately; replace aging sensors if calibration fails.

 

Q3: What should I do if the device fails to work?

A3: Common faults include failure to power on (low battery, rechargeable), inaccurate detection (needing calibration), and no alarm (incorrect threshold setting). Do not disassemble the device privately; unauthorized disassembly will void the warranty. Contact the manufacturer for professional maintenance for sensor faults and circuit failures.

 

Q4: What is the warranty policy?

A4: The main unit enjoys a 12-month warranty, and the battery has a 6-month warranty for non-human damage. Artificial damage, unauthorized modification, and use of non-matching accessories are not covered by free warranty services.