| Quantity: | |
|---|---|
The GJJ100B is an intrinsically safe fixed laser methane sensor for underground coal mines. It adopts TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology to identify methane via characteristic gas spectra. Developed for continuous online gas monitoring in underground coal mines, it conducts long-term fixed-point real-time methane concentration collection and transmits data to mainstream coal mine safety monitoring systems such as the KJ90X series. Serving as a replacement for traditional catalytic combustion gas sensors, it acts as a core terminal device for underground online methane monitoring.
Product Advantage
1. Adopts TDLAS laser detection to identify methane specifically, free from interference of water vapor, dust and mixed gases. No catalytic element poisoning or aging occurs with tiny zero drift and long-term stable performance.
2. Measuring range 0～100%VOL with high precision at low concentrations, applicable to both conventional measuring points and high-concentration gas drainage pipelines.
3. Built-in automatic temperature and pressure compensation ensures stable accuracy despite underground environmental fluctuations.
4. Greatly extended calibration cycle reduces maintenance frequency and costs, and the service life is longer.
5. Dual output of frequency signal and RS485 digital signal, compatible with all mainstream coal mine monitoring systems without additional adapters.
6. Infrared remote calibration without opening the explosion-proof housing ensures safe commissioning; natural diffusion sampling eliminates external air pumps for easy wiring and installation.
7. Equipped with local digital display and over-limit audible & visual alarm. The intrinsically safe stainless steel shell is dustproof and moisture-proof for 24-hour continuous online monitoring.
8. Supports linkage with monitoring systems to realize power cut-off and ventilation-gas interlock upon gas overrun, meeting coal mine safety interlock standards.
Technical Parameters
Parameter | Specification |
Sampling Method | Passive Diffusion |
Measuring Range | 0 ~ 100%VOL (CH4) |
Basic Error | 0.00 ~ 1.00%VOL:±0.05%VOL;1.00 ~ 100%VOL:±5% of the true value |
Resolution | 0.01%VOL |
Response Time (T90) | ≤25s |
Alarm Threshold | 0 ~ 4%VOL,arbitrarily adjustable (factory default:1%VOL) |
Operating Temperature | 80 ~ 116kPa |
Anti-interference Level | RF anti-interference level 4 |
Rated Operating Voltage Current | 12 ~ 24VDC (typical:24VDC) |
Whole Machine Power | Built-in lithium manganate battery,online automatic charging |
Backup Battery Life | >0.4h (after power failure) |
Product Uses
1. Real-time methane monitoring for mining faces, tunneling faces and upper/lower corners.
2. Online gas monitoring of main return airways and district return airways.
3. Gas detection in electromechanical chambers, substations and pump rooms.
4. Continuous high-concentration methane detection for gas drainage pipelines.
5. Gas leakage monitoring of sealed walls and wind barriers.
6. Gas monitoring for roof caving areas and rock fractures.
7. Support gas power-off and ventilation interlock with mine safety monitoring system.
FAQ
Q: What's the lead time for orders?
A: Within 20 days after first payment.
Q: Do you provide sample? Free or charge?
A:Free samples are available, courier cost is borne by the buyer.
Q: How do you guarantee quality?
A: Always a pre-production sample before mass production;
Always final inspection before shipment.
Q: What documents do you provide for export?
A: Full export package (Commercial Invoice, Packing List, Bill of Lading, COC, etc.).
Q: How do I place an order?
A: Contact us via email/phone for a quote, then confirm with a PO.
