Dingjian intrinsically safe explosion-proof handheld terminal has built a hard-core explosion-proof system from the laboratory to the underground through the three core technologies of intrinsically safe design + multi-modal communication + intelligent sensing. The specific explosion-proof principles and technical details are as follows：

Intrinsically safe circuit design: Eliminate the risk of explosion at the source

low energy limit: Adopting low voltage and low current circuit design, the spark or thermal effect energy is strictly controlled below the minimum ignition energy of explosive gas or dust. Complying with GB 3836.4, IEC60079-11 and other standards, it is suitable for hazardous areas such as ATEX Zone 1/21 and IECEx Zone 1.

Security level certification: Passed Ex ib IIC T4 Gb certification and supports ia/ib/ic three-level security levels. The circuit parameters are strictly limited to ensure that the energy does not exceed the standard under fault conditions.

No dependence on flameproof enclosure: There is no need for a bulky explosion-proof enclosure, and intrinsic safety is achieved through circuit energy limitation. It is suitable for scenarios from Zone 0 (continuous explosion environment) to Zone 2 (possible explosion under abnormal conditions).

Industrial grade protection and material design: Adapt to extreme environments

Housing protection: Made of high-strength aluminum alloy + anti-static coating, the impact resistance reaches IK10 standard (can withstand 10J energy impact) ； The IP68 waterproof and dustproof rating supports immersion in 1.5 meters of water for 30 minutes, withstands extreme temperatures from -40°C to 80°C, and is suitable for underground wet, dusty, high/low temperature environments.

Sealing and corrosion protection: The shell is made of polycarbonate + fiberglass composite material, which is resistant to corrosion in acidic environments. ； Key parts adopt a sealed structure to prevent the intrusion of dust and moisture to ensure electrical insulation strength.

battery safety: Built-in double protection circuit supports automatic cut-off of overcharge, over-discharge, short circuit and thermal runaway ； Equipped with temperature and pressure sensors to monitor environmental parameters in real time, it will automatically alarm and shut down the equipment when abnormal.

Multimodal communication and positioning: Real-time data exchange and emergency response

communication capability: It supports 5G/4G full network, Wi-Fi 6, Bluetooth 5.3 and Beidou + GPS dual-mode positioning (centimeter-level accuracy). It combines UWB ultra-wideband technology to realize centimeter-level trajectory tracking of personnel/equipment in closed spaces such as underground tunnels and pipe corridors, and shortens accident response time by 70%.

emergency communications: In areas without public network coverage (such as desert hinterlands and deep-sea platforms), direct instructions can be ensured through Beidou short messages or satellite communications. ； It supports DMR digital intercom to achieve millisecond-level group response, and the 5G private network ensures real-time backhaul of high-definition video to build a holographic digital twin system.

Personnel positioning and trajectory tracking: Combining UWB technology to achieve centimeter-level positioning of underground personnel, the electronic fence function monitors illegal entry into high-risk areas in real time, and the trajectory can be traced to an accuracy of 30 centimeters, reducing the risk of accidents.

Intelligent sensing and early warning: Risk prediction and closed-loop management

Environmental Monitoring: Integrates multi-gas sensors (methane, carbon monoxide, hydrogen sulfide) with ppm-level sensitivity and a response time of less than 3 seconds. It captures parameters such as temperature, humidity, and hazardous gas concentrations in real-time; if thresholds are exceeded, it automatically triggers audible and visual alarms and initiates emergency response protocols (such as automatically closing valves or activating ventilation systems).

AI edge computing: Equipped with an AI chip, it supports local analysis of sensor data, predicts mechanical failures (such as warning of abnormal equipment vibration 48 hours in advance), and links emergency plans. ； The integrated thermal imaging camera monitors fire sources and the location of trapped personnel, supports multi-department collaborative operations, and increases emergency command efficiency by three times.

Data collection and sharing: Automatically record equipment status and pressure parameters through NFC/QR code scanning, and upload the data to the ERP/MES system in seconds. The manual error rate is reduced by 85%, and the data collection efficiency is increased by 50%.

Compliance with regulations and standards: Compliance and reliability assurance

Explosion-proof certification: Passed Ex ib IIC T4 Gb certification, complies with international standards such as ATEX Zone 1/21 and IECEx Zone 1, and is suitable for Class II Class C gas environments ； It has passed the MA mark certification and complies with regulatory requirements such as the "Coal Mine Safety Regulations" to ensure the legal use of the equipment in the underground environment.

Standard system: Strictly follow the GB 3836 series of standards to ensure that the explosion-proof performance complies with national and international standards ； Regularly pass testing and verification by third-party certification agencies (such as electrical performance testing, environmental adaptability testing) to ensure continued compliance with safety standards.

Dingjian intrinsically safe explosion-proof handheld terminals achieve hard-core explosion-proof capabilities from the laboratory to underground through intrinsically safe circuit design, high-protection-level housing, multi-modal communication, intelligent sensing and early warning systems, and strict explosion-proof certification. Its core is to limit circuit energy from the source and combine industrial-grade protection and intelligent technology to ensure safe and reliable operation in flammable and explosive environments. At the same time, it improves production efficiency and safety levels through real-time data exchange and risk prediction, and has become a key tool for the digital transformation of petrochemical, mining and other industries.

Dingjian focuses on the R&D, production and sales of three-proof communication products such as single Beidou handheld terminals, Beidou short message terminals, RTK high-precision positioning terminals, single Beidou explosion-proof intercom terminals, explosion-proof mobile phones, anti-confidential mobile phones, 5G single Beidou law enforcement recorders, satellite communication phones, etc. It supports customized Hongmeng systems, secondary development, and provides one-stop communication equipment application solutions.