Push-To-Talk over Cellular Solution
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In 2023, an explosion occurred at Panjin Haoye Chemical Co., Ltd., resulting in 13 deaths, 35 injuries, and direct economic losses estimated at around 87.99 million CNY. After on-site inspection, expert technical analysis, and police investigation, the accident investigation team concluded that the cause of the accident was: the four walkie-talkies used for operation command were non-explosion-proof, and the energy point when making a call ignited leaked n-butane and isobutane, causing significant casualties within the impact range of the on-site operation, supervision, and explosion shock wave.
To prevent similar tragedies, the state has explicitly stipulated the mandatory use of wireless explosion-proof walkie-talkies in legislations such as the "Work Safety Law", "Fire Protection Law", and the "Regulations on Safety Management of Hazardous Chemicals." The Ministry of Emergency Management will continue to promote special rectifications in key industries such as mining, hazardous chemicals, firefighting, and the industrial and trade sectors in 2025, with the standardized use of explosion-proof walkie-talkies as a key inspection item. This will significantly promote the development and opportunities in the market for explosion-proof walkie-talkies.
Currently, major domestic telecommunications manufacturers are all involved in the design and manufacture of explosion-proof walkie-talkies, aligning well with the country's emergency policies and requirements. This time, we focus on the explosion-proof walkie-talkie PH990Ex, heavily launched by Caltta. It can be said that this walkie-talkie is specifically designed for high-risk environments, aiming to provide users with safe and reliable communication solutions. With its profound accumulation in the field of communication technology, Caltta combines advanced technology with strict safety standards to create this high-performance walkie-talkie capable of withstanding explosive gas environments.
Next, let's delve into the features, design, and specifications of this walkie-talkie in detail to see how the PH990Ex performs in practical applications and how it meets the communication needs of professional users under extreme conditions.
According to review conventions, let's first take a look at the appearance design and related parameters of Caltta PH990Ex: the design of the PH990Ex explosion-proof walkie-talkie showcases its sturdy and durable characteristics, yet it is made very thin and light with a weight of 410g, making it easier to carry. It adopts a dark-colored shell, mainly black, with striking blue lines along the edges. This color scheme is not only aesthetically pleasing but also facilitates quick identification of the device in various environments. Additionally, the shell is made of special materials to effectively prevent static electricity.
The front of the walkie-talkie features a display screen and multiple function buttons. The display is a 1.8-inch semi-transparent color screen, and the buttons are reasonably arranged to facilitate operation by users wearing gloves or when visibility is poor. The left side features a PTT key and two round multifunctional button keys. The PTT key provides a clear response and comfortable touch when pressed, giving a precise operating experience, and the two functional buttons can be customized according to user habits. The right side has an 18-pin explosion-proof interface that supports both audio and frequency programming. The top includes an antenna, function knob, and an orange alarm button. The back has an anti-slip texture design, which increases stability when held and reduces the risk of accidental drops.
The Caltta PH990Ex is equipped with a large-capacity 1800mAh battery. In analog mode, with a 5-5-90 (i.e., 5% signal transmission, 5% signal reception, 90% standby) testing standard, it can last for 16 hours. In digital mode, with a 5-5-90 testing standard, it can last around 19 hours. It should be able to meet the endurance requirements of long-duration high-intensity scenarios.
The Caltta PH990Ex has a dust and water resistance rating of IP68, designed and produced according to national military standards and American military standards, passing stringent tests for humidity, salt fog, and vibration. The LCD lens also withstood the impact of a 1-kilogram steel hammer in the CCC explosion-proof certification. The entire device can meet the requirements of various harsh usage environments.
Furthermore, the Caltta PH990Ex explosion-proof walkie-talkie integrates both GPS and Beidou dual positioning systems, significantly enhancing positioning accuracy and reliability. More importantly, the PH990Ex supports an independent Beidou positioning configuration, providing domestic users with self-controlled positioning capabilities, ensuring information security in critical areas.
The Caltta PH990Ex explosion-proof walkie-talkie adopts professional explosion-proof design, has passed China's CCC explosion-proof electrical certification and international ATEX certification. This is notable because very few walkie-talkies have obtained both certifications. The PH990Ex features dual certifications for gas and dust explosion-proof, with an explosion-proof rating of Ex ib IIC T4 Gb / Ex ib IIIC T120℃ Db. It can be used in general flammable and explosive gas and dust environments, as well as high-risk gas environments such as hydrogen, water gas, acetylene, and carbon disulfide. So how does the Caltta PH990Ex ensure its explosion-proof performance in design?
The battery is a crucial component for the explosion-proof feature of a portable radio walkie talkie. The Caltta PH990Ex walkie-talkie uses lithium batteries, which have high energy density, long service life, high rated voltage, and low self-discharge rate. The key components of the explosion-proof battery, such as the positive electrode, negative electrode, and electrolyte, are made of high-temperature resistant, corrosion-resistant, and impact-resistant premium materials to reduce the risks of heating and explosion.
The shell of the PH990Ex explosion-proof battery is made of high-strength, impact-resistant, and corrosion-resistant explosion-proof materials. These materials can effectively withstand external collisions and squeezes to prevent the battery from being damaged by external forces, making it suitable for various harsh environments such as chemical plants and mines. Additionally, the PH990Ex explosion-proof battery has excellent insulation and anti-static capabilities, effectively preventing the accumulation of static electricity, which reduces the risk of sparks or arcs that may trigger explosions.
The PH990Ex explosion-proof battery has a built-in protection circuit that can monitor the battery's temperature, voltage, and current in real-time. If any abnormal situation is detected, such as excessively high temperature, abnormal voltage, or excessive current, the protection circuit will quickly activate to prevent further damage or explosion by means of disconnecting or discharging the battery.
The PH990Ex explosion-proof walkie-talkie uses high-quality encapsulation materials and advanced potting technology. The components are surrounded by adhesive, ensuring that the elements do not come into direct contact with the air, effectively isolating them from external environmental interference, reducing the risks of short circuits and fires, and significantly enhancing the intrinsic safety performance of the PH990Ex walkie-talkie.
The image below shows the mainboard after disassembling the walkie-talkie, with the shielding cover. By opening the shielding cover in the red area, you can see the internal potting process.
Given that the Caltta PH990Ex will be used in extreme noisy environments such as chemical factories, it is crucial to test the voice quality in such scenarios. We used methods to simulate noisy environments to conduct actual voice testing. For the real experience, we included a test video:
From the video, you can see that even in a noise environment as high as 120 decibels, the PH990Ex still maintains the continuity of communication and the clarity of voice. This performance is pivotal for personnel working in noisy workplaces such as construction sites, mines, or chemical plants. It ensures that crucial commands and information can be accurately transmitted even under the harshest conditions, thereby improving work efficiency and safety. So why is the voice quality of the PH990Ex so good? The Caltta PH990Ex explosion-proof walkie-talkie employs advanced audio processing technology, providing clear and understandable voice communication in high-noise backgrounds. Its built-in noise suppression algorithm effectively reduces background noise interference, ensuring voice clarity and accuracy.
The PH990Ex's desktop charger is a professionally graded explosion-proof charger designed according to national standards. The explosion-proof charger can protect the circuit safety of the main unit and battery, effectively preventing risks of explosion-proof failure of the main unit and battery due to charging anomalies. The details are well-implemented.
Additionally, the Caltta PH990Ex comes equipped with a variety of explosion-proof accessories, fully considering the need for safe communication in various complex environments. These accessories include: shoulder microphones, heavy noise-canceling headphones, bone-conduction headphones, low-temperature batteries, and eight-position chargers.
For the domestic market, the PH990Ex supports Beidou, NVOC vocoder, PDT digital trunking, and national standard encryption technology. These domestic standards make it more compatible with the usage requirements of firefighting, emergency services, and other government departments for domestic explosion-proof terminals.
Reflecting back on the 2023 Panjin Haoye Chemical Co., Ltd. explosion accident, if professional explosion-proof walkie-talkies had been used at that time, the explosion could have been avoided. For instance, the Caltta PH990Ex, designed according to stringent international explosion-proof standards, optimizes its circuit design and structure to keep the connection energy below the safe threshold, well below the minimum ignition energy of n-butane and isobutane, effectively mitigating potential ignition sources.
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