Have you ever wondered why the price display in a gas station can withstand the oil and gas environment? How to prevent dust and explosion-proof large screens in chemical plants? These ordinary screens are hidden behind them. Today we will talk about this professional and somewhat mysterious field - the purchasing path of LED explosion-proof display screens.

​​1. Explosion-proof screen is not an ordinary display screen with a shell​​
You may not believe it if you say it, 60% of the so-called "explosion-proof screens" on the market have not passed the professional certification at all. A true explosion-proof display screen must meet three hard indicators:

• ​​Structural explosion-proof​​: The seams of the box must be sealed with a maze, just like wearing three layers of protective clothing on the screen
• ​​Circuit protection​​: The driver power supply must be equipped with overload protection, and the power will be automatically cut off when encountering electric sparks.
• ​​Material resistant to manufacturing​​: The surface must be made of aviation-grade aluminum. The projects we have made for the chemical factory are even 316 stainless steel.

Last year, a customer bought a copycat with greed for cheapness, but the screen was short-circuited and smoked after two months of use in a dusty environment. Later, I replaced the equipment that complies with the ATEX standard and did not fail for three consecutive years.

​​2. You must check these five acupoints for purchasing explosion-proof screens.​​

1. ​​Certification mark identification eyebrow​​: Determine the Ex logo and IP protection level, for example, at least IP65+Ex d IIC T6 is required in chemical engineering scenarios.
2. ​​The heat dissipation design is the lifeblood​​: A good cooling system can double the screen life. For example, the projects we have done for tropical areas, all come with intelligent temperature-controlled fans.
3. ​​Be smart in brightness adjustment​​: You have to withstand the direct sun during the day, and you can't blind you at night. Our latest solution can automatically adjust 500-7500nit brightness according to ambient light
4. ​​Convenient maintenance channels​​: Modular design is so important! The screen installed on the marine platform last time, the repairman wore a gas mask and replaced the faulty module in 10 minutes.
5. ​​The after-sales team must be reliable​​: The 24-hour response is not just a joke. There was a problem in Southeast Asia at 2 a.m. The engineer solved it in half an hour after video guidance.

​​3. How to break the price fog? ​ ​
You must have encountered this situation - the same size explosion-proof screen, manufacturer A quotes 50,000 yuan, and manufacturer B dares to ask for 150,000 yuan. The main tricks here are:

• ​​Material Cost​​: The price difference between ordinary tempered glass and explosion-proof glass starts from 3 times
• ​​Certification Fees​​: The international certification optical inspection fee will cost more than 100,000 yuan
• ​​Technical Solution​​: The intelligent monitoring system is 40% more expensive than the basic model, but it can save 30% of the operation and maintenance cost

There is a bloody case: a logistics warehouse bought a low-end version with cheap pictures, but the three-year maintenance fee is 80,000 more than the purchase money saved at the beginning. Therefore, buying a explosion-proof screen requires a full life cycle account.

​​Self-question time​​
Q: Can those who claim to be military-level online trust?
A: Just like online shopping for "military quality" flashlights, real military products are not allowed to be sold casually. It depends on whether the manufacturer has actual military supply cases. For example, we have participated in a project at a border post, and the equipment must be able to work normally from -40℃ to 70℃.

Q: Is it cost-effective to customize in small batches?
A: It depends on the complexity of the process. For special shapes like arc explosion-proof screens, ordering from 50 square meters is only cost-effective. However, some manufacturers have now launched standardized special-shaped modules, which can achieve the desired effect even if you have 10 square meters.

Q: How to verify explosion-proof performance?
A: The easiest way is to have a third-party inspection report. Each batch of goods comes with a blasting test video from a national laboratory. You dare to put the screen in a simulated explosion environment to test it.

​​4. Hidden knowledge points for installation and maintenance​​
Last year, I encountered a difficult problem when installing screens for chemical plants - signal transmission in explosion-proof and non-explosion-proof areas. Finally, an optical fiber isolation solution was used, and a three-level explosion-proof junction box was added in the middle. Here are some key points to remind you:

1. The wiring must be worn with explosion-proof metal pipes, and the plastic sleeve is a time bomb at high temperatures.
2. The distribution box should be more than 3 meters away from the hazardous source, and it is best to install it on the outside of the isolation wall.
3. The grounding resistance cannot be greater than 4Ω, and an ionic grounding electrode must be installed in humid environments.
4. You have to do airtightness tests twice a year, so you must not save this money

The editor finally said something heart-wrenching: Buying an explosion-proof display screen is like buying insurance. I usually think it is not useful, but I only know if something really happens. Those equipment that can withstand the damage for five years is definitely not based on luck, but on solid technical accumulation. When purchasing next time, remember to let the manufacturer take you to see their aging laboratory - it is really reliable that can simulate the use environment for ten years!

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