How to correctly choose a temperature and humidity sensor for computer rooms?
There are currently a variety of Ethernet temperature and humidity sensors on the market, which can also be called IP temperature and humidity sensors. They are a mixed bag of good and bad. It seems that the RJ45 network interface is an Ethernet temperature and humidity sensor. Just looking at the technical indicators and parameters on the promotional page, they seem to be almost the same, which brings confusion to engineers. Which type of sensor should they choose? ? Based on actual testing and on-site understanding, the author has summarized the following points to make a choice for the reference of engineers:
1. Professionalism. Whether a company is professional depends on its status in the industry, whether its equipment is advanced, and whether it has made any achievements in the technical field. The company’s establishment time is also an evaluation criterion. After all, it has been established for a long time. , relatively mature in terms of experience and technology.
Humidity measurement is not simply a technical issue. As a composite technology of electronic technology and physical chemistry, experience is very important. The ignorant are fearless. Not all electronic engineers understand this, especially the design of production processes. Making a product and producing it are different experiences.
So unlike copycat collection, it is more secure to choose a professional company with a history. After all, we do not buy these sensors for our own use, but for customers. It is very important to have quality assurance.
2. Equipment, temperature and humidity sensors have accuracy requirements. It is very important to have relevant calibration equipment to calibrate the products before leaving the factory. Either the accuracy of the device is the accuracy of the finished product. A high-precision humidity environment is expensive, and it must be calibrated against national standards and obtain a calibration certificate every year. These should be checked clearly with the manufacturer. Product accuracy of 3% requires at least 1% of equipment to guarantee it.
3. Batch. The production batch of the product is very important. Without the batch of the product, the reliability of the device is not guaranteed. You must know that IC manufacturers usually do not accept small batch orders, and cheap old ICs in the electronic market are refurbished. IC is mainstream. This is also the reason why the product quality of some small factories is unstable.
A simple way to judge the batch size of a product is to see whether the product’s shell uses a general shell or a specially molded shell. Usually only mass-produced products will have molds.
4. Security, in the network field, is threatened everywhere. Data security issues are very important. At present, most manufacturers choose products with integrated protocols for Ethernet interfaces. However, these integrated modules are usually used in commercial situations and are factory-set in the most convenient way. They are not secure enough and are easily modified and attacked by the network. The author has experienced this type of product, which was used on the public network. After 2 to 3 months, the network parameters were modified. Therefore, professional manufacturers generally reprocess this and rewrite the underlying program to enhance its security.
5. Appearance design. Usually I like to choose products that meet the standards. Products that meet the size are easy to install. Pluggable terminals or connectors are important, otherwise future wiring construction and maintenance will be a pain. These details reflect the manufacturer’s attentiveness to the product. As for aesthetics, it’s a matter of opinion. I prefer compact products.
6. Function, a true Ethernet temperature and humidity sensor should be able to support POE power supply, support multiple network protocols such as TCP/UDP/SNMP, and be compatible with any third-party network management software. 
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