He gave a thorough explanation of the three-wire thermal resistance temperature measurement circuit; his presentation was so moving that even textbooks seemed to cry and bow in admiration. Brother Pig said this while patting his fat belly
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This post was last edited by 1111111 on 2018-4-28 at 12:01. It provides a thorough explanation of the three-wire thermistor temperature measurement circuit; it’s so good that even textbooks are moved to tears and bow their heads in admiration, said Pig Brother, patting his fat belly. . . :If P doesn’t speak well, please hit his mouth – using a brick will do, a shoe will work too, or even poking him with a thermistor will suffice. . Questions are welcome, debates are welcome, and discussions are welcome. .
According to the boss, it refers to thermal resistors; for systems with three or more wires, it’s better to install transmitters directly on-site?
1. Right! You understand correctly, you smart person. . . . . . 2. The closer the sensor is to the signal amplification circuit, the more accurately the signal can be preserved, and the less likely it is to be affected by electromagnetic fields in the surrounding environment. 3. Think about the Rosemont EJA pressure transmitters – think about why they don’t dare to separate the pressure sensor from its wiring and integrate it with an amplification circuit! Once you understand this matter and grasp what my brother meant, it becomes simple.
In our new projects, we basically use integrated temperature sensing systems that convert resistance and thermocouple signals into 4–20mA signals on-site, before sending them to the cabinet room. There are at least several advantages to this: 1. It reduces the transmission distance of weak signals, as mentioned by the original poster, thereby ensuring measurement accuracy. 2. It facilitates distribution in junction boxes; there is no issue in placing it in the same junction box as other similar signals (4~20mA). 3. Reduce the specifications of the main cable.
Thanks to the affordable prices now due to temperature fluctuations, I checked the old prices – foreign companies are really unfair.
Each issue should be analyzed on a case-by-case basis; using temperature control also has its drawbacks, such as increasing the number of failure points and raising costs. Consider your own situation.
Great post – why are there so few people reading it? ，，，Sigh～～～～～～～～～～～
These days, temperature transmitter modules cost just a few dozen yuan; those with a performance rating of several hundred yuan are generally suitable for normal use without any problems. The higher-grade ones cost only a thousand or two thousand.
It seems that nowadays it’s rare to not use local transmitters, right?
The logic is straightforward and clear: it makes sense to equip thermoresistors with transmitters on-site, and this approach is likely to become increasingly common and the standard practice. There will still be those who insist on not using such transmitters, but overall, there will be a wide variety of approaches depending on the specific circumstances and individual perspectives. . . Look at the 6th floor, what do they say? . . . . Many times at Haichuan, I’ve heard people say that increasing temperature variations adds more failure points :lol