Have you ever used 24VDC powered two-wire pressure switches or level switches?

Advantages are as follows: 1. Two wires, simple design; incorrect wiring will not damage the meter. 2. Good resistance to interference, with switch signals that can travel over long distances, up to several dozen kilometers. 3. The switch signals are intrinsically safe and explosion-proof, E*aIlCT6

I’ve never seen it; generally, the switches that come with equipment are 4-wire, and I’ve never encountered 2-wire ones. Also, typically DI or DO signals cannot be made intrinsically safe, only Namur switches can. I’m not sure how the intrinsically safe and explosion-proof properties of your switch’s signal were achieved

It features a 4/20mA alarm system: 20mA is output when an alarm occurs, and 4mA is output when the alarm is cleared. By connecting a 250Ω resistor in series in the current circuit and measuring the voltage across this resistor, the 4/20mA current alarm signal can be converted into a 1/5V alarm signal that can be recognized by AD converters. In other words, any DCS or PLC module can recognize this signal. Its application is also simple; for example, during programming, one can use whether the voltage is greater than 3V as the threshold for determining whether an alarm should occur. A detailed explanation is provided in this post: http://bbs.hcbbs.com/thread-1432900-1-1.html. Selection information is available here:.

Hehe, in fact it still converts the transmitter function into a digital output by setting alarm points; this is no different from using a regular transmitter where alarms are set at 4mA and 20mA. Transmitters can be configured for AI input as well as DI input. Some equipment manufacturers, although they provide transmitters, require DI cards – it’s the same principle here. I’m not sure what advantages your product has over transmitters in terms of price

Hehe~ This device is called a “multi-functional signal transmitter.” It’s essentially an enhanced version of a two-wire transmitter. It costs 50 yuan more than a regular transmitter; those 50 yuan can be considered a fee for the intellectual creativity behind this invention, meant as compensation for the person who first came up with the idea. When used to generate a linear 4–20mA output, it functions like a traditional transmitter. When used to produce a switch-type 4/20mA output, it acts as a high/low limit controller. When it generates multi-stage stepped 4–20mA outputs, it functions as an automatic regulator. And when used as a current signal source, it functions as a manual regulator. Its hardware is identical to that of a regular transmitter; what it adds is advanced software functionality. It helps make your control system simpler and more reliable, and it can help you save money – in fact, the amount saved might be much greater than the cost of purchasing this device