Issues related to the use of thermal resistors
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I personally guess that at the current stage, the three-wire connection method is still primarily used for thermistor temperature measurement. Excuse me, dear users. In the three-wire wiring method for thermal resistors in your respective companies, which of the following is used most frequently? 1. The leads of the thermal resistor elements used are two-wire type (that is, there are only two wires and two terminal blocks inside the thermal resistor’s junction box). 2. The leads of the thermistor element used are three-wire (that is, there are three wires and three terminals in the thermistor’s terminal box). 3. Are there any four-wire types (i.e., those in which there are four wires and four terminal blocks inside the wiring box of the thermal resistor)? Is it a true four-wire system, or are the four leads used as if they were part of a three-wire system?
I have used both of the first two types; when requirements are not high, a resistor core with two leads is generally used, while those with high shielding precision use three wires. I’ve never seen a four-wire version, but our unit has a double-armored type with six terminals. What’s the meaning of four lines? Solve?
Is it the four-wire type, with four terminals? . .
I’ve never used second-line products; for single units, I’ve only used third-line ones. I’ve never even seen fourth-line products, but I have used six-line products in pairs. The third wire is used to compensate for the return resistance; why is a four-wire system used? It’s unlikely that four wires are used just to improve detection accuracy; is it for noise resistance? Who can clarify this and also help me gain some knowledge?
The high-precision thermistor used for laboratory comparison is four-wire type. The 3-wire system is generally used in industrial applications; sometimes temperature is utilized for compensation calculations, and the 4-wire system is chosen for more accurate measurements. 2-wire systems are rarely used nowadays. If the temperature requirements aren’t strict and the distance is short, then go ahead and use it.
2. The leads of the thermistor element used are three-wire (that is, there are three wires and three terminals in the thermistor’s terminal box). I have used both three-wire and four-wire systems; the three-wire system is the one that is connected directly to the safety barrier.