Platinum resistance thermometer and integrated temperature-sensitive wiring?

I think I should advise you to change careers; stop working in self-control, okay?

:Lol, go take a look at the popular science post written by Pig Brother...... https://bbs.hcbbs.com/thread-1977228-1-1.html

Check the instructions, or search on Baidu online

1. The three-wire platinum resistor PT100 is connected to the DCS cabinet via instrument wires, transmitting resistance signals. Does the wiring of the field cable (3-core wire) correspond to connecting from points 1 red and 2 blue in the diagram? Is there no bridge circuit on the wiring board inside the platinum resistor junction box, only terminals? Where is the bridge circuit in that section? Is it an RTD card for the DCS cabinet? ===========-A regular thermal resistor consists of three wires, namely 1 red and 2 blue as you mentioned. The three-wire system is used solely to calculate the resistance of the wires; the resistance measured at the safety barrier, minus the resistance of the wires, gives the resistance corresponding to that temperature. There are only three terminals on site; (generally, there are 6 terminals on the unit, one in use and one as a backup, with all wires being duplicated, which is equivalent to having 2 thermometers – if one wire breaks, the other can still be used). The three wires are connected to the safety barrier; as for how the signal is converted from a safety-related format to 4-20mA, that’s not very clear. The wiring is quite complex, and I haven’t studied it. From the safety barrier to the actuator, it is 4-20ma. 2. For integrated temperature sensors, a 4-20MA signal is transmitted; the two-core cable is connected to the AI card in the DCS cabinet. Are the platinum resistance sensors used in integrated temperature sensors of four-wire type or three-wire type? What is the circuit diagram of a temperature transmitter? ============== An integrated transmitter is simply a temperature transmitter attached to a thermometer. Ordinary temperature sensors can be connected to either resistors or thermocouples. It is transmitted to the safety barrier via ordinary signal lines, using a 4-20ma transmission. Circuit diagrams are complicated; since there’s no need to repair the safety barrier, we don’t consider them. 3. When the transmission distance is the same, which one has less error: a platinum resistor or an integrated temperature sensor? Which has a greater transmission distance? =============Signals of 4-20ma have more stable transmission and can travel over longer distances. Now, most devices use temperature variation. For temperature variations that are not suitable for the SIS system, connect it directly in a three-wire configuration to the safety barrier. 4. What are the advantages, disadvantages, and application scenarios of platinum resistors and integrated temperature sensors? =================The accuracy of thermal resistors is divided into Class A and Class B; Class A represents high precision, while the accuracy of Class B is above 0.5%. The accuracy of integrated temperature transmitters is generally divided into three grades: 0.5, 1.0, and 1.5. The temperature transmitter outputs a standard signal, which can be connected directly to the AI card of the DCS. Thermal resistors can only be connected to dedicated thermal resistor clips. It’s not clear whether the cost of using temperature-sensitive components is higher or the cost of employing compensation wires is higher.

If the ambient temperature is high or the corrosive environment is severe, is a platinum resistor more suitable than a thermistor?

If the environmental conditions at that site were truly that highly corrosive, people would die and the company would have closed down long ago.