Thermocouples have positive and negative poles. Reverse connection will affect the measurement data. Generally, the red wire is connected to the positive pole, and the other colored wires are connected to the negative pole. The thermocouple plug is generally marked with a "+" sign for the positive electrode and a "-" sign for the negative electrode.
K-type thermocouples have good linearity and large thermoelectromotive force, so they can be used in oxidizing and inert atmospheres. However, K-type thermocouples cannot be directly used in sulfur, reducing or reducing and oxidizing alternate atmospheres and vacuums at high temperatures, nor are they recommended for use in weakly oxidizing atmospheres. Its positive electrode is a nickel-chromium alloy containing 10% chromium, and the negative electrode is a nickel-silicon alloy (KN) containing 3% silicon. Therefore, how to divide the positive and negative poles of the armored thermocouple? According to this characteristic, the positive and negative poles of the sheathed thermocouple can be easily identified with a magnet. As for other distinctions, it is also very simple. The first is the nickel-chromium-nickel-silicon thermocouple. Its two wires have obvious color distinctions, one is green, the other is gray, and the green is the positive electrode. If it is an armored thermocouple Even wire, you can use a small magnetic material and put it on the negative side, which is the gray wire. If it is attractive, this is the negative electrode.
How to distinguish the positive and negative electrodes of thermocouples1. Look at the color, green is positive and gray is negative. The red compensation wire is positive, and the other wire is different in material and color.
2. Bend it with your hand, the positive pole is relatively hard.
3. Use a magnet to suck it up, and the larger magnetic force is the negative electrode.
4. Measure MV with a multimeter, it shows positive, and the measuring end with a positive bar is positive (this needs to be measured after the temperature of the hot end rises, if it is cold, the hot end is at room temperature and cannot be measured)
5. The sensor is checked normally, and the transmitter has no fault display, but it is suspected that the temperature is too low or too high, then the handheld communicator 475 is required to check the transmitter configuration, whether it is set according to the sensor model.
6. The meter head of the field transmitter displays normally, the DCS displays a red frame, and the temperature maintains a certain value. Appears to be a communication failure.
â‘ Check whether the wiring of the transmitter and the wiring in the junction box are loose. Because the wiring is loose, the voltage drop will be too large, which will affect the communication. (There is water in one meter on one network segment, which may affect the communication of other meters).
â‘¡ Power off and restart the transmitter. If the fault persists, the device description (DD) file may be lost or damaged, or the file version is too low and needs to be upgraded. Contact TS to download again.
â‘¢You can change the address of the socket on SINGMENT (usually there are spares), and then contact TS for re-addressing. If the fault remains the same, there should be a problem with the transmitter communication module. Replace the card board.
7. Transmitter black screen, no light, no voltage drop, replace the card board.
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Insulation PVC
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Speaker Cable wire is used to make the electrical connection between loudspeakers and audio , speaker wire consists of two or more electrical conductors individually insulated by plastic or, less commonly, The two wires are electrically identical, but are marked to identify the correct audio signal polarity. Most commonly, speaker wire comes in the form of zip cord.
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