1. Assuming that the pressure transmitter and the digital display are used together, and the digital display is not displayed at this time, then the user may say that the pressure transmitter has no output, but in fact, this problem is obvious, and it is unreasonable to hastily determine that the pressure transmitter has no output. Assuming that the pressure transmitter is output normally, it is possible that the digital display is faulty. This is the user's understanding of the on-site faults and the judgment of faults. So how can you tell if the pressure transmitter is working properly? It is very simple, use a multimeter to directly measure the output of the pressure transmitter, and measure whether the current value of 4-20mA is used. Of course, this situation is presented when the time division is used in cooperation with other instruments, and the same multimeter is used to measure the current first.
2. We know that the transmitter needs 24V power supply, assuming that the pressure transmitter has no output, we must first consider whether there is a 24V power supply or whether the 24 power supply is normal, of course, this is the most fundamental electrical knowledge. However, if the scene is like ##点描绘的那样, connected in series with a digital display or other meter with its own 24V power supply, then the pressure transmitter does not need to provide 24V power again. The second aspect is for the use of pressure transmitters on their own.
3. Assuming that the 24V power supply is available and the power supply is normal, and the pressure transmitter has no output at this time, it is necessary to check whether the power cord is reversed and whether the positive and negative poles are connected incorrectly.
4. Assuming that the wiring is correct, then it is necessary to check whether there is a line disconnection in the whole circuit; Maybe check if the meter is wrong (the input impedance should be ≤250Ω), etc.
5. Assuming that the above aspects are normal, then there may be a problem with the hardware of the pressure transmitter. For example, at the beginning of the on-site pressure transmitter, due to a problem with the 24V power supply, the circuit board of the pressure transmitter burned out, of course, there was no direct appearance and no output; For example, the overload and pressure resistance of the selected pressure transmitter are not consistent with the on-site conditions, or the pressure transmitter components may be damaged due to excessive overpressure, and the pressure transmitter will also have no output; For example, if the pressure transmitter is displayed on site, that is, with a gauge, if the gauge head is damaged at this time, then the pressure transmitter will also show no output. Assuming that the meter head is damaged, the two wires directly of the meter head are short-circuited, and assuming that the short-circuit is normal, it is clear that the meter head is damaged.
The above should contain all the common causes of faults, of course, the factors of faults will also change with the change of the scene, the future may present the 6th, 7th reason, but it does not hinder the extremely wide use of pressure transmitters, because at least the above 5 kinds of problems can be said to be the fundamental knowledge scale, of which the 2nd, 3rd, 4th cause analysis is rarely generated, the common attributed to the 1st and 5th, and still easy to deal with.
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