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Review the fire, smoke, odor, power supply changes, lightning, wetness, misoperation, and mishandling before the failure.
2. Intuitive method:
Observe the external damage of the circuit, the leakage of the pressure guiding tube, the overheating of the circuit, and the status of the power supply switch.
1) Disconnection detection: Separate the suspected faulty part from other parts to see if the fault disappears. If it disappears, determine the fault. Otherwise, you can find the next step, such as: Smart differential pressure transmitter can not be normal Hart remote communication , The power supply can be disconnected from the body, and the transmitter is powered on for communications by adding power to the site to see if the cable is overlaid with an electromagnetic signal of about 2 kHz to interfere with the communication.
2) Short-circuit detection: In the case of ensuring safety, the relevant part of the circuit is directly shorted, such as: the output value of the differential transmitter is too small, the pressure tube can be disconnected, and the differential pressure signal is directly from the pressure-receiving valve at one time. Directly lead to both sides of the differential pressure transmitter, observe the transmitter output, to determine the plugging and leakage connectivity of the pilot pressure pipeline.
3) Replacement test: Replace the suspected defective part and determine the fault location. For example, if you suspect that the transmitter circuit board has failed, replace it temporarily to determine the cause.
4) Division detection: The measurement loop is divided into several parts, such as: power supply, signal output, signal transmission, signal detection, according to sub-section inspection, from the simple to the complex, from the table and in, narrow the scope, to identify the fault position. :_$Q
Differential Pressure Transmitter/Pressure Transmitter No Output How to Debug Differential Pressure Transmitter Pressure Transmitter No Output How to Debug? Transmitter without output is often encountered, common faults in the transmitter failure. In fact, under normal circumstances, the differential pressure transmitter pressure transmitter measurement part is all welded, for the electronic part of the wave soldering and connector installation, it can be said that the differential pressure, pressure transmitter The overall structure is very sturdy and durable, and there are generally few failures. Under normal circumstances, if a fault occurs in a sensitive part, the individual cannot repair it. Contact the manufacturer to replace the entire part.
In the use of differential pressure transmitter pressure transmitter, there is often no output failure, as long as the user to properly debug it can generally be resolved. For the output-free commissioning of the pressure transmitter, the general steps are as follows:
1. Check whether the power supply of the differential pressure transmitter is reversed, and whether the positive and negative polarities of the power supply are correct.
2. Measure the power supply of the transmitter. Is there a 24V DC voltage? Ensure that the power supply voltage to the transmitter is ≥12V (ie, the voltage at the input of the transmitter power supply is ≥12V). If there is no power, check whether the circuit is broken, whether the instrument is selected wrongly (input impedance should be ≤ 250Ω) and so on.
3, if the pressure transmitter is with a header, you need to check whether the header is damaged (you can short the first two lines of the header, if the short circuit is normal, then the header is damaged), if the header is damaged, You need to change the header.
4. If there is a problem with the differential pressure transmitter, connect the current meter to the 24V power supply circuit to check if the current is normal. If it is normal, the transmitter is normal. At this time, check whether other instruments in the loop are normal.
5. If the power supply is connected to the transmitter power input, connect the power cable to the power port.
Differential Pressure Transmitter Pressure Transmitter The steps for no output debugging are basically the above situations. Of course, in practical applications, there may be many problems causing the differential pressure transmitter to not work properly. Before installation and use, it is recommended that everyone should seriously take the trouble.
Differential Pressure Transmitter Fault Diagnosis and Analysis in Application
1. Investigation method: