How to debug a pressure transmitter with no output

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This post was last edited by jinhuzhongrui on 2012-12-25 at 14:38. How to debug a differential pressure transmitter/pressure transmitter that has no output? A situation where the transmitter has no output is quite common, and it is one of the frequent faults in transmitters. In fact, under normal circumstances, the measurement mechanism of differential pressure transmitters/pressure transmitters is fully welded, while the electronic circuitry is typically assembled using wave soldering and connectors. It can be said that the overall structure of differential pressure and pressure transmitters is very robust and durable, with faults occurring fairly rarely. Under normal circumstances, if a sensitive component fails, an individual cannot repair it; instead, the manufacturer should be contacted to replace the entire component. 　　In the use of differential pressure transmitters and pressure transmitters, a common issue is the lack of output; this problem can usually be resolved if the user carries out appropriate adjustments. For the debugging of a pressure transmitter with no output, the general steps are as follows: 1. Check whether the power supply of the differential pressure transmitter is connected reversely, and whether the positive and negative poles of the power supply are connected correctly. 　　2. Check the power supply of the transmitter to determine whether there is 24V DC voltage; it is essential that the voltage supplied to the transmitter be ≥12V (i.e., the voltage at the transmitter’s power input terminal must be ≥12V). If there is no power supply, check whether the circuit is broken, whether the measuring instrument has been selected incorrectly (the input impedance should be ≤250Ω), and so on. 　　3. If the pressure transmitter is equipped with a gauge, it is necessary to check whether the gauge is damaged (the two wires connected to the gauge can be short-circuited first; if everything works properly after short-circuiting, it indicates that the gauge is damaged). If the gauge is indeed damaged, it needs to be replaced. 　　4. If there is a problem with the differential pressure transmitter, a ammeter can be connected in series in the 24V power circuit to check whether the current is normal. If it is normal, it indicates that the transmitter is functioning properly; in this case, check whether other instruments in the circuit are also working correctly. 　　5. Ensure that the power supply is connected to the transmitter’s power input terminal; connect the power cable to the power connection port. 　　The steps for debugging a differential pressure transmitter/pressure transmitter with no output are basically the ones mentioned above. Of course, in practical applications, many problems can arise that prevent differential pressure transmitters from functioning properly. It is recommended that one carefully identify potential faults before installation and use.