Today’s technical article is the third in a series of articles on determining transmitter faults, which is the third method. We call the third method “circuit method”. Circuit method can be subdivided into two kinds, one is to disconnect the hair, a short-circuit method. Disconnect method: refers to the transmitter suspected fault part of the whole system or unit circuit disconnect, see whether the fault can disappear, so as to determine where the fault method. After the transmitter failure, in the fault range area, the suspected part of the circuit is disconnected to determine the transmitter failure occurs before or after the disconnection. Energized check such as the transmitter fault found to disappear, indicating that the fault is more in the circuit was disconnected, such as the transmitter fault still exists, and then do further disconnect the split check, and gradually rule out the suspicion, narrow the scope of the transmitter fault until the real cause of the fault is found. Disconnect method of unitization, combination, plug-in instrumentation fault checking is particularly convenient, some of the current is too large short-circuit fault is also very effective. However, the overall circuit is a large loop closed system loop or direct coupled circuit structure should not be used. Short-circuit method: the suspected failure of a level of the transmitter circuit or component temporarily shorted to observe the transmitter fault state has changed to determine the fault part of the method. Short-circuit method is used to check the multi-level circuit, a level of circuit or component temporarily shorted, if the fault disappears or significantly reduced, indicating that the fault in the short-circuit point before the fault is unchanged after the short-circuit point. Such as a level of output potential is not normal, the input of the level of short circuit, so that when the output potential is normal, the level of the circuit is normal. Short-circuit method is also commonly used to check whether the components are normal, but also some transmitter inputs can be short-circuited to see the meter indicator changes to determine whether the transmitter is subject to interference. Star Instrument Sensor Manufacturing Co., Ltd. is a collection of research and development, production, sales as one of the high-tech enterprises. Specializing in the production of pressure transmitters, level transmitters, temperature transmitters, temperature and humidity transmitters, differential pressure transmitters, soil moisture transmitters, 3051 transmitters and related instrumentation accessories. Many products under the brand of Star Instruments have obtained a number of patents issued by the state, such as CE certification, IS9001 certification, SGS certification, TüV SüD certification, explosion-proof certification and so on. For product consultation, product customization, agency, technical inquiries, quotations, etc., please contact Star Instruments: 400-600-4496 !