A common fault analysis of actual case pressure transmitter

Pressure transmitter actual case analysis DCS operating temperature measuring point on the screen into a common cause of white have? （ 1) A safety barrier not sending or defective ( 2) The site a connection or error ( 3) Measured temperature exceeds the range of existing a pressure transducer, which is used to measure the pressure inside the chimney, and how to determine the pressure transmitter is good or bad, how much is the resistance in general, how to do zero point correction. Field the most rough way is: usually see at zero pressure input, whether the output is in: 4 ma, pressure change output follow-up! Instrument internal resistance parameter is used to calculate the voltage drop of equipment to use, internal resistance is different under different pressure. Resistance is the highest limit and many manufacturers ( Conservative parameters) The actual output products, often won't have the moga internal resistance. Conditional or to suppress, measuring the output! Driving in the winter period, technological researchers say there is a differential pressure transmitter indication with actual situation difference is bigger, the craft request processing. Please detail the whole process of the fault processing. （ Should include: communication, interlocking, antifreeze, safe, record and other related content) 1, after detailed communication and technology personnel, confirm the instrument number, confirm the operation condition. Fill out the working ticket, ready to start work. 2, to participate in the instrument of interlocking, before processing, after fill interlocking cast back form to cancel the response of the interlock in the DCS and ESD. 3, check the heating condition to the scene, if be frozen, check the heating pipeline, with a low pressure steam for purging with heat and take pressure tube. Check the frozen reason, if for steam heating pressure not enough or heating, to immediately processed steam heating process. 4, if not be frozen, should check whether root can discharge the liquid in the transmitter, so as to determine whether take pressure tube conduction. If not, should through the drain or purging process. 5 chance, sewage discharge of poisonous and harmful gases, check the heating to prevent burns. 6, processed, heat preservation and the field of the form to all health, and to the attention of the technology staff to strengthen the instrument display, and sign on the work connection order. Pressure transmitter common faults and the serial number and analysis of the failure phenomena, the cause of the problem processing method 1 output of switch is not open to play channel pipe pressure pipe have blocked pipeline dredge the switching pressure tube power supply voltage is too low to 24 v power supply voltage to adjust output if there is a break through to loop the breakpoint power is wrong check power, correct wiring internal connectors if poor contact for processing with a header, the header damage replacement headers to replace electronic device fault circuit board or according to the instrument instructions malfunction 2 large output lead have persistent fluid in the pressure tube, gas discharge pressure tube in the liquid, gas output wires connect the, wrong check processing main, auxiliary lever or test pieces are jam treatment internal connectors poor contact or electronic device failure to replace the new circuit boards according to the instrument instructions to find whether the breakdown pressure sensor damage actual replacement transmitter over pressure transmitter of the selected range to choose the appropriate range of pressure transmitter output 3 small transmitter power supply is normal, if less than 12 VDC, should check whether there is a big load in the circuit, transmitter should be consistent with the input impedance of load RL≤ ( - transmitter power supply voltage 12V) / ( 0. 02A） Ω Output unstable actual pressure is more than 4 pressure transmitter of the selected range to choose the appropriate range of pressure transmitter pressure sensor for damage ( Sometimes serious overload damage isolation diaphragm) Sent back to the manufacturer to repair guide have persistent fluid in the pressure tube, gas discharge tube in the liquid and gas pressure pulsation of measured medium impact damping adjustment to eliminate the power supply voltage is too low or too high to adjust the voltage to 24 v output loop have poor contact or intermittent short circuit connection is loose, the power cord wrong check check processing circuit of multi-point grounding check processing a little internal connectors poor contact pressure sensor to replace damaged transmitter indicator for pressure of 5 incorrect transmitter power supply is normal, if less than 12 VDC, should check whether there is a big load in the circuit, transmitter should be consistent with the input impedance of load RL≤ ( - transmitter power supply voltage 12V) / ( 0. 02A） Ω If pressure value of the reference must be correct if referring to the low accuracy of pressure gauge, it must be another change for high precision pressure gauge pressure range of the indicating meter is consistent with the range of pressure transmitter pressure range of the indicating meter must be consistent with the range of pressure transmitter pressure indicating instrument input and the corresponding wiring is correct pressure indicating instrument input is 4 ~ 20 ma, the transmitter output signal can be directly access; If the pressure indicating instrument input is 1 ~ 5 v must be in the input pressure indicating instrument and a precision in 1 & permil; And above resistance, for 250 & Omega; Resistance, and then connected to the transmitter input transducer, the input impedance should be consistent with the load & le; ( - transmitter power supply voltage 12V) / ( 0. 02A）

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