High static pressure intelligent differential pressure transmitter fault analysis, investigation method, review the fire, smoke, odor, power supply change, lightning strike, moisture, misoperation, and mis-maintenance before the fault occurs. Intuitive method, observe the external damage of the circuit, the leakage of the pressure guiding tube, the overheating of the circuit, the state of the power supply switch, etc. Detection method, open circuit detection, separate the suspected fault part from other parts, check whether the fault disappears, if it disappears, determine the fault, otherwise you can go to the next step, for example, the intelligent differential pressure transmitter can not be normal Hart remote Communication, the power can be disconnected from the body, and the transmitter is powered on by field power supply to check whether the cable is superimposed with electromagnetic signals of about 2 kHz and interfere with communication. Short-circuit detection, in the case of ensuring safety, the relevant part of the loop is directly short-circuited, for example, the output value of the differential transmitter is too small, the pressure-conducting tube can be disconnected, and the differential pressure signal is directly introduced from the outside of the single-pressure valve. Go to both sides of the differential pressure transmitter and observe the transmitter output to determine the plugging and leakage connectivity of the pilot line.
Replace the test, replace the part that is suspected to be faulty, and judge the fault location. For example, if the transmitter board is suspected to be faulty, you can temporarily replace it to determine the cause. Segment detection: The measurement loop is divided into several parts, such as: power supply, signal output, signal transmission, signal detection, sub-section inspection, from simple to complex, from the table and inside, narrow the scope to find the fault location.
High static pressure intelligent differential pressure transmitter installation precautions to prevent the transmitter from coming into contact with corrosive or overheated test media. It is necessary to prevent the dross from depositing in the pressure guiding tube. The pressure guiding tube should be as short as possible. The liquid column heads in the pressure guiding tubes on both sides should be balanced. The pressure guiding tube should be installed where the temperature gradient and temperature fluctuations are small. Prevent crystallization or low temperature icing in the pressure tube. Do not unscrew the exhaust/drain valve all the way to prevent the seal steel ball from falling.
The high static pressure intelligent differential pressure transmitter is small in size and light in weight. Because it has few components, simple structure, and the transformation of differential pressure, displacement, and capacitance signals are connected together, which greatly reduces the volume and reduces the weight. High precision. Since there is no mechanical transmission and friction, and the relative change in capacitance value is large, the accuracy is easily made high. Good reliability. Due to the small number of movable parts, the measuring part is a solid structure of fully enclosed welding, the electronic components undergo strict aging screening, and the special inserts are used, thereby greatly improving the reliability of the transmitter. The range is adjustable and has a positive and negative migration structure. The adjustable range of the range is greater than 6:1, and the external connection of the range zero is adjustable. The overload performance is good. The inside of the sensor adopts a concave arc surface overload protection structure with simple structure and reliable performance. With adjustable damping, it can be used for the measurement of pulsating fluids. The transmitter is used in a dedicated circuit for flameproof and intrinsically safe type, and the circuit has a large output of less than 30 mA. The transmitter can be attached with 100% pointer, LCD liquid crystal, LED digital tube display, and the field reading is very convenient. The transmitter adopts 4~40mA DC standard current signal output, two-wire system, with load and strong anti-interference ability.
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