The two pressures of the measured pressure medium of the intelligent pressure transmitter pass into the high and low pressure chambers, acting on the isolating diaphragms on both sides of the delta component (ie, the sensitive component), and transmitting to the spacer through the spacer and the filling liquid in the component. Measuring the two pressures of the measured pressure medium on both sides of the diaphragm into the high and low pressure chambers, acting on the isolating diaphragm on both sides of the δ component (ie the sensitive component), passing through the spacer and the component The fill fluid is transferred to both sides of the measuring diaphragm. The intelligent pressure transmitter consists of a capacitor consisting of a measuring diaphragm and electrodes on the insulating sheets on both sides. When the pressures on both sides are inconsistent, the measurement diaphragm is displaced, and the displacement is proportional to the pressure difference, so the capacitance on both sides is not equal, and is converted into a signal proportional to the pressure through the oscillation and demodulation links.
The working principle of the intelligent pressure transmitter and the absolute pressure transmitter is the same as that of the differential pressure transmitter. The difference is that the pressure in the low pressure chamber is atmospheric pressure or vacuum, and the A/D converter of the intelligent pressure transmitter will be the demodulator. The current is converted to a digital signal whose value is used by the microprocessor to determine the input pressure value and the microprocessor controls the operation of the transmitter.
In addition, it performs sensor linearization, resets measurement range, engineering unit conversion, damping, square root, sensor trimming, and diagnostics and digital communication.
Most of the failures at the construction site are caused by improper use and installation methods. There are several aspects summarized.
1. The primary component (orifice plate, remote transmission measuring connector, etc.) is blocked or installed in the wrong form, and the pressure point is unreasonable.
2. Leakage or blockage of the pressure guiding tube, residual gas in the liquid filling tube or residual liquid in the inflation tube, deposits in the process flange of the transmitter, forming a dead zone.
3. The transmitter wiring is incorrect. The power supply voltage is too high or too low. The contact between the meter head and the meter terminal is poor.
4. It is not installed in strict accordance with technical requirements. The installation method and on-site environment do not meet the technical requirements.
The above faults will cause the transmitter output to be abnormal or the measurement is not accurate, but after careful inspection, strictly use and install according to the technical requirements, take effective measures in time, the problems can be eliminated, and the faults that cannot be handled should be notified in time. Extension technology to check, consult the phone.
Dingtuo pressure transmitter special website: http://
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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