原裝霍尼韋爾壓力變送器,honeywell變送器選用方法
金屬電阻應變片又有絲狀應變片和金屬箔狀應變片兩種。
通常是將應變片通過特殊的黏合劑緊密地粘合在產生力學應變基體上，
當基體受力發生應力變化時，電阻應變片也一起產生形變，
使應變片的阻值發生改變，從而使加在電阻上的電壓發生變化。[
壓力變送器有電動式和氣動式兩大類。
電動式的統一輸出信號為0～10mA、4～20mA或1～5V等直流電信號。
氣動式的統一輸出信號為20～100Pa的氣體壓力。
壓力變送器按不同的轉換原理可分為力(力矩)平衡式、電容式、電感式、應變式和頻率式等，
下面簡單介紹幾種壓力(差壓)變送器的原理、結構、使用、檢修和校驗等知識。
壓力變送器的主要作用把壓力信號傳到電子設備，進而在計算機顯示壓力其原理大致是：
將水壓這種壓力的力學信號轉變成電流（4-20mA）這樣的電子信號壓力和電壓或電流大小成線性關系，一般是正比關系。
壓力變送器感受壓力的電器元件一般為電阻應變片，
電阻應變片是一種將被測件上的壓力轉換成為一種電信號的敏感器件。
所以，變送器輸出的電壓或電流隨壓力增大而增大由此得出一個壓力和電壓或電流的關系式壓力變送器的
被測介質的兩種壓力通入高、低兩壓力室，低壓室壓力采用大氣壓或真空，
作用在δ元（即敏感元件）的兩側隔離膜片上，通過隔離片和元件內的填充液傳送到測量膜片兩側。
The measured pressure of the two media into the high and low pressure chamber, low pressure chamber pressure using atmospheric pressure or vacuum,
Acting on both sides of the delta element (ie, the sensing element), through the spacer and the filling fluid in the element to the measuring diaphragm on both sides.
The pressure transmitter consists of measuring the diaphragm and the electrodes on both sides of the insulating sheet to form a capacitor.
When the pressure on both sides of the inconsistency, resulting in displacement of the measurement diaphragm, the displacement and pressure difference is proportional to,
So the capacitance on both sides will not wait, through the oscillation and demodulation .
Pressure transmitter according to different conversion principle can be divided into force (torque) balanced, capacitive, inductive, strain and frequency, etc.,
The following brief deion of several pressure (differential pressure) transmitter principle, structure, use, maintenance and calibration knowledge.
The main role of the pressure transmitter to the pressure signal to the electronic device, and then in the computer display the principle of its pressure is roughly:
The hydraulic pressure of this pressure into the current signal (4-20mA) such electronic signal pressure and voltage or current size of a linear relationship, is generally proportional relationship.
Therefore, the output voltage or current of the transmitter increases with increasing pressure to derive a pressure and voltage or current relationship between the pressure transmitter
原裝霍尼韋爾壓力變送器,honeywell變送器選用方法
