Pressure detects with change send

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One, overview pressure is one of important parameter in industrial production, move to assure to produce a political party, must undertake monitor and be controllinged to pressure, but those who need a specification is, the pressure that says here, it is the intensity of pressure in physical concept actually, namely perpendicular action is in the force on unit area. Measure in pressure in, the cent that commonly used and absolutely pressure, meter pressure, negative pressure or vacuum spend. Alleged and absolutely pressure is the overall pressure that points to action of the medium that be measured to go up in container unit area, express with symbolic Pj. Call absolutely pressure list with the appearance that will measure absolutely pressure. The average pressure that place of ground air column generates calls atmosphere force, express with symbolic Pq. Make barometer with the appearance that will measure atmosphere to enrage pressure. Absolutely pressure presses the difference of force with atmosphere. Call meter pressure, express with symbolic Pb. Namely Pb=pj-pq. When absolutely pressure the value is less than atmosphere force when the value, meter pressure is worth to lose (lose pressure namely) , this loses the absolute value that pressure is worth, call vacuum to spend, express with symbolic Pz. Call vacuum meter with the appearance that will measure vacuum to spend. The meter that can measure pressure value to be able to measure vacuum to spend again already calls pressure vacuum meter. 2, the measurement of pressure and manometric choice pressure measure a principle to be able to divide He Zhenpin of the pillar that it is fluid, stretch type, resistor type, capacitance type, inductance type type is waited a moment. Manometric it is broad and OK to measure pressure range from exceed vacuum to be like 133 × 10-13Pa till extrahigh voltage 280MPa. Manometric can divide from the structure for the lab model apply with industry model. Manometric breed is various. Because this basis is measured,pressure object is chosen well manometric appear very important. 1. Directive of pressure of on the spot is in when pressure 2.

When 6Kpa, can use watch of diaphragm type pressure, ripple to be in charge of pressure watch and wave to publish tubal pressure list. When detecting like the low pressure that is close to atmosphere, pressure of usable diaphragm type is expressed or moire pressure tubal form is expressed. 2. Remote if need to undertake,pressure shows remote when pressure shows, use pneumatic or dynamoelectric pressure transformer commonly, also can use electric pressure sensor. When pressure limits is 140~280MPa, should use high-pressured pressure to pass receptor. Can use pyroelectricity vacuum gauge when high vacuum is measured. 3. Many bits of pressure is measured when undertaking pressure is measured many a little bit, can use itinerate pressure detector. If be measured what pressure achieves limiting value to need to call the police, what should choose accessary warning decice is of all kinds manometric. Right choice is manometric outside dividing afore-mentioned a few consideration, still need to consider the following. (1) the choice basis of span is measured the size of pressure decides appearance span. To watch of stretch type pressure, when measuring stable pressure, value of the greatest pressure should not exceed the 3/4 of full span; When measuring fluctuant pressure, value of the greatest pressure should not exceed the 2/3 of full span. Lowest measures pressure value to answer not the 1/3 under full span. (2) what precision chooses to allow according to production is the biggest measure an error, determine the precision level of appearance with economy, substantial principle. General industrial pressure is expressed 1.

5 class or 2.

5 level are adequate already, scientific research or nicety are measured with 0.

5 class or 0.

The nicety of 35 class manometric or standard pressure watch. (3) the consideration ambient conditions of use environment and medium function is harsh, , like high temperature, corrode, damp, vibration, the function of the medium that be measured, if explode the discretion of temperature, caustic, easy crystallization, combustibly, easily,wait a moment, will determine the sort that pressure expresses and type with this. (4) the chooses directive of spot on the spot pressure that pressure expresses over all dimension expresses general surface diameter to be φ 100mm, in the standard taller or illume condition closes poor circumstance to be 250mm of φ 200~ φ with exterior diameter, dish diameter of outfit pressure watch is φ 150mm, or express with rectangular pressure. Pressure of commonly used and stretch type expresses norms to see watch 2-1-13. 3, pressure sensor pressure sensor is the main component in pressure testing system, will be measured by all sorts of pressure sensing element the telegraphic name that signal changes pressure to be measured easily makes output, show to indication appearance pressure is worth, or use for control and calling the police. 1. The metabolic changeover that pressure sensor of type of meet an emergency of pressure sensor of type of meet an emergency is a pressure undertakes metrical into the change of resistance, meet an emergency piece it is the resistor system that makes by metallic conductor or semiconductor, its block is worth along with the strain that pressure place produces change. 2. Pressing electric type pressure sensor to press the principle of electric type sensor is the piezoelectric effect that is based on certain crystal material, the data suppressing report that uses extensively at present has quartz and titanium acerbity barium to wait, happen when effect of these strength of crystal press press when machinery is out of shape, opposite sex charge generates on two its opposite side, this kind of phenomenon is called " piezoelectric effect " . 3.

Pressure sensor of optical fiber of optical fiber pressure sensor and photograph of traditional pressure sensor are compared, is there distinctive advantage: ? ? of bank of π of buy of beautiful of  of ù of  mildew Liao does not suffer electromagnetism interference, electric insulation is good, anti-corrosive, without electric spark, can be in high pressure, combustible pressure, discharge, fluid is measured in the environment that explodes easily etc. Its delicacy height, volume is minor, pliability is good, the space that can insert stricture is to undertake metrical, get because of this attention, and get rapid development. 4, pressure changes send implement the appearance that needs to controlling indoor indication pressure, choose pressure to change commonly send implement or pressure sensor, to hazardous area, often choose pneumatic pressure to change send implement, explosion proof dynamoelectric Ⅱ or Ⅲ pressure changes send implement; To the measurement of small pressure, can use profound difference to press change send implement; To be being blocked up ropily, easily, easy crystallization and corrode strong medium, appropriate chooses the diaphragm type pressure that takes flange to change send implement; Reach in place of atmospheric corrosion t strong caustic in waiting for dielectric measurement, still can choose 1151 series or 820 series pressure to change send implement. Pressure changes send implement the measures those who press generation of sensing element place to measure power volume range that measures a part is 50~100 about, highest do not exceed 150N. According to this one requirement, the choice basis of sensing element is in charge of by the ripple that makes, its structure principle is shown like graph 2-1-12. Enter when P of the pressure that be measured measure room hind, measure power via measuring moire canal to be changed, use in through push rod advocate on lever, deliver pneumatic to change a part. Measure medium, maximum pressure 2.

5~10MPa, 10~60MPa) the Bao Duan that sensing element uses chromic vanadium steeliness to become commonly is in charge of, its measurement the principle is the radial component of force that uses Bao Duan to be in charge of extreme to arise, through push rod 2 action are in advocate lever the lower end of 3, drive change send implement movements of pneumatic changeover share. CNC Milling CNC Machining