Choose temperature to change send implement change with pressure send implement methodological comparison

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  • source:SHNMIN CNC Machining
One, unifinication temperature changes send implement general by measure lukewarm probe (thermocouple or thermal resistance sensor) make solid electron unit comprise with two lines. Use solid module form to will measure lukewarm probe to be installed directly inside wiring box, form unifinication thereby change send implement. Unifinication temperature changes send implement general component is mixed for thermal resistance thermocouple two sort. Thermal resistance temperature changes send implement be change unit, linear circuit by standard unit, R/v, receive protection, current limliting protection, V/i to change the composition such as unit instead. After measuring tepid resistor signal to change enlarge, be opposite by linear circuit again of temperature and resistor nonlinear the relation undertakes compensating, the constant current signal of the 4 ～ 20ma that one outputs to become linear concern with the temperature that be measured after classics V/i change-over circuit. Thermocouple temperature changes send implement handle by unit of compensation of fiducial source, Leng Duan, enlarge, linearization commonly, V/i changeover, break handle occasionally, receive protection, current limliting protection to wait for circuit unit to comprise instead. It is the pyroelectricity situation classics that produces thermocouple after Leng Duan compensates enlarge, again what the cap eliminates pyroelectricity situation and temperature by linear circuit is nonlinear error, magnify changeover is electric current of 4 ～ 20ma to output signal finally. In be being measured to prevent thermocouple, make as a result of couple fracture of wire accuse lukewarm invalidation to cause an accident, change send implement in still set cut off the power protective circuit. When thermocouple fracture of wire or receive when solution is undesirable, change send implement can output maximum (28ma) in order to make appearance dump. Unifinication temperature changes send appliance to have a structure signal of simple, economic down-lead, output ability of big, interference rejection is strong, linear good, indication appearance module of simple, solid is aseismatic and moistureproof, have receive protection and current limliting instead protection, job is reliable wait for an advantage. Unifinication temperature changes send implement output is signal of unified 4 ～ 20ma; Can match with personal computer system or other convention appearance use. Usable also an explosion proof of requirement make it or fire prevention measuring instrument is expressed. 2, pressure changes send implement also say difference changes send implement, main by measure press head of circuit of component sensor, module, indication watch, watchcase and process join wait for composition. It can become the pressure signal change such as reception gas, liquid voltaic voltage signal of the standard, with furnishing the directive calls the police 2 appearance such as appearance, recorder, adjuster undertake metrical, directive and process adjust. Pressure changes send implement measuring a principle is: Flow pressure and referenced pressure part the action two end at sensing element of compositive silicon pressure, its difference is pressed make silicon chip is out of shape (displacement is very small, only μ M class) , the bridge of completely dynamic Hui Sideng that becomes in order to make with semiconductor the technology is made on silicon chip outputs direct ratio below drive of outer ministry current source the signal of Mv class voltage at pressure. Because the strong sex of silicon material is admirable, the degree of linearity that outputs signal so and become poor index all very tall. When the job, pressure changes send implement the voltage signal that changes the physical quantity that be measured into Mv class, send toward enlarge multiple very tall and the differential type amplifier of drift of OK and mutual quits temperature. The electric current of signal classics voltage after enlarge changes commutation to become corresponding voltaic signal, repass is nonlinear corrective, the signal of voltage of standard electric current that final generation and correspondence of sex of input pressure thread concern. CNC Milling CNC Machining