O vlogi oddajnika v industriji in njegovih pomembnih značilnostih

The integrated temperature transmitter is usually used with display instruments, recording instruments, electronic computers, etc., and is generally composed of a temperature probe (thermocouple or thermal resistance) and a two-wire solid electronic unit. The temperature probe is mounted directly in the junction box in the form of a solid module, thus forming an integrated temperature oddajnik . integrirani temperaturni oddajniki so običajno razdeljeni na dve vrsti: Vrsta termičnega upora in Termoelement Type .

The thermocouple temperature transmitter is generally composed of circuit elements such as reference source, cold junction compensation, amplification unit, linearization processing, V/I conversion, reverse connection protection, burn-off processing, and current limiting protection. After the thermoelectric potential generated by the thermocouple is compensated and amplified by the cold junction, the nonlinear error of the thermoelectric potential and the temperature is eliminated by the linear circuit, and finally amplified into a 4-20 mA current output signal. In order to prevent the thermocouple from breaking during the temperature measurement of the thermocouple and causing accidents due to temperature control failure, the transmitter also has a power-off protection circuit. When the thermocouple is broken or the connection is poor, the Oddajnik bo izdal največjo vrednost (28mA), da izklopi moč merilnika .

Oddajnik temperature toplotne odpornosti je na splošno sestavljen iz referenčne enote, linearnega vezja, pretvorbene enote R/V, zaščite za povratno povezavo, zaščite za omejevanje toka, pretvorbene enote V/I in podobno . po temperaturnem merjenju signala se pretvori in ojača s stalnim tokom, nelinearno razmerje med temperaturo in odpornostjo med temperaturo in odpornostjo, ki je kompenziran, nelinearno razmerje med temperaturo in odpornost 4-20 ma, ki je linearna z izmerjeno temperaturo, se izpusti po pretvornem vezju V/I .

Prednosti integriranega temperaturnega oddajnika: shranjevanje svinca, preprosta struktura, močna sposobnost proti interferenca

Izhod integriranega temperaturnega oddajnika je enoten signal 4 do 20 Ma; Uporablja se lahko z mikroračunalniškim sistemom ali drugimi običajnimi instrumenti . Prav tako ga je mogoče narediti v eksplozijsko ali protipožarno merilnim instrumentom .

Drugič, tlačni oddajnik

Tlačni oddajnik se imenuje tudi diferenčni oddajnik, ki je sestavljen predvsem iz glave zaslona, senzorja obremenitve celice, vezja modula in procesne povezave ., ki lahko pretvori prejete tlačne signale plina, tekočine itd. in prilagoditev procesa .

The measurement principle of the pressure transmitter: the process pressure and the reference pressure respectively act on the two ends of the integrated silicon pressure sensitive component, and the differential pressure causes the silicon wafer to be deformed (the displacement is small, only μm level), so that the semiconductor technology on the silicon wafer is used. The resulting fully dynamic Wheatstone bridge outputs an mV-level voltage signal proportional to the pressure driven by an external current source. Due to the excellent strength of the silicon material, the linearity and variation index of the output signal are high. In operation, the pressure transmitter converts the measured physical quantity into a mV-level voltage signal and sends it to a differential amplifier with a high amplification factor that cancels the Temperaturni premik . ojačani signal se pretvori v ustrezen tok signal zaradi napetosti in toka, nato pa nelinearno popravljen, na koncu pa se ustvari standardni napetostni signal, ki linearno ustreza vhodnemu tlaku .

Tlačne oddajnike lahko razdelimo na splošne tlačne oddajnike (0 .} 001MPA ~ 20mp3) in diferencialne tlačne oddajnike (0 ~ 30kpa) glede na tlačno območje.