Mukuita kwekutarisa kumanikidzwa kwakasiyana-siyana, tinogona kuona kuti dzimwe nguva kubuda kwetransmitter yekumanikidza kwakasiyana-siyana kunofanirwa kugadziriswa kuita signal ye square root 4~20mA. Mashandisirwo akadaro anowanzo itika muindasitiri yekuyera kuyerera kwemvura uchishandisa musimboti wekumanikidza kwakasiyana-siyana iyo iri imwe yenzira dzakakurumbira dzekutarisa kuyerera kwemvura. Mushure mekunge kuyerwa kwekuyerera kweDP kwaongororwa muchidimbu, tinogona kunzwisisa basa retransmitter yekumanikidza kwakasiyana-siyana mukubatsira mashandiro eflowmeter.
Ma flow metres anoshanda basa rakakosha mukutarisa mwero wemvura pakati pema "process" akaomarara ema "industrial pombi" nekupa kuverenga kwemvura panguva chaiyo uye nemabhesi akakodzera izvo zvinobatsira mukutarisira zvinhu zvinobudirira uye kuchengetedzeka kwekushanda. Nzira yekusiyanisa kumanikidzwa ndeimwe yematekinoroji makuru ekuyera kuyerera kwemvura anosanganisira mhando dze flowmeters. Dzakasiyana muchimiro asi dzine zvinangwa zvakafanana zvekushanda kuti dzigadzire musiyano we pressure pakuverenga kuyerera kwemvura zvichibva panheyo huru yeEquation yaBernoulli: Simba rose rine simba rekinetic uye rinokwanisa kuyerera mumvura rinoramba riripo pasinei nemamiriro ezvinhu. Saka chinhu chikuru chema DP flowmeters ichinhu chinodhonza mvura (orifice plate, venturi tube, pitot tube, v-cone, nezvimwewo) chinoita kuti mvura imhanye munzvimbo yemuno, zvichikonzera kudzikira kwekumanikidzwa kwemvura.
Apa ndipo panoshanda transmitter yekumanikidza yakasiyana. Zvinhu zvikuru zvinongova zvishandiso zvemakanika, zvinogadzira musiyano wekumanikidza mukuita asi hapana chimwe chazvo chinokwanisa kuyera zvakananga kukosha uye chiratidzo chekubuda. Saka vanoda mubatsiri kuti vaone kumanikidzwa kwakasiyana pakati pekumusoro nekudzika kwerwizi uye pakupedzisira vochishandura kuita chiratidzo chekubuda chekuyera kukosha kwekuyerera kwemvura —— zvinonzwika sebasa rakakodzera transmitter yekumanikidza yakasiyana.
Mushure mekunge kuyerwa kweDP kwasimbiswa, mubvunzo uchava wekuti, kumanikidzwa kwakasiyana uye mwero wekuyerera kwemvura zvinogona sei kuenderana? Zvichibva paEquation neContinuity Equation yaBernoulli, pane hukama husina kurongeka huripo pakati pekuwedzera kwekumanikidzwa (ΔP) uye mwero wekuyerera kwemvura chaiyo (Q):
Q=K√ΔP
Apo K inomiririra chiyero chemita chaiyo chinosarudzwa nezvinhu zvakaita serudzi rwechinhu chikuru nezvimwe zvinhu zvakawanda (huwandu hwemvura, saizi yepombi nezvimwewo). Chiratidzo cheTransmitter che4~20mA hachina kurongeka uye hachikwanise kuratidza mafambiro acho nemazvo. Dambudziko iri rinogona kugadziriswa nekubatanidza square root extraction (SRE) iyo inobvisa square root muchimiro cheΔP, zvichiita kuti chiratidzo chienderane nevolumetric flow rate pakupedzisira.
Kana transmitter isingakwanise kuita SRE mukati, kuverenga kunofanirwa kuitwa necomputer yekuyerera kwekunze kana system yekudzora iyo inogona kuwedzera kuomarara uye zvikanganiso zvinogona kuitika mukutumira masaini. Saka maDP transmitters emazuva ano anowanzova nebasa reSRE rechiratidzo rakavakirwa mukati pa analog circuit uye anogona kuburitsa 4~20mA ine mativi mana. Uyezve, maDP transmitters anogona kushandisa low flow cut-off kuderedza sensor drift iyo inogona kukwidziridzwa zvakanyanya pakuyerera kwakaderera. Basa iri resoftware rinomanikidza kubuda kwesimba kusvika ku4 mA (0% flow) kana kuyerera kwakaverengerwa kuchidonha pasi pemuganho wakatsanangurwa kudzivirira chiratidzo chisina kujeka uye kuunganidzwa kwemafambiro enhema.
Masisitimu ekuyera kuyerera kwemhepo akasiyana ndeimwe yematekinoroji ekutonga kuyerera kwemhepo anozivikanwa uye anozivikanwa. Kunyange zvazvo achipa mabhenefiti akanaka, kunewo zvipingamupinyi nekuda kwemaumbirwo nepfungwa:
+ Dhizaini yakajairika, tekinoroji yakasimbiswa
+ Chimiro chakasimba uye chakasimba, hapana zvikamu zvinofamba
+ Kururama kwakagadziridzwa uye kugadzikana
- Kurasikirwa nedzvinyiriro zvachose
- Chiyero che "turndown" chakamanikana
- Inonzwa shanduko muhuwandu hwemvura nezvimwe zvinhu
Kusarudza flowmeter yakakodzera kwakakosha kuti kuyerwa kwemvura kushande zvakanaka uye kuve kwakarurama. Nekufunga zvizere nezvemashandisirwo ayo, vashandisi vanogona kuita sarudzo dzakakodzera dzinoenderana nezvinodiwa chaizvo.Shanghai Wangyuananga achiita basa rekugadzira nekugadza zvishandiso zvekuyera nekudzora kweanopfuura makore makumi maviri kusanganisira marudzi ese emaflowmeter, ma differential pressure transmitters nezvimwe zvinhu zvekuyera flow. Kana muine mimwe mibvunzo kana zvinodiwa, ndapota musazeza kutibata.
Nguva yekutumira: Nyamavhuvhu-25-2025