Imodzi mwa mitundu yowonjezereka ya masensa otentha pamsika ndi thermistor, yofupikitsidwa "yakugonjetsa mwamphamvu." Amagetsi ali ndi zotchipa zotsika mtengo zomwe zimakhala zolimba komanso zamphamvu. The thermistor ndi yotentha sensor ya kusankha kwa maofesi amene amafuna kwambiri kumva ndi kulondola molondola. Akatswiriwa amakhala ochepa chabe kuntchito zochepa zomwe zimawathandiza kutentha.
Ntchito yomanga
Opaka magetsi ali zipangizo ziwiri zamagulu zopangira zitsulo zamitambo zowonjezera zomwe zilipo mu mitundu yambiri ya phukusi kuti zithandize ntchito zosiyanasiyana. Phukusi lodziwika kwambiri la thermistor ndi kachigawo kakang'ono ka galasi ndi madigiri a 0,5 mpaka 5mm ndi mawaya awiri. Amadzimadzi amapezekanso m'matumba, ma disks, ndi ma pulogalamu yachitsulo. Galasi lamagetsi lamadzi ndi lolimba kwambiri, ndipo njira yowonongeka kwambiri ndiyo kuwonongeka kwa mawaya awiri otsogolera. Komabe, pa mapulogalamu omwe amafunika kuwonjezereka kwapadera, chubu chopangidwa ndi chitsulo chimawoneka kuti amatha kuteteza kwambiri.
Ubwino
Akatswiriwa amakhala ndi ubwino wambiri, kuphatikizapo zolondola, kukhudzidwa, kukhazikika, nthawi yowonongeka, magetsi, ndi mtengo wotsika. Dera loti liwonetsedwe ndi thermistor likhoza kukhala lophweka ngati kukwera-kukana kukana ndi kuyesa magetsi kudutsa thermistor. Komabe, magetsi otentha amatha kutentha kwambiri ndipo nthawi zambiri amatha kuyang'anitsitsa kutentha pang'ono komwe kumapangitsa kuti chiwerengero chawo chikhale cholungama kuwindo laling'onoting'ono pokhapokha ngati njira zowonjezera kapena njira zina zowonjezera zimagwiritsidwa ntchito. Yankho losavomerezeka limapangitsa okwera magetsi kukhala osamala kwambiri kusintha kwa kutentha. Komanso, kukula kwakukulu ndi kutentha kwa mafuta kumapereka kachilombo kakang'ono kamene kamatulutsa mpweya wotentha kuti ayankhe mofulumira kusintha kwa kutentha.
Makhalidwe
Opaka magetsi amapezeka ndi coefficient choipa kapena chosangalatsa (NTC kapena PTC). Kutentha kotentha kumakhala kochepa kwambiri pamene kutentha kumawonjezeka pamene kutentha kwa mafuta ndi kutentha kwabwino kumawonjezereka kukana pamene kutentha kwake kumawonjezeka. Mafakitale a PTC amagwiritsidwa ntchito mndandanda ndi zigawo zikuluzikulu zomwe zimakhala zovuta zowonongeka. Monga zowonongeka, pamene panopa ikuyenderera, magetsi amachititsa kutentha komwe kumapangitsa kusintha kukana. Popeza kuti opaleshoni amafuna kuti magetsi atsopano apange, kutentha kwake kumapangitsa kusintha kusinthika ndi chenicheni chosadziŵika ndi otentha. Kawirikawiri, kudzipangitsa kudziwotcha kumakhala kochepa ndipo malipiro amafunika kokha pamene kulungama kwakukulu kumafunika.
Zochita Zamagetsi
Amagetsi amagwiritsidwa ntchito m'magulu awiri ogwira ntchito kuposa momwe amachitira ndi kutentha. Magetsi-vs-current mode amagwiritsa ntchito thermistor mu kutenthedwa, kutenthetsa chikhalidwe. Njirayi imagwiritsidwa ntchito poyendetsa mamita komwe kusintha kwa kutuluka kwa madzi kumtunda kumapangitsa kuti kusintha kwa mphamvu kuwonongeke ndi thermistor, kukana kwake, ndi zamakono kapena magetsi malinga ndi momwe zimayendetsera. A thermistor ingagwiritsidwenso ntchito panthawi yamakono yomwe thermistor ili pansi pano. Zamakono zidzachititsa kuti thermistor ikhale yozizira, kuwonjezereka kukana ngati zili ndi NTC thermistor ndi kuteteza dera kuchokera kuthamanga kwambiri. Kapenanso pt thermistor pulogalamu yomweyi ingagwiritsidwe ntchito kutetezera kuzinthu zapamwamba zamakono.
Mapulogalamu
Amagetsi ali ndi ntchito zosiyanasiyana, zomwe zimakhala zozizira kwambiri komanso zimakhala zozizira kwambiri. Zizindikiro za NTC ndi PTC thermistors zimabwereketsa ku ntchito monga:
- Zizindikiro za mlingo wamadzi
- kutentha kwa kutentha
- Kuyenda kwayeso
- Chotsani Gages
- Chitetezo cha kutentha
- Kugonjetsa Kupeza Mphamvu
- Maulendo Ochedwa Kutha
- Kutentha kwa Kutentha
Linearization
Chifukwa cha kuyankhidwa kosakhala koyambirira kwa otentha, maulendo owonetsera nthawi zambiri amayenera kupereka molondola molingana ndi kutentha kwakukulu. Yankho losavomerezeka kwa magetsi kumapweya otentha limaperekedwa ndi mgwirizano wa Steinhart-Hart umene umapangitsa kuti munthu asamamve bwino kutentha kwa mpweya. Komabe, chikhalidwe chosakhala mzere chimabweretsa kusamveka molondola pakuchita pokhapokha ngati kutsegulira kwa analog kwa kutembenuka kwa digito kumagwiritsidwa ntchito. Kugwiritsa ntchito njira yosavuta yowonongeka kwa zipangizo zamagetsi zofanana ndi zofanana, zofanana, kapena zofanana ndi zomwe zimatsutsana ndi thermistor zimathandiza kwambiri kugwirizana kwa opangira mafuta ndi kutulutsa mawindo otentha a thermistor pamtengo wotsimikizika. Kukanika kumagwiritsidwa ntchito pa maulendo oyanjanitsa ayenera kusankhidwa kukhala pakati pawindo la kutentha kuti likhale labwino kwambiri.