Sultonali Mukaramovich Abduraxmonov

Avtomatlashtirishning texnik vositalari. O’quv qo’llanma


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kollektor.

      Ionizatsion va sig‘imli dachiklarda chiqish signali bosimga logarifimik shkala bo‘yicha bog‘liq. Ya’ni bog‘lanish chiziqli emas. Bu holat o‘lchash tizimida noqulayliklar tug‘diradi.

      Issiqlik manometrlari 10 – 10Pa bosimlarni o‘lchash uchun qo‘llaniladi.

      6.41 – rasm. Issiqlik bosim o‘lchash datchigi sxemasi.

      Bu issiqlik manometrlarida (Rasm 6.41.) R4 qarshilikni volfram materialidan tayorlanadi, 200 C doimiy temperaturagacha tok bilan qizdiriladi. Idishdagi bosimni o‘zgarishi volframni issiqlik uzatishini o‘zgarishiga olib kelib, uni qarshiligini o‘zgartiradi. Bu o‘zgarish qarshiliklar ko‘prigini balansini ko‘rsatib turuvchi mV da aks etadi.

      Biz tashkil etgan texnologik jarayonlarni boshqarish tizimlarida asosan «Sapfir-22M», «Metran – 100» va kichik o‘lchamli mikroprotsessorli «KARAT» bosim datchiklari qo‘llanilgan [4,5]. Ularni chiqish signallari 0 ÷ 5 mA, 4 ÷ 20 mA.

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