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???? ???? ?????? ?? ???? ????? ?????? ??????? ????? ?????? ????? ?????? ?????? ?????? ???? ?? 10 ????? ?? ?????? ?? ??? ??????.

??? ?? ??? ???? ????? ????? 4-20 ???? ????? ?????? ????? ????? ???? ??????? ?????????

??? ?? ??? ???? ????? ????? 4-20 ???? ????? ?????? ????? ????? ???? ??????? ???????? ?

?? ??????? ???????? ??? ???? ??????????? ????? ???????? ????? ????? ??? ?????? ?? ??????? ??????? ???????? ??? ?????? ???????. ??????? ????? ?????? ?? ??????? ??? ????????? ?? ????? ???? ???????? ??? ???? ???? ???? ???????? ?? ??????? ???????? ?? ????? ????????? ??????? ??????? ????? ????? ???? ??????? ???????? ?? ????? ????????.

???? ????? ???? ??????? ???????? ?? ???? ????? ???? ??????? ???????? ??? ?????? ???????? ???? ?????? ?????????. ????? ??? ??? ??????? ???? ????? ??????? ?????????? ??? ?????? ????????? ??? ???? ???????. ???????? ?? ??????? ??? ???? ???? ???? ??????? ?????? ??? 4 ?20 ???? ????? ???? ???????? ?????????.

????? ?????? ???? 4-20 ???? ??????

??????? ?????? ????????? ???? ????? ???????? ???????? ???????? ?? ??????? ??????? ??????? ??????? ??? ??????? ?? ??????? ?? ???? ??? ????? ?????? ??? ??????? ????? ??????? ??? ??? ????? ????? ????. ???? ?????? ?????? ?? 20 ???? ????? ?????? ????? ??????? ????????: ??????? ???????? ??????? ?? ????? ?????? ???? 20 ???? ????? ??? ????? ?????? ?????. ??? ???? ??????? ??? ????? ??? 0 ???? ????? ????? ?????? ??? ??? ?????? ??????? ?? ?? ??? ?? 4 ???? ????? ????? ??????? ??????. ??? ?????? ?? ????? ???? ???? ????? ?????? ??????? ??? 0. ?????? ?? ??????? 2 ???? ????? ????? ????? ??????? ??????. ???? ????? ????. ??? ??????? ?? ???? ???????? ???? ??? ?? ?? 4-20 ???? ????? ?????? ???? ?????? ?? ?? ??????? ??? ??? ??????? ???? ?????? ?? ??? ?????? ?4 ???? ????? ?????? ???? ??????? ?????? ??????? ????? ??????? ????????.

??? ?? ??? ???? ????? ????? ?????? 4-20 ???? ????? ????? ????? ???? ??????? ?????????

????? ???????:

① ????? ?????? ??? ????????

② ????? ????? ????? ?????? ???? ??????? ??????? ?? ????? ????????

③ ????? ????? ?????? ??? ????? ???????? ?? ??? ???? ?????? ???? ??????. ????? ????? ?????

④ ????? ??? ???? ?????? ?????. ??? ???? ??? ??????? ?????? ????????? ???? ???? ????? ??????? ??????? ?????? ?????? 4-20 ???? ?????.

??? ?????? Uo ?? ??? ??????? ????? ???????? ???? ?????? ?? ?? Uo≥Umin ??? ????? ?????? (?????? Iu003d20mA).

??: ????? ???? ??????? ???? ???? ???? ?????? ????? ????? ???? ???? ??????? ??? ???? ??? ?????. ????????:

????????: U<sub>eu003d24V</sub>? I<sub>u003d20mA</sub>? RL<sub>u003d250Ω</sub>? U<sub>minu003d12V</sub>. ???? ?????? ?????? ?? r ????? 175Ω.

????? ????? ???? ?????? ???????? ?? ?????:

ρ——???????? ??????? (?????? ?????? 0.017? ?????? ?????????? 0.029)

L——??? ???? (??????: ???)

S——???? ???? (??????: ?????? ????)

??????: ?????? ???? ???????? ?????? ?? ??? ????? ??????? ?? ????? ????? ??????. ????? ??? ??? ?????? ???? ???????? ????? ??? ????? ??? ???????.

????? ????? ??????? ?????? ??????? ρu003d = 0.017 Ω·mm?/m? ?? ?? ?????? ??? ????? ?????? ???? ???? u200bu200b1mm? ???? 1 ??? ?? 0.017Ω. ????????? ??? ??? ????? ???? ???? ??????? 175Ω ???????? ?????? ???? ???? 1 ??? ?? 175/0.017u003d10294 (?).

????? ?? ??????? ???????? ???? ?? ??? ????? ??????? 4-20 ???? ????? ??? ????? ?????? ?? ??????? (???????? ??? ????? ??? ???? ??????? ???????? ????? ??? ????? ????? ???????).

??? ????? ?? ???? ????? ??? ?????? ??????? ?????? ??????? ??????? ??????

??? ?? ???? ?? ??????? GB/T 3369.2-2008 "???????? ????????? ?????? ?????? ?? ???????? - ????? 2: ?????? ??? ?????? ???????": "??? ??? ?????? ???? ?????? ??????? ????????? ??????? ?? ??????? GB/T 3369.1-2008? ?? ????? ??????? ????? ??? ?????? ??????? ????????? ??????? ?? ??? ????? ??????? ??????? ?????". ?????? ??????? ?? ?? ????? ????? ????? ??? ??????? ??????? ?????? ??? ???? ???? ???????.


??? ??? ???? ?? ????? ????? ????? ??????? ????????? ??????? ??????? ???????? ??? ????? ?????? ?????? ???????? ???? ?????????? ?? ?????? ??????.

???? ??? Rika Sensors ?????? ??? ???? ????? ?? ??? ???? ???????? ?? ???????.

?????? ?????? ?? ????? ???? ?????????? ????? ???????? ??????? ??????? (OEM).

???? ?? ?????? ????? ?? ??????? ?????? ?????? ?????? ???????? ??? ??? ?????? ?????? ??????? ?????? ????????.

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