he tika te whakahaere i te whiu takirere hei whakautu ki te tohu whakauru o te 4~20mA mai i te kaiwhakahaere.E waatea ana te mahi whakaari kotahi (te hokinga mai o te puna) me te mahi takirua. I te mea he kaiwhakarato otinga takirere kotahi-mutu, ka whakaratohia e COVNA nga tuunga hiko hiko ki roto me te mana tohu me te kore mana tohu mo to whiringa.Uiui mai kia whiwhi i te utu pai rawa atu!