HONEYWELL DCS卡件 DKI4247C /MF-75K-380 51304650-100 / MU-TD0D13 DCS 51401491-100 hmi siemens
HONEYWELL DCS卡件 DKI4247C /MF-75K-380 51304650-100 / MU-TD0D13 DCS 51401491-100 hmi siemens
HONEYWELL DCS卡件 DKI4247C /MF-75K-380 51304650-100 / MU-TD0D13 DCS 51401491-100 hmi siemens
傳感器輸出有很多形式,但是大多是電流輸出和電壓輸出,有些客戶在選擇傳感器的時(shí)候不知道應(yīng)該選擇電路輸出還是電壓輸出,下面我們就來說說這兩種輸出的區(qū)別,下面我們以壓力傳感器為例進(jìn)行說明。
壓力傳感器是應(yīng)用zui多的一款傳感器之一,電流輸出和電壓輸出的壓力傳感器都非常常見,這兩種輸出主要有下面幾個(gè)區(qū)別,首先,早期的變送器大多為電壓輸出型,即將測量信號(hào)轉(zhuǎn)換為0-5V電壓輸出,這是運(yùn)放直接輸出,信號(hào)功率<0.05W,通過模擬/數(shù)字轉(zhuǎn)換電路轉(zhuǎn)換數(shù)字信號(hào)供單片機(jī)讀取、控制。其次,在信號(hào)需要遠(yuǎn)距離傳輸或使用環(huán)境中電網(wǎng)干擾較大的場合,電壓輸出型傳感器的使用受到了*限制,暴露了抗*力較差,線路損耗破壞了精度等等等缺點(diǎn),而兩線制電流輸出型變送器以其具有*的抗*力得到了廣泛應(yīng)用。zui后,電壓輸出型變送器抗*力極差,線路損耗的破壞,談不上精度有多高,有時(shí)輸出的直流電壓上還疊加有交流成分,使單片機(jī)產(chǎn)生誤判斷,控制出現(xiàn)錯(cuò)誤,嚴(yán)重時(shí)還會(huì)損壞設(shè)備,輸出0-5V不能遠(yuǎn)傳,遠(yuǎn)傳后線路壓降大,精確度大打折扣。
電流輸出、電壓輸出的傳感器都是非常常見的,但是就目前發(fā)展趨勢來看,電壓輸出正在逐漸淘汰,現(xiàn)在數(shù)字輸出的傳感器也正在被客戶接收,數(shù)字輸出的傳感器信號(hào)容易處理,便于集成,未來更多的傳感器將會(huì)選擇數(shù)字輸出的。
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