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常見問題

壓力變送器選型注意事項

文字:[大][中][小] 手機頁面二維碼 2016/8/19     瀏覽次數:    

  在諸類儀表中,變送器的應用最廣泛、最普遍,變送器大體分為壓力變送器 和差壓變送器。變送器常用來測量壓力、差壓、真空、液位等。變送器有兩線制(電流信號)和三線制(電壓信號)之分,兩線制(電流信號)變送器尤多;有智能和非智能之分,智能變送器漸多;有氣動和電動之分,電動變送器居多;另外,按應用場合有本安型和隔爆型之分;在選型時,要根據自己的需求進行相應的選擇。
  一、被測介質兼容性
  在選型時要考慮它的介質對壓力接口及敏感元件,一定要考慮壓力接口及敏感元件材質,否則使用后很短時間就會將外膜片腐蝕壞,被腐蝕壞造成設備和人身事故,所以材質選擇非常重要。
  二、介質溫度和環境溫度對產品的影響
  在選型時要考慮被測介質的溫度和環境溫度,如果溫度高于產品本身溫度補償,容易引起產品測量數據漂移,選擇時一定要考慮變送器的的實際工作環境,避免溫度對壓敏芯體造成測量不準。
  三、壓力量程的選型
  在選型時要考慮設備工作壓力等級,變送器的壓力等級必須與應用場合相符合。
  四、壓力接口的選型
  在選型過程中,嚴格落實用戶所使用壓力接口尺寸,選用合適正確螺紋連接形式,并出產品外形圖確認,或廠家提供樣品也可以;
  五、電氣接口的選型
  在選型時要再三確認用戶信號采集方式及現場布線情況,傳感器信號要與用戶采集接口對接;選用合適正確電氣接口及信號方式的。
  六、壓力類型選型
  測量絕對壓力的儀表稱為絕壓表。對于普通的工業壓力表測量的都是表壓值,也就是絕對壓力與大氣壓的壓差值。當絕對壓力大于大氣壓值時測得的表壓值為正值,稱為正表壓;當絕對壓力小于大氣壓值時測得的表壓值為負值,稱為負表壓,即真空度。測量真空度的儀表稱為真空表。
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