140CPU65260，140CPU65260

140CPU65260

 

140CPU65260
公式如下：
 
C=K-0K-1K-2K-3（Wmax+W）/N
 
C—單個傳感器的額定量程
 
W—秤體自重
 
Wmax—被稱物體凈重的大值
 
N—秤體所采用支撐點的數量
 
K-0—保險系數，一般取值在1.2～1.3之間
 
K-1—沖擊系數
 
K-2—秤體的重心偏移系數
 
K-3—風壓系數
 
根據經驗，一般應使傳感器工作在其30%～70%量程內，但對于一些在使用過程中存在較大沖擊力的衡器，如動態軌道衡、動態汽車衡、鋼材秤等，在選用傳感器時，一般要擴大其量程，使傳感器工作在其量程的20%～30%之內，使傳感器的稱量儲備量增大，以保證傳感器的使用安全和壽命。
 
要考慮各種類型傳感器的適用范圍：
 
傳感器的準確度等級包括傳感器的非線形、蠕變、蠕變恢復、滯后、重復性、靈敏度等技術指標。在選用傳感器的時候，不要單純追求高等級的傳感器，而既要考慮滿足電子秤的準確度要求，又要考慮其成本。
 
對傳感器等級的選擇必須滿足下列兩個條件：
 
1、滿足儀表輸入的要求。稱重顯示儀表是對傳感器的輸出信號經過放大、A/D轉換等處理之后顯示稱量結果的。因此，傳感器的輸出信號必須大于或等于儀表要求的輸入信號大小，即將傳感器的輸出靈敏度代人傳感器和儀表的匹配公式，計算結果須大于或等于儀表要求的輸入靈敏度。
 
2、滿足整臺電子秤準確度的要求。一臺電子秤主要是由秤體、傳感器、儀表三部分組成，在對傳感器準確度選擇的時候，應使傳感器的準確度略高于理論計算值，因為理論往往受到客觀條件的限制，如秤體的強度差一點，儀表的性能不是很好、秤的工作環境比較惡劣等因素都直接影響到秤的準確度要求，因此要從各方面提高要求，又要考慮經濟效益，確保達到目的。
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