140CPU65260，140CPU65260

140CPU65260

 

140CPU65260
公式如下：
 
C=K-0K-1K-2K-3（Wmax+W）/N
 
C—單個(gè)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(diǎn)的數(shù)量
 
K-0—保險(xiǎn)系數(shù)，一般取值在1.2～1.3之間
 
K-1—沖擊系數(shù)
 
K-2—秤體的重心偏移系數(shù)
 
K-3—風(fēng)壓系數(shù)
 
根據(jù)經(jīng)驗(yàn)，一般應(yīng)使傳感器工作在其30%～70%量程內(nèi)，但對(duì)于一些在使用過(guò)程中存在較大沖擊力的衡器，如動(dòng)態(tài)軌道衡、動(dòng)態(tài)汽車衡、鋼材秤等，在選用傳感器時(shí)，一般要擴(kuò)大其量程，使傳感器工作在其量程的20%～30%之內(nèi)，使傳感器的稱量?jī)?chǔ)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(zhǔn)確度等級(jí)包括傳感器的非線形、蠕變、蠕變恢復(fù)、滯后、重復(fù)性、靈敏度等技術(shù)指標(biāo)。在選用傳感器的時(shí)候，不要單純追求高等級(jí)的傳感器，而既要考慮滿足電子秤的準(zhǔn)確度要求，又要考慮其成本。
 
對(duì)傳感器等級(jí)的選擇必須滿足下列兩個(gè)條件：
 
1、滿足儀表輸入的要求。稱重顯示儀表是對(duì)傳感器的輸出信號(hào)經(jīng)過(guò)放大、A/D轉(zhuǎn)換等處理之后顯示稱量結(jié)果的。因此，傳感器的輸出信號(hào)必須大于或等于儀表要求的輸入信號(hào)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(jì)算結(jié)果須大于或等于儀表要求的輸入靈敏度。
 
2、滿足整臺(tái)電子秤準(zhǔn)確度的要求。一臺(tái)電子秤主要是由秤體、傳感器、儀表三部分組成，在對(duì)傳感器準(zhǔn)確度選擇的時(shí)候，應(yīng)使傳感器的準(zhǔn)確度略高于理論計(jì)算值，因?yàn)槔碚撏艿娇陀^條件的限制，如秤體的強(qiáng)度差一點(diǎn)，儀表的性能不是很好、秤的工作環(huán)境比較惡劣等因素都直接影響到秤的準(zhǔn)確度要求，因此要從各方面提高要求，又要考慮經(jīng)濟(jì)效益，確保達(dá)到目的。
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