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二氧化碳濃度控制

更新時(shí)間:2011-11-30      點(diǎn)擊次數:1656

    1.兩種控制系統:
    紅外傳感器(IR)或熱導傳感器(TCD)進(jìn)行測量。兩種傳感器都是準確的,但都各有優(yōu)缺點(diǎn)。熱導傳感器監控CO2濃度的工作原理是基于對內腔空氣熱導率的連續測量,輸入CO2氣體的低熱導率會(huì )使腔內空氣的熱導率發(fā)生變化,這樣就會(huì )產(chǎn)生一個(gè)與CO2濃度直接成正比的電信號。紅外傳感器(IR)它是通過(guò)一個(gè)光學(xué)傳感器來(lái)檢測CO2水平的。IR系統包括一個(gè)紅外發(fā)射器和一個(gè)傳感器,當箱體內的CO2吸收了發(fā)射器發(fā)射的部分紅外線(xiàn)之后,傳感器就可以檢測出紅外線(xiàn)的減少量,而被吸收紅外線(xiàn)的量正好對應于箱體內CO2的水平,從而可以得出箱體內CO2的濃度。由于IR系統是通過(guò)紅外線(xiàn)減少來(lái)確定箱內CO2濃度,而箱體內顆粒物能夠反射或部分吸收紅外線(xiàn),使得IR系統對箱體內顆粒物的多少比較敏感,因此IR傳感器應用在含HEPA空氣過(guò)濾器的培養箱內比較合適,如HealForce(力康)HF160W水套式培養箱就是采用的HEPA過(guò)濾器配合高精度IR傳感器的配置;而HF90氣套式培養箱采用的是高精度TCD傳感器。 
    
    2.CO2濃度均一性:此點(diǎn)與溫度均一性的要求類(lèi)似,在此就不做贅述。

   3.CO2測量系統自動(dòng)校準功能:
    無(wú)論哪種CO2測量系統在使用一段時(shí)間后都會(huì )產(chǎn)生漂移,而產(chǎn)生漂移后直接會(huì )導致箱體內二氧化碳濃度不能穩定在我們的設定值,致使培養失敗,所以我們在這里強烈建議用戶(hù)在選購培養箱時(shí)必須要選擇帶有CO2測量系統自動(dòng)校準功能的培養箱。 
    目前市面上擁有此功能的二氧化碳培養箱極少,而HealForce(力康)牌HF90氣套式二氧化碳培養箱能夠做到。HF90先進(jìn)的“AUTO-START”自動(dòng)啟動(dòng)功能可以將培養箱自動(dòng)調節到您所設定的各項工作參數,并使CO2濃度處于zui和穩定狀態(tài),保證CO2濃度不產(chǎn)生正負漂移。

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