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①注意經(jīng)常性的校準(zhǔn)和檢測(cè)

(1) attention to regular calibration and detection

有毒有害氣體檢測(cè)儀也同其它的分析檢測(cè)儀器一樣 ,都是用相對(duì)比較的方法進(jìn)行測(cè)定的 :先用一個(gè)零氣體和一個(gè)標(biāo)準(zhǔn)濃度的氣體對(duì)儀器進(jìn)行標(biāo)定 ,得到標(biāo)準(zhǔn)曲線儲(chǔ)存于儀器之中 ,測(cè)定時(shí) ,儀器將待測(cè)氣體濃度產(chǎn)生的電信號(hào)同標(biāo)準(zhǔn)濃度的電信號(hào)進(jìn)行比較 ,計(jì)算得到準(zhǔn)確的氣體濃度值。因此 ,隨時(shí)對(duì)儀器進(jìn)行校零 ,經(jīng)常性對(duì)儀器進(jìn)行校準(zhǔn)都是保證儀器測(cè)量準(zhǔn)確的必不可少的工作。需要說明的是 :目前很多氣體檢測(cè)儀都是可以更換檢測(cè)傳感器的 ,但是 ,這并不意味著一個(gè)檢測(cè)儀可以隨時(shí)配用不同的檢測(cè)儀探頭。不論何時(shí) ,在更換探頭時(shí)除了需要一定的傳感器活化時(shí)間外 ,還必須對(duì)儀器進(jìn)行重新校準(zhǔn)。另外 ,建議在各類儀器使用之前 ,對(duì)儀器用標(biāo)氣進(jìn)行響應(yīng)檢測(cè) ,以保證儀器準(zhǔn)確有效。

Toxic and harmful gas detector with other analytical instruments, are determined by the comparative method: after the instrument was calibrated using a zero gas gas and a standard concentration of the standard curve is obtained and stored in the instrument, measurement, electrical instruments will be tested gas concentrations produced the signal with the standard concentration were compared, calculated the exact value of the gas concentration. Therefore, the calibration of the instrument at any time and the regular calibration of the instrument are essential to ensure the accuracy of the instrument. What needs to be explained is that many gas detectors are able to replace detection sensors at present. However, this does not mean that a detector can be equipped with different detectors at any time. Whenever the probe is replaced, it is necessary to recalibrate the instrument in addition to the necessary time for the activation of the sensor. In addition, it is suggested that before the use of all kinds of instruments, the instrument can be tested with the standard gas in response to ensure the accuracy and effectiveness of the instrument.

②注意各種不同傳感器間的檢測(cè)干擾

2. Attention to detection interference between different sensors

一般而言 ,每種傳感器都對(duì)應(yīng)一個(gè)特定的檢測(cè)氣體 ,但任何一種傳感器都不是對(duì)的。因此 ,在選擇一種氣體傳感器時(shí) ,都應(yīng)當(dāng)盡可能了解其它氣體對(duì)該傳感器的檢測(cè)干擾 ,以保證它對(duì)于特定氣體的準(zhǔn)確檢測(cè)。

In general, each sensor corresponds to a specific detection gas, but any one of the sensors is not absolutely specific. Therefore, when selecting a gas sensor, we should understand the interference of other gases to the sensor as far as possible, so as to ensure its accurate detection for specific gases.

③注意各類傳感器的壽命

Pay attention to the life of all kinds of sensors

各類氣體傳感器都具有一定的使用年限 ,即壽命。一般來講 ,在便攜式儀器中 ,可燃?xì)鈧鞲衅鞯膲勖^長 ,一般可以使用三年左右 ;光離子化檢測(cè)儀的壽命為四年或更長一些 ;電化學(xué)特定氣體傳感器的壽命相對(duì)短一些 ,一般在一年到兩年 ;氧氣傳感器的壽命比較短 ,大概在一年左右(電化學(xué)傳感器的壽命取決于其中電解液的干涸 ,所以如果長時(shí)間不用 ,將其密封放在較低溫度的環(huán)境中可以延長一定的使用壽命) 。固定式儀器由于體積相對(duì)較大 ,傳感器的壽命也較長一些。因此 ,要盡可能在傳感器的有效期內(nèi)使用 ,一旦失效 ,及時(shí)更換。

All kinds of gas sensors have a certain service life, that is, life. Generally speaking, the portable instrument, a long life of gas sensors, can generally be used for about three years; photoionization detector for a lifetime of four years or longer; specific electrochemical gas sensor life is relatively short, usually in one to two years; the oxygen sensor has the shortest life, probably in about a year (life depends on the electrochemical sensor in which the electrolyte dries up, so if not used for a long time, the sealing in low temperature environment can prolong the service life of certain). Because of the relatively large volume of the fixed instrument, the life of the sensor is longer. Therefore, it should be used as much as possible in the validity period of the sensor, and if it fails, it should be replaced in time.

④注意檢測(cè)儀器的濃度測(cè)量范圍

(4) pay attention to the measuring range of the concentration of the instrument

各類有毒有害氣體檢測(cè)器都有其固定的檢測(cè)范圍。只有在其測(cè)定范圍內(nèi)完成測(cè)量 ,才能保證儀器準(zhǔn)確地進(jìn)行測(cè)定。而長時(shí)間超出測(cè)定范圍進(jìn)行測(cè)量 ,就可能對(duì)傳感器造成性的破壞。

All kinds of toxic and harmful gas detectors have their fixed detection range. The accurate measurement of the instrument can be ensured only if the measurement is completed within the range of its measurement. It is possible to cause permanent damage to the sensor by measuring the range beyond the measurement for a long time.

比如 , 可燃?xì)怏w檢測(cè)儀器 , 如果不慎在超過100 %LEL 的環(huán)境中使用 ,就有可能徹底燒毀傳感器。而有毒氣體檢測(cè)器 ,長時(shí)間工作在較高濃度下使用也會(huì)造成損壞。所以 ,固定式儀器在使用時(shí)如果發(fā)出超限信號(hào) ,要立即關(guān)閉測(cè)量電路 ,以保證傳感器的安全?？傊?,有毒有害氣體檢測(cè)儀是保證工業(yè)安全和工作人員健康的有力工具。我們要根據(jù)具體的使用環(huán)境場(chǎng)合以及需要的功能 ,選擇合適的氣體檢測(cè)儀。目前 ,可供我們選擇的檢測(cè)儀包括固定式/便攜式、擴(kuò)散式/泵吸式、單氣體/多氣體、無機(jī)氣體/有機(jī)氣體等多種多樣的組合。只有選擇好了合適的氣體檢測(cè)儀器 ,才能真正做到事半功倍，防范于未然。

For example, a flammable gas detector, if used inadvertently in an environment exceeding 100%LEL, could completely burn up the sensor.  And the toxic gas detector, for a long time working at a higher concentration, can also cause damage. In order to ensure the safety of the sensor, the measuring circuit should be shut down immediately when the fixed instrument is used. In a word, the toxic and harmful gas detector is a powerful tool to ensure the safety of industry and the health of the workers.  We should choose the appropriate gas detector according to the specific environment and the functions needed. At present, the detectors we can choose include fixed / portable, diffuser / pump suction, single gas / multi gas, inorganic gas / organic gas and so on. Only by choosing the right instrument of gas detection can we get twice the result with half the effort and prevent it.