儀器概述
正丁醇冷凝粒子計(jì)數(shù)器（英文名：Airmodus A20 Butanol Condensation Particle Counter；英文縮寫(xiě)：A20bCPC）由位于芬蘭的Airmodus公司研發(fā)制造。A20bCPC是一款基于現(xiàn)代超細(xì)氣溶膠測(cè)量技術(shù)研發(fā)的冷凝粒子計(jì)數(shù)器。在很低濃度和高濃度粒子環(huán)境中均能夠精確計(jì)數(shù)，是大氣環(huán)境監(jiān)測(cè)和氣溶膠研究的理想工具。
A20bCPC可以應(yīng)用于所有領(lǐng)域的氣溶膠粒子測(cè)量研究；尤其當(dāng)精確度和靈敏度成為核心時(shí)，A20bCPC必然成為有力、可靠的工具。它可以方便地測(cè)量7nm以上的氣溶膠粒子。
A20bCPC是用途廣泛的計(jì)數(shù)器，既可獨(dú)立運(yùn)行，測(cè)量顆粒物總數(shù)濃度；也可以接入不同類(lèi)型的氣溶膠測(cè)量系統(tǒng)，用于計(jì)數(shù)。該儀器易于操作、使用。前面板的觸屏可以顯示當(dāng)前濃度讀數(shù)和儀器診斷參數(shù)，所有設(shè)置也可通過(guò)觸屏迅速調(diào)整。
A20bCPC也可以兼容Airmodus粒子放大器A10。當(dāng)所研究粒徑降低到1nm時(shí)，請(qǐng)選用A10PSM！
技術(shù)優(yōu)勢(shì)
低濃度下高效率計(jì)數(shù)：儀器經(jīng)過(guò)特殊設(shè)計(jì)，沒(méi)有稀釋進(jìn)樣氣流
高濃度下的高精度測(cè)量：?jiǎn)蝹€(gè)計(jì)數(shù)模式下，量程高達(dá)30000個(gè)/cm3；更高濃度時(shí)，總散射模式訂正會(huì)自動(dòng)啟用
觸屏顯示及操控同時(shí)，通過(guò)控制軟件更方便地調(diào)試并采集數(shù)據(jù)；儀器軟件隨儀器郵寄
所有連接均可輕松訪(fǎng)問(wèn)
應(yīng)用范圍
氣溶膠粒子測(cè)量研究的所有領(lǐng)域，包括：大氣環(huán)境監(jiān)測(cè)和氣溶膠研究，室內(nèi)空氣質(zhì)量評(píng)估，過(guò)濾器和空氣濾清器測(cè)試，大氣和氣候研究，粒子計(jì)數(shù)器校準(zhǔn)，燃燒和發(fā)動(dòng)機(jī)尾氣的研究，呼吸檢測(cè)和暴露評(píng)價(jià)，健康影響研究，納米技術(shù)研究。
技術(shù)指標(biāo)
粒徑測(cè)量范圍：7-1000 nm，50%切割效率對(duì)應(yīng)7nm
濃度測(cè)量范圍：0-100000#/cm3
在單顆粒模式下，最高測(cè)量數(shù)濃度可達(dá)30000#/cm3，且重合率低于10%；更高濃度時(shí)，自動(dòng)啟用總散射模式訂正
采樣流量范圍：1 LPM，通過(guò)臨界小孔片/限流孔控制
使用液體：正丁醇
運(yùn)行溫度范圍：15 - 35 °C
通信接口：
模擬信號(hào)輸入：BNC連接器，0-10V（用于讀取外部設(shè)備信號(hào)）；
模擬信號(hào)輸出：BNC連接器，0-10V，可選輸出方式（線(xiàn)性濃度，DMA電壓控制）；
脈沖信號(hào)輸出：BNC連接器；
串口輸出：RS-232，以太網(wǎng)：8線(xiàn)RJ45；
USB：B型連接器連接方式：外部真空度：1/4英寸的不銹鋼管；入口：1/4英寸的不銹鋼管；
外部真空要求：常溫常壓下，小于0.4 bar
尺寸：260 * 230 * 400（H*W*D mm）
重量：10.5kg
電源：88 - 264 VAC，320 W
工作原理
由于納米級(jí)顆粒物不能通過(guò)光學(xué)進(jìn)行測(cè)量，該類(lèi)粒子必須通過(guò)冷凝在其表面的高飽和度工作流體使其生長(zhǎng)至光學(xué)可測(cè)量范圍，該儀器可測(cè)粒徑范圍為7-1000nm。A20bCPC選擇正丁醇作為冷凝劑。
Airmodus Condensation Particle Counters are designed to count individual aerosol particles accurately from very low to high concentrations. They are ideal for ambient air monitoring as well as aerosol research.
The A20 is a robust and reliable tool for aerosol particle measurements in all applications where precision and sensitivity is of the essence. It is a user-friendly tool for counting aerosol particles larger than 5 nm (by request A20 can be delivered with a cut-off between 5 – 10 nm, e.g. for ambient measurements 7 nm).
A versatile particle counter
The A20 can be used both as a stand-alone instrument for measuring the total particle number concentration, and as a counter in different kinds of aerosol measurement systems. It is easy to use and handle. All settings can be quickly adjusted from a handy touch screen, which also displays the current concentration reading and instrument diagnostics.
The A20 is also compatible with the Airmodus Particle Size Magnifier A10. Use the A10 when you want to study particles as small as 1 nm!
Benefits of the A20
- High statistics for low concentrations: the instrument is specially designed for precise particle counting and the sample flow is not diluted
- High accuracy for high concentrations:
up to 30 000#/cm3 in single particle counting mode, for higher
concentrations the Total Scattering Mode Correction is automatically applied
- In addition to the easy to use touch screen, adjusting the settings and data logging is easy. User-friendly
operation software is delivered with the instrument
- All connections optimized for easy access
Particle size range 5 nm – 2.5 μm
Dp50% = 5 nm* (on request 5 – 10 nm)
Concentration 0 – 100 000 #/cm3
Up to 30 000 #/cm3 in single particle counting mode with coincidence <10%; higher concentrations with Total Scattering Mode Correction
Aerosol sample flow Nominal flow 1 lpm, controlled with a critical orifice
Response time t90 < 3 s
False counts <0.001 #/cm3
Working fluid n-Butanol (>99.5%)
Operating temperatures
Saturator: 39oC Condenser: 15oC Optics: 40oC
Sample conditions
Pressure: 75 to 105 kPa
Relative humidity: 0 to 95% non-condensing (preferably <40%)**
Environmental conditions
Temperature: 15oC to 35oC Pressure: 75 to 105 kPa
Relative humidity: 0 to 95% non-condensing
Communication Analog in: BNC connector, 0 to 10 V (reading data of external sensor) Analog out: BNC connector, 0 to 10 V, user-selectable function output (linear concentration, also DMA voltage control)
Pulse out: BNC connector
Serial: RS-232
Ethernet: RJ45
USB: type B connector
All communication based on ASCII character-encoding scheme.
Fittings External Vacuum: 1/4 in. stainless steel tube
Inlet: 1/4 in. stainless steel tube
Software Airmodus A2X software for online data acquisition (for Microsoft Windows)
External vacuum requirement
100 - 400 mbar pressure at NTP (or <40% of inlet pressure)
Power requirements 100 - 240 VAC
max. 320 W
universal AC input/full range
Dimensions and weight
260x230x400 (height x width x depth in mm)
10.5 kg
Shipping conditions Temperature: 0 - 40oC
Relative humidity: <95% non-condensing
The instrument should be shipped in upright position and should be protected against tremor and blows.
*) Cut-off size in mobility equivalent diameter. See calibration certificate. On request the cut-off can be calibrated to be in the range 5 – 10 nm.
**) With high relative humidity, an aerosol drier should be used to prevent excess water condensation inside the instrument. Microsoft and Windows are registered trademarks of Microsoft Corporation.
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