仪器概述
正丁醇冷凝粒子计数器（英文名：Airmodus A20 Butanol Condensation Particle Counter；英文缩写：A20bCPC）由位于芬兰的Airmodus公司研发制造。A20bCPC是一款基于现代超细气溶胶测量技术研发的冷凝粒子计数器。在很低浓度和高浓度粒子环境中均能够精确计数，是大气环境监测和气溶胶研究的理想工具。
A20bCPC可以应用于所有领域的气溶胶粒子测量研究；尤其当精确度和灵敏度成为核心时，A20bCPC必然成为有力、可靠的工具。它可以方便地测量7nm以上的气溶胶粒子。
A20bCPC是用途广泛的计数器，既可独立运行，测量颗粒物总数浓度；也可以接入不同类型的气溶胶测量系统，用于计数。该仪器易于操作、使用。前面板的触屏可以显示当前浓度读数和仪器诊断参数，所有设置也可通过触屏迅速调整。
A20bCPC也可以兼容Airmodus粒子放大器A10。当所研究粒径降低到1nm时，请选用A10PSM！
技术优势
低浓度下高效率计数：仪器经过特殊设计，没有稀释进样气流
高浓度下的高精度测量：单个计数模式下，量程高达30000个/cm3；更高浓度时，总散射模式订正会自动启用
触屏显示及操控同时，通过控制软件更方便地调试并采集数据；仪器软件随仪器邮寄
所有连接均可轻松访问
应用范围
气溶胶粒子测量研究的所有领域，包括：大气环境监测和气溶胶研究，室内空气质量评估，过滤器和空气滤清器测试，大气和气候研究，粒子计数器校准，燃烧和发动机尾气的研究，呼吸检测和暴露评价，健康影响研究，纳米技术研究。
技术指标
粒径测量范围：7-1000 nm，50%切割效率对应7nm
浓度测量范围：0-100000#/cm3
在单颗粒模式下，最高测量数浓度可达30000#/cm3，且重合率低于10%；更高浓度时，自动启用总散射模式订正
采样流量范围：1 LPM，通过临界小孔片/限流孔控制
使用液体：正丁醇
运行温度范围：15 - 35 °C
通信接口：
模拟信号输入：BNC连接器，0-10V（用于读取外部设备信号）；
模拟信号输出：BNC连接器，0-10V，可选输出方式（线性浓度，DMA电压控制）；
脉冲信号输出：BNC连接器；
串口输出：RS-232，以太网：8线RJ45；
USB：B型连接器连接方式：外部真空度：1/4英寸的不锈钢管；入口：1/4英寸的不锈钢管；
外部真空要求：常温常压下，小于0.4 bar
尺寸：260 * 230 * 400（H*W*D mm）
重量：10.5kg
电源：88 - 264 VAC，320 W
工作原理
由于纳米级颗粒物不能通过光学进行测量，该类粒子必须通过冷凝在其表面的高饱和度工作流体使其生长至光学可测量范围，该仪器可测粒径范围为7-1000nm。A20bCPC选择正丁醇作为冷凝剂。
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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