One of the most commonly employed instruments in the category of handheld condensation particle counters (CPCs) is the TSI 3007, which employs a simplified system for achieving a temperature difference between its saturator and its condenser in view of increasing portability, energy efficiency and autonomy. As a result, particle growth and consequently the detection efficiency of the instrument can be affected by the measurement conditions. In this work we measure the detection efficiency of the TSI 3007 CPC under temperatures and pressures that differ from standard conditions. Our results show that the performance of the CPC has a strong temperature dependence in the range of 5–30 °C, whereas it is not affected by ambient pressure when this varies between 0.7 and 1.0 atm. The temperature dependent detection efficiency of the instrument becomes significant at sizes below 20 nm. Recording the temperature at which this CPC is operated is therefore strongly advised, especially when required to determine the number concentration of sub-20 nm aerosol particles.

TSI 3007 是手持式冷凝粒子计数器 (CPC) 类别中最常用的仪器之一，它采用简化系统来实现饱和器和冷凝器之间的温差，以提高便携性、能源效率和自主性。因此，粒子生长以及仪器的检测效率会受到测量条件的影响。在这项工作中，我们测量了 TSI 3007 CPC 在不同于标准条件的温度和压力下的检测效率。我们的结果表明，CPC 的性能在 5-30°C 范围内具有很强的温度依赖性，而当环境压力在 0.7 到 1.0 个大气压之间变化时，它不受环境压力的影响。仪器的温度相关检测效率在尺寸低于 20 nm 时变得显着。因此，强烈建议记录此 CPC 运行时的温度，尤其是在需要确定亚 20 nm 气溶胶颗粒的数量浓度时。