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    TSI 3077氣溶膠中和器 原版說明書

    下載次數(shù):82 瀏覽次數(shù):405發(fā)布時間:2015-11-16 17:04
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    Introduction

    When operated standalone or within an Electrostatic Classifier Model 3082with date code

    May 2014 or earlier, at certain flow rates, Radioactive Neutralizers Model 3077 and 3077A may not

    sufficiently charge the sample aerosol to an equilibrium distribution.

    This issue has occasionally been observed in the past (Liu and Deshler [2003] Aero. Sci. Technol.

    27:916-923) but the root cause was unclear. We are happy to report a thorough investigation and

    solutions to the issue. The following document explains it in detail and can be used to determine

    whether a specific experimental setup may or may not be affected. The use of a 3077(A) neutralizer

    in a 3080 classifier is not affected by this issue.


    What is the issue?

    The 3077(A) aerosol neutralizer may have reduced neutralization efficiency at certain flow rates

    when operated outside a classifier or within a 3082 classifier with date code May 2014 or earlier. In

    these configurations, the flow through the neutralizer may be laminar causing fluid near the

    centerline of the flow to pass through the neutralizer body rapidly while fluid near the outer edges

    of the flow recirculates within the neutralizer. The discrepancy in residence time within the

    neutralizer causes insufficient neutralization of the aerosol along the neutralizer centerline.

    Depending on the state of charge of the aerosol being measured, insufficient neutralization can lead

    to inaccurate size distributions and number concentrations. As shown in Figure 1, for a highly precharged

    aerosol, between sample flow rates of 0.7 L/min and 2.5 L/min, the insufficient charging of

    the 3077(A) neutralizer installed in a 3082 classifier results in incorrect total concentration

    measurements. Figure 2 shows the overestimation dependence on particle size for a highly precharged

    example aerosol.

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