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v3.1

Minor Versionm

by Geoff Henshaw

Introduction

Professionals may choose to apply a Span value for a specific project, area, and/or aerosol, using gravimetric analysis as their source of input.

This method may be used to increase the degree of accuracy of Ranger|Dust's concentration readings.

This is because the manufacturer calibrates these instruments using ISO 12103 Test Dust. Aerosols encountered in the field--having different optical properties from the Test Dust--will all give different readings.

Parts

No parts specified.

Video Overview

How to apply a custom calibration to Ranger | Dust

  1. Attach a PMX sensor head to Ranger and turn it on Enter the Settings menu by pressing and holding the LEFT ARROW Select the Calibrate submenu
    • Attach a PMX sensor head to Ranger and turn it on

    • Enter the Settings menu by pressing and holding the LEFT ARROW

    • Select the Calibrate submenu

    • Select the Span Calibration menu

    • Verify that the Span is set to 1.000 for all channels.

    • Aeroqual recommends the use of a gravimetric sampling setup as your reference

    • Simultaneously begin and end the sampling periods of both Ranger|Dust and your chosen reference

    • Once your co-location sampling is completed, calculate the average mass concentration of your reference. This becomes PMref

    • Next, calculate the average mass concentration of Ranger|Dust. This becomes PMranger

  2. Calculate the ratio of the PMref over PMranger. This becomes your Span
    • Calculate the ratio of the PMref over PMranger. This becomes your Span

  3. Enter Settings and navigate to Calibrate>Span Calibration
    • Enter Settings and navigate to Calibrate>Span Calibration

    • On the relevant channel, adjust the Span as the Span from the previous step

    • Exit the Settings menu by pressing and holding the LEFT ARROW

    • If you have applied a Span to some channels, but not others, you may notice the concentration readings for a smaller fraction channel exceeds the concentration readings of a larger fraction channel. For example, PM2.5 > TSP.

  4. If you remove the PMX sensor head from any Ranger base, and attach it to a different Ranger base, the Span will be retained
    • If you remove the PMX sensor head from any Ranger base, and attach it to a different Ranger base, the Span will be retained

Conclusion

Your PMX sensor head will now give readings that account for a specific project, area, or aerosol.

Margaret Grattan

Member since: 03/09/2022

13 Guides authored

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