v4.2

Minor Versionm

by Geoff Henshaw

Calibration - PMX flow

Written By: Margaret Grattan (and one other contributor)
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Difficulty

Difficult

Steps

4

Time Required

00:10:00

Sections

1

Flags

0

Introduction

Continued use in high-aerosol concentrations may affect the flow of the PMX sensor. If you wish to calibrate the flow of the Ranger|Dust instrument, you may do so with the help of a flow meter.

Because the presence of the flow meter in the flow path will cause some restriction, it will directly affect the flow rate reading.

  1. Note down the CONVERSION FACTOR (CF) from this list of commonly used reference flow meters.

    • Note down the CONVERSION FACTOR (CF) from this list of commonly used reference flow meters.

    • The CF varies by flow meter model.

    • If your flow meter is not on this list proceed to step 2, otherwise go to step 3

  2. This step is optional

    • This step is optional

    • A new Ranger | Dust has a factory-calibrated PMX sensor with 1.00 LPM flow

    • Twist and pull to remove the PMX inlet

    • Attach your reference flow meter to the PMX sensor head with the correct tubing (see parts needed)

    • Note the observed flow reading on the reference flow meter, FR

    • Calculate the CORRECTION FACTOR (CF) according to CF = 1.00/FR

    • Note: The presence of the reference flow meter in the flow path causes a restriction that affects the measured flow rate. Hence the measured flow will be less than 1.00 LPM. The CF enables the actual flow (FA) to be determined. FA = CF x FR

    • Twist and pull to remove the PMX inlet

    • Attach the flow meter to the PMX sensor head with the correct tubing

    • Ensure any other external tubing has been removed from the flow meter (or Ensure flow meter has same tubing as when measuring CF)

    • Calculate the actual flow (FA)

    • The acceptable flow criteria for FA is 1.00 +/- 0.02 LPM.

    • If the PMX meets the flow criteria the flow is correct. If the flow is outside the criteria proceed to step 4 to adjust the flow.

  4. Enter the Settings menu by pressing and holding the LEFT ARROW Navigate to the Calibrate menu

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

    • Navigate to the Calibrate menu

    • Adjust the fan speed higher or lower until the PMX actual flow (FA) falls within 0.98 < FA < 1.02

    • Press the CENTER BUTTON to confirm the selected fan speed

    • Hold the LEFT ARROW to return to the main screen

    • Refit the PMX inlet

Conclusion

Your PMX is now calibrated.

For further support, contact Aeroqual Support.

Author

with 1 other contributor

Margaret Grattan

Member since: 03/09/2022

13 Guides authored