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v1.5

Minor Versionm

by Geoff Henshaw

Introduction

RGR CALKIT can be used to calibrate all Aeroqual sensor heads except ammonia, perchloroethylene, ozone and dust.

Gas calibration using the RGR CALKIT should always be completed in a location with adequate ventilation.

  1. The calibration accessory has barbed fittings that are intended to fit with 1/8” ID tubing.
    • The calibration accessory has barbed fittings that are intended to fit with 1/8” ID tubing.

    • Care should be taken in selecting a tubing material that is appropriate for the type of gas that you will be using to calibrate the sensor head.

    • PVDF tubing is appropriate for most gases but the tubing datasheet should be consulted for a full list.

    • Either side of the calibration accessory can be designated the inlet or the outlet.

    • Not all gas that enters through the inlet exits through the calibration accessory outlet; be advised that some gas exits through the sensor head exhaust. Depending on your calibration gas of choice and concentration levels, you may need to perform this calibration under a fume hood.

  2. Make sure the valve on your flow gas regulator is fully off.
    • Make sure the valve on your flow gas regulator is fully off.

    • Screw the gas regulator onto your gas cylinder. When the regulator is correctly fitted, the pressure indicator will show the cylinder pressure.

    • Always point the cylinder and regulator away from yourself and others when attaching or removing a pressure regulator.

    • Secure the cylinder so it can't be knocked over while the regulator is attached.

  3. Connect tubing to gas source and ventilation.
    • Connect tubing to gas source and ventilation.

    • Either side of the calibration accessory can be designated the inlet or the outlet

  4. Attach the sensor head to Ranger
    • Attach the sensor head to Ranger

    • Turn Ranger On

    • Attach the calibration accessory to the sensor head

  5. Check the cylinder pressure to ensure there's enough gas to perform the calibration (10% of full pressure should be enough).
    • Check the cylinder pressure to ensure there's enough gas to perform the calibration (10% of full pressure should be enough).

    • Gently turn the regulator valve anticlockwise and flow the target gas at >1L/min until the reading stabilizes (about 10 minutes).

  6. Wait for the gas reading to stabilize on the display of the Ranger
    • Wait for the gas reading to stabilize on the display of the Ranger

  7. Press and hold the LEFT arrow key to enter the Settings menu Navigate down and selectm 'Calibrate' and then ‘Span Calibration’ Enter the span adjustment menu and calculate the required gain using the formula
    • Press and hold the LEFT arrow key to enter the Settings menu

    • Navigate down and selectm 'Calibrate' and then ‘Span Calibration’

    • Enter the span adjustment menu and calculate the required gain using the formula

  8. Adjust the gain value in the Span Calibration menu to match your calculated value
    • Adjust the gain value in the Span Calibration menu to match your calculated value

    • Press enter

    • Wait for the next sensor reading, which will have the new gain applied

    • The value is not applied until you press enter

    • The new gain value will be applied on the next measurement cycle; the value displayed at the bottom may take 1-2 minutes to update

    • Confirm the new reading matches your expected value.

    • Exit the span calibration menu.

    • Turn off the gas regulator.

    • Pack up.

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

Conclusion

Margaret Grattan

Member since: 03/09/2022

13 Guides authored

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