Manual Calibration with Gas Bags

The phx42 must be ignited for at least 15 minutes prior to calibration, drift, as well as any monitoring that is going to be performed.

The phx42 should not be calibrated with On-Demand regulators as they do not consistently simulate the monitoring process. The vacuum required to open and hold open the valve can and does affect calibration accuracy.

  • Before you begin manually calibrating with gas bags, please take note of these precautions to ensure the most accurate calibration possible:

    • LDARtools recommends using a SpanBox.

    • When filling bags, do not fill them completely. Doing so is not only bad for the bag, it can also cause calibration issues.

    • Make sure the bag is not pinched or pressed during calibration.

    • Make sure the bag valve is fully open to ensure proper flow.

    • Always start with the lower concentration and work your way up to the highest concentration when calibrating, confirming, or drifting.

    • Always calibrate a 0 PPM (Zero Air) and a concentration above 2 PPM Methane in AIR.

    • Calibration overwrites all prior calibrations. Back-to-back calibrations with different probes do nothing but overwrite the previous calibration.

  1. Confirm or install a clean probe tip filter.

  2. Run the self-check on the phxApp before starting calibrations.

  3. Check probe flow using the phx42 flow meter assembly (LDAR# 4024) (0.2-0.3 L/min).

  4. Allow for 15-minute warm-up period.

  5. Tap Menu.

  6. Tap Calibrate.

  7. Tap Calibrate All.

  8. Type the actual PPM for the cylinder onto the PPM field.

  9. Apply gas (begin with 0 PPM) and then tap Generate.

  10. Let the calibration run. The phx42 will sample the gas and then display the “Calibration Complete” message.

  11. Repeat Steps 7-9 until all the calibration spans have been added, then tap Done.


Tech Tips:

  • If experiencing long response times, do a self-check and report the issue in the comments.

  • In the event of a drift failure, report an issue after completing a probe integrity check.

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