LDARtools phx42 - Manual Calibration

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Manual Calibration
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 and a concentration above 2 PPM. !
• Calibration overwrites all prior calibrations. Back-to-back calibrations with different probes does nothing but
overwrite the previous calibration.
1. Install a new filter.
2. Run the self-check on the 42App before starting calibrations.
3. Check Probe flow using Flow Meter Assembly (phx42) - LDAR# 4024 (0.2-0.3 liters/min).
4. Tap the menu button.
5. Tap Calibrate.
6. Tap Cal All.
7. Type the actual PPM for the cylinder onto the PPM field.
8. Apply gas (begin with 0 PPM) and then tap Generate.
9. Let the calibration run.
The phx42 will sample the gas, then display the “Calibration Complete” message.
10. Repeat Steps 7-9 until all the Calibration Spans have been added, then tap Done.
TECH TIP: If you experience high Response Times, do a self-check.
TECH TIP 2: Best practice would be to add “Calibrate filter” step to the end of your daily calibration
form.
FAQ
What do I do about slow recovery during Daily Calibration?
If, during the confirmation phase after Daily Calibration, it takes more 2 minutes to
recover to the 2 PPM level, you can recalibrate to Zero by clicking the Cal Zero
button in the 42App. ..
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