Advanced Pressure Calibration for Fieldpiece Gauges: A Specialised Guide

Introduction

In HVAC/R services, routine pressure sensor calibration is not always necessary. However, for those seeking the highest accuracy in their measurements, Advanced Tools presents a specialised guide on advanced pressure calibration for Fieldpiece gauges. This process involves aligning the pressure readings of your gauge with the pressure-temperature (P-T) chart of virgin refrigerant.

Understanding Advanced Pressure Calibration

Advanced pressure calibration differs from standard procedures. It's essential when precise measurements are critical, such as in laboratory settings or for specific technical diagnostics.

Calibration Steps

1. Calibrate ODDB Thermocouple: Refer to page 25 of your manual to calibrate the beaded thermocouple to the ODDB jack.

2. Prepare Refrigerant Cylinder: Store a virgin refrigerant cylinder upright in a stable environment for at least 24 hours.

3. Connect the Cylinder: Without moving the cylinder, connect it to either the HIGH or LOW side port of your gauge.

4. Secure the System: Close the VAC and REF valves. Cap the unused port or connect both ends of a refrigerant hose to it.

5. Select Refrigerant Type: Use the ARROWS on your gauge to choose the type of refrigerant in the cylinder.

6. Attach Thermocouple: Use tape to fix the ODDB thermocouple bead halfway up the cylinder.

7. Display ODDB Reading: Press VIEW to show the ODDB reading if it's not already displayed.

8. Open Valves: Open both HIGH and LOW side manifold valves, followed by the refrigerant cylinder valve.

9. Stabilize Readings: Allow time for the pressure readings and ODDB temperature to stabilize.

10. Initiate Calibration: Press MENU, use ARROWS to find 'Adv Pressure Cal', and press ENTER.

11. Complete Calibration: The sensors will display “Good” for a successful calibration or “Err” for an unsuccessful one, then revert to normal mode.

Troubleshooting 'Err' Messages

• Low Pressure Issues: Ensure the refrigerant cylinder is not empty and that all valves are open.

• Inaccurate Pressure: Check if the thermocouple was calibrated and attached correctly. Confirm the stability of the refrigerant cylinder's pressure and temperature, and ensure the selected refrigerant matches the one in the cylinder.

Conclusion

While not a routine necessity in typical HVACR service, advanced pressure calibration can be critical for maintaining the highest accuracy in certain scenarios. This specialised process requires careful attention to detail and understanding of the equipment and refrigerants involved. As always, Advanced Tools is here to provide you with the necessary tools and guidance for all your HVACR needs. Certainly! Here's a plain text section with an H2 heading and body text to accompany the HTML buttons you have for the user manuals.

Further Information

For detailed guidance and comprehensive insights about your device, please click on the user manual relevant to your model. These manuals provide step-by-step instructions, troubleshooting tips, and additional resources to help you make the most of your device. Whether you're a first-time user or a seasoned expert, these manuals are designed to assist you in getting acquainted with all the features and functionalities of your device.