How to calibrate a Ralston Instruments QTVC Volume Controller?

[DeHarley]

Calibrating your Ralston Instruments QTVC Volume Controller is crucial for maintaining precise pressure readings. Here's a straightforward, step-by-step guide to help you calibrate your device:

1. Prepare the Volume Controller:

   • Ensure the Fill Valve is closed.
   • Ensure the Vent Valve is closed.
   • Set the Fine Adjust Valve to the midpoint (50% of its travel).
   • Pull out the Balance Valve.

2. Increase Pressure:

   • Slowly open the Fill Valve until the pressure is just below the first test point.
   • Close the Fill Valve.
   • Push in the Balance Valve to close it.
   • Use the Fine Adjust Valve to precisely adjust the reference gauge to match the exact test point.

3. Ascending Pressure Calibration:

   • Pull out the Balance Valve to open it.
   • Slowly open the Fill Valve until the pressure is just below the subsequent test point.
   • Close the Fill Valve.
   • Push in the Balance Valve to close it.
   • Fine-tune to achieve the exact pressure reading at the test point.
   • Repeat these steps for each test point, working your way up the pressure scale.

4. Descending Pressure Calibration:

   • Pull out the Balance Valve to open it.
   • Slowly open the Vent Valve to bring the pressure just above the next test point.
   • Close the Vent Valve.
   • Push in the Balance Valve to close it.
   • Fine-tune to the exact test point reading.

5. Venting the System:

   • Pull out the Balance Valve.
   • Open the Vent Valve to safely release any remaining pressure.

By following these calibration steps, you can confidently ensure your Ralston Instruments QTVC Volume Controller delivers accurate and dependable pressure measurements. If you encounter any difficulties, consult the troubleshooting section in the user manual or contact Ralston Instruments support for further assistance.