How do I calibrate my Ralston Instruments QTVC Volume Controller

[LaPiper]

To ensure accurate pressure readings, calibrating your Ralston Instruments QTVC Volume Controller is essential. Follow these steps based on the manufacturer's guidelines:

1. Prepare the Volume Controller:

   • Close the Fill Valve.
   • Close the Vent Valve.
   • Set the Fine Adjust Valve to approximately 50% of its travel range.
   • Pull out the Balance Valve.

2. Increase Pressure:

   • Slowly open the Fill Valve until the pressure is just below your 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 pressure.

3. Moving Up-scale in Pressure:

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

4. Moving Down-scale in Pressure:

   • Pull out the Balance Valve to open it.
   • Slowly open the Vent Valve until the pressure is just above the next test point.
   • Close the Vent Valve.
   • Push in the Balance Valve to close it.
   • Use the Fine Adjust Valve for fine-tuning to the exact pressure at each test point as you move down the scale.

5. Venting the System:

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

By carefully following these steps, you can ensure your Ralston Instruments QTVC Volume Controller provides the accurate and reliable pressure measurements. Always consult the troubleshooting section of your user manual if you experience any difficulties during the calibration process or contact Ralston Instruments support for further assistance.