Calibrating a leveltrol for interface level measurement involves ensuring that the instrument accurately detects and measures the interface between two immiscible liquids in a vessel. Here's a general procedure for calibrating a leveltrol for interface level measurement:

1. Prepare Equipment:

   • Gather the necessary equipment, including the leveltrol instrument, a reference interface level gauge (if available), and any tools required for adjustments.
   • Ensure that the vessel containing the two liquids is properly configured and ready for calibration.

2. Establish Reference Points:

   • Identify the interface level range that needs to be measured by the leveltrol.
   • If available, use a reference interface level gauge or sight glass to establish reference points corresponding to the desired interface levels.

3. Zero Calibration:

   • Set the leveltrol to its lowest point within the interface level range.
   • Adjust the zero point of the leveltrol to match the reference interface level at this point.
   • Depending on the type of leveltrol, this adjustment may involve adjusting a mechanical float or probe, or configuring electronic settings.

4. Span Calibration:

   • Set the leveltrol to its highest point within the interface level range.
   • Adjust the span or sensitivity of the leveltrol to match the reference interface level at this point.
   • This adjustment ensures that the leveltrol accurately detects changes in interface level across the entire measurement range.

5. Intermediate Calibration Points:

   • Check the accuracy of the leveltrol at intermediate points within the interface level range.
   • Adjust the leveltrol as needed to ensure that it accurately tracks changes in the interface level at these points.

6. Verify Calibration:

   • Once adjustments are made, verify the calibration of the leveltrol by checking its performance against the reference interface level gauge or sight glass.
   • Confirm that the leveltrol accurately detects and measures the interface level between the two liquids within the specified range.

7. Finalize Calibration:

   • Document the calibration procedure, including the reference points, adjustments made, and any observed deviations.
   • Label the leveltrol with the calibration date and any relevant information.
   • Reinstall the leveltrol in the vessel and ensure it operates correctly under normal process conditions.

8. Regular Maintenance:

   • Schedule regular inspections and calibrations of the leveltrol to ensure continued accuracy and reliability.
   • Monitor the performance of the leveltrol over time and recalibrate as necessary to maintain accurate interface level measurement.

By following these steps, you can effectively calibrate a leveltrol for interface level measurement and ensure accurate and reliable detection of the interface between two immiscible liquids in a vessel. If you're unsure about any steps or require assistance, consider consulting the leveltrol manufacturer or a professional calibration service.