Calibrating large-diameter flow meters like DN700 to DN3000 requires specialized equipment and careful procedures to ensure accurate measurements.
Here’s an overview of the equipment typically used for calibration:
1. Calibration Bench:
Flow Calibration Rig: A dedicated flow calibration rig capable of handling large flow rates and accommodating the size of DN700 to DN3000 meters. This rig includes:
Flow Measurement Standards: Master meters or reference flow measurement devices with traceable calibration to national standards (e.g., gravimetric methods, volumetric tanks).
Control Systems: Automated control systems to regulate flow rates and maintain stable flow conditions during calibration.
Data Acquisition System: Instruments for recording and analyzing flow data, ensuring precise comparisons between the flow meter under test and the reference standard.
2. Flow Measurement Instruments:
Master Meters: These are high-precision flow meters used as the reference standard to calibrate the flow meter under test.
They are typically of sufficient size and accuracy to cover the flow range of DN700 to DN3000 meters.