In order to ensure that an ultrasonic flowmeter is providing reliable readings, the instrument needs to be checked and adjusted during the calibration process. The following is a list of the general actions that need to be taken to calibrate an ultrasonic flowmeter:
Select the reference source equipment for calibration:
A known and reliable flow rate measuring tool, such as a volumetric flow metre or a gravimetric flow metre, serves as the reference source. The reference source needs to be traceable to an accepted standard and calibrated.
Install the ultrasonic flowmeter:
Mount the ultrasonic flowmeter in accordance with the instructions provided by the manufacturer, making sure that the sensors are correctly aligned and that they are firmly fastened.
Prepare the source of the reference:
Following the procedures outlined in the manual provided by the manufacturer, connect the reference source to the ultrasonic flowmeter. Before moving forward with the calibration, it is important to check that the reference source is stable and has stabilised.
Ultrasonic Flow meter to be adjusted:
In order to calibrate the ultrasonic flowmeter, first power on the device and then select the measurement mode that corresponds to your needs (for example, volumetric flow rate or velocity). If necessary, make adjustments to the ultrasonic flowmeter’s settings in order to achieve an accurate representation of the properties of the reference source (such as density, viscosity, temperature, and pipe diameter).
Analyze the flow rate & measure the values:
Determine the flow rate by directing a stream of liquid to pass through an ultrasonic flowmeter while simultaneously connecting it to a reference source. Record the flow rate being measured by the ultrasonic flowmeter as well as the flow rate being measured by the reference source at the same time intervals (for example, every 30 seconds).
Comparison of Values:
Values should be compared, and a differential should be computed between the flow rate values obtained from the ultrasonic flowmeter and those from the reference source. If the difference is outside the permitted range, the ultrasonic flowmeter needs to be adjusted so that it reads correctly.
Check the repeatability:
Repeat the process of measurement and comparison multiple times, making sure that the results are consistent each time, and then verify the results each time. After you have determined that the ultrasonic flowmeter provides correct readings, you should record the findings of the calibration by noting the date, the individual who performed the calibration, and the calibration equipment that was utilized.
It is essential to keep in mind that ultrasonic flowmeters need to be calibrated on a regular basis, particularly if they are used frequently or in applications that are very vital.