On-site zero calibration of flowmeter
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May I ask if there is any further calibration work to be done on all the flowmeters once they arrive at the site?
Generally, after installation it is necessary to adjust the zero point. For devices such as mass flow meters, electromagnetic flow meters, and vortex flow meters, it may be sufficient not to adjust the zero point; however, differential pressure flow meters definitely require such adjustment, and there are specific methods for doing so. Many other types of flow meters also need to have their zero points adjusted
Most online flowmeters cannot be calibrated on-site; they need to be sent to a metrology department for verification.
It’s generally not necessary. After installation and power supply, calibrate it with the system, make sure the connections are correct, check the zero point; if there is any drift, address it, otherwise wait for the water to be connected.
The original poster encountered some problem and started asking lots of questions; it seems you’re not a beginner, but you are truly naive. If you can’t do it, don’t force yourself.
Reasons for zero adjustment: Stress effects during installation; the influence of medium temperature on the instrument. The impact of additional errors generated during the installation process. The gravitational effect of the instrument itself during installation. Zeroing is the most basic step in putting field instruments into use.
Zeroing is the operation performed after zero offset
After the new flow meter is installed, all that’s needed is to set the range and units; zeroing is required on-site only when there is a significant difference in density between the actual fluid and water or air.