How to deal with an ultrasonic flow meter being out of range

What is the diameter? What was the traffic volume before?

This post was last edited by zxg.wylton on 2018-7-9 08:21. First, determine whether the flow rate has indeed increased; if so, adjust the range of the vortex flow meter. If there is temperature and pressure compensation involved, check that as well. Then calculate the Reynolds number, check the sample, and determine the operating condition of the flow meter. The question of what deviation is within a reasonable range for vortex flowmeters isn’t really a question at all – no one can answer it. Generally speaking, the smaller the deviation, the better; but first and foremost, it’s necessary to ensure that measurement is possible. For example, the flow rate when the valve is completely closed should be 0, and the flowmeter should adjust accordingly to actual flow changes. If even this cannot be achieved, discussing deviations is meaningless. As long as the flow meter operates in a logically sound manner, it doesn’t matter how large the deviation is; simply send it for inspection on a regular basis as needed. For applications with extremely high precision requirements, a mass flow meter can be considered.

First, verify the specifications of the selected instrument, mainly the density. A zero-point calibration can be performed first, after which the process can recalculate the material balance to determine whether this value is accurate. Meters generally have a certain range margin. If it exceeds the maximum range, consider replacing the gauge.

I can check this diameter; for this model that uses gas, what is the maximum flow rate? This is the maximum flow rate of the table itself; the flow rate can be adjusted within that range. If it exceeds this limit, it indicates that the table is no longer suitable for use; it’s important to confirm with the process engineers just how high the flow rate is

Generally, vortex flowmeters require specialized software to calculate the excess range, pressure loss, and accuracy. If the instrument permits it, the upper range limit should be compatible with the current flow rate, so there should be no problem. It is best to have the manufacturer recalculate and verify the new process conditions and medium parameters.

Verify whether the actual operating conditions match those specified on the flow meter, whether temperature and pressure compensation has been applied, and whether the instrument’s parameter settings are correct. If it is confirmed that there are no issues, then check with the process engineers to find out the approximate actual volume. Also, communicate with the manufacturer to see what range can be increased; if the range is too large and cannot meet the requirements, it will be necessary to replace the gauge.

Sorry, I just finished working on it – it’s a DN150 diameter pipe. Previously, the flow meter indicated values between 7,000 and 8,000 cubic meters; the maximum amount of dry air converted to nitrogen was 7,200 cubic meters per hour or less

Thank you; both the on-site flow rate and that of the DCS have increased and exceeded the range. The medium used in the vortex flow meter is compressed air; the readings are displayed remotely on the DCS. Monthly cumulative amounts are used to calculate economic indicators, and an excess amount of compressed air can prevent these indicators from being met. The flow rate of dry air entering the device is 7,200 standard cubic feet per hour or less; if I change this value to 7,200 or 7,500, will there still be a risk of exceeding the specified range?

Medium: compressed air; imbalance in process materials. The dry air supplied to the nitrogen generation unit should be 7200 standard cubic feet per hour or less, with a maximum amount of 9557 standard cubic feet per hour

Pipe diameter: DN150; medium: compressed air; maximum instantaneous flow rate: 9557 cubic meters. The air intake volume of the pre-drier in the nitrogen generation system should be controlled at 7,200 standard cubic meters per hour or less