Installation issues of mass flow meters
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May I ask: Our mass flow meters are used to measure liquids, and two flow meters are required to ensure measurement accuracy. One is used for measurement and the other for verification; what distance should be maintained between the two flow meters to ensure measurement accuracy?
For liquid measurement, when the temperature is not within the phase transition range – that is, when vaporization is unlikely to occur – the measurements taken by a mass flow meter should be quite accurate. Apart from situations where high precision is required, there is generally no need to calibrate such meters. Moreover, the price of mass flow meters is not low either, unless your organization has plenty of money.
To be honest, I haven’t seen any use of two quality scales. I have only seen two meters placed side by side, one used for control and the other for measurement. As for installation issues, you can refer to the installation instructions; they usually specify the distance between the throttle elements at the front and back. You can treat the gauge as a throttle element.
Two flow meters are used in the PVC industry
If two flowmeters are used, one for measurement and the other for calibration, and they are installed in series, the distance between them doesn’t matter; the key to installing a mass flowmeter is to ensure vibration protection and proper fixation of the pipelines.
Install two units; if the data volumes of the two are different, which one should be taken as the standard?
Generally, a mass flow meter and a weighing device are installed for calibration purposes, right?
The installation of mass flow meters does not require straight pipe sections; therefore, when installing two mass flow meters in the same pipeline, factors such as pipeline layout, support, and maintenance should be taken into consideration.
Mass flow meters are expensive, and since they are used for measurement, they need to be calibrated once a year. First, it must be installed in the appropriate location according to the manufacturer’s installation instructions. The two units should be installed in series, with proper support to prevent measurement errors caused by the stresses resulting from installation. Since mass flow meters are not sensitive to the velocity distribution of the fluid and are unaffected by laminar or turbulent flow conditions, they do not require straight pipe sections during installation; therefore, there are no special requirements regarding the installation distance. The installation layout must be reasonable and aesthetically pleasing, as well as easy for maintenance and data reading – in other words, it should be user-friendly.
For any special requirements, it is sufficient as long as the straight pipe section between the two flowmeters meets those requirements
Haven’t seen it? ? Our company also uses 4 of them on the sulfuric acid addition pipelines; 2 are used per pipeline, with two pipelines running in parallel, for a total of 4
With money to spare, measure one and calibrate one? The one who does the calibration is the one who pays!
We only use two parallel mass meters when the main diameter is too large, and we determine the total flow rate by summing the values. So two flowmeters are used to measure mass only in special cases!
The normal flow rate is only a little over ten kilograms per hour; when there is a significant difference between the two flow meters connected in series, it is necessary to switch to the other parallel circuit and calibrate the meter with the larger discrepancy
The mass flow meter should be installed in a vertical pipe section – in horizontal sections, the density of the fluid passing through it is uneven, which can lead to inaccurate readings; when installed vertically, the density of the fluid passing through it remains more uniform, resulting in more accurate measurements