Do fluid properties affect the outcome of the measurement?
The parameters of the fluid should be well defined and be consistent, otherwise it is not possible to measure accurately. Any deviation from the original model conditions on the density or viscosity of the fluid added some error, unless it scales properly. Some models reduce errors due to the viscosity of the fluid.
What factors should be considered when working converged corrosive?
Flowmeters variable section can be manufactured with high strength materials. However, if the tapered tube made of glass or transparent plastic is not resistant to corrosion, it is possible to have a direct visual reading. In these cases, any metal flow indirect reading scales are a viable alternative.
How do you define the accuracy of a measurement?
The error of a measure is always given as a percentage of full scale value (% span). Each manufacturer offers accuracies different counters, all standardized. The error limit for high-precision meters is around 0.5% of FSV, while a value of about 5% of FSV is not unusual for accountants simple scale plastic tapered tube. High-level counters are provided with a calibration history. The wet calibration can reduce uncertainty. in measurement, especially at the lower end of the field measurement values.
Is this type of counters you can generate electrical signals?
Even simple counters can be equipped with limit value detectors mounted on the tapered tube. The high-level devices have a measured value sensor with analog output. There are also commercially available flowmeters with a variable section PROFIBUS interface.
How to prevent installation errors?
In general, variable-section flow meters mounted in vertical lift stages. No need to input and output sections. On horizontal pipes can be installed special tapered models, but require a minimum nominal diameter of 6 times the nominal diameter upstream and 3 times the nominal diameter downstream, as recommended by each supplier.
Can use variable-section flow meters processes that produce occasional pressure overload?
Avoid applications of this upo. It is especially important to be cautious if the process involves dangerous gases or liquids. The strong pressure overload can push the fluid up to enough speed to hit the glass tapered tube and break the flow.
What are the limits of temperature and process pressure measurement for this principle?
Models with tapered bodies are usually made of metal able to withstand temperatures up to 450 ° C (840 ° F) and pressures of 100 bar (1,400 psi) approx.
