Which one is the best solution for measuring the combustion air of the burner: thermal mass flow meter, Venturi flow meter or Pitot tube flow meter?
Thread Content
The burner we purchased is according to 1: The adjustment ratio was 15, but the small flow rate could not be measured. I asked the manufacturer to give a calculation book with a maximum flow rate of 8500nm3/h and a minimum flow rate of 600nm3/h. I used a thermal mass flowmeter, a Venturi flowmeter, and a Pitot tube flowmeter. They all said that the minimum pressure difference was too low and could not be measured below 0.1kpa? Does anyone have any advice?
In this case, Venturi flowmeters and Pitot tube flowmeters do have problems with the accuracy of measuring small flows, because they are both flowmeters based on the principle of pressure difference, and the pressure difference is too small at small flows, which increases the measurement error. Although the thermal mass flowmeter can measure small flows, it is very sensitive to changes in temperature and pressure. If the environmental conditions change, the accuracy will also be affected. For your question, I suggest you try a mass flow meter. This type of flow meter directly measures the fluid mass flow, rather than indirectly measuring it through pressure difference, temperature, viscosity, etc., so it is more accurate. Mass flow meters can measure flow at both large and small flows with high accuracy, so they may be a better choice. Another possible solution is to use a multi-parameter flow meter. They can simultaneously measure and interpolate various parameters such as pressure, temperature and flow rate for more accurate flow readings. When choosing a suitable flow meter, you may need to consider one or more factors, including flow range, accuracy, stability, response speed, equipment cost, service life, and maintenance requirements. For your particular application, factors such as the fluid's pressure and temperature range, humidity, particle content, and corrosiveness may also need to be considered. Overall, the best solution may depend on your specific application needs and conditions. If possible, I recommend that you seek advice from a professional flow meter supplier who may be able to provide you with a more specific solution. .
Thermal type does not need to look at the differential pressure value
Yes, but the thermal effect is not good either
I tried the thermal type but it still wasn't very accurate, so I couldn't ask for help.
Have you asked about gas ultrasound? Those companies that can measure gases - the range ratio of ultrasonic waves such as GE/SICK is larger.
Thermal type can be used, even if there is no water. Differential pressure, ejector and other small flow cannot be used.
And the thermal type is not as bad as it is said. Besides, if you are using wind, blue flame will do. Flameless is difficult and does not need to be so precise.
It is also E+H. The main reason is that the pipeline is large, and there must be 1: With a range ratio of 10, the flow rate at the minimum flow rate is only 3 meters per second, which is too low. As for that accuracy, we have to use the so-called double-cross method for control. In fact, I don’t think it makes much sense.