What Is a Mass Flow Meter?

The volume of a fluid is a function of the temperature and pressure of the fluid, and is a dependent variable, while the mass of the fluid is a quantity that does not change with changes in time, space temperature, and pressure. As mentioned earlier, among the commonly used flow meters, such as orifice flow meters, laminar flow meters, turbine flow meters, vortex flow meters, electromagnetic flow meters, rotor flow meters, ultrasonic flow meters, and oval gear flow meters, etc. The flow measurement is the volume flow of the fluid. The quantity of fluids involved in scientific research, production process control, quality management, economic accounting, and custody transfer is generally quality. Using the above flowmeter to measure only the volume flow of the fluid often cannot meet people's requirements, and usually it is necessary to find a way to obtain the mass flow of the fluid. In the past, the mass of a fluid could only be obtained indirectly by measuring parameters such as temperature, pressure, density, and volume of the fluid through correction, conversion, and compensation. This measurement method has many intermediate links, and it is difficult to ensure and improve the accuracy of mass flow measurement. With the development of modern science and technology, there have been some measurement methods and devices that directly measure mass flow, which has promoted the progress of flow measurement technology.

Mass flowmeter

Chinese name: Mass flowmeter
Foreign name: Mass flowmeter
Measurement principle: Laminar flow sensor

main feature: Suitable for multiple media
Classification: Direct indirect
The main parameters: Mass flow accuracy response speed

When a fluid flows in a rotating tube, it creates a force on the tube wall, which is

The mass flow meter uses thermal sensing to measure the flow rate based on the molecular mass carried away by the split molecules. Because it uses thermal sensing to measure, it will not affect the temperature,

Suitable for multiple media

2. High measurement accuracy

3. No straight pipe requirements

4. Good reliability

5. Low maintenance rate

6. With core processor

Mass flowmeters can be divided into two categories: one is direct, which directly outputs the mass flow; the other is

Mass flow meter hardware failure

If the error is too large, the totalizer display does not light up or add value, and the display is blank. The reasons are:

a. Irregular installation can directly lead to zero drift of the flowmeter. For example, if the mass flowmeter is installed near the pump outlet, the sensor support strength is insufficient, the connection flange is improperly welded to generate a stress signal, and the cable is subject to electromagnetic interference.

b. Wiring problems

If the display does not light up, check the power supply of the totalizer. If the fuse is burned, confirm that the input voltage is the nominal value of the standard voltage and whether the AC and DC forms are consistent. If the totalizer does not increase with the flow rate, check the wiring of the totalizer. If the totalizer is equipped with a forward / reverse program, check the wiring of the flowmeter, because the wiring of the flowmeter is incorrect, the totalizer will be reversed. Does not increment when flowing.

c. Process medium change

If the measurement medium is entrained, gasified, or two-phase flow, the transmitter will display an alarm display. When serious, the sensor stops working.

d. The transmitter fails.

e. Sensor failure.

f. Pipe purge issues.

Mass flow meter software problem

Mass flowmeter troubleshooting-For the flowmeter that has just been calibrated, be sure to pay attention to the zero calibration under the current operating conditions before installing and using it. You must ensure that the flowmeter is full of medium and the two ends of the shutoff valves must be closed before zero calibration. There are many methods, panel operation, hand-held communicator, and use of ProLink II software.

a. The zero calibration is incorrect.

b. The parameter setting is incorrect.

c. Power supply pulse fluctuation.

The di / o configuration is wrong (you must pay attention to the range).

e. Operation error