5X00119G01 Limitations of electromagnetic flowmeters
5X00119G01 Electromagnetic flowmeter is an induction meter used to measure the volume flow of conductive medium in the tube, and has the advantages of minimal pressure loss, large measurable flow range, wide industrial pipe diameter range, and high accuracy, but the corresponding electromagnetic flowmeter also has the following limitations in the measurement. From China Sensor Trading Network
1, 5X00119G01 working temperature and working pressure
The maximum operating temperature of the electromagnetic flowmeter depends on the temperature of expansion, deformation and qualitative change of the material of the pipeline and lining, which varies according to the specific instrument and is generally lower than 120’C. The maximum working pressure depends on the strength of the pipe, the sealing condition of the electrode part and the specification of the flange, generally 1.6X105-2.5X105Pa, because the wall is too thick will increase the eddy current loss, so the side measurement pipe is thinner.
2, the conductivity of the measured flow
The medium to be measured must have certain conductive properties. Generally, the conductivity is required to be 10-4-10-1s /cm, the minimum is not less than 50 5S/cm, therefore, the intelligent electromagnetic flowmeter can not measure the flow of non-conductive fluids such as gas, steam and petroleum products.
For conductive media, in theory, all relative to the magnetic field flow, will produce induced potential, in fact, the increase in the internal resistance between the electrodes, by the transmission line distribution capacitance, amplifier impedance and measurement accuracy limits.
5X00119G01 Analog output vs Digital output:
This is the first thing to consider. It depends on the interface between your system and the acceleration sensors. Generally, the analog output voltage and acceleration are proportional, such as 2.5V corresponding to 0g acceleration, 2.6V corresponding to 0.5g acceleration. Digital outputs generally use pulse width modulation (PWM) signals.
5X00119G01 If you are using a microcontroller with only digital inputs, such as BASICStamp, then you can only choose a digital output acceleration sensor, but the problem is that you have to take up an extra clock unit to process PWM signals, and it is not a small burden on the processor.
If you are using a microcontroller with an analog input, such as PIC/AVR/OOPIC, you can easily use the analog interface acceleration sensor by adding a command like “acceleration=read_adc()” to the program and processing this command in a few microseconds.
Measure the number of shafts:
For most projects, two-axis acceleration sensors are already sufficient for most applications. For some special applications, such as UAV, ROV control, a three-axis acceleration sensor may be suitable.
Maximum measured value: