What is pulse volume? ? ?
Thread Content
Most of what I see in the factory are switching and analog quantities, but in some flow measurement circuits, some input signal types are: pulse volume. Who can give a detailed explanation? ! ! :handshake
I have always thought that pulse signal is equivalent to pulse volume. I don’t know if this is correct, but I am confused as to what signal is pulse signal specifically. pulse signal: A voltage or current that changes suddenly and has a very short action time is called a pulse signal. It can be periodically repeated, non-periodic or single.
Generally, velocity and volumetric flowmeters will generate pulse signals. Taking a turbine flowmeter as an example, the generation and measurement of pulse volume are explained.: Working principle of turbine transmitter: When the fluid flows along the axis of the pipe and impacts the turbine blades, a force proportional to the product of flow rate qv, flow velocity V and fluid density ρ acts on the blades to push the turbine to rotate. As the turbine rotates, the blades periodically cut the lines of magnetic force generated by the electromagnet, changing the magnetic flux in the coil. According to the principle of electromagnetic induction, a pulsating potential signal will be induced in the coil, and the frequency of this pulsating signal is proportional to the flow rate of the fluid being measured, that is,: Among them, qv is the total volume of fluid, and N is the total number of pulsations generated by the transmitter. ； ξ is the flow coefficient. ξ is an important characteristic number of the turbine transmitter. Different instruments have different ξ, and it changes with the wear and tear of the instrument over time. ； Its meaning is the number of pulses output by the transmitter when the unit volume flow passes through the transmitter. The pulse signal output by the turbine transmitter is amplified by the pre-amplifier and sent to the display instrument, so that the flow rate can be measured. This post was last edited by emir001 on 2007-12-27 15:29 ]
The pulse amount is the frequency signal. One pulse per second is one Hertz. The current signal is obtained through f/i conversion based on the pulse signal.
The pulse amount is the frequency signal, and the system receives the switching signal, such as a flow meter. The measuring range is 0-50m3/h. You can define a pulse as 10m3, which means that when the cumulative flow reaches 10m3, it will send out a pulse signal. Then the total amount can be calculated in the system
The signal used to measure the speed of a compressor should be a pulse signal.
Pulse signal is also a type of signal transmission: It has the same status as 4-20mA, mV, switching value, etc. There are two types of pulse signal outputs for the flow meter:: Instantaneous flow pulse output and integrated pulse signal output. The instantaneous flow pulse output signal corresponds to the measurement range (the same as 4-20mA). The accumulated pulse signal is used by the calculator (usually panel mounted).