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As a common output mode of vortex flowmeter, pulse output plays an important role in flow monitoring and control system.

Pulse output working principle

The pulse output function of the vortex flowmeter is realised based on its measuring principle. When the fluid flows through the vortex generator of the vortex flowmeter, it will produce regular vortices alternately on both sides of it, i.e. Kamen vortex. The frequency of the vortex is directly proportional to the fluid flow rate, and the flow rate can be calculated by detecting the vortex frequency.

Vortex flowmeters are usually equipped with piezoelectric or capacitive sensors to detect pressure fluctuations or vibration signals generated by the vortex. The sensor will detect the signal is converted into an electrical signal, after amplification, filtering, shaping and other processing, the output and vortex frequency consistent with the pulse signal. Each pulse represents a certain volume of fluid flowing through, and the cumulative flow rate can be obtained by calculating the number of pulses.

Advantageous features of pulse output

Strong anti-interference ability: Pulse signal is a kind of digital signal, compared with analogue signal, has stronger anti-electromagnetic interference ability, can effectively avoid the distortion and attenuation of the signal transmission process, to ensure the measurement accuracy.

Long Distance Transmission: Pulse signals can be transmitted over long distances via cables without significant signal degradation, making it easy for users to conduct remote monitoring and data acquisition.

Easy integration with control systems: The pulse output signal can be directly connected to counters, PLCs and other control devices, making it easy to totalise, display, control and alarm the flow rate.

Low cost: Compared with other types of output signals, pulse outputs are relatively inexpensive to implement, which helps to reduce the overall cost of the instrument.

Application Scenarios for Pulse Output

The pulse output function of vortex flowmeter is widely used in the following scenarios:

Flow measurement: for water, пара, gas, oil and other media flow measurement, such as water plants, heat companies, petrochemical and other industries.

Process control: used to control the flow of media in the pipeline, such as chemical production process of batching control, food and beverage industry filling control.

Energy management: Used to monitor and control energy consumption, such as water, electricity, gas and other energy measurement and management of enterprise energy management system.

Selection Precautions

The following factors need to be considered when selecting a vortex flowmeter with pulse output:

Pulse Equivalent: The volume of flow represented by each pulse, which needs to be selected according to the actual flow range and measurement accuracy requirements.

Output Frequency: the number of pulses output per unit time, which needs to be selected according to the sampling frequency and processing capability of the subsequent control system.

Output mode: including NPN, PNP, open collector, и т.н., need to be matched with the input interface of the control system.

Power supply voltage: need to be consistent with the power supply voltage of the control system.

The pulse output function of vortex flowmeter has the advantages of strong anti-interference ability, long transmission distance, easy integration, low cost and so on, which plays an important role in the field of flow measurement, process control, energy management and so on. When choosing vortex flowmeter with pulse output, users need to consider the pulse equivalent, output frequency, output mode, power supply voltage and other factors according to the actual application scenarios and needs to ensure that the instrument can work stably and reliably.