Define Pulse Output Flow Meter and Explain its Types

flow meters- Define Pulse Output Flow Meter and Explain Its Types

Pulse output flow meter is prevalent in the flowmeter business, and we typically presume that our clients are also acquainted with them. It is necessary to be able to link to a system that can read the various pulse outputs to make use of them.

Pulse Output Flow Meter: Its Types

Sensors based on the Hall Effect

High-frequency operation is made possible by the Hall Effect sensor’s excellent long-term stability and life expectancy. When triggered by a magnetic field, they employ solid-state transistors that enable electricity to flow in one way. In terms of Hall Effect sensors, there are two varieties. Sensors each need a 5 – 24 Vdc power source, a resistor, and three wires (typically 10KOhm).
They function as “sinking” NPN or “sourcing” PNP devices. For an NPN “sinking” sensor, the positive power and pulse output wires must be connected to a “Pull up” resistor. When the NPN transistor is turned off, current flows to the pulse output wire via the resistor. The signal output value is reduced when NPN is triggered by a spinning turbine or gear’s magnet.

See More:- Top 6 High Accuracy Inline Water Flow Meter

Switches made of reeds

Like Hall Effect devices of water flow meter pulse output, Reed switches are triggered by a magnet passing across them. There are just two wires needed to connect and disengage an input/output connection using Reed switches, and they may use significantly less power than a Hall Effect sensor to function. This feature makes using battery units or working in hazardous (ATEX) conditions easier.
As mechanical devices, Reed Switches are less stable than Hall Effect sensors at high frequencies (up to 200Hz) and have a shorter operational lifetime. Because the Reed Switch contacts are prone to opening and shutting unpredictably, it’s essential to avoid counting several pulses each time the switch is opened or closed. Consequently, “debounced” reed inputs on flow meters are standard.

Infrared Detectors

In some instances, optical sensors of Pulse output flow meters are employed on turbine flow meters because of their ability to provide good low flow performance for applications involving transparent fluids. Titan’s infrared optical sensor systems are transistor-based and resemble Hall Effect NPN sinking devices in their design and functionality. The revolving turbine blade interrupts the light source’s output, causing the signals to go to the output to pulse. It is possible to utilize a lighter turbine since it does not need the attachment of magnets to trigger the pulse.

Also, You Can Read:- Water flow sensors for coolant flow meter

Infrared Devices

Ultrasonic flow meters are unique in that they do not need any moving elements to monitor flow. They cannot generate pulses because they lack a revolving or repeating aspect. To determine the flow, an algorithm generates a number that accurately reflects the current state of the flow. An NPN or PNP output is generated from this number, which is used to synthesize a pulse output (square wave) depending on a parameter (typically represented as “pulses per unit” or something similar and generally controlled by the user).

To Sum It Up

Water meter pulse output users, on the other hand, often need integration with their existing control systems. Recently, we’ve had requests to link to Arduino or other electrical interfaces as well. A PLC device as usual. Sensors and other components might be destroyed if you don’t know what you’re doing. We hope this article will benefit you and you will consider the above-written types for a better outcome.

Here are a few more topics that you shouldn’t miss:
Smart Measurement Liquid Flow Meter for Your Business
Find the Right Water Flow Measurement Device

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