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Questions tagged [flow-sensor]

Sensors which measure fluid flow.

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110 views

Does Hall flow sensor require an optocoupler when using STM32 MCU?

I'm using an STM32F103 to measure water flow through a pipe using Hall flow sensors. My power supply is 12V DC to 5V/3.3V DC. STM works with 3.3V and Hall sensors with 5V levels. I've configured the ...
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36 views

Counting pulses in low power device

I have a mechanical water flowmeter with reed switch output and I connect it to my low power, battery powered device to count pulses. The reed switch is connected to my device via a 15 m long cable ...
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3answers
75 views

Why is there a negative value on the scada when the analog input wire is disconnected from a field instrument?

I'm an apprentice electrician at an fmcg company. I've been seeing a trend recently, at the plant, where the scada actually reads a negative value instead of zero when a field device such as a ...
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2answers
141 views

Need help with a pulse/counter input circuit on hall effect flow sensor

I am having trouble wiring up a flow sensor to my pulse/encoder/counter card. I am using a hall effect flow sensor that works fine when wired to a digital counter display. However, when I try to ...
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0answers
76 views

Simplest/cheapest way to measure furnace gas usage?

I want to use an Arduino to datalog the gas usage of my furnace. This isn't really an arduino question though, its more related to finding the best sensor/electronics to interface with the furnace. I ...
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2answers
145 views

Amplifying signal with Darlington not working

I'm relatively new to electronics and this is not my usual field of work. For a bigger project I need to read a flow sensor's (Biotech FCH-C-PA-N) output. The output needs to be processed by an ...
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3answers
364 views

What does this resistor do in this RTD wheatstone bridge?

The question is in bold at the bottom, the following is background. I am going to measure air flow with a hot wire anemometer using the FS7 sensor from Innovative Sensor Technology (IST). They ...
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1answer
599 views

Hall Effect Flow sensor output characteristic [closed]

The cheap and convenient hall effect liquid flow sensors available for a few bucks online nearly all cite the device output as being a square pulse train whose frequency is a linear function of the ...
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1answer
840 views

Hall effect flow meter; measuring total volume

I'm playing with this Hall effect flow meter from Adafruit. In the description it states: By counting the pulses from the output of the sensor, you can easily track fluid movement: each pulse is ...
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1answer
326 views

measuring analog current output with beaglebone

I'm thinking about using a BeagleBone to measure the flow-rate of a fluid through a pipe. Here is a breakdown of the scenario: this flow sensor could be used from the doc, the output is a 4-20 mA ...
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1answer
213 views

Arduino UNO sensor works fine when connected to laptop but gives problem when connected to external power supply [closed]

I have encountered problem with Arduino UNO and water flow sensor. So here's situation: I have connected a 12 V power supply from DC battery and then used 5 V regulator which output is used as input ...
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1answer
1k views

Water flow sensor

I wanna use a water flow sensor to check the water flow in my laser cutter. I could find a lot of code for that but i can't understand the logic.I'm new to arduino. This is what I understand so far ...
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2answers
746 views

How can I convert a flow sensor's pwm output to logic level relay control?

I have a flow sensor with PWM output and I can't replace it with a flow switch due to mechanical restrictions. Is there any simple way to convert the PWM output to a logic / or analog signal and ...
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2answers
868 views

SSR with low-flow switch to control heater

I'm trying to install a low-flow switch (circuit is open below 0.1 gal/min, closed above that) as a safety measure on an immersion heater, but I have some questions about the setup I've come up with (...
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3answers
7k views

Ultrasonic Sensor to detect water flow

I am trying to build a small DIY kit that can detect water flow in a pipe using ultrasonic sensor. I have found Ultrasonic Distance Sensor but not Ultrasonic Flow Sensor. Would really appreciate any ...
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2answers
886 views

Miniature flow sensor for detecting breath movement

I've been looking around for a sensor that is capable of detecting the presence of a person's breath. It needs to fit inside a tube that a person will blow on. Detecting the force of the person's ...
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1answer
106 views

Eco-roof flow meter with “counter channel” output - what is that?

Some background: I'm working on an eco-roof flow monitoring project and we want to hook up a Unidata 6506G tipping bucket flow gauge (our effluent flow is in a strange low range range where we needed ...
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5answers
4k views

Measure Water Flow in a Swimming Pool

I've got an inground swimming pool, and was inspired by an ill-formed question that was recently posted. I would like to non-invasively measure the volume of water my pump is circulating through the ...