Questions tagged [flow-sensor]

Sensors which measure fluid flow.

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The object is to set off an alarm when the flow of water stops or drastically decreases using a Hall effect flow sensor

I have plumbed a flow sensor similar to this in the salt water line on my boat between the sea strainer and the suction pump for engine cooling over a 'salt to fresh water' heat exchanger. When the ...
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1answer
42 views

Replace magnetic sensor - help identify 3-pin IC marked “W10” and “1095”

We have an instant gas hot water system that is not initiating. I've traced it to the water flow sensor not signalling when water is flowing. After inspecting the housing, the magnet is spinning ...
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31 views

Ultrasonic dual transmitter-receiver circuit

I am building an ultrasonic flow sensor, based on piezoelectric actuators from cheap HR-SR04 modules. I need to measure the speed of sound back and forth. Schematic like this is good to send pulses: ...
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216 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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2answers
67 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
196 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
396 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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93 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
164 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
521 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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691 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
906 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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384 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
258 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
2k 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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799 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
1k 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
8k 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
977 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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6answers
5k 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 ...