Hello again all, I received help from this amazing community in developing a water sampler designed to collect a certain amount of liquid every 15 minutes and print out the running total volume on and LCD. This sampler worked great for the first few weeks, but over time the volume displayed on the…

[image] agz2007: I believe Why not go deeper and investigate things? Verify the theory the scientific way. Using weight measured by loadcells might be an alternative. Of course knowing the density of the fluid is needed.

Do you have a positive displacement pump? Does it run at an unvarying fixed speed?

[image] agz2007: using the known flow rate of the pump (400mL per minute How long ago did you calibrate the pump? If the sensor can get mucked up. the the pump can also get mucked up.

[image] agz2007: ...the flow sensor being used now as a simple switch to trigger detach the interrupt function to begin counting, and then attach the interrupt once there is no flow This may be easiest to fit to your existing code, but since the flow sensor is being used as a simple switch, y…

It sounds like are looking to move the problem rather than fix it. Using an ultrasonic sensor might be a better solution.

[image] agz2007: calculate volume using the known flow rate of the pump (400mL per minute) and millis to count mL per second, Sounds "iffy" to me unless you are using a calibrated pump which usually means expensive. One relatively inexpensive approach is using two (2) known-volume small rese…

There are alternative flow sensors one could use. As example, one straps onto the exterior of the pipe and I believe measures through ultrasonic which is non intrusive. The other which comes to memory is a pressure differential probe similar to the anubar system, but being sewerage it would be pro…

[image] Railroader: Of course knowing the density of the fluid is needed. excellent point, the point of the sample collection is to detects the concentration of viral RNA in wastewater, so that among other particulate matter in the water will change affect density and the time it takes for th…

[image] JCA34F: Do you have a positive displacement pump? Does it run at an unvarying fixed speed? technically yes, I'm using a peristaltic pump which is coded to pump liquid upwards from the sewer system, followed by a reversing state which clears the tubing of liquid after collection

I originally calibrated it on september 29th, the device has been getting field tested since then and I was informed a few hours ago that the tester reuploaded a sketch to it which may have had the wrong calibration factor because before, the volume reading was very low, but from the most recent rep…

Using time and know flowrate to get volume

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agz2007 November 10, 2022, 5:18am 12

what effect would this have? I remember someone mentioning that this could negate the millis rollover, is that what this change does?

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Using time and know flowrate to get volume

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