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I need to monitor the signal from a liquid flow meter in a pc application. The documentation says that the output is pulse in a "digital open collector signal." It also specifies that a 820 ohm pull-up resister must be used. Distance will be about 20 feet. For this particular flow meter 215 pulses = 1 gallon of fluid dispensed.

I am looking for a converter, logger, or other device that will convert this information into something a pc can understand (like rs232 serial). Can someone please point me in the right direction?

Thanks

Most any "flow computer" can read this. So can many PLCs, but you may need a high frequency input card.

On an o-scope it looks more or less like a square wave (it may be a little raggedy looking).

This is a very standard output.

Kessler Ellis is one of the most common flow computer suppliers. There are lots of others.

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Check out the USB digital input module from Advantech. It takes DC digital inputs from 1.5V to 50V max.

Spec sheet even claims it's suitable for home projects.

http://taiwan.advantech.com.tw/unzipfunc/Unzip/USB-4750_DS.pdf

Hi,

We have many signal converters, they are used in flow meters. Maybe can help you.

info at szsunyuan. com