Near Intersection of I-35 & I-90 Southern Mn. | You said - i dont need a pullup resistor...i measured the sensor voltage into the flow meter input and it is switching +14' , 0 v. so i know the prox sensor is sending pulse to the module. this is very low frequency, like 1-2 Hz as it is off the apron chain, 1 bolt pass per revolution on the shaft. is there a hpf that limits this low freq pulse? not much info out there on the app rate module.
I believe your output is much, much too slow. I would suggest getting a different shaft sensor. As I recall some produce 180 or 360 pulses per revolution. If the shaft speed is relatively slow you use the 360 pulse model. If the shaft speed is faster you might need the 180 pulse model. Situations where the shaft runs "medium" speed might be able to use either style. These sensors appear identical from the outside and the only difference is the number of black/white pie shaped pieces on the internal disk.
These sensors have an internal disk that turns at the shaft speed. This disk consists of alternating black and white pie shaped sections. The "pie" is divided into 180 or 360 slices. As the disk turns the disk rotates in front of an optical sensor so the result is 180 pulses/revolution or 360 pulses per revolution. If the number of pulses/minute is too fast, the system can not "keep up" since the alternating black/white changes just become a blur. If the number of pulses/minute are too slow, the system is not able to indicate the speed of the shaft and ultimately the rate correctly.
I believe your sensor will be much too slow. You indicate that a pullup resistor is not necessary since you have determined that the output varies from 14V to 0v. That in itself seems good but really you don't know the shape of the output pulse. If observed on a 'scope the waveform needs to be fairly "square" and reasonably fast for this to work.
Measuring the output in a liquid system using a flow meter can be very accurate. Measuring the nutrient value of a dry product by measuring the speed of the apron is really just an educated guess since the product density, flowability, nutrient value etc. can vary considerably making accurate measurements difficult.
I will see if I can get some screen shots of the configuration setup procedure as time permits.
Edited by tedbear 4/3/2025 03:53
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AL- help, How do you setup app rate module with flow meter input
