Hello,

This is my first time posting to this forum, and I am new to PLCs and LOGO so apologize in advance for the lack of terminology.

I am trying to measure the flowrate using a Flow Sensor from Omega, after trying to use both the High Frequency inputs and the analog inputs I was not able to pickup the signal.

I called Omega and they said that the output voltage is too low to be picked up by the LOGO, so they are suggesting I get an amplifier to be able to see this signal.

My question to this forum is, what is the minimum Voltage that the LOGO will pick up? They said that the peak voltage of the signal on the sensor is 30 mV. 

From my previous circuits experience I always though I could use pulse wave modulation to convert the analog signal into a pulse but I was not able to get the block to work.

Thanks in advance for the help!

ixo65

So that the digital input of the LOGO! detected a signal as a 1-state, the voltage must be > 8.5 VDC. To detect 0-state, it must be < 5 VDC.
With a voltage of 30 mV, the LOGO! do not start anything.

 I looked for this information and could not find it anywhere. I ordered the amplifier and hopefully I will be able to pickup the signal then. Thank You!