brunofunchas
Full Member level 3
Hi,
I have a printing machine, early 90’s, which has IR sensors on the input that detect the presence of paper. It has a LED and one phototransistor on the same package.
When I put paper over the sensor I still see 12V between the collector and emitter pins. Is it possible that the output of the sensor is in the form of current? Like a digital sensor that for "0" state will be 4mA and for "1" will be 20mA.
The signal 4-20mA is only use in analog sensors?
Does anybody have the typical output wave for the generally used sensors?
Regards,
Bruno
I have a printing machine, early 90’s, which has IR sensors on the input that detect the presence of paper. It has a LED and one phototransistor on the same package.
When I put paper over the sensor I still see 12V between the collector and emitter pins. Is it possible that the output of the sensor is in the form of current? Like a digital sensor that for "0" state will be 4mA and for "1" will be 20mA.
The signal 4-20mA is only use in analog sensors?
Does anybody have the typical output wave for the generally used sensors?
Regards,
Bruno