Does the product provide continuous liquid level data?

According to the documentation, the device switches state when it detects liquid and then back when the liquid is gone. This is not a pulse, it is a continuous level on the yellow wire, either high or low when liquid is present, depending on how you connected the black wire.

would attaching this to the underside of a sloped horizontal pipe detect the presence of water flowing in the pipe as a non-contact flow sensor?

From my limited testing of this sensor, I would say it would if the pipe were thin enough and the liquid filled the pipe. However, only testing will tell you for sure.

I do not measure any changes in voltage in the yellow line with or without liquid present. led works as expected. what should happen?

Connect Black wire to nothing, Brown to +24V, Blue to 0V (Negative), Yellow to (-) side of load (100mA or less). Connect (+) side of load to +24V. Strap sensor to empty plastic pipe. Turn sensitivity screw CCW until red light ON. Then slowly CW until OFF. (keep hands away while adjusting). Now that sensitivity is at edge of sensing, bring your hand toward sensor (light turns on). Move hand away (light turns off). Put water in pipe (light turns on).

Manufacturer	Taidacent
Part Number	DJL-Y26-NPN
Item Weight	0.81 ounces
Package Dimensions	3.4 x 2.1 x 0.5 inches
Item model number	Y26-NPN
Is Discontinued By Manufacturer	No
Material	plastic
Measurement System	Metric
Batteries Included?	No
Batteries Required?	No

Taidacent Non Contact Fuel Level Sensor capacitive Sensor Pipe Water Level Sensor Float Switch Water Level Switch NPN Output

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