Flylin 5 PSI Pressure Transducer Sender Sensor with Connector 1/8" NPT

I used this with an Arduino. There's a bit of bounce in the readings, but it's reading reliably and working well.

I want to measure the pressure on my hydroponics pump which puts out about 3PSI. I ordered one and it worked fine, I ordered a second to expand my project. The second one did not work. They seem to be made well but given my experiance I would not recomend ordering this product. Documents: the pinout on the website inticates pins 1,2,3 but the connector is labled A, B , C.

Accuracy is a bit off on the low end of the spectrum and requires polynomial calibration against a manual source, but once done it's been working great for at least a few months so far. As long as it holds out a great deal for an inexpensive low pressure transducer for home automation projects

I want this product to work, and it tries to, but… at no pressure it has a low reading, at low pressure it has a high reading, then the voltage drops as the pressure rises. So it’s really only useful for telling whether there is pressure in the system but not how much pressure. Strange.

No good only last a month then started giving problems

I ordered two of these to track the fill level in a water tank, I ordered two specifically due to the mixed reliability on these sensors. The first one arrived in good condition and is currently working, the second one arrived with a damaged clip and lasted about 12 hours before displaying incorrect pressure information (pressure should have been 1.7 psi per my gauge and the other sensor, but was instead reporting 4.3-4.8psi). They're cheap, and I was able to dial in the accuracy very easily. Once I got everything set up with the arduino I had a good 12 hours of bliss where both sensors were within less than 2% of each other. I can't make any claim to exactly how accurate they are to the pressure gauge since its only graduated in 0.1 psi increments, but eyeballing it they were very close.

I connected the sensor up to power, and instead of putting out the expected 0.5V, it's putting out 4.27V, and it's only atmospheric pressure on the sensor. I looked inside of the orifice, and there was some kind of red liquid (see pictures). I left it lying upright overnight and thought that I might try to clean it out, and in the morning, the liquid was gone, but the sensor is still reading high. ***Edit: I was able to get the sensor reading more or less accurately, though I am still not sure what I did to get it working (I am still not sure what the red liquid was though). However, the readings are inconsistent, so I am looking into potential issues with my power source from buck converters as well as putting in noise filters for the power to the sensor and on the signal wire. If I can get it working better, I will update accordingly. This is the first time that I have been able to use this sensor. Unfortunately, I can't return the unit through Amazon. I bought it a few months ago, but my project has proven to be a lot more complicated than expected and I am past the 30-day window. (I'm trying to read this sensor on an Arduino and power it off a 5V power supply, but I tested the output with a multimeter.)