Blue Double Ball Water Level Sensor Liquid Controller Vertical Float Switch

Blue Double Ball Water Level Sensor

I have installed the double level sensor, since I did not get technical specifications, I looked for similar sensors on the internet to get the value of voltage and current that it handles, for which I modified the original design using a control relay with a coil current of 80 mAmp and voltage 120 VAC; the system worked well in 2 operations and the lower sensor began not to open, so I dismantled the system and I refer you this observation. What can I do with the double level sensor? since it didn't work for me