Oiltank ultrasonic sensor mount

thingiverse

I wanted to measure the level of my home heating oil tank with esphome.io and home assistant. Settled on a waterproof ultrasonic sensor with a single transducer as it fits nicely into the hole many oil tanks have to fit an Apollo Watchman or similar commercially available sensor. Sensor used: - https://www.amazon.co.uk/DollaTek-Waterproof-Ultrasonic-Measuring-Transducer/dp/B07PMGJ231?dchild=1&keywords=waterproof+ultrasonic+sensor&qid=1631399412&sr=8-5&linkCode=sl1&tag=woodwardwebcom&linkId=902bd192c1b2cde61cf918b5ff73501c&language=en_GB&ref_=as_li_ss_tl (UK) - https://www.amazon.co.uk/DollaTek-Waterproof-Ultrasonic-Measuring-Transducer/dp/B07PMGJ231?dchild=1&keywords=waterproof+ultrasonic+sensor&qid=1631399412&sr=8-5&linkCode=sl1&tag=woodwardwebcom&linkId=902bd192c1b2cde61cf918b5ff73501c&language=en_GB&ref_=as_li_ss_tl (US) Printed with raft and supports for the body as it ended up being a complex shape. Insert the sensor into the body and the screw the sensor onto the oiltank in the whole commonly already present for oil level sensors. The the top friction fits over the top of the sensor mount for a neat, showerproof finish. I then gave a quick spray with clearcoat to help make the case more UV resistant. You can seal with silicone or trim some rubber as a grommet if you want to ensure a leakproof seal. to the tank.