Can the Mopeka Bluetooth Propane Tank Check Sensor # MP34FR Be Installed on the Side of the Tank?  

Question:

Expert Reply:

Hi Doug,

The official Mopeka website says that the Mopeka Bluetooth Propane Tank Check Sensor part # MP34FR can only be installed on the bottom of the propane tank. It uses an ultrasonic sonar technology that sends a liquid up through the propane inside the tank, so it relies on direct contact with the bottom of the tank.

On another note, because you have a 100lb tank, this sensor is NOT compatible with this size tank. The Mopeka Bluetooth LP Tank Sensor part # MP34FR is designed for 20lb, 30lb, and 40lbs steel DOT propane tanks. If you try to use this sensor on your 100lb tank the sonar waves won't scale correctly to the tank's taller height and give inaccurate readings. Instead, you'll need the Mopeka Pro Check Propane Tank Sensors w/Collar part # MP77FR. It works with a sensor on the bottom and one around the middle to give accurate readings for larger tanks and is compatible with the free app or the Waltech Smart Thermostat part # WA74FR.

Are you planning on using this sensor for just one tank or do you need multiple?

expert reply by: Claire H

0

Doug H.

11/11/2026

I am planning on using it for one tank.

Claire H.

11/11/2026

@DougH Gotcha, if you ever do need to add more sensors you can still track all the sensors directly from the app.

Doug H.

11/11/2026

@ClaireH The Mopeka Pro Check Propane Tank Sensors w/Collar part # MP77FR is compatible with the Waltech Smart Thermostat part # WA74FR. But, the video also says that it can be used with the https://www.etrailer.com/Accessories-and-Parts/Mopeka/MP64FR.html Mopeka Propane Tank Monitor. Is this correct? The video mentioned that anything above 100# will show as full, but as the level goes below 100, it will show correctly or close to correctly, eg. 75%, 50%, 25%, Empty.