This sensor keeps the propane solenoid/valve open. Of course if you can find where to shut it down, it will close the LP. The RV manufacturers purposely make it difficult, because they want it on line all the time to sniff out LP and CO as well. Its purpose is to alarm and also shut down the LP. I believe there is a light weight wire coming directly off the batteries with an inline fuse. That might be it. That is what bubbles also believes.
When I had the *problem with the sensor in the summer, it shut down my LP fridge while travelling. I pulled the sensor, removed the crimped connectors and installed wire-nuts. That way I could disconnect the sensor and connect the solenoid valves white wire to 12 volt to keep the fridge on.
This was an emergency temp. patch until I replaced the sensor.
*Although the sensor has a limited life, I shortened its life by spraying beer into it. It apparently didn't like my brand