Question on gas alarm

Interesting question. From an article on gas alarms:

“If you buy a residential gas detector system, make sure you get the right one, O'Shea said. Natural gas customers should purchase a detector that can sense methane gas, while propane customers should purchase a propane detector.”

So it would appear that a propane detector such as we have in our RVs would not detect methane, which is a component of sewer gas.

Dave