What is the best way to tell when you have a gas leakage in your house? Your nose. Your gas company puts in a rotten egg odor in your gas to be able to warn you whenever it leaks. You may also tell should you have one if you hear a hissing noise, see dirt appearing out of the ground (because of damaged gas line), or see a broken connection from an appliance, that used natural gas, for instance a BBQ grill. Sometimes, however, the leak isn't detectable. It could be released in too small of quantities or the homeowner's sense of smell may not be that great.
These problems are solved with the purchase of a gas leak detector. Generally, the more costly a gas leakage detector is, the better sensitivity setting it has. In other words, you are less inclined to get false alarms with a far more expensive and an improved quality gas leakage detector. You can buy one from stores such as the Home Depot or Lowes or, needless to say, online.
https://penzu.com/p/3d3cceba can do is give you a warning that there is a leak in your house. Once you know the overall section of the leak (a faulty connection on the BBQ grill for instance), put a soap and water mixture onto the area. Wherever you can find bubbles, there's gas. If Gas Leak Detector are coming from a metal connection, whatever you might need to do is do a little tightening. If it is coming from the center of a tube, for example, you're going to have to replace the tube.