Have the gas company visit with an electronic sniffer.
There should be no leaks from the piping.

Some gas always escapes before ignition occurs when you turn on a burner, and sometimes excess oderant is added to gas and fails to be completley consumed in the flame.

You could also have a leaking valve in the stove itself.

The gas company is usually more than willing to test for leaks.
Gas explosions are really bad advertising.

I think brickeye may have very well pegged this one. Have the gas tech test the range itself for leaks with a manometer or w.c. pressure guage. The control valve or a fitting in the range could be leaking. This type of leak is not noticeable all the time, customers with this problem usually complain of occasional gas odor around the specific appliance. This type of leak is normally very small and is much easier found by testing the appliance itself, instead of the entire system.

No it is not "normal" for fittings to leak occasionally. In my experience fittings either leak or they don't. The same theory as above could hold true for fittings though and a gas sniffer is the best resource for finding small leaks in piping systems, however these small leaks will show up on guages if left long enough, say 10 minutes, identifing the fact that a leak exists. Since you say they tested the lines, this leaves the flex connector and the range itself.

Manometer's are useless for detecting minor leaks. Electronic sniffers and soap testing are the best system.
As a matter of fact if you think you could check your fittings just mix a small amount of dish soap and water and brush it on all the connections you see. If bubbles appear thats a leak.

Ps to identify leaks in my area the gas co shuts down all appliances that use gas and makes a mark on the meter face, they then watch the needle to see if it is still moving.

Yes, and that is a sufficient way of testing the piping system. The Op needs to have the range itself tested and a monometer or w.c. guage is the best way to quickly prove if it's gastite or not. If manometers and guages are useless for checking for leaks I guess they should stop making them since thats partly what they are made for. Bubble soap on the other hand, while a great product, indeeed is useless for finding really small leaks cause it make take several minutes for a leak to show up. This is normally much longer than anyone will sit and stare at soap, thinking it will show immediately, they just say: no leak.

"The Op needs to have the range itself tested"
Please excuse my ignorance but how does one do that with a water column meter?

Easy.Cut gas cock off supplying range, Cut off every burner and every pilot(if applicable) then connect the manometer to the test port on the gas cock(if applicable), or one range top burner and open that burner valve, or any other test port available on the range(such as on the range regulator, sometimes/sometimes on the gas rail, etc.). Then cut gas on to range and back off again and watch the manometer/guage for drop. This will prove gas tite or leak. Honestly one can do this with the sniffer alone, but both sniffers and soap can miss small leaks sometimes, so I prefer to test the appliance first.

I get the same problem. I smell gas after the installation of the sniffer, i call to the company and they said that this is a minor leakage from the furnace.I get worried about the leakage and reinstall the sniffer and maintain gas pipe.
https://www.aesolutions.com.au/products/gas-detection-systems.php

Lucy Gray is a spammer.