1. Wireless communication module controls the valve's closing.
2. Communication distance is around 2KM around the LoRaWAN gateway.
3. If the concentration of propane gas meter is detected to exceed set value, start to close the valve.
Valve Linkage Control:
1. Add a LoRaWAN wireless receiving controller to the gas meter and use a single chip microcomputer to control the valve.
2. Add a LoRaWAN wireless transmitter to the leak detector and use a single chip microcomputer for controlling.