Vasthi Single gas detector is a device which detects the presence of any gas within an area, usually as part of a safety system. This type of single gas detector equipment is used to detect a gas leak and interface with a control system so a process can be automatically shut down.Single gas detector can also sound an alarm to operators in the area where the leak is occurring, giving them the opportunity to leave the area. Single gas detector device is important owing to the fact that there are many gases that can be harmful to organic life, such as humans or animals.