The Viking Waterflow Indicator is a vane-type waterflow switch designed to detect a sustained flow of water in a wet pipe system. A built-in adjustable pneumatic retard device delays actuation of the electrical switches to reduce the possibility of false alarms. The Waterflow Indicator is used to operate local alarms, indicate signals to annunciator panels, or perform other functions that can be initiated or controlled by the opening or closing of an electrical switch. The Viking Corp.