Vortex flow meters are flow sensors that detect the frequency of vortices shed by a bluff body placed in a flow stream. The frequency of the vortices is proportional to the flow velocity. Vortex flow meters are used to measure the flow of liquids and/or gases. Some devices can accommodate mixed-phase materials such as steam. Others can measure liquids with suspended solids (slurries). Operating pressure range and media temperature range are important media specifications to consider. Operating pressure range is the maximum head pressure of the process media that devices can withstand. Maximum temperature range is the maximum temperature of the media that can be monitored. Additional parameters include velocity flow rate, which is usually measured in distance/time. Vortex flow meters that can also measure temperature, density or media levels are commonly available.