The Sigma 950 is an area velocity flow meter designed for industrial monitoring applications. The 950 employs acoustic Doppler technology to measure velocity in a flow stream as well as a pressure transducer to calculate level.
You can program the 950 to take log data readings at intervals of between 1 and 60 minutes, depending on your requirements. The standard system memory will store up to 17,280 readings before a data download is required (mention upgrade). The 950 also features RS232 and 4-20mA outputs for integration with water samplers and data acquisition systems.