An easy-to-read large LCD counter, IC-cards to identify the specific model, change parameters, and maintain data loggings are main features which the advanced flow computer EL4000 series offer. Housed in a small, lightweight cabinet, it processes information monitored on-line and furnishes corresponding remote outputs: accepts information from the flowmeter, densitometer, thermometer, and pressure gage, and processes these information into a measure of flow rate and density at the reference temperature and pressure in real-time.