Portable ar ultrasonic flowmeter Tech-Rentals have recently added the FUJITSU PORTAFLOW to their inventory and it is now ... Liquids which are of uniform quality such as service water, sewerage, sea water and oil, in the temperature range -40 to +100 ... Instructions are entered into the unit by a 20 key keypad which also enables the readings to be manipulated and converted. ... The PORTAFLOW can be operated from an AC supply of 90 to 240 volts or a DC supply of 10 to 30 volts.