The Hedland EZ-View Liquid Flow Meters is a variable area flow meter constructed of high-impact polysulfone plastic to provide a low cost alternative for your flow monitoring requirements. These simple but rugged flow meters contain a minimum number of moving parts offering reliable and trouble-free flow measurement. They can be used in applications in which the temperature ranges from 32°F to 250°F (0°C to 121°C) and are pressure rated for 325 psi/22.4 bar maximum .

Hedland EZ-View Flow Meters for Oil and Water can be used for the flow measurement of oil or water. Five port sizes are available between 1½ to 2 inches with brass or PVC fittings. Six port sizes are available between ½ to 1 inch with brass, PVC, or stainless steel fittings. Standard calibration is 0.876 specific gravity for oil and 1.0 specific gravity for water .

The operating principle uses a precision-molded, sharp-edged orifice forming an annular opening with the metering cone. Flow through the meter creates a pressure differential across the orifice, moving the piston against the spring in direct proportion to the rate of flow. The calibrated spring opposes flow in the forward direction, decreasing viscosity sensitivity and allowing the flow meters to be used in any position, including inverted. The indicated flow rate is measured by viewing the red indicator line on the piston relative to the pre-calibrated numerical scale, mounted on the outer surface of the transparent body .

Features include no special piping or flow straighteners needed, easy installation in any position, no electrical connections, direct reading indication, and relative insensitivity to shock and vibration. Applications include water cooling systems, chemical and water systems, and reverse osmosis systems .