The Kobold DON-H series oval gear flow meter offers reliable flow rate measurement for demanding process conditions. The DON-H is suitable for clean, high and low viscosity liquids such as lubricating/hydraulic oils, petroleum, grease, diesel fuels, chemicals, solvents, resins and pastes and uses two precision-machined oval gears which allow a very specific volume of liquid to pass through the meter with each rotation, providing a true volumetric flow measurement.

These gears enable the DON-H to precisely measure liquid flow over a very wide viscosity range, accommodate fluctuating flow rates, and provide accuracy for applications with intermittent flow. Flow ranges cover 0.13-9.5 GPH to 0.26-10.6 GPM with maximum pressure of 5800 psi and temperature up to 250°F. Accuracy is ±0.2 to 1% depending on configuration.

The stainless steel construction ensures durability in harsh environments. Media with particulate matter is not suitable for use with the DON-H due to the mechanical nature of the measurement principle. Higher viscosities are available with special cut rotors.