DME

The electronically controlled variable-speed motor of the DME pump provides optimum control of the stroke speed. As shown in the figure below, the duration of each suction stroke is constant while the duration of each discharge stroke varies according to the capacity set, resulting in optimum discharge flow in any operating situation

The advantages:
• The pump always operates at full stroke length, irrespective of the capacity set; this ensures optimum accuracy, priming and suction.
• A capacity range of 1:800 for each pump size.
• Smooth and constant dosing ensuring an optimum mixing ratio at the injection point.
• Significant reduction of pressure surges preventing mechanical stress on diaphragm, hoses, pipes, connections and other dosing parts exposed to leakage and wear.
• The installation is less affected by long inlet and outlet lines.
• Easier dosing of highly viscous and gas-containing liquids.

Digital Dosing represents state-of-the-art technology. This patented Grundfos solution sets new standards, including new principles and methods.

Precise and easy setting

The operator can easily install and set the pump to dose exactly the quantity of dosing medium required in the application. In the display, the setting of the pump is read out directly in ml/h or l/h, pulse or batch, and the operation mode is easily identified by means of icons.

Unique technology

A unique drive and microprocessor control ensure that the medium is dosed precisely and with low pulsation even if the pump is operating with high-viscosity or degassing media. Instead of the conventional stroke length adjustment, the capacity of the DME is regulated by automatic adjustment of the motor speed during the discharge stroke and by fixed suction stroke speed, ensuring optimal and uniform mixing.

Fewer variants to cover all needs

DME pumps feature a powerful variable-speed motor, a turn-down ratio of 1:800 and a complete control interface including:
• Full pulse control
• Pulse-based batch control
• Internal timer-based batch control
• Analog 0/4-20 mA control
• Level control
• Fieldbus communication module.
This ensures that the DME pumps cover the range from 375 to 940 litres per hour up to 10 bar. The switch mode power supply ensures that the same pump is working precisely, irrespective of the mains supply (100-240 V, 50/60 Hz).

The DME dosing pumps feature diaphragm dosing head with integrated vent valve, ball valves at the inlet and outlet. The pumps are fitted with power cable and plug.