The GRUNDFOS DME 12 6AR PP E C F 3111F is a compact, motor-driven digital diaphragm dosing pump. It is designed for the precise, reliable, and safe injection of chemical liquids into water or other process fluids. The “E” in its name is crucial, as it signifies that this is an explosion-proof model, certified for use in hazardous areas where flammable gases or vapors may be present.
Detailed Model Number Breakdown (DME 12 6AR PP E C F 3111F)
Grundfos model numbers are a code that specifies the pump’s exact configuration. Here’s what each part means:
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DME: The product series. This stands for Digital Metering Explosion-proof. It indicates a microprocessor-controlled dosing pump.
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12: Maximum Flow Rate. This pump has a maximum capacity of 12 liters per hour (L/h) at a 50 Hz power supply.
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6: Maximum Pressure. This pump can generate a maximum discharge pressure of 6 bar (approximately 87 psi).
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AR: Pump Head Type. “AR” designates a hydraulically actuated diaphragm with a built-in pressure relief valve. This design is highly accurate, self-priming, and protects the pump from damage due to over-pressure.
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PP: Pump Head Material. The wetted parts of the pump head (in contact with the chemical) are made of Polypropylene. This offers good chemical resistance for a wide range of acids, alkalis, and other aggressive fluids.
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E: Motor Version. This is the key identifier for Explosion-proof construction. It is built to specific international standards (like ATEX) to prevent ignition in hazardous environments.
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C: Power Supply. This denotes a standard voltage range, typically 1x230V AC, 50/60 Hz.
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F: Control Type. “F” signifies that the pump is equipped with a frequency (speed) control input (e.g., 0/4-20 mA, 0-10 V, or pulse signals). This allows for proportional dosing based on an external process signal.
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3111F: This is a variant/modification code used by Grundfos for specific factory configurations or special features that may not be standard for that base model.
Additional Identifiers
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MOD C96434887P107330165: This is the Manufacturing Module Code. It’s a unique serial number used by Grundfos for internal production tracking and traceability.
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DIGITAL DIAPHRAGM PUMP: Confirms the operational principle—a digitally controlled motor drives a hydraulic system that flexes a diaphragm to create the pumping action.
Key Features & Benefits
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High Dosing Accuracy: Digital control and hydraulic diaphragm actuation ensure precise and repeatable dosing, essential for effective chemical treatment and cost control.
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Explosion-Proof (ATEX Certified): The “E” motor is encapsulated and designed to prevent sparks, making it safe for use in Zone 1 and Zone 2 hazardous areas (e.g., petrochemical plants, paint shops, biogas facilities).
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External Control Capability: The “F” control allows the pump to be seamlessly integrated into automated systems. It can adjust its dosing rate in real-time based on a signal from a flow meter, pH controller, or PLC.
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Diaphragm Failure Detection: The pump features a sensor that monitors the integrity of the hydraulic system. If the diaphragm ruptures, the pump will stop and trigger an alarm, preventing chemical contamination or process failure.
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Corrosion Resistance: The Polypropylene (PP) pump head is resistant to a wide range of aggressive chemicals.
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Easy Maintenance: The modular design allows for easy replacement of the pump head, diaphragm, and valves with standard tools.
Typical Applications
This pump is used in industries where precise chemical dosing is required in potentially explosive atmospheres. Common applications include:
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Water & Wastewater Treatment: Dosing of flocculants, neutralization acids/alkalis, sodium hypochlorite (disinfection) in treatment plants.
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Chemical Processing: Precise addition of reagents, catalysts, or inhibitors in chemical production.
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Oil & Gas Industry: Injection of corrosion inhibitors, scale inhibitors, or methanol in upstream and midstream processes.
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Power Plants: Dosing of chemicals for boiler feed water treatment (e.g., phosphate, amine).
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HVAC Systems: Dosing of corrosion inhibitors or biocides into cooling towers and closed-loop systems.
