A solenoid metering pump is a positive displacement pump that uses a diaphragm and solenoid assembly to discharge fluid into a discharge line.

A solenoid "actuator" consists of a solenoid and spring assembly that can be activated/deactivated by a series of electrical pulses. When the solenoid is activated, the solenoid pushes on the diaphragm, expelling fluid. When the solenoid is deactivated, the spring mechanism returns the diaphragm, allowing more fluid from the suction line to enter the chamber ready for delivery.

The dosage aspect is determined by programming the pump to deliver at a certain rate. The rate can be set at will by the operator or based on an external signal, such as from a sensor probe that measures pH. The pump can then meter its fluid proportionally - in this case, it can meter caustic soda to the correct acidic effluent.

Some electromagnetic metering pumps also allow variable stroke length and stroke rate. This allows for very high "turndown ratios", i.e. very high ratios between maximum and minimum potential flow rates.

Electromagnetic metering pumps, or metering pumps, are commonly used in water treatment applications such as cooling towers, boilers, and industrial wastewater treatment; however, they are used in many different chemical processes around the world.

While there are many types of metering pumps, solenoid-driven positive displacement pumps are the first choice for chemical feed applications because of their low cost, ease of use, reliability, and accuracy.

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