12
Overview
Introduction
Pump characteristics, features and part names are described
in this section.
Introduction
Pump structure & Operating principle
The EJ series is a diaphragm metering pump which consists of a pump head
and a drive unit with a built-in controller. A diaphragm is directly driven by elec-
tromagnetic force.
Principle of operation
The pulse signal via the PCB generates the electromagnetic force to make
reciprocating motion with the assistance of the spring force. The reciprocating
motion is transferred to a diaphragm through a plunger and then volumetric
change occurs in the pump head. This action transfers liquid along with pump
head valve action.
Control unit
Pump head
Pump head valve
Diaphragm
OUT
IN
Spring
Pump head valve
Plunger
