EWN-R series metering pumps
Universal power supply, high speed operation (360 spm), integrated digital control module for proportional analog input control, pulse/ count control with multiply/ divide functionality Weatherproof. On-off control. Analog/ digital control. Pulse and count control. Pulse signal, (e.g. water meter) can be divided or multiplied to give less, or more chemical shots per pulse. High resolution with manually adjustable stroke rate (1 spm resolution) plus length for finer control. Pump head options: 1. High compression for gaseous liquid transfer, (e.g. sodium hypochlorite). 2. High pressure for power injection, (e.g. boiler treatments). 3. High viscosity for viscous liquid transfer, (e.g. polymer liquids). Optional auto air vent (AAV) to help prevent outgassing, (e.g. sodium hypochlorite). Standard display dose rates: spm, litres/hr or gallons/hr.

1. Manual mode
Stroke rate can be increased or decreased by 1 spm anywhere within the range 0 to 360 spm and can be changed either before or during operation.
2. Proportional control mode
The stroke rate can be proportionally controlled based on external DC 0-20mA signals. Select an input signal by means of the keys.
3. Pulse control mode
The EHE pump performs division control operations in response to external pulse signals. The pump provides one shot per (n) times pulse inputs. Set the number (n) between 1 and 999 by means of the keys.
Pulse-control
4. Count-control mode
The Iwaki EHE pump performs count-control operations in response to external pulse signals. The pump provides (n) times shots per pulse input. Set the number (n) between 1 and 999 by means of the keys. If the next pulse is received before a set number of shots have been completed, the pump is capable of storing that pulse signal (max. 255 pulses). The pump can be programmed to store the pulse input or not.
count-control
Pump specifications
Ewn-r-spec720
Control module specifications
Ewn-r-controls720
Pump head options
Ewn-r-types-720
Pumps available with high compression heads + specifications
Ewn-r-hc-spec720
Pumps available with high pressure head + specifications
Ewn-r-hp-spec600
Pumps available with high viscosity head + specifications
Ewn-r-V-spec400
Note 1: Each discharge capacity shown in the three tables above is at discharge pressure (stroke length 100%, stroke rate 100%) and increases as a discharge pressure reduces.
Note 2: The performance is based on pumping clean water at ambient temperature at rated voltage.

Pump head material options
Iwaki pumps with different head materials
In addition to the standard PVC pump head, there are also GFRPP, PVDF and SUS316 versions available.