Pump Technology Newsletter Signup
Get the Engineering360
Stay up to date on:
Hydraulic and pneumatic pump construction, performance (controls and operation), and application notes from the field.

High perfomance chemical feed metering pump

Product Announcement from Iwaki America and Walchem, IWAKI America Inc

The EW Series is the flagship of the E-Class with capacities up to 6.7 GPH (25.4 l/h) and a maximum pressure of 250 PSI (17 bar). Compact, powerful and packed with a variety of innovative design features the EW can enhance any feed application.

IP65 Construction
The rugged Polyphenylene Oxide (PPO) enclosure is equipped with a durable clear cover to protect the membrane switches and stroke control of the pump, which are mounted opposite the liquid end. The display utilizes a high temperature LCD that provides extra protection from sunlight in outdoor applications.

Control Features:

· Feed Accuracy -Powered by the E-Class 360 Stroke-Per-Minute technology the EW has an incredible adjustment range of 1800:1 ensuring precise feed control for any application.

· Analog Input Control - Fixed or scalable 4-20MA input control.

· Pulse Input Control - Pulse input with multiply and divide features (1-9999). 12VDC output power supply for Hall Effect water meters.

· Stop Input Control - A stop input contact will stop pump operation and close the stop output relay contact for external control, alarm or remote notification. A red LED locally indicates a stopped condition.

· Pre-Stop Input - A pre-stop input contact will illuminate an orange LED, locally providing warning while pump continues to operate.

· Feed Verification - The EW is equipped with 3-preprogrammed modes for accepting our Posiflow Feed Verification Sensor. The Posiflow provides a pulse feedback to the pump to verify prime and proper feed. Depending on the mode, the user can program to pump to stop, continue operating and/or send an alarm based on the Posiflow input.

· Outputs - A stop condition and synchronous pulse outputs are standard outputs, however the output relays can be programmed to signal any pump condition.

Easy Draw-Down Calibration - In the calibration mode the user only needs to start and stop the pump, enter the draw-down volume and the pump calibrates volume-per-stroke.

Introducing The EFS Sensor

Changing conditions needn't mean a drop in chemical dosing accuracy, thanks to EWN-Y series metering pumps with the NEW rapid response EFS sensor option. EFS technology continuously relays the true flow rate to the EWN-Y's digital controller. The result is "set it and forget it" reliability, plus extra performance benefits:

• Simple setpoint control, with a clear display of actual dosing flow rate

• No time-consuming calibration required

• 360 strokes-per-minute pump output for high resolution chemical feed with greater adjustment accuracy

• 4-20 mA control output proportional to actual pump flow rate

• Optional Auto-air Vent Valve eliminates gas-lock problems with continuous venting.

When outgassing, back pressure or viscosity variations threaten, Iwaki technology makes sure your water treatment system is instantly ready to go with the flow.

Contact us today!