The Walchem EW Pump Series is the flagship of the E-Class with capacities up to 6.7 GPH (25.4 l/h) and a maximum pressure of 150 PSI (10 bar). Compact, powerful and packed with a variety of innovative design features the Walchem EW pump 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 chemical metering pump, which are mounted opposite the liquid end. The display utilizes a high temperature LCD that provides extra protection from sunlight in outdoor applications.

Walchem Pump Control Features

• Feed Accuracy - Powered by the Walchem E-Class 360 Stroke-Per-Minute technology the Walchem EW Series Pump 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 Iwaki Walchem EW Pump is equipped with 3-preprogrammed modes for accepting our Walchem Posiflow Feed Verification Sensor. The Walchem Posiflow sensor provides a pulse feedback to the pump to verify prime and proper feed. Depending on the mode, the user can program the 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 Walchem EW pump, enter the draw-down volume and the pump calibrates volume-per-stroke.