Walchem Chemical Metering Pump Model: EWC31F1-VC, 4.3 GPH, 50 PSI, 115V (Discontinued)

The Walchem 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.