Iwaki EWP Series Electromagnetic Metering Pump

The Iwaki EWP series is an electromagnetic metering pump with two controller options: the full-function EWP-R and the simple-function EWP-L. It delivers 38-420 mL/min at up to 1.0 MPa in a housing rated IP66, and its mounting footprint matches Iwaki EHN, EJ, ES, EZ and EWN pumps, so it can replace them without changes to the installation. Mikron Proses (Üsküdar, Istanbul) supplies Iwaki pumps in Turkey and provides application consulting on pump selection.

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The EWP is related to the EWN-R and EWN-Y series. For the wider range of Iwaki dosing pumps, see Iwaki chemical metering pumps.

Controllers and control modes

The EWP-R has advanced control functions: analog and pulse inputs, batch operation, interlock and data logging. A backlit LCD and a multicolor status LED bar make the operating condition visible from a distance. It offers seven EXT control modes in two signal families. The three proportional (analog) modes are ANA.P (analog preset: 4-20, 0-20, 20-4 or 20-0 mA in proportion to the stroke rate), ANA.V (analog variable) and PLS.V (pulse variable). The four pulse modes are DIV (divide), MULTI (multiply), BATCH and INT.B (interval batch), which synchronize the pump with a signal from an external device such as a paddlewheel flow meter. STOP, Pre-STOP and Interlock functions provide process safety, and an output can signal the pump status to a higher-level automation system. The EWP-L has simple stroke rate and stroke length adjustment knobs, with external analog or pulse control as standard.

Housing and installation

The housing is designed to IP66 (water- and dust-proof). An easy-to-install mounting base also allows wall mounting without tools, except for the heavy SH type. Compared with the EWN series, the EWP takes up about 22 % less volume, and its power consumption is about 35 % lower than that of an EWN-B11 pump.

The wet end can be PVC, GFRPP, PVDF or SUS316 stainless steel; valve, valve seat and O-ring materials include alumina ceramic, EPDM, FKM, PCTFE and Hastelloy C-276 equivalent, chosen to suit the chemical. The model code also defines the capacity: 038B (38 mL/min) and 080C (80 mL/min) use the 13 W drive unit; 130D (130 mL/min), 270E (270 mL/min), 410F (410 mL/min, TC, FC and SH heads only) and 420F (420 mL/min, PVC and GFRPP heads) use the 23 W drive unit.