Iwaki EWN-Y Series Electromagnetic Metering Pump

The Iwaki EWN-Y series is an electromagnetic diaphragm metering pump for dosing applications that need precise, repeatable feed rates. The “Y” in the model code denotes the high functional controller of the EWN family. Combined with the optional EFS flow sensor, the pump measures the flow on each stroke and adjusts itself to hold the set dosing rate. Mikron Proses (Üsküdar, Istanbul) supplies Iwaki pumps in Turkey and provides application consulting on pump selection.

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The EWN-Y shares its pump and drive platform with the EWN-R series. The flow sensor is described on the Iwaki EFS electromagnetic flow sensor page. For the wider range of Iwaki dosing pumps, see Iwaki chemical metering pumps.

Technical features and model family

The pump is built with a B (20 W) or C (24 W) drive unit and effective diaphragm sizes of 8-35 mm (codes 09, 11, 16, 21, 31 and 36). In the standard type, capacity rises from 38 mL/min (2.3 L/h) for the B11 to 420 mL/min (25.2 L/h) for the C36, and the rated discharge pressure ranges from 0.2 to 1.0 MPa (2-10 bar) by model. The stroke rate is adjustable from 1 to 360 strokes per minute in 1 spm steps and the stroke length from 40 to 100 % or 50 to 100 %. The pump head is selected to suit the chemical: PVC (VC/VH), GFRPP (PC/PH), PVDF (FC/TC) or SUS316 (SH).

Controller and feedback control

In addition to manual mode, EXT mode offers digital (divide/multiply), analog proportional (4-20 mA type, rigid or variable) and pulse proportional control. With the EFS flow sensor, the pump takes the flow measured on each stroke as its reference for feedback control and for volumetric batch control. A required flow rate is simply entered into the pump, and the pump keeps adjusting its speed to hold that rate. The pump can also be connected directly to the Iwaki FCP or FCM flow counters, which monitor the number of shots and can detect gas lock. An optional auto degassing version with an automatic air vent valve (code A) is available for liquids that tend to gas.

Choosing the right pump requires the chemical, the required flow, the line pressure and the suction conditions to be reviewed together.