Iwaki EH-E Series Electromagnetic Metering Pump

The Iwaki EH-E series is an electromagnetic diaphragm metering pump that combines pump technology with electronic control. Four body sizes (E31, E36, E46, E56) cover 20.4 to 75 L/h (340-1250 mL/min). The integrated microcomputer controller lets a single pump run in manual, proportional, count and pulse modes. The body has a water- and dust-proof structure rated IP65. Mikron Proses (Üsküdar, Istanbul) supplies Iwaki pumps in Turkey and provides application consulting on pump selection.

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For the wider range of Iwaki dosing pumps, see Iwaki chemical metering pumps.

Models and wet end materials

The four models are named after the effective diaphragm diameter, and pressure capability falls as capacity rises: the E31 (30 mm diaphragm) works up to 1.0 MPa at 20.4 L/h, while the E56 (55 mm diaphragm) reaches 75 L/h at 0.2 MPa. The pump head can be selected from six wet end material types: PVC (VC), machined PVC (V6), a PVC variant specific to the E56 (VM), GFRPP (PC), SUS316 stainless steel (SH) and PVDF fluororesin (FC). Valve and valve seat materials depend on the selected code and include alumina ceramic, Hastelloy C276, SUS316, FKM, EPDM and PCTFE. The liquid temperature range depends on the material group: 0-40 °C for types VC, V6 and VM, and 0-60 °C for types PC, SH and FC.

Control modes

The E-type controller works in one of four modes. In manual mode the stroke rate is set with the keys in 1 spm steps. In proportional mode the stroke rate follows an external current signal (DC 4-20, 0-20, 20-4 or 20-0 mA). In count control (1:n) mode the pump makes (n) strokes for each pulse input, with n from 1 to 999 and a memory of up to 255 pulses. In pulse control (n:1) mode the pump makes one stroke for every (n) pulses, giving proportional feeding. The stroke length is adjustable from 20 to 100 %, which allows fine resolution over a wide flow range. The pump uses 48 W on average and accepts AC 100-240 V single-phase supplies at 50/60 Hz.

Choosing the right pump depends on the chemical, the flow rate, the line pressure and the suction conditions together.