Iwaki EFS Electromagnetic Flow Sensor

The Iwaki EFS series (EFS-05 and EFS-10) is an electromagnetic flow sensor mounted directly on the outlet of an Iwaki EWN-Y electromagnetic metering pump. It measures the flow the pump actually delivers, so the pump can run closed-loop (feedback) flow control, batch dosing and flow alarms. The measured value is shown digitally on the pump display. Mikron Proses (Üsküdar, Istanbul) supplies Iwaki pumps and flow sensors in Turkey, with installation and commissioning.

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The sensor is used with the Iwaki EWN-Y series metering pumps. For the wider range of Iwaki dosing pumps, see Iwaki chemical metering pumps.

Feedback flow control

Only the target flow rate is entered into the pump. With the feedback from the EFS, the pump continuously adjusts its stroke rate within 0 to 360 spm and keeps the target flow even when the counter-pressure changes. In batch mode, the pump stops when the set volume has been completed with the actual flow measured by the EFS.

Flow verification and alarms

The EFS confirms that flow is really taking place in the dosing line. It gives an alarm when the measurement goes out of range (FL.ER) or when the flow weakens (F.CHK). This is particularly relevant for chemicals such as sodium hypochlorite, which are prone to gas lock.

Operating conditions

The sensor works with liquids whose conductivity is at least 1000 mS/m; non-conductive liquids and foreign matter prevent measurement. It does not measure during the first 20 seconds after power-on, and a dry sensor needs about 30 minutes to become ready. The EFS-05 is used with the EWN-B11, B16, B21, C16 and C21 pumps, and the EFS-10 with the EWN-C31 and C36 pumps.

Sources: Iwaki EWN-Y datasheet (CAT-E 0055-03) and EWN-Y operation manual.