EW: Water flow measurement kit runs for 35 years

Renesas Electronics has introduced a rotational flow demonstration kit for its RL78/I1D microcontroller that is designed to detect and measure the flow of water or gas in metering applications.

The flow measurement system is designed to run for 35 years powered by a 2600mAh battery, says the supplier.

REN0674 Flow_Meter

REN0674 flow meter

The rotational flow demonstration kit detects the rotational position using the MCU’s on board data transfer controller function, a form of state machine, while the MCU’s core is in stop-mode state.

This keeps average power consumption as low as possible, with average current at 4.5μA and a 32 sample burst per second.

The kit, which uses a simple electric motor to drive a metalised wheel to simulate the flow, senses the flow direction and volumetric flow rate of water and gas, and can also detect reverse flow.

The demonstration kit is applied using an active inductive method. Two coils are used to sense the rotational position of a part-metalised disk, and a third coil is used to generate a reference signal.

An optical sensor is included to determine the exact RPM of the disk.


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