Admag AXR Measures Fluid Flow Of Chemicals

The Admag AXR from Yokagawa is suited to fluid-flow measurement in a variety of industries, including chemicals, iron and steel, and food and beverage. The two-wire magnetic flowmeter uses one pair of wires for current output and power supply, offering low installation costs by requiring neither a dedicated power supply cable nor a power-supply unit. Yokogawa's dual-frequency excitation technique minimises electric noise in two-wire models to a level comparable to that of four-wire magnetic flowmeters - achieving the high measurement accuracy and stability needed for use in control loops.

The method uses high-speed digital processing to execute the complex algorithms required to enhance stability and performance, while at the same time minimising power consumption. A further performance enhancement is provided by a new coil configuration. Because a two-wire magnetic flowmeter has a limited power-supply capability, the current supplied to the excitation coil is normally too weak for signals to be differentiated from electrical noise. To resolve this problem, Yokogawa has adopted a high-density coil-construction method that enables a stronger magnetic field to be generated with a low current. The company has also found ways to minimise the noise level by smoothing the inner surface of the measuring tube and developing an electrode that generates very little noise.

A full dot-matrix LCD display capable of displaying messages in six different languages enables magnet switches to be operated without opening the cover. The company has also added an electrode adhesion diagnosis function and a design change that allows the orientation of the converter to be changed on site. The elimination of the need for a dedicated power-supply unit and power-supply cable has allowed a reduction in instrumentation cost.

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