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Yokogawa has unveiled the FLXA21 liquid analyser designed for continuous on-line measurements of pH/ORP, inductive and contacting conductivity, and dissolved oxygen in industrial installations.

The instrument is a modular two-wire liquid analyser that supports the use of up to two sensors and can be flexibly configured to measure several different liquid properties.

The FLXA21 also incorporates a number of advanced features including a touch screen for ease of operation, sensor self-diagnostics, maintenance time estimation, 12 language display options, and a range of digital communications interfaces.

The ability of the FLXA21 to support up to two sensors of the same type helps to reduce installation and maintenance costs and save space, in addition to enabling the configuration of a highly reliable back-up system with interruption-free measurement assured even during maintenance.

Yokogawa said the modular design of the FLXA21 offers a high degree of scalability and enables the construction of a variety of systems.

System changeover can be accomplished quickly and easily by replacing and adding modules, and users can select the case material (plastic or stainless steel).

The interactive touch display provides on-screen guidance messages to make set-up quick and easy.

In the event of an error, the screen displays an error code and indicates the corrective action to be taken.

Several different display modes are available, and prompts and other messages eliminate the need to consult the instruction manual.

Sensor self-diagnostics capabilities are provided via continuous measurement of sensor impedance, asymmetric potential and slope, as well as continuous monitoring for electrode contamination, damage, burnout and decline in measurement liquid level.

A display of sensor status includes the latest five calibration results along with an estimate of the future maintenance and calibration times.

The FLXA21 can be used with a variety of pH/ORP, contacting conductivity, inductive conductivity, and dissolved oxygen sensors.

Digital communications options include Hart, Foundation fieldbus and Profibus.

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