Analytical Instrumentation & Environmental Monitoring


Yokogawa's Flexible EXA series

April 2011 Analytical Instrumentation & Environmental Monitoring

FLXA21 modular 2-wire liquid analyser supports dual sensors.

Yokogawa has been offering its EXA200 series two-wire liquid analyser for processes since 1990. The FLXA21 is the first model of the modular Flexible EXA series to be introduced for continuous online quality control in river and tap water, waste water and power generation applications.

The new instrument is a modular 2-wire liquid analyser that supports the use of up to two sensors and can be flexibly configured to measure several different liquid properties including pH/ORP, contacting conductivity, inductive conductivity and dissolved oxygen. 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.

Features

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, it enables a reliable backup system that ensures uninterrupted measurement even during maintenance. System changeover can be accomplished quickly and easily by replacing or adding modules with users able to select from a choice of plastic or stainless steel case materials.

An interactive touch display provides on-screen guidance messages to make setup quick and easy. In the event of an error, the screen displays a code and indicates the corrective action to be taken. Several different display modes are available with prompts and other messages eliminating the need to consult the instruction manual.

Sensor self-diagnostic capabilities are provided via continuous measurement of sensor impedance, asymmetric potential and slope, as well as monitoring for electrode contamination, damage, burnout and decline in measurement accuracy. A display of sensor status includes the latest five calibration results along with an estimate of any future maintenance and calibration times. Digital communications options include HART, Foundation Fieldbus and Profibus.



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