Zirconia analysers deliver high performance

Edited by the Electronicstalk editorial team Jun 14, 2001

The new EXAxt ZR Series of zirconia analysers from Yokogawa are designed for measuring oxygen content or high-temperature humidity in boilers, kilns, furnaces and process heating applications.

The new EXAxt ZR Series of zirconia analysers from Yokogawa are designed for measuring oxygen content or for making high-temperature humidity measurements in boilers, kilns, furnaces and process heating applications.

The new analysers are developed from Yokogawa's field-proven ZO21D zirconia probe technology, but feature a number of performance enhancements and design innovations that make them easy to use and cost-effective to operate and maintain in the most stringent of in situ measurement environments.

New features include an interactive touch-screen display, the ability to measure three separate parameters simultaneously, built-in HART communications, and a modular design which makes installation and maintenance very simple.

The new range includes two models.

The ZR402 is a remote analyser designed for use with a separate zirconia probe, while the ZR202 is an integrated transmitter/detector that combines the detector and analyser into a compact package with local display and infrared controls containing all the intelligent functions required for in situ measurements.

The modular construction allows the heater and probe assembly to be replaced on site, reducing maintenance costs.

In addition, the in situ measurement technique does not require any process conditioning or extractive sampling, which further reduces maintenance costs and allows faster measurement response to changes in the process.

The zirconia detector is available in lengths from 15cm to 5m, and can be used in process temperatures up to 700C and pressures up to 2.5bar with a pressure compensation option.

The remote-mounted ZR402 incorporates features such as automatic calibration control, sensor diagnostics, efficiency calculations, real-time trend graphing, two user-configurable analogue outputs, and three user-configurable measurement parameters including oxygen concentration, relative humidity, dewpoint and moisture content.

The integrated ZR202 unit includes a local LCD display and infrared pushbutton operation for local adjustments and calibration control.

The HART communication protocol is used for instrument configuration and accessing information on measured data and diagnostics.

The units are designed to meet CENELEC requirements for flameproof use.