Explosion-Proof Converter

Sensor self-assessment and data logging functions for Oxygen Analyzer that significantly reduce operating costs

  • Explosion-Proof Converter
    Explosion-Proof Converter

Yokogawa announces ZR802S explosion-proof converter as part of its OpreX Analyzers lineup. The ZR802S converter supports the IECEx, FM, ATEX, CSA, China Ex, Korea Ex, India Ex, and Taiwan Ex explosion-proof standards. It is intended for use with the ZR22S explosion-proof zirconia oxygen detector, an existing Yokogawa product with a highly durable zirconia sensor that is highly dust resistant and easy to install and replace. Together, the ZR802S converter and the ZR22S detector comprise a complete oxygen analyzer system. Yokogawa has sought with its zirconia oxygen concentration analyzers to introduce remote monitoring and other capabilities that reduce the time and effort required for maintenance operations and increase uptime. The ZR802S converter features a self-assessment function that provides early detection of deterioration in a zirconia oxygen detector, a data logging function that records essential maintenance information, and support for a number of key communication protocols. It is expected that these innovations will help to significantly reduce OPEX.

Data logging for reduced maintenance time

It transmits sensor resistance values automatically at regular intervals, enabling replacement timing to be determined without on-site inspection. Once an operator receives notification of a higher resistance value, which is an indication of deterioration in the sensor, maintenance personnel can take immediate action to correct the problem and prevent an instrument failure, thereby sustaining plant uptime. Data logging function helps to reduce maintenance time and downtime in the event of a fault. The ZR802S converter can log up to 40 days of measurements, alarm on/off history, and sensor resistance trend graphs, among other data. As well as being able to directly display logs on the LCD screen, it is also possible to export the data using an SD card. In the event of a fault, it can determine whether it is due to the analyzer system or the distributed control system (DCS) by looking into differences with the data from the host device. This helps reduce maintenance time and the downtime required to find a solution. The ZR802S converter supports all three of the following communication protocols: HART7 for analog output, and Modbus TCP and Modbus RTU for digital communications. It also complies with the NAMUR NE43 guideline for the issuance of signals to indicate a sensor fault and the NAMUR NE107 guideline for on-site instrument self-assessment functions. Using the ZR802S converter’s communication functions, cloud-based management is also possible. 

The analyzer is used for combustion management for heating furnaces and decomposition furnaces in the fields of oil refining, petrochemicals, and chemicals, but also for management of various types of furnaces, such as those used in steel production and waste incineration or the combustion control for boilers at power plants.