Thermocouple with sapphire thermowell for extremes of gasification reactor applications
31 March 2009
Emerson Process Management has introduced the Rosemount thermocouple with gas tight sapphire protective tube for use in gasification reactor applications. The thermocouple gives extended operating life in difficult process conditions.
The thermocouple is enclosed within a special protective tube manufactured from commercially grown sapphire, which is corrosion resistant and impermeable to gases. The design enables accurate and reliable measurements over a significantly extended sensor life of 6,000 to 18,000 hours. This is typically three times the life of a standard thermocouple. By reducing the number of unplanned shutdowns due to sensor failure, production output is increased. Life time costs are also reduced since the longer operating life reduces the number of replacement sensors that are required.
The hermetic sealing of the sapphire protecting tube to the supporting bushing enhances safety and provides the longest life time for this type of thermocouple in gasification reactors.
The high temperature thermocouple assembly can be used with the Rosemount 3144P temperature transmitter for critical control and safety applications. The predictive thermocouple degradation diagnostics contained within the transmitter can further improve plant availability by providing an alarm when the resistance of the thermocouple changes. This enables maintenance staff to plan the change out of the thermocouple prior to an unplanned shutdown, minimising cost and plant downtime.
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