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Safety - February 2004Pressure transmitters meet the latest process industry standardsThe new DPharp EJX Series of differential pressure and pressure transmitters from Yokogawa UK combines new sensing techniques to ensure high accuracy and stability with built-in safety features that meet the latest process industry safety standards. The DPharp EJX Series employs an advanced MEMS (micro-electro-mechanical systems) silicon-resonant sensor that provides a standard accuracy of ±0.04% (optional reference accuracy of ±0.025%) and a 0.1% ten-year stability guarantee. The new sensor design also improves overpressure protection and minimises the effect of temperature and static pressure changes. A concept known as 'Total Accuracy' provides a comprehensive performance evaluation benchmark by incorporating the conditions of the actual working environment such as ambient temperature, static pressure and overpressure that all affect measurement accuracy. The unparalleled response time for a microprocessor based transmitter of 95ms allows the EJX to be considered for applications, such as compressor control, which involve rapidly-changing pressures. Models are available for differential pressure (EJX110A), gauge pressure (EJX430A) and absolute pressure (EJX310A). The design of the DPharp sensor allows both differential pressure and static pressure to be transmitted from one EJX110A transmitter. This unique design will also allow enhanced DP level (strapping tables) and DP flow (RTD input and mass flow calculations) solutions to be developed in the very near future. The DPharp EJX is said to be the first pressure transmitter series to be delivered as standard with TÜV approval, compliant with IEC61508 and with Safety Integrity Level (SIL) 2 of the new process industry safety standard IEC61511. Data can be monitored via 4-20 mA and digital communications such as HART, BRAIN and Foundation Fieldbus (Spring 2004) protocols and displayed on a built-in multi-function LCD indicator which incorporates a bargraph and digital readout that clearly displays the most important pressure variables. Diagnostic functions with clear text messages help to validate process information easily and precisely.
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