Friday, 28 September 2012

Pressure/DP Transmitters based digital resonant sensing!

The digital evolution continues with the release of the new industry standard for pressure measurement 

The new EJA series of pressure/differential-pressure transmitters is the latest addition to the Yokogawa range of industrial sensor products based on the company’s unique DPharp digital resonant sensing technology.

Targeted at mid-range applications in industries such as chemicals, petrochemicals, oil & gas, power generation and refineries, the new EJA offers an exceptional price/performance specification by adding new levels of functionality and performance compared with the original EJA. The first generation of the EJA series of transmitters was originally launched in 1994, and to date approximately five million units have been delivered to customers all around the world. Additional features incorporated in the new EJA series include multi-sensing capability, higher-speed response, safety as standard and a more user friendly indicator, all packaged in a more compact and lighter transmitter.

The multi-sensing capability means that a new EJA differential pressure transmitter will be able to simultaneously measure both differential and static pressure. A single new EJA differential pressure transmitter will thus be able to measure both the liquid level and the pressure in a tank: something that could only be done traditionally by using two pressure transmitters.

The response time - the time from the detection of a pressure change to the change in the output of an electric signal - has been brought down to 90 ms, which equals the capability of Yokogawa’s premium EJX series. This faster response time will now allow the new EJA transmitters to be used in high-speed applications such as turbine surge control.

The new EJA also complies with the International Electrotechnical Commission’s (IEC) IEC61508 standard on the functional safety of electrical/electronic devices and is suitable for use in safety integrity level (SIL) 2 applications in single mode and SIL 3 applications in dual mode. Independent certificates and reports, from both TUV and, come as standard to support this statement: a feature that is unique to Yokogawa’s DPharp sensing technology.

The compact and lightweight design of the new EJA transmitters means that they weigh 30% less than earlier models. At the same time, however, they have LCD indicators that are nearly twice the size of those on the earlier versions and provide comprehensive information on process variables, units and alarms.

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