Enhanced pressure transmitter for North American market

Yokogawa releases enhanced EJA DP transmitter, manufactured in U.S. plant.


Yokogawa Corporation of America announced its enhanced DPharp EJA series pressure/differential pressure transmitters, one of its core sensor products, which will be produced in its Newnan, Ga., manufacturing facility to support the North American market.Yokogawa Corporation of America announced its enhanced DPharp EJA series pressure/differential pressure transmitters, one of its core sensor products, which will be produced in its Newnan, Ga., manufacturing facility to support the North American market.

Chet Mroz, CEO of Yokogawa Corporation of America, says, “The enhanced EJA provides great value to customers through its improved performance, longer stability period, fast response and built-in SIL safety capabilities while maintaining the same price of the original EJA design.”

Mroz adds that while remaining in the same price range, the enhanced DPharp EJA series transmitters will now offer significantly improved performance and functionality, bringing great cost benefits for users. As standard features, they will have the same high-speed response and multi-sensing functionality available with the high-end DPharp EJX series. 

Development background

Pressure/differential pressure transmitters are typically used in the oil, petrochemical, and chemical industries to measure liquid, gas, and steam flow rates as well as liquid levels in tanks. DPharp EJA series transmitters are compact, multipurpose sensors with a large installed base. The company says more than 5 million units have been sold since this series was launched in 1994. The DPharp EJX is Yokogawa’s high-end transmitter series and has self-diagnostics and other advanced functions that help plants to reduce workload and improve maintenance efficiency.

Yokogawa has enhanced its DPharp EJA series transmitters to give them the same high response speed and multi-sensing functionality found in the DPharp EJX series. These enhanced transmitters retain the high measurement precision that is characteristic of all DPharp series products. Product features include:

1. Multi-sensing—The enhanced EJA series transmitters will be able to measure differential and static pressure simultaneously. A single enhanced EJA transmitter will thus be able to measure both the liquid level and the pressure in a tank. Previously, this could only be done with two EJA transmitters.

2. High-speed response—The response time has been brought down to 90 ms, which equals the capability of the EJX series transmitters. Specifically, this is the time from the detection of pressure to the output of an electric signal. The faster response time will now allow the enhanced EJA series transmitters to be used in high-speed applications such as turbine steam volume control.

3. Compact/lightweight design with a larger indicator—The improved EJA series transmitters weigh 30% less and have indicators that are nearly twice the size of those on the non-enhanced version. Additionally, the optional ultra-low copper aluminum housing can provide much improved corrosion resistance over standard aluminum housings making it a suitable alternative to 316SS for offshore environments, but with more than 3 pounds of weight savings per device.

4. Safety standard compliance/certification—The enhanced transmitters now comply with the IEC61508 international safety standard on the functional safety of electrical/electronic devices and are certified for use in safety integrity level (SIL) 2 applications as stipulated by the IEC. The enhanced EJA offers SIL capability as a standard feature offering users with mixed SIL and non-safety related applications lower CAPEX and OPEX costs through reduced spares inventory, simplified application engineering and device selection.

Typical applications will include measurement of pressure and flow for liquid, gas, and steam; plus hydrostatic liquid level measurement.



Edited by Peter Welander, pwelander@cfemedia.com

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