Diaphragm Sealed Pressure Transmitter
Yokogawa EJA438W and EJA438N Diaphragm Sealed Pressure Transmitter
The EJA-A series is Yokogawa’s most successful pressure transmitter line. First released in 1991, it continues to offer high performance and high reliability for any application. With an installed base of over 4-1/2 million EJA-A transmitters worldwide, it has a proven track record that makes it a true industry workhorse.
The EJA438 is a Gauge Pressure Transmitter with a Remote Diaphragm seal attached.
It is available with a Flush Type Remote Seal (EJA438W) or an Extended Type Remote Seal (EJA438N).
EJA438 features include:
- 0.2% Accuracy
- 700 ms Response Time
- External Zero Adjust
Diaphragm Sealed Pressure Transmitter
Yokogawa EJA438W and EJA438N Diaphragm Sealed Pressure Transmitter
Diaphragm seal is used to prevent process medium from entering directly into the pressure-sensing assembly of the pressure transmitter. It connecte to the transmitter using capillary filled with fill fluid.
Models EJA438W and EJA438N Diaphragm Sealed Gauge Pressure Transmitters can use to measure liquid, gas or steam pressure. They output a 4 to 20 mA DC signal corresponding to the measured pressure.
The models EJA438W and EJA438N feature remote setup and monitoring through communications with the model BT200/100 BRAIN TERMINAL, CENTUM CS/XL system etc.
Features:
- Excellent performance and stability
The EJA series uses a formed from monocrystal silicon, a perfect material which has no hysteresis in pressure or temperature changes. The sensor minimizes overpressure, temperature change, and static pressure effects, and thus offers unmatched long-term stability.
- Compact and light-weight design
Half the weight of conventional models thanks to miniaturization of the casing with the amplifier ASIC, pressure cell structure, and flange. The ASIC uses the minimum number of parts and improves the reliability of the amplifier.
- Fieldbus communication capability
Fieldbus is a digital two-way communication system. It is a revolutionary technology for configuring instrumentation control systems and a promising successor to the standard 4 to 20 mA analog communication used in most field instruments today.
EJA series offers two types of fieldbus models, FOUNDATION fieldbus Low Voltage Mode and PROFIBUS PA devices, which ensure interoperability between and other manufactures. As for software, the EJA series incorporates two AI function blocks that compute differential and static pressures to allow flexible configuration of instrumentation.
