Yokogawa EJA438Transmitter Diaphragm seal is used to prevent process medium from entering directly into the pressure-sensing assembly of the pressure transmitter. It is connected to the transmitter using capillary filled with fill fluid. Models EJA438W and EJA438N Diaphragm Sealed Gauge Pressure Transmitters can be used to measure liquid, gas or steam pressure. They output a 4 to 20 mA DC signal corresponding to the measured pressure. The EJA Series is available with BRAIN, HART, FOUNDATION™ fieldbus or PROFIBUS PA communication protocols. - Excellent performance and stability The EJA series uses a silicon resonant sensor 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. -Output:Two wire 4 to 20 mA DC EJA series offers two types of fieldbus models, FOUNDATION™ fieldbus Low Voltage Mode and PROFIBUS PA devices, which ensure interoperability between Yokogawa 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. Specifications Diaphragm Sealed Gauge Pressure Transmitters EJA438W/EJA438N A Capsule EJA438W B Capsule EJA438N B Capsule Range -0.1 to 3 MPa (-15 to 430 psi) -0.1 to 14 MPa (-15 to 2000 psi) -0.1 to 7 MPa (-15 to 1000 psi) Span 0.06 to 3 MPa (8.6 to 430 psi) 0.46 to 14 MPa (66 to 2000 psi) 0.46 to 7 MPa (66 to 1000 psi) Accuracy ±0.2% ±0.2% ±0.2% Degrees of protection IP67, NEMA 4X, and JIS C0920 immersion proof Certificates FM, CENECEC ATEX, CSA, TIIS, IECEx Output 4 to 20 mA DC or FOUNDATION™ fieldbus or PROFIBUS PA 2-wire system with digital communication Supply voltage BRAIN and HART:10.5 to 42 V DC (10.5 to 30 V DC for Intrinsically safe type) Fieldbus:9 to 32 V DC (9 to 24 V DC for Entity model and 9 to 17.5 V DC for FISCO model) Ambient temperature -40 to 60 deg C (-40 to 140 deg F) (general use type) -30 to 60 deg C (-22 to 140 deg F) (with integral indicator) It must be within the fill fluid operating temprature range Process temperature -50 to 300 deg C (-58 to 572 deg F) It must be within the fill fluid operating temprature range Maximum working pressure Max. measurement range valve The working pressure must be within the flange rating. Mounting Transmitter: 2-inch pipe mounting Diaphragm seal: flange mounting Process flange size Flush type: 3-inch (80mm), 2-inch (50mm) Extended type: 4-inch (100mm), 3-inch (80mm) Diaphragm material SUS316L, Hastelloy C-276, Tantalum, Titanium Process flange material S25C, SUS304, SUS316 Housing Cast aluminum alloy or SUS316 equivalent stainless steel (optional)