EJA438 Diaphragm Sealed Gauge Pressure Transmitters

Models EJA438W, EJA438N Diaphragm Sealed Gauge Pressure Transmitters can be used to measure liquid, gas, or steam flow as well as liquid level, density, and pressure.

Product Information

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.

		EJA438W and EJA438N general specifications

		EJA438W and EJA438N User's Manual Terms of Use for Manuals

		List of EJA series general specifications

		List of EJA series drawings

Features

-	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. 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)

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