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 InformationEJA438 Diaphragm Sealed Gauge Pressure Transmitters
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 EJA438 Diaphragm Sealed Gauge Pressure Transmitters Series is available with BRAIN, HART, FOUNDATION™ fieldbus or PROFIBUS PA communication protocols.

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.
EJA438 Diaphragm Sealed Gauge Pressure Transmitters 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 EJA438 Diaphragm Sealed Gauge Pressure Transmitters 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)
Span0.06 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 protectionIP67, NEMA 4X, and JIS C0920 immersion proof
CertificatesFM, CENECEC ATEX, CSA, TIIS, IECEx
Output4 to 20 mA DC or FOUNDATION™ fieldbus or PROFIBUS PA 2-wire system with digital communication
Supply voltageBRAIN 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 pressureMax. measurement range valve
The working pressure must be within the flange rating.
MountingTransmitter: 2-inch pipe mounting
Diaphragm seal: flange mounting
Process flange sizeFlush type: 3-inch (80mm), 2-inch (50mm)
Extended type: 4-inch (100mm), 3-inch (80mm)
Diaphragm materialSUS316L, Hastelloy C-276, Tantalum, Titanium
Process flange materialS25C, SUS304, SUS316
HousingCast aluminum alloy or SUS316 equivalent stainless steel (optional)

 

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