EJA118 Diaphragm Sealed Differential Pressure Transmitters

The EJA118W, EJA118N and EJA118Y diaphragm sealed differential pressure transmitters can be used to measure liquid, gas, or steam flow as well as liquid level, density, and pressure.

Product Information
Diaphragm seals are used to prevent process medium form entering directly into the pressure-sensing assembly of the differential pressure transmitter, they are connected to the transmitter using capillaries filled with fill fluid. Model EJA118W, EJA118N and EJA118Y Diaphragm Sealed Differential Pressure Transmitters can be used to measure liquid, gas, or steam flow, as well as liquid level, density, and pressure. They output a 4 to 20 mA DC signal corresponding to the measured differential pressure.

The EJA 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.
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

EJA118W / EJA118N / EJA118Y
Diaphragm Sealed Differential Pressure Transmitters
M CapsuleH Capsule
Range-100 to 100 kPa
(-400 to 400 inH2O)
-500 to 500 kPa
(-2000 to 2000 inH2O)
Span2.5 to 100 kPa
(10 to 400 inH2O)
25 to 500 kPa
(100 to 2000 inH2O)
Accuracy±0.2%±0.2%
Degrees of protectionIP67, NEMA 4X, and JIS C0920 immersion proof
CertificatesFM, CENELEC 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 pressureFlange rating pressure
MountingTransmitter: 2-inch pipe mounting
Diaphragm seals: flange mounting
Process flange sizeFlush type: 3-inch(80mm), 2-inch(50mm)
Extended type: 4-inch(100mm), 3-inch(80mm)

Combination type:4-inch(100mm) for extended high side,
3-inch(80mm) for flush low side
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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