Yokogawa EJA118 Diaphragm Sealed Differential Pressure Transmitter

  • Brand   Yokogawa
  • Type   Yokogawa EJA118
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Introduction

Yokogawa EJA118 Diaphragm Sealed Differential Pressure Transmitter 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.

Yokogawa 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 of Yokogawa EJA118 Diaphragm Sealed Differential Pressure Transmitter

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 of Yokogawa EJA118 Diaphragm Sealed Differential Pressure Transmitter

Yokogawa EJA118W / EJA118N / EJA118Y
Diaphragm Sealed Differential Pressure Transmitters

M Capsule

H Capsule

Range

-100 to 100 kPa
(-400 to 400 inH2O)

-500 to 500 kPa
(-2000 to 2000 inH2O)

Span

2.5 to 100 kPa
(10 to 400 inH2O)

25 to 500 kPa
(100 to 2000 inH2O)

Accuracy

±0.2%

±0.2%

Degrees of protection

IP67, NEMA 4X, and JIS C0920 immersion proof

Certificates

FM, CENELEC 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

Flange rating pressure

Mounting

Transmitter: 2-inch pipe mounting
Diaphragm seals: flange mounting

Process flange size

Flush 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 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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