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 Yokogawa EJA438W and EJA438N Diaphragm Sealed Gauge Pressure Transmitter 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 Yokogawa EJA438W and EJA438N are available with BRAIN, HART, FOUNDATION™ fieldbus or PROFIBUS PA communication protocols.
Features of Yokogawa EJA438W and EJA438N Diaphragm Sealed Gauge Pressure Transmitter
- Excellent performance and stability
The Yokogawa EJA438W and EJA438N Diaphragm Sealed Gauge Pressure Transmitter use 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
Yokogawa EJA438W and EJA438N Diaphragm Sealed Gauge Pressure Transmitter offer 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 EJA438W and EJA438N Diaphragm Sealed Gauge Pressure Transmitter
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Yokogawa EJA438 Diaphragm Sealed Gauge Pressure Transmitters |
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EJA438W/EJA438N |
EJA438W |
EJA438N |
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Range |
-0.1 to 3 MPa |
-0.1 to 14 MPa |
-0.1 to 7 MPa |
Span |
0.06 to 3 MPa |
0.46 to 14 MPa |
0.46 to 7 MPa |
Accuracy |
±0.2% |
±0.2% |
±0.2% |
Degrees of protection |
IP67, NEMA 4X, and JIS C0920 immersion proof |
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Certificates |
FM, CENECEC ATEX, CSA, TIIS, IECEx |
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Output |
4 to 20 mA DC or FOUNDATION™ fieldbus or PROFIBUS PA 2-wire system with digital communication |
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Supply voltage |
BRAIN and HART:10.5 to 42 V DC (10.5 to 30 V DC for Intrinsically safe type) |
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Ambient temperature |
-40 to 60 deg C (-40 to 140 deg F) (general use type) |
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Process temperature |
-50 to 300 deg C (-58 to 572 deg F) |
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Maximum working pressure |
Max. measurement range valve |
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Mounting |
Transmitter: 2-inch pipe mounting |
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Process flange size |
Flush type: 3-inch (80mm), 2-inch (50mm) |
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Diaphragm material |
SUS316L, Hastelloy C-276, Tantalum, Titanium |
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Process flange material |
S25C, SUS304, SUS316 |
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Housing |
Cast aluminum alloy or SUS316 equivalent stainless steel (optional) |