Yokogawa Diaphragm Sealed Gauge Pressure Transmitter, EJA438N
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EJA438N Diaphragm Sealed Gauge Pressure Transmitter

Brand: Yokogawa Electric Corporation
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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 EJA438N Diaphragm Sealed Gauge Pressure Transmitters can be used to measure liquid, gas or steam pressure. They output a 4-20 mA DC signal corresponding to the measured pressure.

The models EJA438N feature remote setup and monitoring through communications with the model BT200/100 BRAIN TERMINAL, CENTUM CS/XL system etc.
Features
  • 0.2% Accuracy
  • 700 ms Response Time
  • External Zero Adjust

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Specifications

Brand

Accuracy

  • ± 0.2 %

Alarm

  • Down-Scale: -2.5 %, 3.6 mA DC or Less
  • Down-Scale: -5 %, 3.2 mA DC or Less
  • Up-scale: 110 %, 21.6 mA DC or more (Standard)

Ambient Temperature Range

  • -30° to 60° C (-22° to 140° F) - Integral Indicator
  • -40° to 60° C (-40° to 140° F) - General-Use Typical

Approvals & Certifications

  • Leak Test
  • Mill Certificate
  • Pressure Test

Approvals & Certifications

  • ATEX Flameproof
  • CSA Explosion-proof & Intrinsically Safe
  • EMC EN 61326-1 Class A, EN 61326-2-3
  • FM Explosion-proof & Intrinsically Safe Approval
  • IEC Ex Intrinsically Safe, Typical N & Flameproof Approval
  • NAMUR NE43
  • PED 97/23/EC - Sound Engineering Practice
  • TIIS Flameproof & Intrinsically Safe Approval

Cable Material

  • Polyethylene Insulated PVC Sheathed

Capillary Length

  • 16.4 feet (5 metres)

Capillary Material

  • JIS SUS316 - Capillary Tube

Communication

  • BRAIN
  • FOUNDATION Fieldbus
  • HART
  • PROFIBUS PA

Current

  • 6,000 A, Max.

Damping Adjustment

  • 0.2 to 64 seconds - Set in 9 Increments

Diaphragm Material

  • JIS SUS316L

Display

  • LCD Display

Distance

  • 2 Kilometers (1.25 Miles) when CEV - Communication Distance

Electrical Connectors

  • 1/2” NPT Female
  • Blind Plug
  • G 1/2” Female
  • M20 Female
  • PG13.5 Female

Enclosure Finish

  • Deep Sea Moss Green (Munsell 0.6 GY3.1/2.0)
  • Epoxy Resin-Baked Coating
  • Polyurethance Resin Baked Finish

Enclosure, Body Material

  • Cast Aluminum Alloy - Amplifier Housing
  • JIS SCS14A (Stainless Steel) - Amplifier Housing

Environmental Protection

  • IP67
  • NEMA 4X

Fill Material

  • Ethylene Glycol
  • Fluorinated Oil
  • Silicone Oil

Flange Material

  • JIS S25C
  • JIS SCS14A - Cover Flange
  • JIS SUS304
  • JIS SUS316

Flange Size - 3” (DN 80)

  • 3” (DN 80) - 150# ANSI/JPI
  • 3” (DN 80) - 300# ANSI/JPI
  • 3” (DN 80) - DIN PN 10
  • 3” (DN 80) - DIN PN 16
  • 3” (DN 80) - DIN PN 25
  • 3” (DN 80) - DIN PN 40
  • 3” (DN 80) - JIS 10K
  • 3” (DN 80) - JIS 20K
  • 3” (DN 80) - JIS 40K

Flange Size - 4” (DN 100)

  • 4” (DN 100) - 150# ANSI/JPI
  • 4” (DN 100) - 300# ANSI/JPI
  • 4” (DN 100) - DIN PN 10
  • 4” (DN 100) - DIN PN 16
  • 4” (DN 100) - DIN PN 25
  • 4” (DN 100) - DIN PN 40
  • 4” (DN 100) - JIS 10K
  • 4” (DN 100) - JIS 20K
  • 4” (DN 100) - JIS 40K

Fluid Specific Gravity

  • 0.94 to 1.09 at 25° C (77° F) - Silicone Oil
  • 1.09 at 25° C (77° F) - Ethylene Glycol
  • 1.90 to 1.92 at 25° C (77° F) - Fluorinated Oil

Humidity

  • 5 to 100 % Relative Humidity at 40° C (104° F) - Ambient Humidity

Input Impedance

  • 10 kiloohms or more at 2.4 kHz

Load

  • 0.22 μF or Less - Load Capacitance
  • 3.3 MH or Less - Load Inductance

Materials of Construction

  • JIS SECC - Mounting Bracket
  • JIS SUS304 - Protection Tube, Tag Plate, Mounting Bracket
  • JIS SUS316 - Tag Plate, Mounting Bracket

Mounting

  • 2” Pipe Mounting - Transmitter
  • Flange Mounting - Diaphragm Seal

Mounting Position

  • Horizontal

NACE & NIST

  • NACE MR-0175

Nut & Bolt Material

  • JIS SCM435 - Cover Flange
  • JIS SUS630 Stainless Steel - Cover Flange

O-Ring Material

  • Fluororubber

Operating Temperature

  • 20° to 150° C (68° to 302° F) - Teflon Film
  • Maximum

Output

  • 3.8-20.5 mA
  • 4-20 mA DC (2-Wire)

Plug Material

  • SUS316 (316 Stainless Steel) - Blind Plug

Power Supply Effect

  • ± 0.005 % Per Volt (21.6-32 Vdc, 350 ohms)

Pressure Range

  • bar: -1 to 70
  • kPa: -100 to 7,000
  • psi: -14.5 to 1,015

Pressure Type

  • Gauge

Process Temperature

  • -50° to 300° C (-58° to 572° F)

Response Time

  • 0.3 second, Max.

Screw Material

  • 316 Stainless Steel - Zero-Adjustment Screw, Stopper Screw

Supply Pressure

  • psi: 0.38 to 14.5 (kPa: 2.7 to 100, bar: 0.026 to 1)

Supply Voltage

  • 10.5-28 Vdc - TIIS Intrinsically Safe Typical
  • 10.5-30 Vdc - Intrinsically Safe, Typical N, Non-Incendive or Non-Sparking Typical
  • 10.5-32 Vdc - Lightning Protector
  • 10.5-42 Vdc - General Use & Flameproof Typical
  • 16.4-42 Vdc - Communication Line

Temperature Effect

  • ± 1.4 %/50° C (122° F) - Zero Shift Ambient Temperature Effect
  • ± 1.6 %/50° C (122° F) - Total Shift Ambient Temperature Effect

Update Time

  • 0.125 second

Wetted Materials

  • JIS SUS316 Stainless Steel - Pipe

Zero Offset

  • Continuously Adjustable Resolution: 0.01 % of Span - External Zero Adjustment

Documentation

Data Sheets

Document

Manual

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