• Model EJX438A Diaphragm Sealed Gauge Pressure Transmitter
Diaphragm seal is used to prevent process medium form entering directly into the pressure-sensing assembly of the pressure transmitter, it is connected to the transmitter using capillary filled with fill fluid.

EJX438A Diaphragm Sealed Gauge Pressure Transmitters can be used to measure liquid, gas, or steam pressure. EJX438A outputs a 4 to 20 mA DC signal corresponding to the measured pressure. It also features quick response, remote setup and monitoring via BRAIN or HART communications, and diagnostics and optional status output for pressure high/low alarm. The multi-sensing technology provides the advanced diagnostic function to detect such abnormality as an impulse line blockage.

FOUNDATION Fieldbus and PROFIBUS PA protocol types are also available.

All EJX series models in their standard configuration, with the exception of the Fieldbus and PROFIBUS types, are certified by TÜV as complying with SIL 2 for safety requirement.

Modify Configuration

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Item #
Item #
Model
Output Signal
Measurement Span (Capsule) 1
Coverflange Bolts and Nuts Material
  • C: 660 SST
  • G: 316L SST
  • J: B7 carbon steel
Installation
Amplifier Housing
  • 1: Cast aluminum alloy
  • 2: ASTM CF-8M stainless steel
  • 3: Cast aluminum alloy with corrosion resistance properties
Electrical Connection
Integral Indicator
  • D: Digital indicator
  • E: Digital indicator with the range setting switch (push button)
  • N: None
Mounting Bracket
  • B: 304 SST 2-inch pipe mounting, flat type
  • J: 316 SST 2-inch pipe mounting, flat type
  • N: None
Select Approval
  • CF1: Canadian Standards Association (CSA) - Explosionproof Approval
  • CS1: Canadian Standards Association (CSA) - Intrinsically safe Approval
  • CU1: Canadian Standards Association (CSA) - Combined CF1 and CS1
  • FF1: FM Explosionproof Approval
  • FS1: FM Intrinsically safe Approval
  • FU1: FM Combined FF1 and FS1
  • KF22: ATEX - Flameproof Approval
  • KS21: ATEX - Intrinsically safe Approval
  • KU22: ATEX - Combined KF22, KS21 and ATEX Intrinsically safe Ex ic
  • None
  • SF2: IECEx Scheme - Flameproof Approval
  • SS26: IECEx Intrinsically safe Approval
  • SU21: IECEx Intrinsically safe and Flameproof Approval
Process Connection Style
  • E: Extended Type
  • W: Flush Type
Process Connection Size
  • 3: 3-inch (80mm)
  • 4: 4-inch (100 mm)
Flange Rating
Flange Material
  • A: JIS S25C
  • B: 304 SST
  • C: 316 SST
Wetted Parts Material 2
Gasket Contact Surface
Flushing Connection Ring
Extension
Fill Fluid
Capillary Connection
Capillary Length
Painting - Color change (Optional)
  • None
  • P: Painting: Color change (Amplifier cover only)
  • PR: Painting: Color change (Amplifier cover and terminal cover, Munsell 7.5 R4/14)
Status Output (Optional)
  • AL: Transistor output (sink type); Contact rating: 10.5 to 30 V DC, 120 mA DC(max ) Low level: 0 to 2 V DC
  • None
Oil-prohibited Use (Optional)
  • K1: Oil-prohibited Use - Degrease cleansing treatment
  • K5: Oil-prohibited Use with dehydrating treatment - Degrease cleansing and dehydrating treatment
  • None
Calibration Unit (Optional)
  • D1: P calibration (psi unit)
  • D3: bar calibration (bar unit)
  • D4: M calibration (kgf/cm2 unit)
  • None
Output Limits and Failure Operation (Optional)
  • C1: Output limits and failure operation - Failure alarm down-scale: Output status at CPU failure and hardware error is -5%, 3.2mA DC or less
  • C2: Output limits and failure operation - NAMUR NE43 Compliant (Failure alarm down-scale: Output status at CPU failure and hardware error is -5%, 3.2 mA DC or less)
  • C3: Output limits and failure operation - NAMUR NE43 Compliant (Failure alarm up-scale: Output status at CPU failure and hardware error is 110%, 21.6 mA or more)
  • None
Optional Specification
  • A: Lightning protector
  • A1: Gold-plated diaphragm
  • CB: Data configuration at factory - Data configuration for BRAIN communication type (Software damping)
  • HC: 316 SST Exterior Parts (316 SST zero-adjustment screw and setscrews)
  • HE: Fluoro-rubber O-ring (All O-rings of amplifier housing. Lower limit of ambient temperature: –15°C (5°F))
  • M2E: Material certificate - Process flange, Block, Pipe, Base
  • M2W: Material certificate - Process flange, Block
  • N4: Wired tag plate (316 SST tag plate wired onto transmitter)
  • R: Operating temperature correction
  • V: Capillary without PVC sheaths
  • X2: Painting - Coating change (Anti-corrosion coating)
  • 1 When specified process connection style code E, maximum range and span are 7 MPa (1000 psi.)
  • 2 Be very careful with highly corrosive process fluids such as hydrochloric acid, sulfuric acid, hydrogen sulfide, sodium hypochlorite, and high-temperature steam (150°C [302°F] or above). Contact Yokogawa for detailed information of the wetted parts material
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