High Performance Ejx530a Mount Absolute Pressure Transmitter 4 20ma
Pressure Transmitter
1. What It Is
The EJX530A is a high-performance in-line gauge pressure transmitter in Yokogawa’s
premium EJX-A (DPharp) series. It’s used to measure the pressure of
liquids, gases, or steam and produce a proportional 4–20 mA output
(linear or square-root) with superimposed digital communications
(BRAIN or HART). FOUNDATION Fieldbus and PROFIBUS PA versions are
also available.
2. When to Choose EJX530A (vs. EJX510A)
Choose the EJX530A when your application requires gauge pressure (pressure referenced to atmosphere). If you need absolute pressure, the companion model is EJX510A.
3. Key Performance Highlights
Reference accuracy: Up to ±0.04% of span (Span A) with scaled accuracy rules for higher
ranges (see table below).
Long-term stability: ±0.1% of URL for 15 years under normal operating conditions.
Fast response: 90 ms (all capsules) when damping set to zero.
4. Pressure Capsules & Ranges (Gauge)
| Capsule | Calibrated Span | Range Limits | Approx. Upper Range Limit (URL) |
|---|
| A | 8–200 kPa | −100 to 200 kPa | 200 kPa |
| B | 0.02–2 MPa | −0.1 to 2 MPa | 2 MPa |
| C | 0.1–10 MPa | −0.1 to 10 MPa | 10 MPa |
| D | 0.5–50 MPa | −0.1 to 50 MPa | 50 MPa |
(Conversions: 200 kPa ≈ 29 psi; 2 MPa ≈ 290 psi; 10 MPa ≈ 1450 psi;
50 MPa ≈ 7200 psi.)
5. Output, Configuration & Local Interface
Signal: 2-wire 4–20 mA DC with superimposed BRAIN or HART FSK; linear or
square-root selectable.
Integral LCD indicator (option) displays pressure, % span, scaled
engineering units, bargraph.
Local Parameter Setting (LPS): Configure tag, units, LRV/URV,
damping, output mode, and perform local re-range using the push
button/zero screw—useful for fast commissioning without a
communicator.
6. Advanced Diagnostics & Safety
Optional advanced diagnostics can detect impulse line blockage and heat trace failure, and can drive an analog alert status when
enabled.
Standard EJX series units (except Fieldbus/PROFIBUS types) are certified to SIL 2 for safety applications; consult the Functional
Safety Manual for integration into safety instrumented functions.
Distributors note third-party TÜV/Exida certifications are
available in certain configurations—verify per your project safety
requirements.
7. Environmental & Operating Limits
Ambient: −40 to +85 °C; with LCD display −30 to +80 °C.
Process temperature: −40 to +120 °C (may be further limited by
approvals/options).
Working pressure: Up to capsule URL (to 50 MPa for D capsule). See
over-pressure and approval tables when applying in hazardous
areas.
8. Construction & Materials
Wetted parts selections include 316L SST process connections and Hastelloy C-276 diaphragms among others (specified via suffix
codes).
Housing options: low-copper cast aluminum (standard), corrosion-resistant coated variants, or ASTM CF-8M stainless steel (optional).
Enclosure ratings: IP66/IP67, Type 4X.
9. Hazardous Area Approvals (Selected)
Multiple global approvals are available (ordered by option codes),
including ATEX Flameproof / Intrinsically Safe, IECEx Flameproof / IS, FM/CSA Explosionproof, and combinations packages (e.g., KU22, FU1,
etc.). Check the code string on your model for exact certification
and temperature class.
10. Ordering Snapshot (Reading the Code)
A typical code string (example only): EJX530A-E D S7N-017DL /D1 /KF22 indicates model, output (HART),
capsule (span D), wetted materials, process connection, indicator,
calibration units (psi), and ATEX approval option. Always confirm
each suffix in the current Yokogawa General Specifications before
ordering.
