Yokogawa EJA530E In-Line Mount Gauge Pressure Transmitter

Overview of the Yokogawa EJA530E In-Line Gauge Pressure Transmitter

The Yokogawa EJA530E is a gauge pressure transmitter from the Yokogawa EJA-E series that uses the DPharp single crystal silicon resonant sensor for liquid, gas and steam pressure measurement. It is the in-line mounted model of the family: the process connection sits directly under the sensor capsule, which makes it a compact solution for pipelines, pump discharge lines and vessels where a differential pressure transmitter with a flange body is not required. The general specifications GS 01C31F01-01EN describe the EJA530E together with the EJA510E absolute pressure version, and quote a reference accuracy of ±0.055 % of span, or ±0.04 % with the high accuracy option.

As the official trusted supplier and regional supplier for Yokogawa, Seven Star LLC proudly supplies the Yokogawa EJA530E to customers across the Sultanate of Oman and the wider GCC. Seven Star LLC provides the official general specifications with each offer, so that engineers in Muscat, Sohar and Salalah can verify capsule range, wetted material and output code before ordering.

Sensing Principle of the Yokogawa EJA530E

The Yokogawa EJA530E is built around a silicon resonator. Pressure applied through the isolating diaphragm and the fill fluid, silicone oil as standard or fluorinated oil as an option, changes the resonant frequency of the sensing element, and the electronics convert the frequency shift into a digital pressure value that is then output as 4–20 mA. Because the sensor measures frequency rather than a small analog voltage, the transmitter keeps its specification over a long period, and Yokogawa quotes a stability of ±0.1 % of the upper range limit over ten years for the EJA530E.

Four capsule sizes cover the gauge pressure range: capsule A for spans of 10 to 200 kPa, capsule B for 0.02 to 2 MPa, capsule C for 0.1 to 10 MPa and capsule D for 0.5 to 50 MPa. Zero can be fully elevated or suppressed within the capsule limits, so the same device can be re-ranged without hardware changes. The response time is 90 ms, including a dead time of 45 ms, with an update period of 45 ms for pressure, and the amplifier damping can be adjusted from 0 to 100 s.

Engineering Design of the Yokogawa EJA530E

The wetted parts are available in 316L stainless steel for the process connector with a Hastelloy C-276 diaphragm, or entirely in Hastelloy C-276 for corrosive media. Process connections are ½ NPT female, ½ NPT male, G½ male and M20 × 1.5 male to DIN 16288. The amplifier housing is low-copper cast aluminum alloy, a corrosion-resistant variant of that alloy or ASTM CF-8M stainless steel, rated IP66/IP67 and Type 4X, and the weight is 1.2 kg for capsules A to C and 1.4 kg for capsule D without indicator and bracket.

Output signals are 4–20 mA DC with BRAIN or HART 5/HART 7 communication, a low-power 1–5 V DC output with HART 7, FOUNDATION Fieldbus and PROFIBUS PA. The loop supply voltage is 10.5 to 42 V DC for general use and flameproof types, and 10.5 to 30 V DC for intrinsically safe and type n versions. With a 24 V supply, loads up to 550 Ω can be used, and the output carries a 10-segment signal characterizer. The device runs from –40 to +85 °C ambient and handles process temperatures from –40 to +120 °C.

Key Features of the Yokogawa EJA530E

The Yokogawa EJA530E offers the following capabilities documented by Yokogawa:

• Reference accuracy of ±0.055 % of span, improved to ±0.04 % with the high accuracy option for the same capsule.
• Four capsules from 10 kPa up to a 50 MPa span, with a maximum of 70 MPa when option /HG is specified.
• Maximum overpressure of 4 MPa for capsules A and B, 20 MPa for capsule C and 60 MPa for capsule D.
• Ten-year stability of ±0.1 % of URL and an ambient temperature effect of ±(0.15 % of span + 0.15 % of URL) per 28 °C.
• Integral LCD with five-digit value, six-digit unit and bar graph, plus local parameter setting through the external zero screw.
• Self-diagnostics for CPU, hardware, configuration and process alarms, with user-configurable high and low pressure alarms.
• SIL 2 capability for single transmitter use and SIL 3 capability for dual transmitter use according to IEC 61508.
• Choice of BRAIN, HART, FOUNDATION Fieldbus and PROFIBUS PA digital communication.

Industrial Applications of the Yokogawa EJA530E

The Yokogawa EJA530E is used for gauge pressure monitoring on process pipelines, steam and boiler feed lines, compressed air and gas headers, hydraulic and lube oil systems and hydrostatic level measurement in tanks. Its in-line connection suits pump suction and discharge points, and capsule D with a range up to 50 MPa suits high pressure injection and test duties. In Oman, typical sites include power and desalination plants, oil and gas gathering, and process plants in the Sohar and Salalah economic zones.

Seven Star LLC supplies the pressure transmitter range throughout Oman and the GCC. Engineers can compare the Yokogawa EJA430E gauge pressure transmitter, the Yokogawa EJA110E differential pressure transmitter or the

Endress+Hauser Cerabar PMP51B

Technical Specifications of the Yokogawa EJA530E

The table summarizes the main data of the Yokogawa EJA530E from Yokogawa general specifications GS 01C31F01-01EN.

Request a Quote for Yokogawa EJA530E

To order the Yokogawa EJA530E, send Seven Star LLC the pressure range, medium, process connection, output code and approvals so that we can prepare a formal RFQ. The general specifications GS 01C31F01-01EN can be downloaded from this page, and our instrumentation division will confirm model codes and lead time at quotation. In Oman and the GCC, we supply the Yokogawa EJA530E with manufacturer documentation and local support.