EJX910A Multivariable Transmitter

Digital Performance

The DPharp sensor directly outputs a digital signal, eliminating the need for analog to digital conversion and improving performance. 

Long-term Stability

When installed in the field, DP transmitters are subjected to continuous variations in pressure and temperature which will affect the accuracy. The performance may drift over time and is quantified using long term stability. There is unconditional guarantee of long-term stability under the complete range of operating conditions.

Standard Diagnostics

Standard

• 40 self-diagnostic checks to ensure that everything is running smoothly within the transmitter.
• The transmitter features a patented back-check technology that reverse checks all calculations in real-time.
• The DPHarp sensor is an active sensor, constantly supplying a signal even when the process has not changed. If the signal is lost from the sensor, the transmitter knows there is an issue.

Advanced

Predictive impulse line blocking and heat tracing diagnostics anticipate whether troubleshooting is needed.

Local Indicator

Easy to read indicator provides all the information you need. The indicator can display any of the variables measured (DP, SP, External Temperature); alarm codes with short text; and a sweeping bar graph to give a graphical representation of the process. Fully programmable, the indicator is customizable for your needs.

Safety as Standard

All Yokogawa transmitters:

• Are designed and certified to IEC61508:2010 Parts 1 through 7 and IEC61511:2004 Parts 1 through 3 by Exida® and TÜV Rheinland®
• Are certified for single transmitter use in SIL2 safety applications and dual transmitter use in SIL3 safety applications
• Can be used for both process control and safety applications

Extended Calibration Check Intervals

When devices are initially installed, they operate at peak performance, but what happens after they are running under various process conditions and poorly managed or maintained?

Changing operating conditions can cause transmitters to drift to the point where they are no longer able to make accurate measurements for the process loop they are installed in, resulting in poor quality or an impact on product yields. This requires a calibration check interval to ensure you’re operating within desired error limits.

EJX-A series transmitters have a long-term stability of ±0.1% per 15 years under all operational conditions, reducing calibration frequencies and maintenance costs.

EJX910A Communication Protocols

HART Protocol

• 1.0% mass flow rate accuracy over 1:10 flow range
• Simultaneous dual output of 4 to 20mA and pulse signals
• HART protocol revision selectable from HART 5 or HART 7
• SIL 2 certified standard

FOUNDATION Fieldbus Protocol

• 1.0% mass flow rate accuracy over 1:10 flow range
• Various function blocks available: 5 AIs, AR, IT, SC, and IS standard
• PID is an optional feature
• Cyclically displays up to 10 values

RS485 Modbus Protocol

• Provides easy multi-sensing data transmission to flow computers
• Cyclically display up to 16 variables including RTU management data
• Up to 32 transmitters can be connected by multi-drop communication
• 32 character tag and squawk are supported for easy identification of transmitters

International Certifications

With the rapid globalization of markets, numerous international standards and approvals are becoming necessary. Yokogawa pressure transmitters have acquired various international certifications including FM, CSA, ATEX, IECEx, INMETRO, KOSHA, EAC, and NEPSI.

Proven Technology

Yokogawa’s DPharp sensor technology was developed in the early 1990s, and today, over 11 million Yokogawa transmitters and calibrators are installed using this technology.

Independent Third Party Verification

The performance and reliability of Yokogawa’s EJX-A transmitter series have been verified by independent third parties from around the world. From Safety System SIL rating to general performance evaluations, the EJX-A series has met or surpassed every test that it has been given.