Differential Pressure and Pressure Transmitters The clear path to operational excellence

DPharp Digital Transmitters A new standard for Unmatched precision and real world accuracy. Unconditional long term stability with lowest Total Cost of Ownership (TCO). Multi-sensing functionality. Inherently fail-safe sensor with no undiscovered failure modes. Certified to IEC61508 as standard for single use SIL2 and dual use SIL3. Rugged, yet compact construction. Multiple material options for harsh industrial environment.

WORKING PRINCIPLE Unequalled precision and long term stability for your measurements! DPharp digital sensor uses two single crystal silicon resonators vibrating at their natural frequencies. When pressure is applied, one of the resonators goes into tension, while the other goes into compression mode. The CPU directly counts the sensor output frequencies without any additional A/D conversion. Due to the excellent elastic properties of silicon material, the DPharp sensor exhibits greater linearity and repeatability, with no inherent hysteresis. Resonant sensor also provides a large output signal...

FIELD DIGITAL SOLUTIONS Knowledge IEC61508 Certified Safety as Standard, Not an Option! DPharp is an active pressure sensor, so even with no pressure applied the resonators oscillate at their natural frequencies. Two independent resonators are utilized. If either one or both fail, the transmitter diagnostics detects a capsule error. DPharp sensor is inherently fail-safe with no undiscovered failure modes. A patented reverse calculation algorithm validates internal measurements, calculations and detects any malfunction of the CPU. DPharp transmitters are capable of SIL2 single use and SIL3 redundant...

DISPLAY CAPABILITY Intelligent indicator clearly displays multiple process variables, user configurable engineering units, communication protocol, output status and diagnostics by alpha-numeric and bargraph display. When using digital protocol, details of instrument model, protocol version and device revision are indicated at start-up. Descriptive alarm messages display abnormalities clearly to simplify troubleshooting. Robustness of installed instrumentation greatly impacts their reliability and thereby plant availability. DPharp transmitters are designed for harsh industrial environments with...

PREMIUM PERFORMANCE ADVANCED DIAGNOSTICS EJX Series transmitters deliver premium performance up to 0.025% precision. Industry leading stability guarantee of 0.1% URL for 10 years means reduced maintenance with extended recalibration intervals. EJX differential pressure transmitters also provide a static pressure measurement with 0.2% accuracy enabling greater insight into your process with fewer devices. EJX Impulse Line Blockage Detection (ILBD) and heat tracing diagnostics increase plant availability by enabling predictive maintenance. The fluctuation of differential and static pressure, capsule...

MULTI-VARIABLE TRANSMITTER Dimensional Stability Discharge Coefficient, Reynolds Number Density Velocity, Viscosity EJX900 multi-variable transmitter successfully integrates the DPharp multi-sensing capability with an onboard flow computer and can be configured for multi-variable (DP, SP, T) or dynamically compensated massflow outputs. Dynamic flow compensation allows the EJX900 multi-variable transmitter to eliminate inherent errors in the DP flow calculations at actual operating condition and to model the flow profile more precisely. Extensive range of primary elements and process fluids are...

TECHNOLOGY EVOLUTION MODEL SELECTION DPharp EJX-A UniΔ Force Balance Analog Sensor Digital Sensor Capacitance PiezoResistive DPharp EJA-A DPharp EJA-E Yokogawa have been manufacturing electronic pressure transmitters for more than four decades. We revolutionized the industry and set a new standard for pressure measurement with the introduction of the DPharp digital sensor in 1991. The superior performance of the new technology enabled exponential market expansion. As of 2011, we have delivered over 5 million DPharp transmitters operating in various industries and applications to the complete...

are trademark of Yokogawa Electric Corporation for EJX series and EJA-E series Pressure Transmitters, respectively Other company names and product names used in this material are registered trademarks or trademarks of their respective owners. The clear path to operational excellence IN ADVANCE I WITH AGUTY VigilantPlant is Yokogawa's automation concept for safe, reliable, and profitable plant operations. VigilantPlant aims to enable an ongoing state of Operational Excellence where plant personnel are watchful and attentive, well-informed, and ready to take actions that optimize plant and business...