EJA110E-JHT5G-919EB/GF12/VR Yokogawa

EJA110E-JHT5G-919EB/GF12/VR Yokogawa Relay Input Module

Product  Description：

Yokogawa Relay Input Modules are specialized discrete interface components designed for use within the CENTUM Distributed Control System (DCS) and ProSafe-RS Safety Instrumented Systems. These modules are specifically engineered to isolate and detect the state of external field contacts by using physical, electromagnetic relays rather than solid-state semiconductor components. This design ensures robust electrical isolation and makes the module highly resilient against transient voltage spikes and high electrical noise commonly found in heavy industrial environments.

Product Parameters

The technical parameters of Yokogawa Relay Input Modules define their operating limits and signal conversion capacities:

• Channel Density: Typically configured in groupings of 8 channels or 16 channels per module to balance space constraints and isolation requirements.

• Input Voltage Rating: Supports a wide range of external wetting voltages, including 24V DC, 48V DC, 110V DC, and 100V to 240V AC.

• Contact Current Capability: The internal relay coils are designed for ultra-low power consumption, while the field-side monitoring loops typically handle currents between 5mA and 50mA to maintain wetting current across field switches.

• Insulation Resistance: Provides extreme isolation, often specified at 20 Megohms or higher at 500V DC between the field side, system backplane, and adjacent channels.

• Dielectric Strength: Built to withstand high-voltage transients, with standard ratings of 1500V AC or higher for one minute between field terminals and earth ground.

• Response and Filter Time: Features configurable input filter delays, typically adjustable between 2 milliseconds and 20 milliseconds, to eliminate signal chatter from mechanical field contacts.

Product Advantages

Yokogawa Relay Input Modules offer distinct advantages for high-reliability process plants and safety-critical environments:

• Absolute Physical Isolation: The use of mechanical relays provides a true physical break between the field wiring and the sensitive control system backplane, protecting the core DCS processor from catastrophic external electrical faults.

• Exceptional Noise Immunity: Immune to leakage currents and high-frequency electromagnetic interference (EMI) that can cause false triggering in standard solid-state transistor input cards.

• Diverse Voltage Tolerance: Highly versatile, allowing a single module to interface with field devices running on completely different voltage levels and power sources across channels.

• Advanced Diagnostic Logic: Many Yokogawa modules feature line-monitoring functionality, enabling the system to detect field wiring issues like short circuits or open circuits even when the contact is open.

• Ruggedized Longevity: Designed with a long mechanical and electrical service life, often capable of exceeding millions of operations under standard industrial loads, and available with G3 conformal coating for corrosive gases.

Product Applications

These modules are implemented across heavy industries where signal integrity and physical isolation are paramount:

• Emergency Shutdown Systems: Interfacing with critical field-side trip switches, pushbuttons, and interlocks in oil, gas, and petrochemical facilities.

• Boiler and Furnace Safety: Monitoring flame detectors, fuel gas low-pressure switches, and high-temperature limits in power generation plants.

• Substation and Switchgear Monitoring: Tracking auxiliary contact positions of high-voltage circuit breakers and disconnect switches where massive electrical noise is present.

• Chemical Process Interlocks: Receiving status signals from specialized analytical instruments and explosion-proof field enclosures.

• Long-Distance Field Telemetry: Collecting discrete signals from remote pump stations or pipeline valves where long cable runs introduce significant induced voltages.

Important Precautions

To maintain safe operation and ensure maximum product lifespan, the following guidelines must be followed:

• Inductive Load Surge Suppression: When field contacts are connected to inductive devices like large solenoid valves or motor starter coils, external surge absorbers (such as RC snubbers for AC or flyback diodes for DC) must be installed to prevent arc-induced damage to the relay contacts.

• Minimum Wetting Current: Ensure that the external power source provides sufficient current to exceed the module's minimum wetting current requirement, which is necessary to break through surface oxidation on the field switch contacts over time.

• Correct Module Seating: Never force the module into the base unit slot. Inspect the backplane alignment pins before insertion to prevent bending the connector pins, which could cause permanent communication failure.

• Environmental Seal Integrity: If the module is deployed in an environment with high sulfur or chlorine gas concentrations, ensure the control cabinet maintains positive pressure or proper sealing to prevent chemical corrosion of the internal copper and silver contacts.

• Power Separation during Maintenance: Before disconnecting the field wiring arm or extracting the module for service, ensure the external loop power supply is completely shut off to avoid accidental sparking or short circuits in hazardous areas.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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Our main products include DCS control system spare parts, PLC system spare parts, and robot system spare parts. Our advantageous brands include Allen Bradley, Bently Nevada, ABB, HIMA, Reliance, Bender, National Instruments, Emerson Ovation, Honeywell, Siemens, Allen Bradley, ICS Triplex, FOXBORO, Schneider, GE Fanuc, Motorola, HIMA, Prosoft, and other imported industrial components. Our main products serve a wide range of electronic, metallurgical, chemical, and power plants Industries such as steel mills, rubber, cement, machinery and equipment, and construction.