Foxboro SMI983-I7EAAN Transmitting Transmitter

Description

Foxboro SMI983-I7EAAN Transmitting Transmitter

Product Dimensions：

The Foxboro (Eckardt) SMI983-I7EAAN is a high-precision electrical position transmitter designed to convert the linear or rotary movement of a valve actuator into a standard 4–20 mA electrical signal. It is widely used for position feedback in process automation, particularly in hazardous environments.

Product Detailed Description

The SMI983 series is a two-wire device that provides a non-reactive conversion of stroke position into a load-independent DC signal. The specific model SMI983-I7EAAN is characterized by its Intrinsically Safe certification and standard attachment kits for linear movement (NAMUR mounting).

Model Breakdown: SMI983-I7EAAN

• SMI983: Series code for Electrical Position Transmitter.
• I: Output signal range of 4 to 20 mA.
• 7: Cable entry via M20 x 1.5 plastic cable gland (Gray).
• EAA: Electrical certification for ATEX II 2 G Ex ia IIC T6 (Intrinsically Safe).
• N: Attachment kit included for standard diaphragm actuators.

Technical Parameters

Product Advantages

• Wear-Free Scanning: Utilizes a highly linear, conductive plastic precision potentiometer for long-term reliability without physical degradation.
• Easy Calibration: Features two integrated push-buttons and two LEDs for simple zero and span adjustment directly on the device.
• Flexible Feedback: Supports both direct and reverse feedback configurations to match various actuator requirements.
• Intrinsically Safe: Certified for use in Zone 1 hazardous areas, making it ideal for the oil, gas, and chemical industries.
• Compact Design: Small footprint with a movement amplification mechanism that makes it particularly suitable for actuators with small strokes.

Important Considerations (Precautions)

• Zener Barriers: Since this is an Ex ia (Intrinsically Safe) device, it must be powered through a certified safety barrier or galvanic isolator when installed in hazardous areas.
• Mounting Alignment: Ensure the feedback lever is correctly aligned with the actuator stroke to avoid mechanical binding and non-linear signal errors.
• Cable Glands: The “7” in the model indicates a plastic gland. For high-vibration or high-impact environments, ensure the gland is tightened correctly to maintain the IP65 rating.
• Reverse Polarity: While the device typically includes reverse polarity protection, always verify wiring before power-up to prevent internal circuit stress.

Product Applications

The SMI983-I7EAAN is used in any process industry where valve position feedback is required:

• Chemical & Petrochemical: Monitoring the exact opening of control valves in explosive atmospheres.
• Oil & Gas: Position tracking for remote actuators on pipelines or offshore platforms.
• Power Plants: Feedback for steam control valves and water regulation systems.
• Pulp & Paper: Ensuring precise valve positioning for chemical dosing and steam drying processes.

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