• Please try to be as accurate as possible with your search.
  • We can quote you on 1000s of specialist parts, even if they are not listed on our website.
  • We can't find any results for “”.
    SEE MORE
      SEE PRODUCTS IN SEARCH PAGE ()
      info@apterpower.com
      +86 181 0690 9650
      Request a

      Fast Quote

      Manufacturers
      ALL MANUFACTURERS
      • Please try to be as accurate as possible with your search.
      • We can quote you on 1000s of specialist parts, even if they are not listed on our website.
      • We can't find any results for “”.
        Manufacturers
        info@apterpower.com +86 181 0690 9650
        Choose a manufacturer
        ALL MANUFACTURERS
        Triconex 3351
        Triconex 3351
        Triconex 3351
        Triconex 3351
        Triconex 3351
        Triconex 3351
        Ask our team:
        • Phone: +86 181 0690 9650
        • E-Mail info@apterpower.com

        3351 (AI3351)

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Triconex 3351 is a 32-point commoned analog input module designed for 4–20 mA DC signal acquisition with triple-channel architecture and high-precision digital conversion. It ensures reliable measurement, diagnostics, and fault-tolerant operation for industrial control systems requiring continuous analog monitoring.
        Get a quick price for 3351 (AI3351)
        Quantity
        *E-mail
        Company
        *Mobile
        *Content
        Upload (gif, jpg, jpeg, png, bmp, doc, docx, xls, xlsx, ppt, pdf, csv)
        Get a Quote
        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 3351 (AI3351)

        • Manufacturer:
          Invensys
        • Part Number:
          3351 (AI3351)
        • Product Family:
          Triconex
        • Product Type:
          Analog Input Module
        • Points:
          32, commoned
        • Nominal input current:
          4–20 mA DC
        • Operational current range:
          2–22 mA DC
        • Absolute maximum field voltage:
          33 V DC
        • Absolute maximum reverse field voltage:
          – 0.6 V DC
        • Absolute maximum input current:
          50 mA DC
        • Input bandwidth (3dB):
          16 Hz
        • Source impedance:
          180 Ω
        • Input impedance (with baseplate):
          250 Ω I to V resistor 100 Ω, ±0.01%
        • Resolution:
          12 bits
        • Absolute error:
          0.15% of full scale (20 mA)
        • Diagnostic:
          Force-to-value diagnostic (FVD)
        • Scan time:
          <1 ms for all 32 points
        • Functional-to-protective-earth isolation:
          500 V DC, minimum
        • Functional-to-functional-earth (logic) isolation:
          800 V DC, minimum
        • Weight:
          1.28 kg
        • Estimated shipping dimensions:
          4.5x18.8x21.7cm
        • Tariff Code:
          8537101190
        • Country of origin:
          USA
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Application Scenarios Installation Standards

        Features:

        • Triple independent input channels with mid-value selection ensure stable and validated signal processing
        • High-resolution 12-bit conversion with low full-scale error enhances measurement precision
        • Continuous diagnostics with fault isolation support reliable operation under single or multiple faults
        The Triconex 3351 analog input module is designed for industrial systems requiring high-density analog signal acquisition. With 32 commoned input points, the 3351 efficiently handles multiple 4–20 mA DC signals while maintaining stable conversion performance. Its architecture allows the 3351 to support complex process monitoring tasks where consistent data acquisition is required.

        The internal design of the 3351 is based on three independent input channels that process incoming voltage signals separately. Each channel converts signals into digital values and transmits them to processing modules, where the 3351 applies a mid-value selection method to ensure accurate results. This structure allows the 3351 to maintain data integrity even when one channel experiences failure.

        From a reliability perspective, the 3351 continuously performs diagnostic functions across all channels to detect abnormalities. Fault conditions are isolated at channel level, ensuring the overall module remains operational under single or multiple fault scenarios. With fast scan performance and electrical isolation features, the 3351 supports stable operation in demanding industrial environments.

        The 3351 Triconex Analog Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Triconex 3351 Analog Input Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        Triconex 3351 Analog Input Module Specs

        General

        • Manufacturer Triconex
        • Model 3351
        • Condition New Original ready stock
        • Product Family 2351,2352,2201
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Emergency Shutdown: Performs ESD emergency shutdown tasks in oil and gas production, monitoring pressure and flow anomalies.
        • Flame and Gas Monitoring: Serves as an input unit for the Flame and Gas (F&G) system, connecting to smoke and toxic gas sensors.
        • Boiler Protection: Integrated into the Burner Management System (BMS), monitoring key analog parameters of boiler operation.
        • Turbine Control: Used in Turbomachinery Control (TMC) to achieve high-precision signal monitoring and protection for rotating equipment.
        • Baseplate Fixing: The module must be inserted into a dedicated I/O baseplate slot; either the left or right side can be used as the working position.
        • Terminal Connection: Connect to an external terminal block (ETP) via the baseplate's interface to complete field instrument wiring.
        • Online Replacement: Supports hot-swapping, allowing module replacement without interrupting logic power.
        • Spare Parts Deployment: Hot-spare modules can be installed in unused slots for seamless failover.
        • Safety Certification: Designed to comply with IEC 61508 international standards, meeting SIL 3 safety requirements.
        • Industry Standards: Widely used in control systems compliant with nuclear power and process industry safety regulations.
        • Isolation Protection: Circuit design meets 500V DC isolation strength and industrial interference immunity standards.
        • Environmental Compliance: Component selection follows stringent industrial environmental standards, ensuring long-term stability under harsh operating conditions.
        Description
        The Triconex 3351 analog input module is designed with 32 commoned input points for handling 4–20 mA DC signals in industrial environments. The 3351 operates within an input range of 2–22 mA DC and supports a maximum field voltage of 33 V DC with a reverse field voltage limit of –0.6 V DC. With an absolute input current limit of 50 mA DC, the 3351 is structured to maintain stable electrical handling of incoming field signals.

        The 3351 integrates three independent input channels, each processing voltage signals from individual points and converting them into digital values. These values are transmitted to three MPs on demand, where the 3351 applies a mid-value selection algorithm to ensure accurate scan output. This structure allows the 3351 to isolate channel behavior so that a single-channel failure does not affect other channels, improving system stability.

        The Triconex 3351 provides a 12-bit resolution with an absolute error of 0.15% of full scale at 20 mA, ensuring high-accuracy signal conversion. The module supports a 16 Hz (3 dB) input bandwidth, a 180 Ω source impedance, and a 250 Ω input impedance when used with the baseplate. The 3351 also includes a 100 Ω I-to-V resistor with ±0.01% accuracy, supporting precise current-to-voltage conversion.

        The 3351 performs continuous diagnostics through Force-to-Value Diagnostic (FVD) functions across all channels. The module scan time is less than 1 ms for all 32 points, enabling fast system-wide data refresh. If a fault is detected, the 3351 activates a fault indicator identifying channel-level issues while maintaining module operation under single or multiple fault conditions.

        The Triconex 3351 supports hot sparing functionality, allowing online replacement or continuous backup operation without interrupting system performance. The module is mechanically keyed to prevent incorrect installation into a configured baseplate. With functional-to-protective-earth isolation of 500 V DC and functional-to-functional-earth isolation of 800 V DC, the 3351 maintains controlled electrical separation for stable operation.
        Alternative Names
        2351 2352 3481 3301 3482
        Technical notes
        Triconex 3351 analog input module provides 32 commoned points with 4–20 mA DC nominal input current, 2–22 mA DC operational range, 33 V DC maximum field voltage, –0.6 V DC reverse field voltage limit, 50 mA DC maximum input current, 16 Hz (3 dB) input bandwidth, 180 Ω source impedance, 250 Ω input impedance (with baseplate), 100 Ω I-to-V resistor ±0.01%, 12-bit resolution, 0.15% full-scale error at 20 mA, Force-to-value diagnostic (FVD), <1 ms scan time for all 32 points, 500 V DC functional-to-protective-earth isolation, and 800 V DC functional-to-functional-earth isolation.
        Exceptional Service

        Our Mission

        • 100% Satisfaction

          We believe expertise is priceless. With over 20 years of experience, and top engineers on staff, we can help you solve or avoid problems that threaten your business.

        • Trust Guaranteed

          Not only do we have a vast inventory, our team makes sure every piece of equipment is in working condition. Your purchases are also backed by our Warranty.

        • Expertise

          Time is money, especially when your equipment is down. We work quickly to get your equipment on its way so you can get it back up and running.

        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        How does Triconex 3351 ensure measurement accuracy?
        It uses a mid-value selection algorithm and provides 12-bit resolution with 0.15% full-scale error at 20 mA.
        What happens when a fault occurs in one channel of the 3351?
        A fault indicator is activated for that channel, while the module continues operating normally under fault-tolerant conditions.
        How does Triconex 3351 handle diagnostic monitoring?
        It performs continuous Force-to-Value Diagnostics (FVD) across all channels to detect and report failures.

        You May Also Like

        Product Browsing History

        Triconex 3351
        Triconex 3351
        Triconex 3351
        Triconex 3351
        Triconex 3351
        Triconex 3351