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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power provides original, factory-grade Triconex components to sustain your safety-instrumented infrastructure.

        3805H

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        The TRICONEX 3805H is an 8-channel TMR analog output module converting digital signals to 4-20mA current with 12-bit resolution and SIL 3 certification
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        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.
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        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 3805H

        • Manufacturer:
          Invensys
        • Part Number:
          3805H
        • Product Family:
          Triconex
        • Product Type:
          8-Channel TMR Analog Output Module
        • Stock:
          1
        • Channels:
          8 independent channels
        • Output Signal:
          4-20 mA (+6% overrange)
        • Resolution:
          12-bit
        • Accuracy:
          <0.25% of full scale
        • Architecture:
          Triple Modular Redundant (TMR)
        • Loop Power:
          24V DC nominal (42.5V DC max)
        • Load Capacity:
          Up to 1000 ohms
        • Operating Temperature:
          -40°C to +85°C
        • Communications:
          Modbus RTU, Modbus TCP/IP
        • Weight:
          2.16 kg
        • Estimated shipping dimensions:
          2.1x40.6x40cm
        • Tariff Code:
          8517795000
        • 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 Communication Safety & Compliance

        Features:

        • Triple redundancy with voting logic ensures continuous operation even with component failure
        • 12-bit resolution with <0.25% FSR accuracy for precise actuator and valve control
        • Meets IEC 61508 SIL 3 standard for safety-critical applications
        The 3805H is built upon a Triple Modular Redundant (TMR) architecture, featuring three independent processing paths that operate in parallel. Each of the 8 output channels is continuously monitored, and the module uses a voting mechanism to ensure the correct output signal is maintained even if one or more internal components fail. This design ensures deterministic behavior in the event of faults, making the 3805H ideal for safety-critical applications where system availability and integrity are paramount. The TMR architecture, combined with SIL 3 certification, enables the 3805H to meet the rigorous demands of emergency shutdown and fire and gas systems.

        The 3805H provides 8 independent analog output channels with a standard 4-20mA current range and an additional +6% overrange capability. With 12-bit resolution and output accuracy better than 0.25% of full scale, the module delivers fine-grained, precise control signals for a wide range of field devices, including control valves, actuators, and positioners. Each channel features independent isolation and calibration, supporting load capacities up to 1000 ohms at 24V DC loop power. This high precision makes the 3805H a trusted solution for demanding process control loops in oil and gas, chemical, and power generation industries.

        The 3805H complies with IEC 61508 SIL 3 standards, certifying it for use in safety instrumented functions (SIFs) and critical protection systems. Its robust design operates reliably from -40°C to +85°C, and it carries multiple international certifications including TUV, CE, CSA, and UL. The module supports hot-swapping, allowing replacement or maintenance without interrupting the process. Comprehensive built-in diagnostics, including open-circuit detection and loop integrity monitoring, are provided for each channel. The 3805H integrates seamlessly with Tricon and Trident safety systems, supporting Modbus RTU and Modbus TCP/IP communication protocols for flexible system configuration.

        The 3805H TRICONEX 8-Channel TMR Analog Output Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).

        TRICONEX 3805H 8-Channel TMR Analog Output Module Manuals, Datasheets, Drivers, 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 3805H 8-Channel TMR Analog Output Module Specs

        General

        • Manufacturer TRICONEX
        • Model 3805H
        • Condition New Original ready stock
        • Product Family 3504E,3505E,3700A
        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 Systems (ESD): Actuates safety valves to isolate process units during critical breaches.
        • Fire and Gas (F&G) Systems: Commands suppression systems, visual/audible alarms, and ventilation dampers upon hazard detection.
        • Turbine and Compressor Control: Drives the critical 4–20 mA actuator signals required for high-speed compressor anti-surge control and turbine speed throttling.
        • Internal TriBus Communication: The module continuously communicates with the main system processors via the proprietary high-speed TriBus backplane. The processors synchronize and pass output data to the module's three distinct internal legs.
        • Two-Out-Of-Three (2oo3) Output Voting: Output circuitry features final hardware voting mechanism. The three legs execute real-time comparison directly at the card stage. If one leg reports a deviant control signal, it is voted out dynamically without disrupting the physical 4–20 mA signal.
        • HART Protocol Pass-Through: The 3805H interfaces directly with secondary HART Interface Modules (such as the 2870H). This allows bi-directional highway addressable remote transducer digital communication to pass through the analog loop, enabling asset management systems to monitor instrument health.
        • IEC 61508 SIL 3 Certification: It is fully certified by TÜV Rheinland for use in Safety Integrity Level 3 (SIL 3) applications. Its hardware fault tolerance (HFT=1) ensures systematic safety integrity.
        • Comprehensive Loop Diagnostics: The module features microprocessor-controlled fault detection with loopback diagnostic coverage. It continuously reads back the actual physical output current and compares it to the ordered value. Any deviation triggers an immediate system alert.
        • Online Hot-Swapping: It supports non-disruptive hot-swap capability. Operators can slide a failed module out and insert a new 3805H into a companion slot online without stopping active processes or triggering a false trip.
        Description
        The TRICONEX 3805H is a high-performance analog output module designed for the Triconex Safety Instrumented System (SIS) platform. This module serves as a critical interface between the digital control system and field actuators, converting digital commands into precise 4-20mA analog signals.

        The TRICONEX 3805H features 8 independent analog output channels with a 4-20mA current range (+6% overrange) and 12-bit resolution, providing output accuracy better than 0.25% of full scale. The module operates on 24V DC loop power and supports load capacities up to 1000 ohms, enabling direct drive of actuators, control valves, and other field devices.

        The TRICONEX 3805H is built upon a Triple Modular Redundant (TMR) architecture, ensuring fault-tolerant operation even in the event of component failure. This redundancy is essential for meeting IEC 61508 SIL 3 safety integrity level requirements.

        The TRICONEX 3805H is fully compatible with Tricon and Trident safety systems, integrating seamlessly into existing SIS architectures. It supports multiple communication protocols including Modbus RTU and Modbus TCP/IP. The 3805H operates over a wide temperature range of -40°C to +85°C and carries multiple international certifications including TUV, CE, CSA, and UL.
        Alternative Names
        38O5H 3805E 3805EN 3625 3008 3504E 3511 3664
        Technical notes
        The TRICONEX 3805H is an 8-channel TMR analog output module for Triconex SIS platforms, converting digital signals to 4-20mA current with 12-bit resolution and <0.25% accuracy. Features TMR architecture, SIL 3 certification, hot-swap capability, and -40°C to +85°C operation. Used in ESD, F&G, and turbine control applications across oil, gas, and chemical industries.
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        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
        What is the primary function of the TRICONEX 3805H?
        It converts digital control signals into precise 4-20mA analog outputs to drive actuators, valves, and other field devices in safety instrumented systems.
        What is the accuracy and resolution of the 3805H?
        It offers 12-bit resolution with an output accuracy better than 0.25% of full scale.
        What redundancy architecture does the 3805H use?
        It uses Triple Modular Redundant (TMR) architecture, ensuring fault-tolerant operation and SIL 3 compliance.
        Can the 3805H be replaced while the system is running?
        Yes, it supports hot-swapping, allowing online replacement without system shutdown

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