Honeywell VITO 762 P/N 2074029-D03 Interface Module

Honeywell VITO 762 Interface Module (P/N: 2074029-D03) – Enraf Automatic Tank Gauging System

The Honeywell Enraf VITO 762 Interface Module (Part Number: 2074029-D03 / S0762950) is an intrinsically safe signal conversion and measurement unit engineered for high-precision bulk liquid inventory and custody transfer systems. Operating as the mission-critical link between tank-top measurement probes and automatic tank gauges (ATG), the 762 module acquires, processes, and digitizes signals from multi-element temperature probes (Pt100 RTDs) and capacitive water-bottom sensors.

The VITO 762 converts resistance and frequency measurements into digital HART or digital serial communication frames for transmission to Honeywell Enraf SmartRadar FlexLine (890/990 series), 854 ATG servo gauges, or field communication units. Its potting design delivers mechanical and galvanic isolation, protecting vulnerable processing circuitry against tank vapors, thermal expansion stresses, and marine atmospheric corrosion.

Model Details

• Manufacturer: Honeywell Enraf (Delft, Netherlands)
• Model Designation: VITO 762 Interface
• Manufacturing Part Number (MPN): 2074029-D03
• Assembly / Serial Reference: S0762950 / 0762.601 / 2074029-D2 / 4482560-D3
• Hardware Revision: Rev. 03 / D3

Features

1. Integrated Water-Bottom & Interface Level Conversion: Seamlessly reads high-resolution capacitance signals from VITO bottom-water probes (765/766/768 series) to detect free water accumulation down to 0.1 mm resolution.
2. Galvanically Isolated Intrinsically Safe (Ex i) Architecture: Certified for continuous deployment in Zone 0 / Class I, Division 1 hazardous areas when powered through compatible Enraf barrier circuits.
3. Digital 2-Wire Fieldbus Loop Powered: Utilizes bi-directional serial/HART digital communication modulated over a 2-wire transmission circuit, simplifying tank-top electrical cable runs.
4. Marine & Petrochemical Grade Encapsulation: Hermetically coated and resin-potted assembly resistant to vibration, severe condensation, salt mist spray, and ambient temperature extremes (-40°C to +60°C).

Supported Tank Gauges & Process Transmitters:

• Honeywell Enraf Radar Gauges: SmartRadar FlexLine Series (890 / 990 / 990 SmartRadar), Series 97x, and Series 873.
• Servo Tank Gauging Systems: Honeywell Enraf 854 ATG and 854 XTG Servo Gauges.
• Data Processing & Field Units: Enraf 762 Junction Housing, 880 CIU (Communication Interface Unit), and Entis Inventory Management Systems.

Part Number Cross-References

• Honeywell OEM Reference: 2074029-D03
• Alternative Revision Code: 2074029-D2 / 2074029-D3
• Production / Kit Number: S0762950
• Alternative Assembly Code: S0762970 / UT762IAGA/T
• Internal Motherboard PCB Trace: 0762.601 / 0181350 D2 / 4482560-D3

Marine & Industrial Applications

• Crude Oil Tankers (VLCC / Suezmax / Aframax): Cargo tank monitoring system (CTMS) temperature averaging and interface monitoring.
• Chemical & Product Tankers: Closed tank inventory calculation with high vapor pressure/toxic chemical containment.
• LNG / LPG Gas Carriers: Secondary cryogenic thermal stratification and insulation efficiency tracking.
• Commercial Oil Terminals & Refineries: Fiscal custody transfer verification across fixed-roof, floating-roof, and pressurized storage spheres.
• Offshore FPSO / FSO Units: Production cargo tank level, boundary, and stratified density corrections.

Frequently Asked Questions

What is the core function of the Honeywell VITO 762 Interface Module?

The VITO 762 interface module acts as the measurement engine that converts electrical signals from multi-element temperature probes and water-bottom level sensors installed inside storage tanks into standardized digital data packets readable by Honeywell Enraf tank gauging systems.

Can the VITO 762 (2074029-D03) replace older revisions such as 2074029-D2?

Yes. The 2074029-D03 is a direct form, fit, and functional replacement for earlier production revisions, including the 2074029-D2. Terminal allocations, physical mounting dimensions, and firmware communication protocols are backward compatible.

Does this interface module require external AC mains power?

No. The VITO 762 is entirely loop-powered by the connected host device (such as the Honeywell Enraf 854 ATG Servo or SmartRadar FlexLine) via an intrinsically safe two-wire field communication line operating between 10.5 V DC and 30 V DC.

How does the unit calculate average product temperature?

The unit reads individual Pt100 resistance elements spaced vertically along the tank height. In coordination with the liquid surface level transmitted by the host tank radar or servo, the system dynamically excludes elements located in the vapor space and averages only the fully submerged sensor spots to calculate true product inventory temperature.

Is calibration required before commissioning a replacement module?

The VITO 762 arrives factory calibrated across its internal analog-to-digital converter channels. Once connected, tank parameters, probe length, element spacing, and address configurations must be assigned or verified using Enraf Tank Gauging Configuration Software (Ensite) or via the host gauge’s display terminal.