Honeywell S0690964 FlexCon PCB Set

Honeywell S0690964 FlexCon PCB Set: SIL-2 Upgrade Kit

The Honeywell S0690964 FlexCon PCB Set: SIL-2 Upgrade Kit is an OEM functional safety hardware retrofit assembly engineered for the Honeywell Enraf FlexLine Automatic Tank Gauging (ATG) platform. Designed to integrate directly into the modular FlexConn backplane architecture, this kit upgrades standard non-SIL FlexLine radar and servo tank gauges into certified Safety Instrumented System (SIS) overfill and underfill protection devices.

By adding dedicated safety-rated Field Interface Instrument (FII-SIL / CAN-SIL) circuit boards to the gauge’s electronics compartment, the S0690964 kit enables continuous hardware diagnostics, redundant safety voting, and failsafe relay shutdown signaling without requiring a full tank gauge replacement.

Model Details

• Manufacturer: Honeywell Process Solutions / Honeywell Enraf
• Manufacturer Part Number (MPN): S0690964
• System Series: Enraf FlexLine Gauging Series (FlexConn Architecture)
• Functional Module Designation: FII-SIL (Field Interface Instrument – Safety Integrity Level) / CAN-SIL
• Safety Function: Maximum Filling Level Detection (Overfill Protection) & Minimum Level Detection (Underfill Protection)

Technical Specifications

Features

1. IEC 61508 & IEC 61511 SIL-2 Compliance: Upgrades existing FlexLine tank gauges to execute TÜV-certified overfill and underfill safety shutdown functions in a single-channel (HFT = 0) architecture.
2. Dual Failsafe Digital Shutdown Outputs: Provides two independent, galvanically isolated safety relay contacts (DO1 across Terminals 54–55 and DO2 across Terminals 56–57) engineered to de-energize to trip (fail-safe state) upon high-high level detection or internal fault.
3. Continuous 1-Second Self-Diagnostics: Executes automated internal health and safety loop verification every second, isolating hardware faults and reporting real-time status entities (Safety Function Status and Contact Health) to the control room.
4. Native FlexConn Plug-and-Play Integration: Mounts directly onto the internal FlexConn bus of the 990 SmartRadar or 954 SmartServo without altering external tank-top process connections or fieldbus cabling.
5. Extended >10-Year Proof Test Interval: Engineered with high diagnostic coverage to minimize manual proof-testing frequency, reducing vessel dry-dock and terminal tank downtime.

Compatible Equipment Models

• Honeywell Enraf 990 SmartRadar FlexLine (All antenna configurations: Horn, Planar PAT, Stilling Well, and High-Pressure variants)
• Honeywell Enraf 954 SmartServo FlexLine (Custody transfer and inventory servo-operated level gauges)
• Configuration & Service Interfaces: Compatible with the local HART SmartView tank-side display and Honeywell Engauge service software for entity commissioning and password-protected safety parameter locking.

Applications

• FPSO, FSO & Tanker Cargo Overfill Protection: Independent high-high level (98% / 99% cargo tank capacity) emergency shutdown (ESD) signaling to close hydraulic cargo loading valves on crude carriers, LNG/LPG carriers, and chemical tankers.
• Marine Bunker & Fuel Oil Storage Tanks: Automated overfill prevention on double-hull marine fuel oil and diesel service/storage tanks to comply with MARPOL and classification society safety rules.
• Refinery & Petrochemical Tank Farms: SIL-2 safety instrumented loops for bulk liquid hydrocarbons, solvents, and pressurized spheres.
• Bulk Liquid Marine Terminals: Integration into terminal automation systems for custody transfer tanks requiring certified DIBt WHG / TÜV overfill prevention.

Frequently Asked Questions

What is included in the Honeywell S0690964 FlexCon PCB Set: SIL-2 Upgrade Kit?

The Honeywell S0690964 kit contains the factory-matched FlexConn safety interface printed circuit board assembly (FII-SIL / CAN-SIL) and mounting hardware required to upgrade a standard Honeywell Enraf FlexLine tank gauge to SIL-2 certified overfill and underfill protection.

Which Honeywell Enraf gauges are compatible with part number S0690964?

The S0690964 upgrade kit is compatible with the Honeywell Enraf 990 SmartRadar FlexLine and the Honeywell Enraf 954 SmartServo FlexLine automatic tank gauges utilizing the modular FlexConn internal electronics architecture.

How are the safety relay outputs wired on the FII-SIL module?

The FII-SIL board uses four dedicated screw terminals on the FlexLine terminal block: Terminal 54 (DO1_a) and Terminal 55 (DO1_b) for Digital Output 1, and Terminal 56 (DO2_a) and Terminal 57 (DO2_b) for Digital Output 2. Each contact is rated up to 2 A at 250 VAC or 40 VDC (500 W maximum) and operates in a fail-safe normally energized (closed when healthy) state.

What is the difference between S0690964 and S0690617?

S0690964 is the complete FlexCon PCB Set: SIL-2 Upgrade Kit used to retrofit a non-SIL FlexLine gauge into a SIL-2 safety configuration. S0690617 is the standalone FlexConn PCB Spare: FII-SIL circuit board ordered as a direct one-for-one replacement part for gauges that already have the SIL-2 option installed and commissioned.

Can the S0690964 upgrade kit be used for SIL-3 applications?

In a single-board, single-gauge configuration (Hardware Fault Tolerance HFT = 0), the S0690964 FII-SIL upgrade provides SIL-2 certification per IEC 61508 and IEC 61511. Achieving SIL-3 (HFT = 1) requires a redundant hardware architecture (such as dual-gauge or redundant 2oo4D configurations) as specified in the Honeywell Enraf FlexLine Safety Manual.