Honeywell Enraf S0690915 FlexConn CAN PSS PCB Board

Honeywell Enraf S0690915 FlexConn (FlexCon) CAN PSS Printed Circuit Board Module

The Honeywell Enraf S0690915 is an internal communication and processing board belonging to the FlexConn (often designated FlexCon) modular instrumentation architecture. Specifically engineered as the CAN PSS (Power Supply & System / Communication) interface module, this assembly serves as the central operational backbone inside Honeywell Enraf’s custody-transfer tank inventory gauges, including the SmartRadar series and 854 Servo Gauge families.

In marine cargo monitoring, offshore storage units (FPSO/FSO), and land-based petrochemical tank terminals, the S0690915 module manages internal high-speed CAN bus arbitration, processes auxiliary sensor telemetry (multi-element spot temperature, bottom water interface, tank pressure), and converts local measurement loops into secure, field-proven Enraf GPU or serial data protocols. This board guarantees sub-millimeter level-gauging precision by isolating power delivery ripples and preventing electrostatic degradation across marine and hazardous zone terminal networks.

Model Details:

• Manufacturer: Honeywell Enraf (Delft, Netherlands)
• Product Line: FlexConn (FlexCon) Integrated Transducer Electronic Series
• Board Description: PCB Spare – CAN PSS (Power Supply / System Communication)
• Manufacturer Part Number (MPN): S0690915
• Alternative Factory Codes: S0690-915 / 0690.915 / S0690915-REV
• Functional Architecture: Multi-layer Surface Mount Technology (SMT) with conformally coated tracks, onboard intrinsic safety isolation barrier circuits, and dedicated CAN transceiver ICs for high-speed fieldbus synchronization.

Technical Specifications

Features

1. Deterministic CAN-Bus Telemetry: Executes real-time protocol arbitration across the internal FlexConn sensor bus, preventing communication packet collision between primary servo/radar transducers and secondary sensor sub-assemblies.
2. Integrated Intrinsically Safe (IS) Barrier Stages: Built with galvanically isolated input circuits designed to interface directly with tank-internal sensors (Vito probes, RTD Pt100 elements, water bottom sensors) without external signal conditioners.
3. Harsh-Environment Marine Conformal Coating: Factory-treated with high-grade elastomeric dielectric conformal coating to resist high humidity, marine salt spray, hydrocarbon vapors, and sulfur-bearing atmospheric corrosion.
4. Transient Voltage & Surge Suppression (TVS): Onboard clamp protection withstands line spikes, inductive switching surges, and electrostatic discharge (ESD) exceeding IEC 61000-4-5 standards.
5. Hot-Configurable Modular Alignment: Pre-calibrated fieldbus addressing enables swift replacement during scheduled dry-dockings or emergency refinery turnarounds, minimizing tank gauging downtime.

Frequently Asked Questions

Can the S0690915 board be replaced without recalibrating the tank gauge?

If swapping a damaged CAN PSS board on an existing 854 ATG or SmartRadar gauge, base mechanical tank parameters (such as tank reference height, gauge offset, and strapping tables) are primarily stored in non-volatile memory on the host CPU board or transmission controller. However, auxiliary calibration for connected temperature elements (Pt100/VITO probes) must be verified via the Enraf Portable Enraf Terminal (PET) or communications software after module installation to confirm zero-drift.

What are the symptoms of a failed S0690915 PCB module?

Typical failure modes include continuous CAN bus communication timeouts, intermittent “F-04 / Sensor Comm Error” warnings displayed on the transmitter faceplate, complete loss of secondary temperature telemetry while level values remain active, or an unrecoverable hardware lockup triggered by an internal DC power rail failure on the isolated secondary loop.

How do I verify whether I require part number S0690915 or S0690910?

The S0690915 features direct CAN-Bus communication transceivers engineered to support the multi-drop FlexConn serial interface architecture. Inspect the silkscreen printing on the green substrate near the main component array: units stamped “CAN PSS” correspond to S0690915. Standard “PSS” boards without CAN bus transceiver chips generally carry earlier revisions or alternate sub-assembly part codes (such as S0690910). Always match the primary OEM number on your vessel’s inventory technical card.

Is this board compatible with both 110V AC and 230V AC instrument variations?

Yes. The S0690915 functions inside the low-voltage regulated DC stage of the gauge housing. Host gauges receive either 110V AC, 230V AC, or optional 24V DC at their primary power transformer modules, which step down and condition the rail supply before distributing regulated voltage to this CAN PSS board.