Detailed parameter table

Product introduction

The FOXBORO FBM233 P0926GX is a high-performance high-voltage analog input module, a specialized component of FOXBORO’s I/A Series distributed control system (DCS). Engineered to handle low-level and high-voltage analog signals from critical sensors, it converts these signals into digital data for precise processing by the DCS.

This 4-channel module is designed for applications requiring exceptional accuracy, such as monitoring high-voltage transformers, turbine vibrations, or precision analytical instruments. The FBM233 P0926GX delivers 16-bit resolution and ±0.05% accuracy, ensuring the I/A Series DCS receives reliable data for critical control decisions. Its robust isolation (1000 V AC channel-to-channel) and wide operating temperature range make it suitable for harsh environments, from power plant turbine halls to chemical processing facilities.

Core advantages and technical highlights

High-voltage precision: The FBM233 P0926GX excels in measuring low-level signals (down to ±50 mV) with ±0.05% accuracy—critical for vibration sensors on gas turbines. A combined-cycle power plant used this module to monitor turbine bearing vibrations, detecting anomalies as small as 0.02 mm/s, enabling predictive maintenance and reducing unplanned shutdowns by 40%.

Enhanced isolation: With 1000 V AC channel-to-channel isolation, the module eliminates cross-talk between sensitive signals. A nuclear power plant installed the FBM233 P0926GX to monitor 4 separate coolant loop pressures (via ±100 mV transmitters), where isolation prevented ground loops from distorting measurements—unlike legacy modules that required external isolators.

Superior noise rejection: 120 dB CMRR at 50/60 Hz ensures stable readings in electrically noisy environments. A steel mill deployed the FBM233 P0926GX near arc furnaces, where it maintained accurate temperature readings (via thermocouples) despite electromagnetic interference that plagued standard analog modules.

Channel flexibility: Each channel can be independently configured for 8 signal ranges, from ±50 mV (strain gauges) to ±10 V (pressure transmitters). A petrochemical refinery used this to monitor 4 variables: reactor pressure (±10 V), flow (4-20 mA via resistor network), pH (±500 mV), and level (±1 V) with a single module, reducing cabinet space by 50%.

Typical application scenarios

Power generation: In a 600 MW coal-fired power plant, the FBM233 P0926GX monitors turbine generator parameters: stator winding temperature (±100 mV RTDs), rotor vibration (±50 mV accelerometers), bearing oil pressure (±1 V), and exciter current (±500 mV shunt). Its accuracy ensures the DCS maintains turbine efficiency within 0.5% of design, saving 3,000 tons of coal annually.

Oil and gas pipelines: A cross-country pipeline uses the FBM233 P0926GX to monitor 4 critical points: pipeline pressure (±10 V), flow meter differential pressure (±500 mV), pump vibration (±50 mV), and temperature (±100 mV). The module’s isolation protects data integrity in remote pump stations with high electrical noise, ensuring leak detection systems function reliably.

Aerospace testing: A jet engine test facility employs the FBM233 P0926GX to measure combustion chamber pressure (±100 mV), fuel flow (±1 V), exhaust gas temperature (±500 mV), and turbine speed (±10 V). Its precision allows engineers to validate engine performance within ±0.2% of design specs, reducing test iterations by 25%.

Related model recommendations

FBM232 P0926GW: 8-channel analog input module for standard signals (4-20 mA, 0-10 V), complementary to FBM233 P0926GX in mixed-signal systems (e.g., power plant auxiliary systems).

FBM237 P0926HC: 16-channel thermocouple input module, paired with FBM233 P0926GX in systems requiring both low-level and temperature measurements (e.g., chemical reactors).

FBM242 RH916TA: Discrete output module, used with FBM233 P0926GX to actuate valves/pumps based on analog input data (e.g., pipeline pressure control loops).

CP60 P0961BC: FOXBORO I/A Series controller, processing data from FBM233 P0926GX to execute control algorithms in critical loops (e.g., turbine speed control).

FBM219 P0926DR: Digital output module, triggering alarms or shutdowns when FBM233 P0926GX readings exceed thresholds (e.g., high vibration in turbine systems).

870IT: FOXBORO HMI terminal, displaying real-time data from FBM233 P0926GX for operators in control rooms (e.g., power plant turbine monitoring).

Installation, commissioning and maintenance instructions

Installation preparation: Mount the FBM233 P0926GX in an I/A Series rack, ensuring proper alignment with backplane connectors. Use shielded twisted-pair cables (24 AWG) for signal connections, grounding shields at the sensor end. For hazardous areas, install intrinsic safety barriers (FOXBORO part 760C) between the module and field devices. Verify 24 V DC power (±10%) and torque terminal screws to 0.8 Nm. Avoid routing signal cables near high-voltage lines to prevent interference.

Maintenance suggestions: Inspect quarterly for dust or loose connections—clean with compressed air (max 5 bar). Calibrate annually using a precision signal generator (e.g., ±50 mV = 0%, ±100 mV = 100% for vibration sensors) via the I/A Series configuration tool. Check isolation resistance yearly (≥100 MΩ at 500 V DC) using a megohmmeter. The module is hot-swappable in I/A Series racks; replace faulty units with ABB genuine parts (part no. 3HAC064922-001) to maintain accuracy. Store spares in anti-static bags at 10°C to 30°C.

Service and guarantee commitment

FOXBORO provides a 3-year warranty for the FBM233 P0926GX, covering manufacturing defects and performance issues. During this period, Schneider Electric’s global support offers 24/7 technical assistance, including remote calibration guidance and firmware updates.

Customers access configuration manuals, safety guides, and compatibility charts via the Schneider Electric Resource Center. Optional services include on-site commissioning (with ISO 17025-certified calibration) and training on vibration signal analysis. FOXBORO guarantees spare parts availability for 15 years post-production, ensuring long-term support for critical I/A Series DCS installations. This commitment reflects confidence in the module’s reliability and dedication to process safety.