FCA4*B Yokogawa Pressure Measurement Module

The Yokogawa FCA4*B, also cataloged as the FCA4 Pressure Measurement Module, operates as a dedicated hardware component for dual-sensor pressure and differential pressure signal acquisition within Yokogawa CENTUM VP and CENTUM CS DCS networks.

Suffix Breakdown & Model Matrix

Hardware Specifications

FOUNDATION Fieldbus and 4-20 mA HART Loop Protocol Integration

The FCA4*B pressure measurement module integrates multi-protocol digital communication, supporting FOUNDATION Fieldbus, PROFIBUS DP, and 4-20 mA HART loop protocol standards. Internal signal conditioning circuitry converts analog millivolt, thermocouple, RTD, and 4-20 mA inputs from dual pressure sensors into calibrated digital output streams. Channel-to-channel isolation and integrated signal filtering suppress common-mode electrical noise and prevent ground loops, delivering deterministic process variable updates to CENTUM VP and CENTUM CS controllers.

Frequently Asked Questions

Q: Does the IP67-rated housing of the FCA4*B require additional field enclosures for outdoor mounting?

A: The IP67 metal housing provides direct resistance against dust ingress and low-pressure water jets, allowing direct field mounting; however, secondary shading is recommended in high-temperature environments subject to direct solar exposure.

Q: How are mixed sensor input types configured on the FCA4*B module?

A: Analog input selection across 4-20 mA, millivolt, thermocouple, and RTD signal sources is defined via system configuration software, which adjusts internal analog-to-digital scaling and cold junction compensation parameters per input channel.

Q: What power parameters must be met when energizing the module on a 24 VDC bus loop?

A: The power supply must maintain a stable 24 VDC output capable of supplying at least 10 W continuous power per module under full sensor excitation and active fieldbus transmission states.

Field Installation Guidelines

1. Mechanical Mounting: Secure the FCA4*B module to structural panels or mounting plates using M4 fasteners. Torque all mounting hardware to 2.5 N-m to maintain structural stability.
2. Gland Sealing: Cable entries must use IP67-rated metallic cable glands. Install sealed blind plugs in all unused cable entry ports to preserve the enclosure rating.
3. Shield Grounding: Connect signal cable drain wires directly to the main functional earth (FE) ground terminal on the module housing to suppress high-frequency electromagnetic interference.
4. Wiring Separation: Route 24 VDC power lines and high-frequency digital signal cables in separate wire ducts, maintaining a minimum 300 mm distance from 230 VAC power conduits.