The Yokogawa FP201A-L31, also cataloged as the FP201A High-Accuracy Pressure Transmitter, operates as a dedicated hardware component for localized pressure sensing and process variable conversion within industrial control networks.

Hardware Specifications

Process Control and Loop Integrity

The FP201A-L31 is designed for compatibility with 4-20 mA HART loop protocol standards, allowing seamless integration into existing DCS infrastructure. The transmitter utilizes a Hastelloy C diaphragm to maintain measurement stability against corrosive process fluids. To ensure signal accuracy, the device architecture incorporates internal compensation for temperature drift, rated at +/- 0.02% of span per deg C. Furthermore, the use of SUS316 for connection materials provides mechanical resistance against process-induced fatigue, supporting long-term reliability in varying pressure environments.

Frequently Asked Questions

Q: Can the FP201A-L31 be used for absolute pressure measurement in vacuum applications?

A: Yes, provided the specific model variant is configured for absolute pressure. The sensor is rated for 0 to 10 MPa absolute, making it suitable for both pressurized and vacuum-based process monitoring within that span.

Q: Is the IP66 protection rating maintained if the electrical conduit is not sealed?

A: No. The IP66 rating requires the cable entry to be properly sealed using appropriate cable glands or conduit seals. Failure to seal the entry point will compromise the ingress protection of the transmitter housing.

Field Installation Guidelines

• Mounting: Ensure the transmitter is mounted vertically to prevent sediment buildup on the diaphragm. Use a manifold valve assembly for isolation during zero-point calibration and maintenance.
• Wiring: Maintain a dedicated shield connection for the 4-20 mA signal line to minimize electromagnetic interference. The cable shield must be grounded at the control cabinet end only.
• Thermal Management: While the unit is rated for operation up to 80 deg C, avoid direct mounting on high-temperature process piping without an appropriately sized pigtail or impulse line to dissipate heat.
• Zero Calibration: Perform a zero-check after installation to ensure that the process-side hydrostatic head pressure is accounted for in the initial calibration baseline.