Configured for continuous analytical measurement in liquid process streams, the Yokogawa FU20-05-T1-NPT (FU20-05-T1-NPT Wide Body Sensor) provides direct physical contact for pH and ORP potential detection within industrial pipework or bypass loops.

Suffix Breakdown & Model Matrix

• FU20: Base wide-body sensor model identifier.
• 05: Defined cable length of 5 meters.
• T1: Integrated temperature sensor (Pt1000) for compensation.
• NPT: Standardized NPT process connection threading.

Hardware Specifications

Electrode Scaling and Potentiometric Performance

The FU20-05-T1-NPT sensor assembly utilizes a solid-state electrolyte junction to minimize fouling and reference poisoning in high-particulate process media. The potentiometric output requires high-impedance amplification, facilitated by the integrated Pt1000 temperature element which provides real-time slope compensation. This integration suppresses measurement drift and maintains Nernstian response stability in variable-temperature streams.

Frequently Asked Questions

Q: Is the internal Pt1000 sensor compatible with non-Yokogawa transmitters?

A: The Pt1000 element follows standard resistance-temperature characteristics (IEC 60751). It is electrically compatible with any process transmitter capable of accepting a 2-wire Pt1000 input; ensure the transmitter is correctly configured for the specific resistance range and cable impedance.

Q: Can the NPT threads be used for submersion applications?

A: While the NPT threads provide a secure mechanical mount for pipe installation, submersion requires additional protection for the cable entry point. Ensure the sensor is installed with a dedicated submersion assembly to prevent moisture ingress at the cable-to-sensor junction.

Field Installation Guidelines

1. Perform a multi-point buffer calibration before installation to verify electrode slope and offset consistency.
2. Install the sensor in a vertical or inclined position (at least 15 degrees above the horizontal) to ensure the internal reference electrode remains in contact with the electrolyte gel.
3. Apply Teflon-based thread sealant to the 3/4 inch NPT threads, ensuring the sensor is hand-tightened followed by a quarter-turn with a wrench; do not over-torque to avoid damaging the sensor body.
4. Route the 5-meter cable through flexible, liquid-tight conduit to protect it from mechanical abrasion and process chemical exposure.
5. In high-flow environments, verify that the sensor is not placed in a location subject to excessive turbulence, which could induce measurement noise and physical vibration fatigue.