Yokogawa SC42-SP24 Wide Body Sensor

The Yokogawa SC42-SP24, also cataloged as the SC42-SP24 FU20 Wide Body Sensor, operates as a dedicated hardware component for electrolytic conductivity evaluation, localized fluid resistance tracking, and real-time ohmic measurement within process industrial loop networks. Configured as a heavy-duty 2-electrode flow insertion assembly, the solid-state sensor provides direct physical and electrochemical execution to track dissolved ion concentrations across continuous liquid transmission paths.

Hardware Specifications

Process Control & DCS Instrumentation Rails

• 4-20 mA HART Loop Protocol and Channel-to-Channel Isolation When connected to a matching Yokogawa field transmitter, the sensor's physical electrode loops remain completely isolated from adjacent plant power tracks. The system architecture enforces high-potential channel-to-channel isolation barriers that suppress common-mode electrical currents. This structural barrier shields the alternating-current excitation voltage from localized electromagnetic interferences, maintaining signal integrity on adjacent 4-20 mA HART loop networks.
• Cold Junction Compensation (CJC) and Signal Conversion Pathways Because this module functions strictly as an electrolytic conductivity sensor rather than a thermocouple assembly, it bypasses thermocouple-specific CJC hardware nodes. Instead, the integrated Pt1000 RTD sensor element reads localized process temperature fluctuations concurrently, routing resistance values straight to the conversion engine to execute automated automatic temperature compensation offsets at the hardware tier.

Frequently Asked Questions

Q: How does the fixed 0.1 cm-1 cell constant govern the measurement thresholds of the sensor?

A: The cell constant of 0.1 cm-1 defines the physical distance-to-area ratio of the integrated AISI 316L stainless steel electrodes. This precise geometry optimizes the current path lines for low-to-medium conductivity fluid monitoring, ensuring accurate resistance transformations without driving the primary conditioning circuits into saturation.

Q: What are the field maintenance restrictions when cleaning the PEEK insulation surfaces?

A: The PEEK and stainless steel wetted parts are mechanically rigid, but must be kept clean from biological films or chemical scaling. Field technicians should utilize mild chemical solutions rather than abrasive brushes; scratching the steel faces or deforming the PEEK insulation boundaries will alter the nominal cell constant value and distort system reading accuracy.