Product Details
Configured for high-precision electrolytic conductivity measurement in industrial liquid handling networks, the Yokogawa SC42-SP24, also cataloged as the SC42 Contacting Conductivity Sensor, provides direct physical and electrical execution of process fluid interface detection.
Suffix Breakdown & Model Matrix
The Yokogawa SC42 conductivity sensor employs a structured suffix naming structure to specify wetted material composition, process connection type, cell constant, and electrode configuration.
| Suffix Position | Code | Parameter Selection / Technical Definition |
|---|---|---|
| Base Model | SC42 | Contacting Conductivity Sensor with integral Pt1000 RTD sensor |
| Material | -S | Wetted construction: Stainless steel AISI 316L and PEEK insulation |
| Mounting | P | Plug-in connector interface; intrinsically safe certified (ATEX/IECEx/FM) |
| Cell Constant | 2 | Nominal cell constant C = 0.1 cm-1 |
| Type | 4 | 2-electrode structure configured for flow cell installation |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SC42-SP24 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | Approx. 0.45 kg (1.0 lb) |
| Dimensions | 120 mm x 21 mm (4.72 in x 0.83 in) body diameter |
| Operating Temp | -20 to 135 deg C |
| Power Consumption | Passive sensor element (powered via external transmitter loop) |
| Measurement Type | Contacting conductivity, 2-electrode design |
| Cell Constant | C = 0.1 cm-1 |
| Wetted Materials | Stainless steel AISI 316L, PEEK |
| Temperature Element | Pt1000 Class A RTD |
| Process Connection | Plug-in type socket connector for flow cell adaptation |
| Max Operating Pressure | 10 bar at 25 deg C (145 psi at 77 deg F) |
| Ingress Protection | IP65 / NEMA 4X (when properly mated to cable connector) |
Process Control & DCS Instrument Characteristics
The SC42-SP24 sensor incorporates an integrated Pt1000 RTD element designed to deliver rapid dynamic temperature signals to downstream transmitter electronics for real-time automatic temperature compensation. Operating with a defined C = 0.1 cm-1 cell constant, the dual 316L stainless steel electrodes eliminate current fringing effects through targeted PEEK dielectric isolation. The hardware integrates seamlessly into 4-20 mA HART loop protocol transmitters and FOUNDATION Fieldbus / Profibus PA networks, providing high channel-to-channel isolation to prevent ground loop noise from degrading millivolt-level electrode feedback.
Frequently Asked Questions
Q: How does the cell constant (C = 0.1 cm-1) affect transmitter excitation frequency selection?
A: A cell constant of 0.1 cm-1 is optimized for low-to-medium conductivity process fluids. Downstream transmitters apply an alternating current (AC) voltage waveform across the electrodes, adjusting frequency dynamically to minimize polarization resistance and capacitive reactance at the electrode-liquid boundary.
Q: What precautions must be observed regarding the plug-in connector during field wiring?
A: The plug-in connector interface must remain free of moisture, oil, and conductive debris during assembly. Contamination across the high-impedance connector pins will degrade signal integrity and cause erroneous temperature compensation or conductivity drift readings on the DCS controller.
Field Installation Guidelines
- Inspect the 316L stainless steel electrode surfaces and PEEK body prior to installation. Ensure no oils or greases remain on the measuring surfaces; clean with isopropyl alcohol if necessary.
- Thread the sensor assembly into the dedicated flow cell using standard hand-tightening torque before applying a final 1/4 turn with a open-ended wrench. Do not overtighten to prevent damaging the internal seal face.
- Keep sensor cabling strictly separated from high-voltage AC lines, motor drives, and switching inductive loads to prevent high-frequency noise injection into the microvolt measurement circuit.
- Ensure the cable shield is grounded at a single point within the field transmitter terminal housing, maintaining a continuous floating shield along the sensor body run.
- Verify that the flow cell mounting orientation keeps the sensing surfaces continuously fully submerged under positive process liquid flow without entrapped air pockets.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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