Yokogawa SC42-SP24 Contact-Type Conductivity Sensor

Applications

The Yokogawa SC42-SP24 is a Contact-Type Conductivity Sensor designed for measuring the electrical conductivity of liquid process media. It is intended for industrial process applications where reliable conductivity measurement is required for water quality monitoring, chemical concentration control, and process optimization.

Contact-type conductivity sensors use electrodes in direct contact with the process liquid to determine its electrical conductivity. When combined with a compatible Yokogawa conductivity transmitter, the sensor can provide continuous measurement for process control and monitoring.

Typical applications include:

• Industrial water treatment
• Pure and process water monitoring
• Chemical process control
• Boiler and utility-water systems
• Cooling-water monitoring
• Wastewater treatment
• Rinse-water quality control
• Pharmaceutical and general process industries
• Conductivity-based concentration monitoring

The SC42-SP24 can be used as part of an online analytical measurement system where conductivity information is required for maintaining product quality, controlling chemical dosing, or detecting changes in process-water conditions.

Advantages

Direct Contact Conductivity Measurement

The sensor uses a contact-type measurement principle, allowing conductivity to be determined directly from the electrical properties of the process liquid.

Suitable for Continuous Process Monitoring

When installed with an appropriate conductivity transmitter, the sensor can support continuous monitoring rather than relying exclusively on manual sampling.

Broad Industrial Utility

Conductivity is a valuable process parameter in water treatment, chemical processing, utilities, and other industries. The sensor can therefore support a wide range of monitoring duties.

Practical Sensor Dimensions

With a specified length of 141 mm, the SC42-SP24 provides a compact sensing arrangement for installations where available mounting space needs to be considered.

Supports Process Quality Control

Conductivity changes can indicate variations in dissolved ionic substances, contamination, chemical concentration, or water quality. Monitoring these changes can help operators maintain stable process conditions.

Suitable for Yokogawa Analytical Systems

The sensor can form part of a Yokogawa analytical instrumentation solution when matched with compatible conductivity measurement equipment and the appropriate installation arrangement.

Technical FAQs

1. What is the Yokogawa SC42-SP24 used for?
The SC42-SP24 is a contact-type conductivity sensor used to measure the electrical conductivity of liquid process media.

2. How does a contact-type conductivity sensor work?
The sensor uses electrodes that contact the process liquid. The electrical response between the electrodes is used to determine the conductivity of the liquid.

3. What does conductivity indicate in a process liquid?
Conductivity reflects the ability of a liquid to conduct electrical current and is influenced by the concentration and mobility of dissolved ions.

4. What industries can use the SC42-SP24?
It can be applied in water treatment, chemical processing, utility-water systems, wastewater treatment, pharmaceutical processes, and other industrial applications requiring conductivity measurement.

5. Can the SC42-SP24 be connected directly to a PLC?
The sensor itself normally forms part of a conductivity measurement system. A compatible conductivity transmitter or analyzer can process the sensor signal and provide an appropriate output for integration with a PLC or control system.

6. Why is sensor compatibility important?
The sensor and transmitter must have compatible electrical characteristics and measurement configuration. Incorrect pairing can result in inaccurate conductivity readings or improper operation.

7. What can cause unstable conductivity readings?
Possible causes include air bubbles around the electrodes, fouling, contamination, poor electrical connections, unsuitable installation, process fluctuations, or problems with the associated transmitter.

8. How does sensor fouling affect conductivity measurement?
Deposits or contamination on the electrodes can alter the electrical path through the liquid and cause measurement errors. Regular inspection and appropriate cleaning are therefore important in demanding processes.

9. What should be checked before replacing an SC42-SP24?
The complete model number, sensor type, installation arrangement, process conditions, transmitter compatibility, and electrical connection should be verified before replacement.

10. How can conductivity measurement support process control?
Conductivity trends can be used to detect changes in water quality, chemical concentration, contamination, or other process conditions, allowing operators or control systems to take corrective action.