Foxboro 871EC-SP0 Electrodeless Conductivity Sensor: A Comprehensive Guide

Electrodeless conductivity sensors are essential tools in modern industrial processes. Unlike traditional conductivity sensors that rely on electrodes, which can become fouled or corroded over time, electrodeless sensors use a toroidal design to measure conductivity without direct contact with the solution. This makes them ideal for harsh environments where other sensors might fail. The Foxboro 871EC-SP0 is a prime example of such a sensor, offering reliability and accuracy in challenging conditions.

In this article, we will delve into the technical parameters of the Foxboro 871EC-SP0, explore its various industry applications, and examine related models within the 871EC series. Whether you are an engineer, a process manager, or simply interested in industrial sensors, this guide will provide you with valuable insights into this versatile sensor.

Overview of the Foxboro 871EC-SP0

The Foxboro 871EC-SP0 is an electrodeless conductivity sensor designed for use in a wide range of industrial applications. It is part of the 871EC series, known for its durability and precision. The sensor is constructed from PEEK (Polyetheretherketone), a thermoplastic material that offers excellent strength and chemical resistance, making it suitable for corrosive environments.

One of the key advantages of the 871EC-SP0 is its electrodeless design. Traditional conductivity sensors use electrodes that are in direct contact with the solution, which can lead to issues such as fouling, corrosion, and inaccurate readings over time. In contrast, the 871EC-SP0 uses a toroidal design, where two or three toroidally wound coils are encapsulated within the sensor. When an AC signal is applied to one coil, it induces a current in the second coil, which is proportional to the conductance of the solution. This design eliminates the need for electrodes, reducing maintenance and extending the sensor’s lifespan.

Additionally, the 871EC-SP0 is compatible with a variety of Foxboro analyzers and transmitters, including the 875EC Intelligent Analyzers, 870ITEC Intelligent Transmitters, 873EC and 873AEC Analyzers, and 870EC Transmitters. This compatibility ensures that the sensor can be easily integrated into existing systems, providing flexibility and ease of use.

Technical Parameters of the Foxboro 871EC-SP0

Understanding the technical specifications of the Foxboro 871EC-SP0 is crucial for selecting the right sensor for your application. Below, we outline the key parameters of this sensor.

Physical Characteristics

• Sensor Body Material: PEEK (Polyetheretherketone)
• Dimensions: [Insert dimensions if available]
• Weight: [Insert weight if available]
• Mounting Options: Various mounting accessories are available, including flanges, Tri-clamp kits, and ball valve assemblies.

Electrical Characteristics

• Measurement Principle: Electrodeless (toroidal) conductivity measurement
• Temperature Element: 100 kΩ thermistor
• Compatibility: Works with 875EC Intelligent Analyzers, 870ITEC Intelligent Transmitters, 873EC and 873AEC Analyzers, and 870EC Transmitters

Environmental Ratings

• Temperature Limits: -5 to +120°C (20 to 250°F)
• Pressure Limits: Dependent on mounting and application; consult manufacturer for specific limits
• Chemical Resistance: Excellent resistance to corrosive chemicals due to PEEK construction

Performance Specifications

• Measurement Range: Wide range suitable for both low and high conductivity solutions
• Sensitivity: High sensitivity for detecting small changes in conductivity
• Accuracy: Provides accurate and reliable measurements even in challenging conditions

For a complete list of technical specifications, please refer to the official Foxboro documentation or visit our products page.

Industry Applications of the Foxboro 871EC-SP0

The Foxboro 871EC-SP0 is used across various industries due to its robustness and ability to perform in harsh environments. Below, we explore some of the key industries and applications where this sensor excels.

Chemical Processing

In the chemical processing industry, the 871EC-SP0 is used to monitor the conductivity of solutions in reactors, pipelines, and storage tanks. Its resistance to corrosion and fouling makes it ideal for handling aggressive chemicals such as acids, caustics, and saline solutions. For example, in a plant producing hydrochloric acid, the sensor can provide accurate measurements despite the highly corrosive nature of the environment, reducing downtime and maintenance costs.

Water Treatment

Water treatment plants rely on conductivity measurements to monitor water quality. The 871EC-SP0 helps in detecting dissolved solids by measuring conductivity, which is crucial for ensuring the effectiveness of treatment processes. Its electrodeless design minimizes the risk of contamination, making it suitable for applications where cleanliness is paramount.

Food and Beverage

In the food and beverage industry, maintaining hygiene and preventing contamination are critical. The 871EC-SP0’s electrodeless design reduces the risk of sensor fouling and ensures accurate measurements in processes involving viscous or sticky substances. It is commonly used in applications such as monitoring the conductivity of cleaning solutions or controlling the concentration of ingredients.

Pharmaceuticals

Pharmaceutical manufacturing requires precise control over process conditions to ensure product quality and compliance with regulatory standards. The 871EC-SP0’s high sensitivity and accuracy make it suitable for monitoring conductivity in various stages of production, including buffer preparation and purification processes.

Other Industries

Beyond these key sectors, the 871EC-SP0 finds applications in industries such as pulp and paper, mining, and semiconductor manufacturing. Its versatility and durability make it a valuable tool in any setting where reliable conductivity measurement is essential.

Related Models in the 871EC Series

The 871EC series includes several models designed to meet specific application requirements. Below, we highlight some of the related models and their key parameters.

Model	Material	Temperature Limit	Temperature Element
871EC-SP0	PEEK	-5 to +120°C (20 to 250°F)	100 kΩ Thermistor
871EC-SPO	PEEK	-5 to +120°C (20 to 250°F)	100 kΩ Thermistor
871EC-HP	PEEK	-5 to +200°C (20 to 390°F)	100 Ω RTD
871EC-LB	PEEK	-5 to +200°C (20 to 390°F)	100 Ω RTD
871EC-RE	PEEK	-5 to +120°C (20 to 250°F)	100 kΩ Thermistor

Each model in the 871EC series is designed to cater to different environmental conditions and measurement needs. For instance, the 871EC-HP model offers a higher temperature limit, making it suitable for applications involving high-temperature processes. When selecting a sensor, it is important to consider the specific requirements of your application to choose the most appropriate model.

How to Choose the Right Conductivity Sensor

Selecting the right conductivity sensor is crucial for ensuring accurate measurements and optimal process control. Here are some key factors to consider when choosing a sensor like the Foxboro 871EC-SP0:

• Chemical Compatibility: Ensure the sensor material can withstand the solution’s chemistry. The 871EC-SP0’s PEEK construction offers excellent resistance to corrosive chemicals.
• Temperature and Pressure: Verify that the sensor can operate within the process conditions. The 871EC-SP0 is rated for temperatures up to 120°C, but other models in the series can handle higher temperatures.
• Measurement Range: Select a sensor with a span that covers the expected conductivity levels. The 871EC-SP0 offers a wide measurement range suitable for various applications.
• Installation Requirements: Consider the mounting options and space constraints. The 871EC-SP0 can be installed using various accessories to fit different setups.
• Compatibility with Existing Equipment: Ensure the sensor can be connected to your analyzers or transmitters. The 871EC-SP0 is compatible with a range of Foxboro instruments.

By carefully evaluating these factors, you can choose a sensor that meets your specific needs and ensures reliable performance.

Installation and Maintenance of the Foxboro 871EC-SP0

Proper installation and maintenance are essential for the optimal performance of the 871EC-SP0. Below are some best practices to follow:

Installation

• Mounting Location: Install the sensor in a location where it is fully submerged in the solution. Avoid areas with air bubbles or debris that could affect readings.
• Mounting Accessories: Use appropriate mounting accessories, such as flanges or ball valve assemblies, to secure the sensor in place.
• Wiring: Follow the manufacturer’s wiring instructions to connect the sensor to the analyzer or transmitter.

Maintenance

• Cleaning: Periodically clean the sensor to remove any buildup that could affect measurements. The frequency of cleaning depends on the application.
• Calibration: Calibrate the sensor regularly using standard solutions of known conductivity. Follow the manufacturer’s calibration procedures.
• Temperature Compensation: Ensure the temperature compensation is functioning correctly, as accurate temperature measurement is crucial for conductivity readings.

By adhering to these practices, you can maintain the sensor’s accuracy and extend its operational life.

Benefits of Using the Foxboro 871EC-SP0

The Foxboro 871EC-SP0 offers several benefits that make it a preferred choice for many industrial applications:

• Durability: The PEEK construction provides excellent resistance to corrosion and mechanical stress, ensuring long-term reliability.
• Low Maintenance: The electrodeless design reduces the need for frequent cleaning and calibration, minimizing downtime.
• High Sensitivity: The sensor can detect small changes in conductivity, making it suitable for precise control applications.
• Wide Measurement Range: It can measure both low and high conductivity solutions, offering versatility across different processes.
• Compatibility: It works seamlessly with various Foxboro analyzers and transmitters, allowing easy integration into existing systems.

These benefits make the 871EC-SP0 an invaluable tool for industries that require accurate and reliable conductivity measurements.

Conclusion

The Foxboro 871EC-SP0 electrodeless conductivity sensor is a versatile and reliable choice for industries requiring accurate conductivity measurements in challenging environments. Its robust design, high sensitivity, and compatibility with various analyzers and transmitters make it suitable for a wide range of applications, from chemical processing to water treatment and beyond.

By understanding its technical parameters, industry applications, and related models, you can make an informed decision about whether the 871EC-SP0 is the right sensor for your needs. For more information on this sensor and other Foxboro products, visit our products page or consult the official Schneider Electric website.