Emerson 228 specifications Calibration

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MODEL 228

CALIBRATION

CALIBRATION

The nominal cell constant of the Model 228 sensor is 2.7/cm. The error in the cell constant is about ±10%, so con- ductivity readings made using the nominal cell constant will have an error of at least ±10%. Wall effects, discussed below, will likely make the error greater. For higher accuracy, the sensor must be calibrated.

Wall effects arise from the interaction between the current induced in the sample by the sensor and nearby pipe or vessel walls. As Figure 18 shows, the measured conductivity can either increase or decrease depending on the wall material. Because wall effects do not disappear until the Model 228 sensor is at least 1 inch (25 mm) away from the nearest wall, wall effects are present in most installations. Correcting for them is an important part of cal- ibration.

Conductivity sensors are calibrated against a solution of known conductivity (a standard) or against a previously calibrated referee sensor and analyzer. If wall effects are present, calibrating a toroidal sensor with a standard solution is possible only if the vessel holding the standard has exactly the same dimensions as the process pip- ing. If the Model 228 sensor is installed in a tee, duplicating the process environment in the laboratory or shop might be possible. Otherwise, calibration against a standard solution is probably impractical. The alternative is to calibrate the sensor in place against a referee sensor and analyzer, ideally while both sensors are simultaneously measuring the same process liquid. If this is not practical, calibrate the process sensor against the results of a measurement made on a grab sample.

For more information about calibrating toroidal conductivity sensors, refer to application sheet ADS 43-025 available on the Rosemount Analytical website.

FIGURE 18. Measured conductivity as a function of clearance between sensor and walls

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Contents Specifications Retraction Assemblies Specifications SensorsSpecifications Adapters SENSOR/PROCESS Application CompatibilityWiring InstallationWiring 228-54 and 228-56 sensors to Model 54eC analyzer Model Wiring Wiring 228-54 and 228-56 sensors to Model 1066 transmitter Wiring sensors through a remote junction box Wiring Through a Remote Junction BOXInstallation Requirements Manual Retraction Assembly PNInstallation Insertion Retraction AssembliesRetraction Manual Retraction AssemblyMechanical Retraction Assembly Mechanical Retraction Assembly PNModel USE of Insertion Retraction Assemblies Mechanical Retraction Assembly Replacement Parts Manual Retraction Assembly Replacement Parts Calibration Troubleshooting MaintenanceProblem Probable Cause Solution Page ON-LINE Ordering NOW Available on OUR WEB Site

228 specifications

The Emerson 228 is a cutting-edge industrial controller designed for demanding applications across various sectors, including manufacturing, oil and gas, and process automation. Known for its robust performance and reliability, the Emerson 228 integrates advanced technologies to streamline operations and enhance productivity.

One of the standout features of the Emerson 228 is its modular architecture. This design allows users to customize the controller according to their specific needs by adding or removing modules as required. This flexibility is vital for adapting to changing production environments and scaling operations efficiently.

The Emerson 228 also boasts an intuitive user interface, which simplifies the configuration and monitoring processes. Operators can easily visualize processes through graphical displays, making it possible to diagnose issues quickly and respond in real time. This enhanced visibility significantly reduces downtime and improves overall operational efficiency.

Connectivity is another key characteristic of the Emerson 228. It supports a wide range of communication protocols, including Ethernet/IP, Modbus, and Profibus. This allows seamless integration with existing infrastructure and enables the controller to communicate with various devices, sensors, and other controllers, facilitating a holistic approach to automation.

In terms of performance, the Emerson 228 is designed to handle complex algorithms and data processing tasks with ease. It is equipped with advanced processing capabilities that enable high-speed data collection and analysis. This is particularly important in environments where rapid decision-making is critical to maintain production efficiency and safety.

The Emerson 228 is also built with durability in mind. It features robust construction and is rated for extreme temperatures and harsh conditions, ensuring reliable operation even in challenging environments. This reliability translates to lower maintenance costs and longer service life, making the Emerson 228 a cost-effective solution for businesses.

Energy efficiency is a focal point of the Emerson 228, featuring technologies that optimize power consumption without compromising system performance. This not only reduces operational costs but also supports sustainability initiatives within organizations, contributing to a greener industrial footprint.

In summary, the Emerson 228 stands out as a versatile and powerful industrial controller. Its modular design, user-friendly interface, extensive connectivity options, high processing performance, durability, and energy efficiency make it an ideal choice for modern industrial applications. Organizations looking to enhance their automation capabilities will find the Emerson 228 to be a reliable and effective solution.
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