MODEL 225

CALIBRATION

FIGURE 10. Remote Junction Box (PN 23550-00)

CALIBRATION

The nominal cell constant of the Model 225 sensor is 2.7/cm. The error in the cell constant is about ±10%, so conductivity readings made using the nominal cell con- stant 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 cur- rent induced in the sample by the sensor and nearby pipe or vessel walls. As Figure 11 shows, the measured conductivity can either increase or decrease depend- ing on the wall material. Because wall effects do not disappear until the Model 225 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 calibration.

the process piping. Model 225 sensors are often installed in sanitary flange tees, so an appropriate cal- ibration vessel is another tee with blank flanges on the ends. If removing the sensor from the process piping for calibration is impractical, calibrate the sensor in place against a referee sensor and analyzer while both sen- sors are simultaneously measuring the process liquid. If this is not practical the sensor can also be calibrated against the results of a measurement made on a grab sample.

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

MAINTENANCE

Conductivity sensors are calibrated against a solution of known conductivity (a standard) or against a previ- ously calibrated referee sensor and analyzer. If wall effects are present, calibrating a toroidal sensor with a standard solution is possible only if the vessel hold- ing the standard has exactly the same dimensions as

CAUTION

Be sure sensor has been cleaned of process liquid before handling.

Generally, the only maintenance required is to keep the opening of the sensor clear of deposits. Cleaning fre- quency is best determined by experience.

FIGURE 11. Measured conductivity as a function of clearance between sensor and walls

6

Page 5 Page 7
Page 6
Image 6
Emerson Process Management 225 instruction sheet Calibration, Maintenance
Page 5 Page 7

225 specifications

Emerson Process Management is a renowned leader in automation solutions, providing cutting-edge technologies that enhance process efficiency and operational reliability. One of their flagship offerings is the Emerson Process Management 225, a sophisticated system designed to optimize industrial processes across various sectors.

The Emerson Process Management 225 is characterized by its modular and flexible design, allowing users to easily integrate it into existing systems. This system is built on a state-of-the-art platform that supports advanced data analytics and real-time monitoring, making it a key instrument for operators looking to enhance their process control and decision-making capabilities.

One of the main features of the Emerson Process Management 225 is its comprehensive suite of process control tools. These tools facilitate everything from basic control functions to complex advanced process control strategies. The system utilizes predictive analytics to anticipate process variations, allowing for proactive adjustments that can significantly reduce downtime and enhance productivity.

Another notable technology integrated into the 225 is its capability for remote monitoring and control. Through secure cloud connectivity, operators can access real-time data and system performance metrics from anywhere, enabling more efficient management of operations. This feature is particularly beneficial for organizations with multiple sites or those that require round-the-clock oversight.

The Emerson Process Management 225 also emphasizes seamless communication and interoperability between devices, which is essential in today’s interconnected industrial landscape. It adheres to industry standards, facilitating easy integration with various third-party devices and existing infrastructure. This interoperability helps organizations utilize their existing assets more effectively, maximizing return on investment.

Furthermore, the 225 is designed with user-friendliness in mind. An intuitive interface simplifies navigation and makes it easier for operators to manage complex systems with minimal training. Educational resources and support services are readily available, ensuring that users can fully harness the potential of the technology.

Lastly, safety is a paramount consideration in the design of the Emerson Process Management 225. The system incorporates robust safety features and compliance with industry regulations, ensuring that operations not only meet productivity goals but also adhere to rigorous safety standards.

In summary, the Emerson Process Management 225 stands out for its modular design, advanced analytics, remote capabilities, interoperability, user-friendly interface, and commitment to safety. Together, these features and technologies make it a powerful solution for organizations seeking to enhance their process management and operational efficiency.
Top Page Image Contents