Under stable operating conditions, the objective is to record the MSM400 attenuation figure, and immediately take a sample of the slurry present between the sensor faces.This is then analysed in the lab, to derive the solids %, and this % value is later linked to the previous ultrasonic attenuation. The objective is to take three separate readings and samples, which are averaged by the Microprocessor.

Preferably the readings should be taken for a slurry concentration that Is as high as possible, to give the best accuracy for the slope calculation. The three readings are date coded, and can all be separately inspected.

Ensure that the frequency is correct and that access is enabled as above. With the sensor in a stable representative slurry, note the value of the relevant “Span dB” which is the attenuation due to the suspended solids. This is the

total attenuation minus the zero ref and is available in two parameters, Span dB @ A MHz (D854) for 1MHz sensor and Span dB @ BMH2 (D855) for 3.3MHz sensors. They are located in Monitor \ Diagnostics \ Sensor.

At the same time take a physical sample of the slurry for laboratory analysis by drying and weighing.

Now enter the value of “Span dB” recorded, in the relevant “Span I @ 1MHz” (P130) or “Span I @ 3MHz” (P131) parameters. (accessed via Calibration / Manual Entry / Span)

When the laboratory analysis results are available, the span calibration can be completed by entering the solids content (in % Solids) into “Lab Value 1” (P150). -

(If required, an estimated value can be used until the laboratory analysis results are available.)

For improved accuracy up to three samples can be taken. These should be taken at roughly the same time and the “Span dB” noted for each one. The values are entered into the relevant Span 1, Span 2, Span 3 and Lab Value 1, Lab Value 2, and Lab Value 3 (accessed via Calibration / Manual / Entry / Lab Values). The MSM400 will automatically average as many values as are entered.

The MSM400 stores the calculated value of the slope in 0858 (1MHz) and D859 (3.3MHz) It is recommended that a note is made of this value. Note that the value of the frequency not being used is displayed as zero.

6.12ATTENUATION VALUE-METHOD 3

Select the CALIBRATION /Manual Entry / Sensor to access the dB FACTOR value. This is the attenuation in dB per percent solids for the size/type of sensor and the slurry in use. Typically this data would have come from another installation of the same type, or previous data on this installation, read from the Diagnostic Display Data screens. Enter the numerical value required.

NB: It Is advisable to recheck the zero setting on the plant periodically (Every 6 months at least).

IP258

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Emerson IP258 manual Attenuation VALUE-METHOD
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IP258 specifications

The Emerson IP258 is an advanced industrial monitoring device designed to enhance operational efficiency and ensure optimal performance in various industrial applications. It is particularly suited for monitoring, controlling, and managing processes across diverse industries such as oil and gas, pharmaceuticals, food and beverage, and water treatment.

One of the main features of the IP258 is its robust and flexible architecture, enabling seamless integration with a wide range of field devices, sensors, and control systems. This adaptability ensures that the device can be tailored to specific operational needs, thus streamlining processes and enhancing reliability. Its modular design allows for easy upgrades and expansions, making it a cost-effective solution for companies looking to future-proof their investments.

The IP258 boasts advanced communication technologies, including support for various industrial protocols such as Modbus, Ethernet/IP, and Profibus. This versatile communication capability facilitates real-time data sharing and interoperability between different systems, promoting a cohesive operational environment. The device is equipped with multiple input and output options, which further enhances its functionality and connectivity with existing infrastructure.

Another standout characteristic of the Emerson IP258 is its user-friendly interface, which simplifies operation and minimizes training requirements. The intuitive graphical interface allows operators to easily visualize system performance, access historical data, and quickly identify anomalies. This ease of use not only ensures efficiency during normal operations but also aids in rapid troubleshooting and issue resolution.

The device is designed with high reliability and durability in mind, featuring superior environmental resistance to withstand harsh industrial conditions. Its rugged housing and advanced components ensure long-term performance, reducing the likelihood of unexpected downtime and maintenance costs.

In addition, the IP258 incorporates built-in data logging and analytics capabilities, enabling users to gather insights into operational trends and performance metrics. This feature is essential for predictive maintenance and proactive decision-making, ultimately driving productivity and minimizing operational risks.

Security is another priority in the design of the Emerson IP258. The device includes a comprehensive suite of cybersecurity measures to protect sensitive data and prevent unauthorized access, ensuring that operational integrity is maintained at all times.

Overall, the Emerson IP258 stands out as a powerful and versatile tool for industrial monitoring and control, combining advanced features, robust technology, and user-friendly design to meet the demands of modern industrial environments.
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