User Manual

MON20/20 Software for Gas Chromatographs

3-9000-745

OCTOBER 2010

 

 

B.2 Peak detection

For normal area or peak height concentration evaluation, the determination of a peak's start point and end point is automatic. The manual determination of start and end points is used only for area calculations in the Forced Integration mode. Automatic determination of peak onset or start is initiated whenever Integrate Inhibit is turned off. Analysis is started in a region of signal quiescence and stability, such that the signal level and activity can be considered as baseline values.

Note

The controller assembly software assumes that a region of signal quiescence and stability will exist.

Having initiated a peak search by turning Integrate Inhibit off, the controller assembly performs a point by point examination of the signal slope. This is achieved by using a digital slope detection filter, a combination low pass filter and differentiator. The output is continually compared to a user-defined system constant called Slope Sensitivity. A default value of 8 is assumed if no entry is made. Lower values make peak onset detection more sensitive, and higher values make detection less sensitive. Higher values (20 to 100) would be appropriate for noisy signals, e.g. high amplifier gain.

Onset is defined where the detector output exceeds the baseline constant, but peak termination is defined where the detector output is less than the same constant.

Sequences of fused peaks are also automatically handled. This is done by testing each termination point to see if the region immediately following it satisfies the criteria of a baseline. A baseline region must have a slope detector value less than the magnitude of the baseline constant for a number of sequential points. When a baseline region is found, this terminates a sequence of peaks.

A zero reference line for peak height and area determination is established by extending a line from the point of the onset of the peak sequence to the point of the termination. The values of these two points are found by averaging the four integrated points just prior to the onset point and just after the termination points, respectively.

B-2

Page 406 Page 408
Page 407
Image 407
Emerson Process Management 3-9000-745 manual Peak detection
Page 406 Page 408

3-9000-745 specifications

Emerson Process Management is a leading provider of automation solutions, offering a range of products designed to streamline operations and enhance productivity in various industrial sectors. One of their notable offerings is the 3-9000-745 model, a versatile and robust device that exemplifies Emerson's commitment to innovation and efficiency.

The 3-9000-745 is primarily known for its application in process control and monitoring. It is engineered to manage operations in dynamic environments where real-time data is critical. This device features advanced control algorithms that allow for precise regulation of processes, ensuring optimal performance and minimal downtime. Its reliability makes it ideal for industries such as oil and gas, chemicals, water treatment, and manufacturing.

One of the key technologies integrated into the 3-9000-745 is advanced analytics. This technology leverages data collected from various sensors and devices to provide insightful analysis regarding operational efficiency. With this capability, users can make informed decisions and forecast maintenance needs, thus reducing operational costs and improving productivity.

The communication capabilities of the 3-9000-745 are also noteworthy. It supports multiple communication protocols, which allows for seamless integration with existing systems, enhancing interoperability within a facility. This feature is particularly beneficial for organizations looking to modernize their infrastructure without overhauling their entire process control system.

In terms of user interface, the 3-9000-745 is designed with ease of use in mind. It includes a user-friendly interface that simplifies configuration and monitoring processes. The intuitive dashboard provides real-time insights and alerts, allowing operators to respond swiftly to any anomalies detected in the system.

Durability and ruggedness are additional characteristics that set the 3-9000-745 apart. Designed for harsh industrial environments, it meets stringent safety and regulatory standards, ensuring reliable operation even in challenging conditions. This reliability contributes to minimized downtime, maximizing productivity and efficiency.

In conclusion, the Emerson Process Management 3-9000-745 stands out as a comprehensive solution for process control and monitoring. With its advanced analytics, robust communication capabilities, user-friendly interface, and durability, it effectively addresses the diverse needs of modern industries, contributing to greater operational efficiency and sustainability.
Top Page Image Contents