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  1. Overview Often times two (or more) units that the same products and unit procedures. This is common in continuous processes that are running a specific "grade"; also in batch processes that are manufacturing the same product ID. Since they are identical pieces of equipment or units, the “profiles” of critical process parameters are similar and we want to use profiles from multiple units for our reference profile. In this example we will create a profile from 2 units - the same process can be applied for additional units ad infinitum. Then we will apply this profile to a running batch to
  2. Summary: Many of our users monitor process variables on some periodic frequency and are interested in a quick visual way of noting when a process variable is outside some limits. Perhaps you have multiple tiers of limits indicating violations of operating envelopes or violations of operating limits, and are interested in creating a visualization like that shown below. Solution: Method 1: Boundaries Tool One method to do this involves using the boundaries tool. This tool is discussed in Step 3 of this seeq.org post, and results in a graphic like that shown below.
  3. Overview This method will provide a simple visualization of externally determined control limits or help you accurately calculate new control limits for a signal. Using these limits we will also create a boundary and find excursions for how many times and for how long a signal deviates from the limits.These created signals can be used in follow-on analysis search for periods of abnormal system behavior. In this example we will be creating average, +3 Std Deviation and -3 Standard Deviation boundaries on a Temperature Signal. Setup
  4. Use Case Background Commonly, engineers are interested in calculating limits on a signal based upon the average and standard deviation. Additionally, there may be different modes of operation during which the performance - and limits - is different. This post describes how to develop mode based boundaries for a process signal to identify deviations from the normal or expected behavior. Mode Conditions In this example, I am interested in calculating boundaries on a Compressor Power signal based upon the mode of operation in a Compressor Stage Signal. (Note: These signals are f
  5. Objective: Take a signal for which you have pre-defined upper and lower limits that are determined by an operating mode or production grade. We want to create a vertical boundary around the transition region between the two operating modes that has the greater of the two upper limits and the lower of the two lower limits. Assumptions: A signal for operating mode, product grade, etc exists that can be used to create a condition for all operating modes. The signal can be string or numeric and will be referred to in the solution as $mode. A signal for the maximum (and min
  6. This use case came up while working with a customer last week, and I thought it was worth sharing on the forum, since other users may be interested. The user I was working with was interested in creating limits for a signal. The limits would be calculated based upon the average and standard deviation of the previous 4 hours of operation; essentially the user wanted to create a rolling 4 hour boundary. We worked out the following solution: 1. Create a periodic condition for the time period that you would like to use for this rolling window. Here I created 4 hour periods:
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