Four critical areas where samples can take too much time moving along

In a process analyzer sampling system, there is always a delay between the moment you grab the sample and the time you obtain a reading. This time delay may be longer than you think. Underestimating it can lead to inferior process control. If you’re assuming your time delay is one minute, but in fact it’s two hours, your analyzer readings may no longer be relevant or purposeful.

Time delay is cumulative, accounting for the total amount of time it takes for a sample to travel from the tap in the process line to the analyzer and be analyzed. You want to minimize this delay, with a common goal of one minute or less from the tap to the analyzer reading.

You’ll find time delay throughout an analytical instrumentation system.

Here are four main areas to look at closely:

  1. Delay in the probe
  2. Delay in sample transport (including the field station and transport lines)
  3. Delay in sampling conditioning (including stream switching)
  4. Delay in the analyzer

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