The data for this chart (see below) had been provided by a customer who uses our mic-mobile and his isokinetic sampling together. The target was to measure the flow in eight pipes and balance it. Both measurements the mic-mobile and the isokinetic showed a strong variation in some pipes. Such an unsteady flow is a bit unusual but happens from time to time.

It is a common habit that if you do isokinetic sampling you take two samples. If the samples are nearly the same you take the average of both as result. If they vary to much you take a third sample and take only the two samples in account that are close to each other.

We think that method is not very accurate. We recommend that as long there was no obvious failure during isokinetic sampling you should always take all results as average into the calculation. This usually fits much better with the results of our mic-mobile. The chart explains why. A mill on steady state does not necessarily mean a steady state flow in each pipe. This is even then the case when the total flow is more or less steady as the measured sum in the chart shows!

Without our mic-mobile at hand the customer would have spend way more time with isokinetic sampling with probably only questionable results.

Furthermore the whole coal flow balancing process is accelerated tremendous. Since you see in real time what happens when you start to adjust your valves or adjustable orifices. And on top of that the mill has not to be put on manual since our measurement technology does not need steady state. This means you can balance your flow under real operating conditions not under an artificial steady state conditions.