Performance Monitoring

How can the outcomes of the Merus ring be checked?

There are several possibilities to watch the effect and performance of the Merus ring in industrial applications. Depending on the problem, different performance indicators can be utilized for a before and after comparison. With this information, you can select the further procedure after your trial phase or decide to monitor for a longer term.

Comparison of flow rates

Often, a performance monitoring structure has already been installed, which makes it easy to compare the data before and after the installation of a treated and an untreated system. It depends on the level of data access and your preferences, to opt for a particular method. If you for instance kept track of the flow rate in the past, this would be a convenient approach to measure the influence of the Merus ring for your system. In order to compare the values, either the data of previous times or those of a structurally identical pipe is required.

In the graph you can see the values of two similar systems in one company; both get the same type and amount of water and the same issues with fouling occurs. The trend line in the first graph shows a decreasing flow rate, because of the reduced pipe diameter due to deposits at the walls of the pipe. The second graph shows a stabilized development with a fairly increasing flow rate.

Observing energy consumption


The level of energy consumption exemplifies the efficiency of a system, which is why it is an adequate indicator to check the effects of the Merus ring. This can be essential for heat exchangers, yet also for other applications. Just like the flow rates, a data comparison of before and after the installation is necessary to understand the values.

In the table you can see the comparison of two heating circuits. One is treated by the Merus technology and the other one is left in its original state. The data has been recorded for a period of 7 months; before and after having installed the Merus Ring.


The untreated heating circuit shows a reduced efficiency, whereas the treated heating circuit actually shows an improved efficiency rate. In this case, the gas savings are more than 30,000 m3.

Calcium or iron in the water of a closed loop

Performing a water analysis is a very easy and efficient way of checking which developments have taken place regarding the water system. If possible, we make use of this technique as an indicator for the progresses in the system after the installation. These values give a reliable indication of the water process in closed loops, however this cannot be used for large and open systems, as that data is more complex and needs to be analyzed more carefully. Compared with the total volume in the loop, the changes in the calcium or iron amount can be minimal in this case – but still visible.

Calcium Monitoring


This chart illustrates the values of a closed loop. The values without the Merus ring have been recorded prior to installation and eight weeks afterwards. During these weeks, no fresh water was supplemented. The increasing values are absolutely optimal, since they point out that the remaining deposits have been solved in the water and are flushed out of the system.

Volumetric Measurement – Assessing the inner volume of a heat Exchanger

The so-called welded heat exchangers cannot be opened for cleaning nor for servicing. Normally, these are rather small heat exchangers. In this situation, we assess the actual volume of the heat exchanger before the installation (at that time the volume is reduced due to deposits) and compare this to the hypothetical volume defined by the manufacturer. The difference is assumed to be the volume of the deposits.

Volumen Wärmetauscher

The table shows that for the primary input, the original volume could be re-established. Two weeks after the installation, the data was measured again to check the outcomes. On the secondary side the usable volume increased significantly.

TDS: Total Dissolved Solids – in an open water loop

If the fouling and deposits in the system are advanced, it can be difficult to get reliable data for the measurement of effects. One solution could be the long-term surveillance of the TDS (total amount of substances which are dissolved in the water). Immediately after having installed the Merus ring, this value will increase significantly.

The reason for this, is that covered deposits are dissolved in the water and then flushed out. Over time, this value decreases until it reaches the equivalent level of the feed water and stabilizes.

Visual examination


Despite all the possibilities for performance monitoring, it is usually better to have a visual inspection, which can clearly demonstrate the developments after the installation of a Merus ring. “Seeing is believing.” – a visual examination is the most convincing way for the majority of our customers.

Often it is not an option to easily open the system or pipes, which is why we will then install the Merus ring during a regular, short-term down time of the system.


Pronomar B.V.
Noordeinde 88C
3341 LW
the Netherlands

T  +31 (0)78 – 68 19 481
F  +31 (0)84 – 22 54 573

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