Special Products
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VSM-3K |
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Our outstanding product is the VSM-3K with its huge
measuring range of at least 1:3000 (!)
With this extremely large measuring range the VSM-3K is not only suited for measuring gas or
compressed air consumption rates, as would be quite usual, but it can be used in order to
perform a search for small or smallest leakages as well.
This feature are built-in, so to say, so there is no need to modify anything in the line system prior
to checking for possible leakages. Also in R&D the large measuring range of the VSM-3K makes
it a unique and valuable measuring tool.
Clearly, with the use of a number of appropriate measuring nozzles, the
scalability (total measuring range) of a standard VSM-02 is even more impressive.
On the one hand it is possible to measure how many ml of air are moved by one puff
from a cigarette, and on the other hand one can measure as well the daily or yearly
consumption of giant assembly halls, for instance.
The VSM-3K has the same or better scalability, of course, but can do still a
lot more than a standard VSM-02, especially in situations where the flow rate profile
might change thouroughly and frequently.
Simply by not requiring to change the measuring nozzles and by
not requiring to stop the gas supply during the time needed otherwise to install a different
measuring nozzle, the VSM-3K saves a lot of time and money,
for instance when used for leakage searches from time to time. Because the line system is
held under full working pressure all the time, a quick leakage
survey can take place whenever
possible, e.g. during lunchtime breaks, and there is no need for tedious coordinations with
the cost centers in order not to interfere with their work. They either work or don't. And if
they don't work, you can see immediately whether there are any permanent leakages or not.
Measuring ranges:
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0.5 inch nozzle
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1 inch nozzle
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2 inch nozzle
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| Line pressure
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1 bar
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6 bar
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1 bar
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6 bar
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1 bar
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6 bar
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Volume flow
calibrated [l/min]
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0.5 - 1530
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0.5 - 3000
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1.4 - 4300
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1.4 - 8500
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5.7 -17000
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5.7 - 33000
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2mm nozzle
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4mm nozzle
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| Line pressure
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1 bar
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6 bar
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1 bar
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6 bar
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Volume flow
calibrated [l/min]
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3.2-48
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6.3-95
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14-210
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27-410
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Just like the VSM-02, the VSM-3K can be adapted to practically any given consumption situation
by the use of different measuring nozzles. Customer specific nozzles are possible, diameters as
required.
The extreme measuring span was reached by the integration of a calorimetric
sensor for very low volume flow rates below the sensitivity threshold of the VSM-02.
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Right: the ready-to-use assembled VSM-3K system in its stable transportation case |
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Left: calorimetric sensor in patented mounting case |
At very low gas speeds the calorimetric measuring principle is extremely
sensitive.
However, this sensitivity rapidly goes down at higher gas speeds and an early saturation
limits measurements at still higher speeds. In combination with the measuring principle
of the VSM-02, however, the resulting measuring device now has an extremely wide measuring
range (measuring span). Already at ambient pressure a span of typically 1:3000 is reached, at
higher operating pressures even more.
But that is not all. For the VSM-3K we used, of course, the existing sensors of the VSM-02 in order to
minimize the notorious shortcomings of the calorimetric measuring principle, namely by performing
an independent pressure and temperature compensation. It should be
noted that most commercially available, stand-alone calorimetric mass flow measurement systems are,
simply by their design, not capable of doing any similar corrections.
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USA version |
The USA version comes by default
with the units shown in the picture below (SCFM, PSI, °F etc.).
With the included PC-software the device can be re-programmed to use
metric units, if desired.
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| USA version | |
European version | |
In general all newer VSM-02 devices can work with metric units as well as
with units based on foot and pound. Therefore, users of the European version, too, can
switch to the US unit system, if desired.
Tip: When examining very low consumption rates by watching
the consumption counter, the use of the US unit system can be advantageous. This is
due to the fact that 'cu ft' (cubic foot) is a much smaller basic unit than m³
(cubic metre). In the metric version the least significant digit of the consumption counter
is 1 litre (=1/1000th m³), whereas it is only about 0.28 litres (=1/100th cu ft) in the
US version. Mind you, however, that the included Windows software offers some better and more
precise methods for examining very low consumption rates and flow profiles.
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