Service
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Measuring services |
Many firms are offering short- and long-term consumption protocollings with our
devices. Their offer includes all necessary actions to be done, e.g. the
installation of the measuring nozzles in the line system, the measurements, the
protocolling of the measured values and the removal of weaknesses and leakages.
Please ask, e.g., for informations on the Energy Saving" program of FESTO
(see also directly here, PDF-file, 60 KB).
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Additional media |
Besides of the preselected gases and liquids in setup mode, the VSM-02 can be used to
measure many other gases as well. To serve this purpose in setup mode there is a feature
to enter the individual gas constant manually, along with the standardized density at
15 °C. The parameters of several useable gases can be found in the table below.
| Gas |
Gas constant
in J/kgK |
Std. density
in kg/m³ bei 15 °C |
| Ammonia, NH3 |
488,148 |
0,7313 |
| Argon, Ar |
208,147 |
1,6907 |
| Helium, He |
2076,961 |
0,1692 |
| Carbon monoxide, CO |
296,819 |
1,1849 |
| Carbon dioxide, CO2 |
188,906 |
1,8740 |
| Carbonyl sulfide, COS |
138,392 |
2,5793 |
| Air |
287,091 |
1,2254 |
| Neon, Ne |
411,940 |
0,8531 |
| Oxygen, O2 |
259,819 |
1,3546 |
| Sulfur dioxide, SO2 |
129,772 |
2,7740 |
| Carbon disulfide, CS2 |
109,188 |
3,2943 |
| Nitrogen oxide, NO |
277,059 |
1,2705 |
| Dinitrogen monoxide, N2O |
188,887 |
1,8774 |
| Nitrogen, N2 |
296,761 |
1,1854 |
| Nitrogen (air) |
295,250 |
1,1916 |
| Water vapor, H2O |
461,484 |
0,7620 |
For your safety: many technically important gases are
inflammable or explosive. Please never use the VSM-02 basic model
in order to measure such gases !
The explosion protected version of the VSM-02, however, can be
used to measure even more gases, e.g.:
| Gas (with VSM-02/EX only!) |
Gas constant
in J/kgK |
Std. density
in kg/m³ bei 15 °C |
| Acetylene, C2H2 |
318,816 |
1,1107 |
| Ethane, C2H6 |
276,490 |
1,2863 |
| Ethylene, C2H4 |
296,358 |
1,1948 |
| Benzene, C6H6 |
106,442 |
3,3036 |
| N-butane, C4H10 |
143,041 |
2,5899 |
| Isobutane, C4H10 |
143,041 |
2,5090 |
| Butene, C4H8 |
148,179 |
2,3731 |
| Chlorine, Cl2 |
117,239 |
3,0469 |
| Hydrogen chloride, HCl |
228,006 |
1,5539 |
| Hydrogen cyanide, HCN |
307,626 |
1,1608 |
| Cyanogen, C2N2 |
159,771 |
2,2270 |
| Methane, CH4 |
518,235 |
0,6795 |
| Methyl chloride, CH3Cl |
164,664 |
2,1873 |
| Propane, C3H8 |
188,544 |
1,9050 |
| Propylene, C3H6 |
197,566 |
1,8154 |
| Hydrogen sulfide, H2S |
243,942 |
1,4562 |
| Toluol, C7H8 |
90,241 |
3,8967 |
| Hydrogen, H2 |
4124,110 |
0,0852 |
| Xylol, C8H10 |
78,316 |
4,4900 |
As a matter of course, ordinary air can also be measured with the VSM-02.
Throughout the industry the so called compressed air is
widely used as a means to transport mechanical energy. The importance of compressed
air for this special use was the reason to produce a specialized version of the VSM-02,
the so called RectuTest RT-02. In opposition to the VSM-02, the RT-02 could only
be used to measure compressed air, but this was compensated by the additional consultive
competence of our sales partner who maintained local sales offices in many countries and
was specialized in the industrial application of compressed air.
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Gas mixtures |
The volume flow of mixtures of several gases can be measured precisely by the
VSM-02. All that is needed is to know the average density and the average
gas constant of the mixture. Both values can be entered comfortably in
SETUP-mode. If your browser has JavaScript enabled,
you can use the calculator below in order to find the necessary setup values
from the gases in your particular application. Please choose the gases from
the selection box and push the 'Add'-button to bring them into the table.
Hint: The values in the column 'Vol.%'
must sum up to 100 %. If this is not the case, the entered values will
be automatically scaled to 100 % on clicking the 'Calculate'-button, thus
overwriting the originally entered values in most cases. Therefore please
push this button, if possible, only after you have entered
all gases.
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Pressure losses and Nozzle selection |
The volume flow is measured with the help of a slight pressure drop in
our measuring nozzles (the so called effective pressure). A considerable
amount (approx. 2/3) of this pressure loss is regained, however. So,
together with the high sensitivity at low effective pressures,
with a correctly chosen nozzle diameter it is the rule, rather than
the exception, to have only minimal remaining pressure losses.
If your browser has JavaScript enabled,
you can use the calculator below (which uses compressed air as an
example) in order to see for yourself, how high or low the remaining
pressure losses would be in your application. Just enter a value in the
field "Volume flow", press the "Calculate" button and, maybe, play a
bit with different nozzle diameters in order to see how pressure losses
can further be minimized.
In case the calculator only presented you
the messages "Nozzle too small" or "Nozzle too big": we offer numerous other nozzles as well,
starting presently from 0.2 mm and going up to 10 inches in diameter. This
allows the use of the VSM-02 and VSM-3K in nearly all practically imaginable applications
and dimensions of volume flows.
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| 0.2 mm nozzle, max. 0.07 m³/h |
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2" nozzle, max. 2000 m³/h |
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| 10" nozzle, max. 60,000 m³/h |
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Measuring from 0.02 l/min to
60,000 m³/h,
i.e. over a range of 1:50 millions |
Hint:The outstanding scalability of the VSM-02 is due to the
use of different measuring nozzles. Without the need to change the measuring nozzle,
however, the new VSM-3K offers a contiguous measuring range
of at least 1:3000 already at ambient pressure, at higher line pressures a ratio of
1:6000 and even more can be reached. These properties are world-wide unique.
In plain words: changing a nozzle is always associated with some effort, time,
work and costs. Eventually the supply must be interrupted for a longer time, causing
additional, sometimes much higher costs. The VSM-3K, on the other hand, usually
doesn't require any nozzle changes. Even at a regular flow of, e.g., 60,000
m³/h the VSM-3K can still identify flows as low as 10 m³/h,
which one would consider to be a small leakage at the given scale. At
no time the supply needs to be interrupted. You will get no standstills, no
additional costs, but a pretty good leakage overview in addition to the
regular consumption measurements.
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Backup service |
You want to restore the factory settings in a VSM-02, but can't find the original disk?
No problem,we retain a backup from every device. Just send us an email with the serial
number of the VSM-02 and the requested backup copy comes in return.
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Software-Update f. RT-01 |
For the older model RT-01 (compressed air) you can download
an update of its PC/link-programm (version 1.6, approx. 800 KB).
Unpack the ZIP-file to an own directory and start the installation from there (SETUP.EXE).
Besides, there is also the possibility to upgrade the RT-01 firmware to version VSM-22.
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