In order to be able to guarantee the
error-free and energy-efficient performance of a VAC system, the correct
adjustment of the total volume flow must be proven. In an incorrectly adjusted
system, the indoor air quality deteriorates, which can negatively influence the
health of the staff or production quality. This is why is important that in
approval testing or when servicing a system, VAC technicians carry out a
reliable, but also ve+ry complex VAC grid measurement according to EN 12599.
With the multi-function measuring
instrument testo 480, Testo greatly
simplifies VAC grid measurement – offering VAC constructors, assessors and
facility managers a guided measurement program for norm-compliant results, as
well as a large selection of highly accurate probes for the various
requirements of the measurement.
Whether a VAC
system fulfils the prescribed total volume flow, thus guaranteeing the required
indoor climate, must be tested and proven according to the extensive guidelines
of EN 12599 in approval testing and when servicing. As the flow profile in the
duct rarely corresponds to the ideal shape (laminar/turbulent), and since the
velocity profile can be extreme depending on the distance to the next source of
interference, a grid measurement offers the safest method of correctly
calculating volume flow. However, this form of measurement is very complex, and
depending on the shape size of the duct, requires different measuring
instruments and procedures – in rectangular ducts the trivial method, for
example, and in round ducts the centroidal axis method. In addition to this,
errors are more likely in grid measurement. There are various causes for this,
ranging from influences at the measurement location up to errors in the
conversion calculations of results.
With the multi-function measuring
instrument testo 480, you conduct
VAC grid measurements norm-compliantly according to EN 12599. With an
integrated measurement program, the instrument guides you step by step through
the entire measurement process, and offers a number of highly accurate probes
such as thermal probes, vane probes or Pitot tubes – for low, medium or high
flow velocities and different duct shapes. Thanks to the intelligent
calibration concept, the probes notify the measuring instrument as soon the
next calibration is due. Digital probes can even be calibrated without the hand
instrument, allowing the uninterrupted use of the testo 480.
The measurement
procedure is structured and simple:. First you enter the necessary parameters,
such as duct geometry, distance from the edge or aperture position of the
measurement location, into the menu. You then start the measurement program,
whose graphic support guides you reliably and quickly through the measurement.
The different measurement points in the duct are approached sequentially
according to their coordinates. After the end of the measurement, the mean values
as well as the uncertainties for flow velocity and volume flow are automatically
calculated and displayed. This allows the total uncertainty to be directly
evaluated without any additional measurements. With the testo 480, you are
prepared for everything, you work quickly, obtain error-free measurement
results, and can present them to your customers directly on site.
testo 480 – all the advantages at a glance:
• Guided measurement program for norm-compliant
measurements according to EN 12599
• Compete probe range for the various
requirements of VAC grid measurement
• Intelligent calibration concept for
maximum efficiency
More information.
For more
information and answers to all your questions concerning VAC grid measurements
with the testo 480 at www.testo.com/en-IN
