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. Indian 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 very complex VAC grid measurement according to EN
2599.Carry out norm-compliant VAC grid measurements – with the
multi-function measuring instrument testo 480.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.
The challenge
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 guide lines 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
instrument sand 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.
The solution
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 probesor 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
onsite.
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
Testo 480 in use
For more information and
answers to all your questions concerning VAC grid measurements with the testo
480 at www.testo.com/en-IN.
