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Air flow velocity matrix with telescope
Application information
t Equipment Depot - 800.517.8431 - 5 Commonwealth Ave, MA 01801 -
Tes
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velocity matrix
Telescope length
1800 mm
1
2
3
4
5
6. Connection hoses silicone-free
Technical data
Feature Values
Air flow
Approx. 360 x 360 mm
area
Offset factor
0.82
(S factor)
Application
The air flow velocity matrix 8721 0025 can be used in conjunction
with a differential pressure measuring instrument to measure the air
flow velocity at large supply air diffusers with laminar flow, e.g.
extractor hoods, HEPA filters, safety cabinets in cleanrooms and
other applications.
Overview
Handle
Telescope, length 1.8 m
Ball joint
Differential pressure cross with 16 measuring point
recordings
Hose connection
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Calculating the flow velocity
The flow velocity is calculated by differential pressure measuring
instruments with an input facility for the Pitot tube factor (0.82) as
follows:
=
�
2
ℎ
S: Pitot tube factor
P
: Dynamic pressure (Pa)
dyn
rho: Density (kg/m
Carrying out a measurement
1. Connect the supplied connection hoses to the differential
pressure cross.
2. Use the Velcro fastener to fasten the hoses to the telescopic
rod.
Do not attach the Velcro fastener to the tripod too tightly. This prevents
any kinking and/or stresses in the hose when pulling out or pushing in
the telescopic rod.
3. Connect the hose ends to a differential pressure measuring
instrument. (Testo recommends the testo 420 differential
pressure measuring instrument, measuring range 0.2 to 14 m/s)
> Make sure that the hoses are connected correctly.
4. Hold the air flow velocity matrix at a distance of approx. 5 cm to
the air outlet. Ensure that the matrix is exposed to the flow
across its entire area.
For the Pitot tube factor setting, please refer to the instruction manual
of the measuring instrument used.
3
)
Test Equipment Depot - 800.517.8431 - 5 Commonwealth Ave, MA 01801 -
> Start measurement.
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