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Air flow velocity matrix with telescope
Application information
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Technical data
Feature Values
Air flow velocity matrix
area
Telescope length 1800 mm
Offset factor
(S factor)
Application
The air flow velocity matrix 0635 8888, Testo ID no. 0699.7077/1
and 0699.7077/2, 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.
Approx. 360 x 360 mm
0.82
Overview
1 Handle
2 Telescope, length 1.8 m
3 Ball joint
4 Differential pressure cross with 16 measuring point
recordings
5 Hose connection
6. Connection hoses silicone-free
2
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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:
=== Ende der Liste für Textmarke Inhalt ===
=
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.
> Start measurement.
3
)
3
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