testo 435 Bedienungsanleitung Seite 55

6.2.6 Parameter/Area
Some calculated variables relate to particular reference values (ambient
conditions or factors for certain probes). These can be entered by means of
calculation parameters.
Parameters used for calculating variables:
Parameters
Temp.
(reference temperature)
(435-3/-4 only)
Humid.
(reference humidity)
(435-3/-4 only)
Pres.
(reference pressure)
Area
(cross-section area)
P-factor
(pitot tube factor)
(435-3/-4 only)
Setting p p arameters ( ( not t t he " " Area" p p arameter):
The main menu is open, Menu is displayed.
Parameter
1
Press /
2
.
OK
Press /
3
Setting t t he " " Area" p p arameter / Activating s s hape:
Five areas can be stored for the "Area" parameter. Five shapes are defined in
the default setting (two rectangles: edge length a and b, two circles:
diameter d, any shaped area: cross-section area A). The dimensions of the
areas can be adapted in the instrument. It is possible to reassign the shapes
using the PC software (435-2/-4 only).
An offset factor is stored for each area. If parts of an area are covered (e.g.
grilles on ventilation openings), this can be calculated out using the offset
factor. What must be indicated is the free part of the area (20% covered -->
80% free area --> offset factor 0.8).
Calculated measuring variables
Flow velocity, volumetric flow rate (for measurement with a
pitot tube)
Flow velocity, volumetric flow rate (for measurement with a
pitot tube)
Flow velocity, volumetric flow rate (for measurement with a
pitot tube or hot wire probe)
Volumetric flow rate
Flow velocity and volumetric flow rate (for measurement with a
pitot tube)
.
OK
to select the parameter that is to be set and confirm with
to set the value and confirm with
6. Setting the instrument 55
.
OK