TESTO 454 - Specials; Flow Volume; Density; Pressure

Flow vol.
round
10.0 mm
Flow vol.
round
˛0.0 mm
Flow vol.
round
12.5 ˛m
8.8 Specials
8.8.1 Special functions display
Special functions, calculated from the measured val-
ues of the connected probes, are displayed in the
measuring menu if they are activated in the
“S
PECIALS.” menu.
td = Dew point (Combination probes %RH - °C)
m
3
/h = Volume flow (Velocity probe)
The accuracy of the volume flow display
follows from the accuracy of the velocity
measurement. Multiply the maximum and
minimum possible velocity value in the
accuracy data by the cross-section to get the
permissible deviation of the volume flow
measurement.
m/s = Air velocity (pressure probe)
The Pitot tube differential pressure is
converted to air velocity. Here the air density
is entered as a parameter (see Appendix
“Probe description”).
Switching on or off is carried out via <up><down>
and your entry is confirmed via <Enter>.
The special functions selected are activated by a
restart. The settings remain even after the measuring
instrument is switched off.
8.8.2 Flow volume
Enter the dimensions of the air channel (round,
square, cross-section area). The measuring instru-
ment calculates the flow volume set in
“SF
DISPLAY”(see above).
8.8.3 Density
The density is required for the conversion of the
dynamic pressure into velocity. Please find the corre-
sponding value in the enclosure Measuring engi-
neering.
8.8.4 Pressure
The air pressure is required for the compensation of
the CO
2
probe and the pressure probe (Pitot tube).
Refer to the more detailed description in the enclo-
sure Measuring engineering.
Specials
‚F-no.
Flow vol.
Density
Specials
td øn
m3/h on
m/s on
Specials
td øff
m3/h on
m/s on
Specials
td on
m3/h øn
m/s on
Specials
td on
m3/h on
m/s øn
Restart
to
activate
Specials
SF display
ƒlow vol.
Density
Flow vol.
square
10.0 mm
10.0 mm
Flow vol.
Area
10.0 mm2
10.0 %
Ein
On
Enter /
Ein
On
Enter /
Specials
SF display
Flow vol.
∂ensity
Density
1123 g/m3
Ein
On
Enter /
Ein
On
Enter /
Abs. pressure
1013 hPa
Specials
Flow vol.
Density
πressure
Ein
On
Enter /
Ein
On
Enter /
Ein
On
Enter /
Ein
On
Enter /
Ein
On
Enter /
8Main menu
31
Ein
On
Enter /
Ein
On
Enter /
Ein
On
Enter /
Ein
On
Enter /
Ein
On
Enter /
Ein
On
Enter /
(Select from
“mm”, “cm”, “m”)
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