TESTO 435 - Calculations

6.2.5 Calculation
If calculation is switched on, additional parameters with calculated values can
be displayed from the readings of
one
probe. These are then displayed as
additional measurement channels in measurement view.
Particular measurement channels must be available in order to perform the
calculation.
Additional calculation parameters need to be set for some calculated variables.
 See the chapter PARAMETER /AREA, p. 24.
The following variables can be calculated:
· Flow velocity (435-3/-4 only)
· Volumetric flow rate
· Dew point (below 0°Ctd /32°Ftd frost point temperatures are displayed)
· Psychrometric temperature
· Enthalpy (Heating/cooling performance of assemblies)
The heat transfer coeffiient (alpha) required for the calculation of the U-value can
be set.
It is also possible to calculate the difference between two measurement
channels (Delta). This is only possible if the selected measurement channels
have the same unit.

Activating/deactivating reading calculation:
 The main menu is open, Menu is displayed.
1 Calc.  .
2 Press / to select the variable that is to be activated/deactivated
and confirm with .
3 Press / to select On (= activated) or Off (= deactivated) and
confirm with .

Activating differential calculation (delta):
 The instrument is in measurement view.
Differential calculation is performed with the parameters that are shown on
the display.
1 Press and to select the measurement channels from which the
difference is to be calculated.
2 Press to open the main menu.
3 calc.  .
OK
OK
OK
OK
6. Setting the instrument 23
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