Differential Temperature (Δt) - TESTO 400 Instruction Manual

9 Operation

Values currently being measured are
displayed. The measuring values can
also be called up in the
Table
views.
If the heights are being measured one after the other, you can click
directly on the second height following successful measurement of the
first height, and only after completion of the third height can the
measurement be saved. This means that all the measurement results
are saved in one report and not in three different reports.
The two calculated measurement parameters Turbulence (Tu) and
Draught rate (DR) are only calculated on the basis of all measured
values. This means that these two values are displayed at the end of
the measurement and are not calculated for each time point of the
measurement.
9.4.11 Differential temperature (ΔT)
In this application, the temperature span can be measured with two temperature
probes. This can be used, for example, to determine whether the temperature
span of a HVAC system corresponds to the set values.
Two temperature probes are required for the differential temperature
application. If more than two probes are connected to measure the
temperature, the selection of the relevant probes can only be influenced
by disconnecting and reconnecting them. The two temperature probes
connected first are selected for the calculation.
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