10 H49 29 53/73 100 Fax: 029 53/73 96 100
DC 2000
PRO
.
Figure 3.2 – Prandtl’s tube order no. 9487 with combustion air temperature
probe A 500 order no. 9611 for automatic density correction
When the temperature T of the measured air flow deviates from the ambient
temperature of the DC 2000, the combustion air temperature probe can be
inserted over its 2 m cable into the flow parallel to the Prandtl’s tube. There is
then an automatic follow-up of the air density
ρ
as a function of the measured
temperature T according to Equation (2).
3.3 Temperature measurements
Temperature measurements are activated when the ± key in the
Signal
menu
is repeatedly pressed until the text “Temperature” appears with the unit of
measurement “°C”. Again pressing the ± key switches to the unit of mea-
surement “°F”. The ENTER key confirms the selected measuring mode and
returns to the display.
An external temperature sensor can be connected at any time. In this case
the device switches automatically to the external sensor.
For precision measurements, the sensor’s five-digit calibration number (e.g.
cal. no. 10208) should be entered under
TLOff
in the
Setup
menu. This
calibration number is printed on a metal foil provided with every temperature
sensor. When no external sensor is connected, the temperature of an internal
sensor is displayed that also serves to compensate for the temperature of the
pressure and the optional humidity sensor signals. When therefore ambient
static pressure
total pressure
temperature sen-
sor (optional)
3. Signal Menu
