Trotec TA400 Operating Manual page 7

Measuring the differential pressure
In the measuring mode for differential pressure measurements
the differential pressure of a zone 1 can be determined with
regard to a reference environment (zone 2 / equipment
location).
The differential pressure can be indicated in 5 different units:
• PSI
• mbar
• inH O
2
• mmH O
2
• Pa
1. Connect the white tube to the + input (16).
ð The - input (15) will not be connected to a tube.
2. Press the P/V/F button (11) until PRESS appears in the
measuring mode display (36).
3. Press the Unit button (13) to select the desired unit for
the measurement.
ð The selected unit appears in the pressure unit
display (34).
4. Press the HOLD/ZERO button (9) for approx. 2 s to reset the
saved measured values to zero.
5. Position the free end of the tube in the area (zone 1) the
differential pressure of which is to be determined with
regard to the measuring device (zone 2).
ð The measured differential pressure value will be
indicated in the measurement value indication (20).
ð A positive measured value indicates that the pressure in
zone 1 is higher than in zone 2.
ð A negative measured value indicates that the pressure
in zone 1 is lower than in zone 2.
ð The measured value 0 indicates an identical pressure in
both zones.
EN
Note:
Additionally, you can connect the black tube to the - input (15).
Bear in mind that in that case the reference environment zone 2
is equivalent to the end of the black tube, not the device
location.
Measuring the air velocity
In the measuring mode for air velocity measurements the
current air velocity is measured with defined standard
conditions (temperature 21.1 °C / 70 °F, air pressure 14.7 psi /
1013 mbar).
The air velocity can be indicated in 5 different units:
• metres per second (m/s)
• feet per minute (ft/min)
• kilometres per hour (km/h)
• miles per hour (mph)
• nautical miles per hour in knots (kn)
1. Connect the white tube to the + input (16) of both the
device and the Pitot tube.
2. Connect the black tube to the - input (15) of both the
device and the Pitot tube.
3. Press the HOLD/ZERO button (9) for approx. 2 s to reset the
measured values to zero.
4. Press the P/V/F button (11) until VEL appears in the
measuring mode display (36).
5. Press the Unit
the measurement.
ð The selected unit appears in the velocity unit
display (35).
6. Point the upper end of the Pitot tube towards the air flow.
In doing so, make sure that the Pitot tube is not inclined
more than 10° with regard to the air current.
ð The measured value will be indicated in the
measurement value indication (20).
If a negative measured value or the message Error is displayed,
please check the connections at Pitot tube and device for proper
fit and correct polarity.
dynamic pressure anemometer TA400
button (13) to select the desired unit for
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