S&P TDP-D Manual De Instrucciones página 2

ENGLISH
TDP-D is an electronic pressure transducer designed primarily to
measure total and differential air pressures in ventilation systems.
used together with a standard aperture, the pressure transducer can also
measure air volume.
FUNCTION
TDP-D-D is a pressure transmitter for comfort ventilation systems. It
provides an active current or voltage signal proportional to the measured
air pressure. If the pressure transducer is set for air volume
measurement, differential pressure (Δp) is converted to air volume (qv)
using the following formula: qv = k.Δp.
TDP-D consists of semiconductor elements. There is no air throughput
and the unit is thus protected against dust in the ventilation system. The
pressure element is temperature compensated to provide accurate
pressure measurement throughout the specified temperature range.
The required measuring range of the pressure transducer is set with DIP
switches. The output signal can be changed from voltage [V] to current
[mA] by setting the DIP1 (SW1). The DIP2 (SW1) allows two different
damping times to be selected so that pressure fluctuations within the
ventilation system are attenuated in the transducer output signal. A green
LED indicates that supply voltage has been connected correctly. If the
actual pressure is outside the selected measuring range, the green LED
flashes. If the actual pressure/air volume is outside the selected
measurement range, the display flashes.
TECHNICAL DATA
Full scale pressure range . . . . . . . . . . . . . . . . . . . . . . . 0-2500 Pa
Measurement ranges, pressure:
-50..+50 Pa; 0..+100 Pa; 0..+150 ; 0..+300 Pa;
0..+500 Pa; 0..+1000 ; 0..+1600 Pa; 0..+2500 Pa
Measurement ranges, air volume:
100 m
3
30 m /h x 1000; 50 m
k-factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 to 2000
Supply voltage. . . . . . . . . . . . . . . . . . . . 24 V AC ±15%, 50/60 Hz
Own consumption (-20ºC/+40ºC) . . . . . . . . . . . . . . . . max. 0,5 VA
Output signal (selectable) . . . . . . . . . . . . . . . . . . . . . . . 0-10 V DC
Accuracy output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(MV=measured value / SR=set measuring range)
Dampening (selectable). . . . . . . . . . . . . . . . . . . . . . . . 0.4 s o 10 s
Max pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 kPa
Ambient temperature . . . . . . . . .-20/+40°C (constant operation)
Dimensions. . . . . . . . . . . . . . . . . . . . . 75 x 36 x 91 mm (voir fig.1)
Cable dimensions. . . . . . . . . . . . . . . . . . . . . . . .4 x max. 1.5 mm
Pressure connector . . . . . . . . . . . . . . . . . . . . . . . 2 x ø6.2 mm
Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IP54
INSTALLATION
TDP-D must be securely mounted on a level surface using screws. TDP-
D is insensitive to mounting orientation. However, in order to maintain the
specified enclosure rating, tubes should be attached to both tube
connectors if the connectors point upwards. The enclosure is equipped
with screw holes, see fig. 1.
Pressure is connected by means of tubes. The higher pressure must be
connected to the "+ connector" and the lower pressure to the "-
connector". If the tubes are unintentionally exchanged, or the pressure is
outside the measuring range, the display flashes. See table 1.
The pressure tubes must be as short as possible and must be secured in
position to prevent vibration. To obtain the best possible results, pressure
must be measured where there is least risk of turbulence, i.e. in the
centre of the ventilation duct and at a suitable distance from bends and
branches. See fig. 2.
The enclosure is opened without the use of tools by pressing the snap
lock at the side of the connectors. Chose the terminal to be used
(terminal 2 or terminal 4) depending on the desired output signal (Figs.
3). The transducer cable may be up to 50 m in length and must be
connected as shown in fig. 3. The transducer cable must be kept
3 3 3
/h; 300 m /h; 500 m /h; 1000 m
3 3
3000 m /h; 5000 m /h; 9999 m
3 3
/h x 1000; 99,99 m /h x 1000
3
m /h can replace by l/s
13.5-28 V DC
2-10 V DC
4-20 mA, 0-20 mA
1,5%xMV+0,3%xSR+2,5Pa
-30/+50°C (transient)
separate from mains-carrying cables as voltage signals from these may
affect transducer function.
SETTINGS
Select pressure or air volume by setting the DIP3 (SW1). See fig. 3 and 4.
To display the measurement range, press the "", "" or "OK" button on
the rear cover once (see fig.5).
When
If the buttons are not pressed again within 60 seconds, the display will
revert showing the actual measured value. Press "" or "" repeatedly to
change the measurement range up/down. The measurement range will
flash on the display until setting be saved by pressing the "OK" button.
Pressure measurement (fig.10): If the DIP1 (SW1) switch is set for
pressure measurement, actual pressure will be shown on the display.
Air volume measurement (fig.11): If the DIP3 (SW1) switch is set for air
volume measurement, pressing "OK" button allows the first digit of the k-
factor to be set. The value will flash and can be set using the "" and ""
buttons. When set correctly, press "OK" to save the k-factor and the display
will automatically begin showing the actual measured value. If standard air
volume measurement is selected, no pressure range needs to be set. An
example of air volume calculation is shown on fig.12.
Square root output (fig.13): If air volume range P is selected, TDP-D
operates as a pressure transducer with square root output and the air
volume is displayed in per cent (Delta P [%]). Full scale is determined by
the set pressure range (P-range) and the value shown on the display is
calculated as Delta P[%]=100xΔp/p-range). When air volume range P is
selected, pressing "OK" allows the pressure to be selected. Once the
pressure range has been selected, press "OK" to save the setting and the
display will automatically begin to show the actual measured value.
Changing measurement unit: Depending on the k-factor unit and the
selected air volume range, attach one of the accompanying self adhesive
unit label to the front cover of the transducer (see fig. 6 and 7)
Select whether the output signal is to be V or mA on the jumper, and set the
minimum value of the output signal with the DIP switch (see fig.3 and 8)
Set the damping time with the DIP switch. See figs 3 and 9. The transducer
measures the pressure several times within the set time and the output
signal consists of the average of these measurements. This allows any
pressure fluctuations within the ventilation system to be dampened in the
3
/h;
transducer output signal.
3
/h;
ZEROING
The transducer can be zeroed after it has been mounted and the power
supply connected. For best results, wait until the transducer has reached
usual operating temperature.
Before zeroing the transducer, it is important to ensure that the pressure on
the + and - connectors is equal (e.g. by stopping the ventilation system). If
the display shows a differential pressure of more than 10 Pa there may be
unintended pressure in the system (draughts or pinched tubes).
It is recommended that tubes be removed from the + and - connectors
during zeroing. Zeroing is activated by pressing the integrated zero-set
switch SW3 (see fig. 3), after which the yellow LED will continue to flash
until zeroing has been completed.
LED INDICATION
The green LED is lit when the power supply has been connected correctly.
The yellow LED flashes for approx. 3 seconds during zeroing.
2
LED on
Green
Yellow
Table 1
FIGURES
Figure 1: Dimensioned sketch
Figure 2: Transducer position in relation to bends and branches
Figure 3: Wiring diagram
Figure 4: Pressure/air volume selection
Figure 5: Measurement range selection
Figure 6: Measurement unit indication
Figure 7: Measurement unit label selection
Figure 8: Output signal selection
Figure 9: Damping time selection
Figure 10: Pressure setting
Figure 11: Air volume setting
Figure 12: Air volume calculation example
Figure 13: Square root settings
On Flashing
OK
Zeroing in progress
Off
No supply
OK