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Idiomas disponibles
Idiomas disponibles
ENGLISH
TDP-S is an electronic pressure transducer designed primarily
to measure total and differential air pressures in ventilation
systems. The resulting measurements are used for monitoring,
control and regulation purposes via a regulator, PLC or
monitoring system.
FUNCTION
TDP-S is a pressure transmitter for comfort ventilation systems.
It provides an active current or voltage signal proportional to
the measured air pressure. TDP-S consists of semiconductor
elements. There is no air throughput and the unit is thus
protected against dust in the ventilation
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.
TECHNICAL DATA
Full scale pressure range . . . . . . .0-2500 Pa
Possible settings . . . . . . . . . . . . . . . .see fig.4
Supply voltage . . . . 24 V AC ±15%, 50/60 Hz
Own consumption (-20/+40°C) . .max. 0,5 VA
Output signal (selectable) . . . . . . . 0-10 V DC
4-20 mA, 0-20 mA
Accuracy output signal . . . . . . . . . . . . . . . . . .
1,5%xMV+0,3%xSR+2,5Pa
(MV=measured value/SR=set measuring range)
Dampening (selectable) . . . . . . . 0.4 s or 10 s
Max. pressure . . . . . . . . . . . . . . . . . . .20 kPa
Ambient temperature . . . . . . . . . . -20/+40°C
(constant operation)
-30/+50°C (transient)
Dimensions . . . . .75 x 36 x 91 mm (see fig.1)
Cable dimensions . . . . . . . 4 x max. 1.5 mm
Pressure connector . . . . . . . . . . 2 x ø6.2 mm
Enclosure . . . . . . . . . . . . . . . . . . . . . . . . IP54
MOUNTING
TDP-S must be securely mounted on a level surface using
screws. TDP-S is insensitive to mounting orientation. However,
in order to maintain the specified enclosure, 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
green LED 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
system.
The pressure
13.5-28 V DC
2-10 V DC
2
terminal 4) depending on the desired output signal (Figs. 3 and 5).
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
separate from mains-carrying cables as voltage signals from
these may affect transducer function.
SETTINGS
The pressure range is set by turning the dial SW2 (fig 3) and can
be set to 8 different intervals from -50/+50Pa to 0-2500Pa (fig.4).
If the dial is set to values other than the specified positions (0-7),
the pressure transmitter will interpret the setting as position 7
corresponding to the highest pressure range. If the transducer is
unintentionally set to lower pressure range than the pressure to
be measured, the green LED will light constantly (see table 1).
Whether the output signal is in V or mA, and the minimum value
of the output signal are selected by the DIP1 (SW1). See figs 3
and 5.
The damping time is set with a DIP2 (SW1). See figs 3 and 6. 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 transducer output
signal.
ZEROING
The transducer can be zeroed after it has been mounted and the
power supply connected. 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 yellow LED
is constantly lit, the transducer is measuring a differential
pressure of more than 50 Pa. This may be caused by unintended
pressure within the system (draughts or compressed tubing). 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 and flashes when the actual pressure is above or below
the selected measuring range. The yellow LED is lit if pressure
exceeds 50 Pa and flashes for approx. 3 seconds during zeroing.
LED on
On
Flashing
Green
OK
Pressure outside set
range
Yellow
>50Pa
Zeroing in progress
Table 1
FIGURES
Figure 1: Dimensioned sketch
Figure 2: Transducer position in relation to bends and branches
Figure 3: Wiring diagram
Figure 4: Pressure range selection
Figure 5: Output signal selection
Figure 6: Damping time selection
Figure 7: Free DIP switch (not used)
Off
No supply
<50Pa
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