HD2903T HD29V3T HD2937T HD29V37T HD29371T HD29V371T_1
HD2903T HD29V3T HD2937T HD29V37T HD29371T HD29V371T_2

HD 2903T, HD 29V3T, HD 2937T, HD 29V37T, HD 29371T, HD 29V371T – Temperature, Relative Humidity and Air Speed Transmitters

The family of transmitters series HD29 … are employed in the control of air
speed in the air conditioning and ventilation (HVAC / BEMS) in the pharmaceutical,
museum, clean rooms, ventilation ducts, industrial sectors and households,
crowded places, cafeterias, auditoriums, gymnasiums or on farms with large
numbers of animals. The sensors in combination with an accurate electronics
guarantee precise and reliable measurements in the time.
The sensor for the air speed is thin fi lm, the probe sheath is AISI304, the fi lter
relative humidity of 20μ wire mesh, materials that allow the use in hostile areas.
There are two possible installations: in the TO version, the horizontal probe is
joined to the electronics enclosure while in the TC version the probe is connected
to the electronics through a cable.
In the TO version, the duct probe is fi xed to the electronics enclosure and it is
available in three different lengths. To fi x the probe to the duct, you can use, for
example, the HD9008.31.12 fl ange, a 3/8” universal biconical connection or a
PG16.12 metal cable gland (Ø10…14mm).
In the TC version, the probe together with the sensors is equipped with a cable
which can be 2, 5 or 10 meters long. The probes are available in three different
lengths.

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Product Description

The family of transmitters series HD29 … are employed in the control of air
speed in the air conditioning and ventilation (HVAC / BEMS) in the pharmaceutical,
museum, clean rooms, ventilation ducts, industrial sectors and households,
crowded places, cafeterias, auditoriums, gymnasiums or on farms with large
numbers of animals. The sensors in combination with an accurate electronics
guarantee precise and reliable measurements in the time.
The sensor for the air speed is thin fi lm, the probe sheath is AISI304, the fi lter
relative humidity of 20μ wire mesh, materials that allow the use in hostile areas.
There are two possible installations: in the TO version, the horizontal probe is
joined to the electronics enclosure while in the TC version the probe is connected
to the electronics through a cable.
In the TO version, the duct probe is fi xed to the electronics enclosure and it is
available in three different lengths. To fi x the probe to the duct, you can use, for
example, the HD9008.31.12 fl ange, a 3/8” universal biconical connection or a
PG16.12 metal cable gland (Ø10…14mm).
In the TC version, the probe together with the sensors is equipped with a cable
which can be 2, 5 or 10 meters long. The probes are available in three different
lengths.

Installation notes
• The window of the sensor (or of the sensors) must be oriented in the direction
of fl ow. To facilitate the proper positioning of the probe, eg. inside of a pipe, a
graduated scale, engraved along the stem, indicates the depth of introduction
of the window speed sensor in the channel. To properly orient the sensor to the
fl ow, once introduced into the channel, the air speed window and line on the
base of the scale are on the same axis.

• To fi x the probe inside a ventilation duct, a pipe , etc. you can use, for example,
HD9008.31.12 fl ange, a PG16.12 metal cable gland (Ø10…14mm) or a 3/8”
universal biconical connection.

• The transmitters are factory calibrated and no further adjustments are required.
• To select the air speed output range by using the dual dip-switch on the
board, please see the chart below:

• Dip-switch should always be at the end of its fi nal limit in both directions.

• The jumper on the board selects an integrated response time in 0.2s in the
FAST position and in 2s in the SLOW position. Please set the integration
time at SLOW in case of turbulence, otherwise please select the FAST
position.

Electrical connections
Power supply
Power the instrument at the voltage shown in the electrical specifi cations: power
supply terminals are marked as +Vdc and GND.
Analogue output
According to the model, the output signal comes from:
• VEL and GND terminals for air speed transmitters,
• VEL and GND, Temp and GND terminals for temperature / air speed transmitters,
• VEL and GND, Temp and GND, %RH and GND terminals for temperature / relative
humidity / air speed transmitters.

HD2903T… and HD29V3T… ORDERING CODES
HD2903T…: Active transmitter for measuring air speed in ducts, 4…20mA output.
AISI 304 steel probe, diameter 12mm, compact unit HD2903TO… version with
probe joined to the electronics enclosure, HD2903TC… version with probe
connected to the electronics through a cable. Air speed range 0.05…1m/s –
0.1…2m/s – 0.20…10m/s – 0.20…20m/s selected by jumper. Power supply
16…40Vdc or 12…24Vac. Air probe operating temperature -10…+80°C.
HD29V3T…: Active transmitter for measuring air speed in ducts, 0…10Vdc output.
AISI 304 steel probe, diameter 12mm, compact unit HD29V3TO… version
with probe joined to the electronics enclosure, HD29V3TC… version
with probe connected to the electronics through a cable. Air speed range
0.05…1m/s – 0.1…2m/s – 0.20…10m/s – 0.20…20m/s selected by jumper.
Power supply 16…40Vdc or 12…24Vac. Air probe operating temperature
-10…+80°C.

HD2937T… and HD29V37T… ORDERING CODES
HD2937T…: Active transmitter for measuring air speed and temperature in
ducts, 4…20mA outputs. AISI 304 steel probe, diameter 12mm, compact
unit HD2937TO…version with probe joined to the electronics enclosure,
HD2937TC…version with probe connected to the electronics through a cable.
Air speed range 0.05…1m/s – 0.1…2m/s – 0.20…10m/s – 0.20…20m/s
selected by jumper, fixed temperature range ‑10…+60°C. Power supply
16…40Vdc or 12…24Vac. Air probe operating temperature -10…+80°C.
HD29V37T…: Active transmitter for measuring air speed and temperature in
ducts, 0…10Vdc outputs. AISI 304 steel probe, diameter 12mm, compact
unit HD29V37TO…version with probe joined to the electronics enclosure,
HD29V37TC… version with probe connected to the electronics through a cable.
Air speed range 0.05…1m/s – 0.1…2m/s – 0.20…10m/s – 0.20…20m/s
selected by jumper, fixed temperature range ‑10…+60°C. Power supply
16…40Vdc or 12…24Vac. Air probe operating temperature -10…+80°C.

HD29371T… and HD29V371T… ORDERING CODES
HD29371T…: Active transmitter for measuring air speed, temperature and
relative humidity in ducts, 4…20mA outputs. AISI 304 steel probe, diameter
14mm, compact unit HD29371TO version… with probe joined to the
electronics enclosure, HD29371TC… version with probe connected to the
electronics through a cable. Air speed range 0.05…1m/s – 0.1…2m/s
– 0.20…10m/s – 0.20…20m/s selected by jumper, fixed temperature
range ‑10…+60°C, relative humidity range 0…100%RH. Power supply
16…40Vdc or 12…24Vac. Air probe operating temperature ‑10…+80°C.
HD29V371T…: Active transmitter for measuring air speed, temperature and
relative humidity in ducts, 0…10Vdc outputs. AISI 304 steel probe, diameter
14mm, compact unit HD29V371TO…version with probe joined to the
electronics enclosure, HD29V371TC… version with probe connected to the
electronics through a cable. Air speed range 0.05…1m/s – 0.1…2m/s –
0.20…10m/s – 0.20…20m/s selected by jumper, fixed temperature range
‑10…+60°C, relative humidity range 0…100%RH. Power supply 16…40Vdc
or 12…24Vac. Air probe operating temperature ‑10…+80°C.

 

 

 

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Manuals and Brochures here.  

HD2903T.pdf

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