Data Sheet

HD2903T…; HD29V3T…; HD2937T…
HD29V37T…; HD29371T…; HD29V371T…
PG16.12
Ø 20
nected to the electronics through a cable.
In the TO version, the duct probe is fixed to the electronics enclosure and it is
available in three different lengths. To fix the probe to the duct, you can use, for
example, the HD9008.31.12 flange, 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.
Common technical specifications Notes
Air speed Measuring range
0.05…1m/s
0.1…2m/s
0.20…10m/s
0.20…20m/s
The measuring range can be
selected by dip-switch.
Air speed Accuracy
range 0…1m/s
range 0…2m/s
range 0…10m/s
range 0…20m/s
±(0.1m/s+3% of measurement)
±(0.15m/s+3% of measurement)
±(0.5m/s+3% of measurement)
±(0.7m/s+3% of measurement)
at 50%RH and 1013hPa
Temperature Measuring range -10…+60°C
HD2937, HD29V37, HD29371
and HD29V371 models
Temperature Accuracy
±0.3°C
Relative Humidity Measuring
range
0…100%RH
HD29371 and HD29V371
models
Relative Humidity Accuracy
±1,5%RH (10…90%RH)
±2,0%RH (in the remaining
range) for T= 15…35°C
---------------
±(1,5+1.5% of the
displayed value) %RH in the re-
maining temperature range
Relative Humidity Output Range 0…100%RH
Output
(according to the models)
4…20mA
0…10Vdc
R
L
< 500Ω
R
L
> 10kΩ
Power supply
18…40Vdc or 12…24Vac±10%
Response time
(selected by jumper)
0.2s
2.0s
Fast
Slow
Operating temperature
electronics
probe
0…+60°C
-10…+80°C
Compensation temperature 0…+80°C
Storage temperature -10…+70°C
Electronics protection class IP67
Sensor working conditions Clean air, RH<80%
Case dimensions 80x84x44 Without probe
Model description
Model Output Measured parameters
4…20mA 0…10Vdc Air speed Temperature Relative Humidity
HD2903T...
ü ü
HD29V3T...
ü ü
HD2937T...
ü ü ü
HD29V37T...
ü ü ü
HD29371T...
ü ü ü ü
HD29V371T...
ü ü ü ü
HD2903T…, HD29V3T…, HD2937T…, HD29V37T…
HD29371T…, HD29V371T…
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 pharmaceuti-
cal, 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 film, the probe sheath is AISI304, the filter
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 con-