HD2903T - HD29V3T series Air speed transmitters
HD2937T - HD29V37T series Temperature, Air speed transmitters
HD29371T - HD29V371T series Temperature, Relative Humidity and Air speed transmitters
The HD29 series of transmitters are used for controlling air speed for conditioning and ventilation applications
(HVAC/BEMS) in the following sectors: pharmacy, museums, clean rooms, ventilation ducts, crowded places, canteens, auditoria, gyms or high-density farms, as well as industrial and civil sectors.
Airspeed Humidity Transmitter - Indicator
| Model | Description |
|---|---|
| HD2903 | Temperature, Relative Humidity and Air speed transmitters |
The sensors in combination with an accurate electronics guarantee precise and reliable measurements in the course of time. The thin fi lm sensor for air speed, the AISI304 probe sheath, the 20μ metal grid filter for Relative Humidity enable their usage even for hostile applications. The probes are available in three different lengths.
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 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 flange, a 3/8" universal biconical
connection or a PG16 metal cable gland (Φ 10
- 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.
| Air speed
Measuring range |
0.05…1m/s
0.05…2m/s 0.05…10m/s 0.05…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 |
±(0.04m/s+2% of measurement)
±(0.04m/s+2% of measurement) ±(0.2m/s+3% of measurement) ±(0.2m/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 | 5…98%RH | HD29371 and HD29V371 models |
| Relative Humidity Accuracy | ±2% (5..90%RH), ±2.5% remaining range |
|
| Relative Humidity Output Range | 0…100%RH | |
| Output (according to the models) | 4…20mA
0…10Vdc |
RL < 500Ω RL > 10kΩ |
| Power supply | 16…40Vdc or 12…24Vac±10% | |
| Response time
(selected by jumper) |
0.2s
2.0s |
Fast
Slow |
| Operating temperature
electronics probe |
0…+60°C -30…+100° C |
|
| Compensation temperature | 0…+80°C | |
| Storage temperature | -10…+70°C | |
| Electronics protection class | IP67 | |
| Sensor working conditions | Clean air, RH<90% | |
| Case dimensions | 80x84x44 | Without probe |
| Model | Output | Input | |||
| 4 - 20mA | 0 - 10Vdc | Air speed | Temperature | Relative Humidity | |
| HD2903T... | X | X | |||
| HD29V3T... | X | X | |||
| HD2937T... | X | X | X | ||
| HD29V37T... | X | X | X | ||
| HD29371T... | X | X | X | X | |
| HD29V371T... | X | X | X | X | |