Airflow control depends on stable, correctly positioned measurement points. HD29 transmitters measure air speed and, depending on the model, temperature and relative humidity for HVAC, BEMS, clean rooms, industrial facilities, museums, pharmaceutical environments and other ventilation monitoring tasks.
Installation adapts to the duct and enclosure layout. Fixed horizontal probes suit streamlined duct mounting, while cable-connected probes offer flexibility in complex setups. The stainless steel probe stem, engraved depth scale and airflow orientation reference support correct positioning, with IP65 protection for the transmitter housing.
The series integrates into both analog and digital systems. Models are available with active 4…20 mA, 0…10 Vdc or RS485 output using Modbus-RTU or ASCII proprietary protocol. Analog versions offer selectable speed ranges up to 20 m/s, while digital models cover 0.05…20 m/s and provide 0.01 m/s speed resolution.
The series offers fixed duct horizontal probes and probes with M16 connector and cable. Stem lengths vary by measured quantities and probe type.
Air speed is measured with a thermal thin-film sensor. Temperature uses an NTC sensor, and relative humidity versions use a capacitive sensor.
Analog models use a Fast/Slow jumper for 0.2 s or 2 s response. HD29S models offer a configurable filtering factor for air speed measurement.
HD29A and HD29V models allow the air speed range associated with the analog output to be selected by dip switches.
HD29S models can output air speed, temperature, relative humidity, dew point, absolute humidity, wet bulb temperature and error status via RS485.
Ø 12 mm and Ø 14 mm probes can be fixed to ducts using compatible wall flanges or AISI304 cable glands.
Code: HD29 [1] [2] [3]
Example: HD29A371TC102
[1] Output
A = active 4…20 mA analog output
V = 0…10 V analog output
S = RS485 digital output
[2] Measured quantities
300 = air speed
370 = air speed and temperature
371 = air speed, temperature and relative humidity
[3] Type of probe and stem length (*)
TO1 = horizontal fixed probe, short stem
TO2 = horizontal fixed probe, medium stem
TO3 = horizontal fixed probe, long stem
TC102 = probe with 2 m cable, short stem
TC105 = probe with 5 m cable, short stem
TC110 = probe with 10 m cable, short stem
TC202 = probe with 2 m cable, medium stem
TC205 = probe with 5 m cable, medium stem
TC210 = probe with 10 m cable, medium stem
TC302 = probe with 2 m cable, long stem
TC305 = probe with 5 m cable, long stem
TC310 = probe with 10 m cable, long stem
