Senseca
HD29 Air Speed Transmitter
Overview
The HD29 series of transmitters is designed for air speed monitoring in HVAC, BEMS and a wide range of specialized environments, including the pharmaceutical sector, museums, clean rooms, industrial facilities, public spaces such as gymnasiums and auditoriums, and agricultural applications such as livestock farms.
Integrated sensors paired with high-precision electronics deliver accurate, reliable air speed, temperature and humidity measurements over time. Probes are available fixed to the enclosure or connected by cable, with robust mounting accessories for different installations. The transmitters are factory calibrated and ready to use.
Key Features
- Measures air speed, with optional temperature and relative humidity
- Output versions: active 4…20 mA (HD29A), 0…10 Vdc (HD29V), RS485 Modbus-RTU or ASCII (HD29S)
- Output range selected by DIP switch or digital command
- FAST or SLOW integration time, set to suit turbulence conditions
- Duct probe fixed to the enclosure, or cable-connected probe with different cable lengths
- Graduated scale engraved along the stem for accurate positioning in ventilation ducts
- AISI304 stainless steel stem and wire mesh filter
- Factory calibrated, with recalibration only needed when replacing probes
Specifications
Measurement
| Sensors | Speed: thermal; temperature: NTC; relative humidity: capacitive |
| Air speed range (HD29A and HD29V) | Configurable: 0.05…1 m/s, 0.1…2 m/s, 0.2…10 m/s or 0.2…20 m/s |
| Air speed range (HD29S) | 0.05…20 m/s |
| Temperature range | -10…+60 °C |
| Relative humidity range | 0…100% |
| Air speed accuracy (HD29A and HD29V, at 50% RH and 1013 hPa) | Range 1: ±(0.1 + 3% of measured value) m/s; Range 2: ±(0.15 + 3%) m/s; Range 3: ±(0.5 + 3%) m/s; Range 4: ±(0.7 + 3%) m/s |
| Air speed accuracy (HD29S) | ±(0.1 + 3% of measure) m/s up to 1 m/s; ±(0.15 + 3%) m/s up to 2 m/s; ±(0.5 + 3%) m/s up to 10 m/s; ±(0.7 + 3%) m/s up to 20 m/s |
| Temperature accuracy | ±0.3 °C |
| Relative humidity accuracy | ±1.5% (10…90%) and ±2% (remaining range) at T = 15…35 °C; (1.5 + 1.5% of measured value)% at remaining temperatures |
| Resolution (HD29S) | Speed 0.01 m/s; temperature 0.1 °C; RH 0.1% |
| Air temperature compensation for speed measurement | 0…+80 °C |
General
| Output | Active 4…20 mA (HD29A); 0…10 Vdc (HD29V); RS485 Modbus-RTU or ASCII proprietary protocol (HD29S) |
| Power supply | 24 Vac ±10% or 18…40 Vdc (HD29A and HD29V); 18…30 Vdc (HD29S) |
| Power consumption | < 100 mA (plus output current in HD29A models) |
| Electrical connections | Screw terminal block, max 1.5 mm², PG9 cable gland |
| Operating conditions | -10…+60 °C (transmitter housing); -30…+100 °C (probe). Speed sensor: clean air, RH < 80% |
| Storage temperature | -10…+70 °C |
| Materials | Housing: ABS; front labels: polycarbonate; probe stem: stainless steel |
| Protection degree | IP65 |
Ordering codes
Output: A = active 4…20 mA, V = 0…10 V, S = RS485 digital.
Measured quantities: 300 = air speed only; 370 = air speed and temperature; 371 = air speed, temperature and relative humidity.
Probe: TC1, TC2, TC3 = cable or short-stem probes (cable length 02 = 2 m, 05 = 5 m, 10 = 10 m for TC models); TO1, TO2, TO3 = horizontal fixed probe with short, medium or long stem.
Fixing accessories and PC connecting cable must be ordered separately.
