passive transducer for temperature, humidity and dew point | HD 49...

general information:

The series of transducers HD49... is used to measure temperature, relative humidity and the dew point temperature. Versions only with standard analog output or only with RS485 output with MODBUS‑ RTU protocol are available. The models with analog output provide a signal that is suitable for transmission to a remote display, recorder or PLC. The models with RS485 output are suitable for connection to a PC or PLC.

The models of the HD49.. series are passive transducers and thus suitable to be inserted in a 4...20 mA current loop.

The series of transducers HD49... has been designed for temperature and humidity control in conditioning and ventilation applications (HVAC/BEMS) in the following sectors: pharmaceutical sector, museums, clean rooms, ventilation ducts, industrial and civil sectors, crowded places, canteens, auditoria, gyms, high-density farms, greenhouses, etc.

The HD49... transducers measure relative humidity with a well proven temperature compensated capacitive sensor that assures precise and reliable measurements. The series HD49... is available in two temperature ranges: standard: -20°C to +80°C and extended: -40°C to +150°C for critical applications. A 20 μm filter made of stainless steel protects the sensor against dust and particles (other filters are available for different applications).

The transducers are factory calibrated and no further adjustments are required.

Each series is available in three different versions: with horizontal probe for duct mounting (HD49...TO...), with vertical probe for wall mounting (HD49...TV...) or with remote probe connected to the transducer via cable (HD49...TC...), available cable lengths are 2, 5 and 10 m. The probes can be supplied in two different lengths (135 mm or 335 mm).

specifications:

relative humidity:
sensor:	capacitive
measuring range:	0 % to 100 % r.h.
accuracy at T = 15…35°C:	±1.5 % r.h. (0…90 % r.h.), ±2.0 % r.h. (90…100 % r.h.)
accuracy remaining T range:	±(1.5+1.5 % of measured value) % r.h.
repeatability:	0.4 % r.h.
working temperature of sensor:	-20°C to +80°C (optional: extended range: -40°C to +150°C)

temperature:
measuring range:	-20°C to +80°C, (optional: extended range: -40°C to +150°C)
sensor:	NTC 10 kΩ (optional: extended range: Pt 100 class A)
accuracy:	±0.3°C (0…+70°C) ±0.4°C (-20...0°C, +70…+80°C) (optional: extended range: ±0.3°C)
repeatabality:	0.05°C

dew point:
sensor:	parameter calculated from relative humidity and temperature
measuring range:	-20°C to +80°C dew point
accuracy:	p.r.t. tab. 1 (data sheet)
repeatability:	0.5°C dew point

output:	depending on version: - 4 mA to 20 mA analog output (HD 4807...) - 0 V DC to 10 V DC analog output (HD 48V07...) - RS485 output with MODBUS-RTU protocol (HD 48S07...)
power supply:	12...40 V DC
electrical connections:	screw type terminal block, max 1.5 mm², M16 cable gland for input cable
working temperature of ...TV probe:	-20°C to +80°C
working temperature of ...TO, ...TC probe:	-20°C to +80°C (optional: extended range: -40°C to +150°C)
storage temperature:	-20°C to +80°C
ingress protection - electronics:	IP 66