Item #: DO HD45
Our Price: $310.00
Sensor Configuration  
Output Options  
Include Serial Cable  

Description  more details

  • CO2, Temp, RH, Dew Point
  • LCD Display
  • LED Indicators
  • Analog Outputs
  • Relay Outputs
  • User settable alarms
  • Modbus RS485
  • Custom configurations on request
  • PDF Data Sheet

The instruments of the series HD45 and HD46 are transmitters, indicators and regulators,  to  monitor  and  control:
• Relative humidity (RH)
• Ambient temperature (T)
• Carbon dioxide (CO2)
• Dew point temperature (DP, calculated measurement)
They are suitable for monitoring indoor air quality. Typical  applications would be air  quality  in institutuional buildings, factories and workplaces where there  are  large gatherings of  people  (schools,  hospitals,  auditoriums,  cafeterias,  etc.) The instrument facilitates the automatic  adjustment of air conditioning (temperature and humidity) and ventilation (changes air/hour) in order to achieve  good air quality according to the ASHRAE and IMC standards as well as promoting energy savings. The  measurement  of  RH  (Relative  Humidity)  is  done  with  a  capacitive sensor.  In  models  HD46 ...  the  relative  humidity  and  temperature  sensor  with their  calibration  data  are  contained  within  an  easily  replaceable  module.  The instrument can also calculate  the dew point. The temperature T is measured with a high precision NTC sensor.The  measurement  of  CO2  (carbon  dioxide)  is  obtained  with  a  special  infrared sensor (NDIR technology: Non-Dispersive Infrared Technology), A protective membrane,  protects  the  sensor  from dust and weather. The instruments are factory calibrated and require no further adjustment by the installer. The optional serial connection cable includes a built in USB adapter and mini USB connector to connect between the instrument and a PC

Sensor Capacitive NTC 10kΩ Dual Wavelength NDIR
Range 0...100 % RH-40...+85°C Dew point Td -30...+85°C (-22...+185°F) 0-5000ppm
Accuracy ±2.5%RH (0..90%RH)±2%RH (elsewhere) for T=15...35°C±(1.5+1.5% of the measure)%RH for T=40...+80°CFor the dew point please see the relevant tabl ±0.2°C ±0.15% of the measured value within 0...70°C±0.3°C ±0.15% of the measured value within -30...0°C and 70...85°C
(for models with 4-20mA ±0.5°C ±0.15% of the measured value within -30°C...+85°C)
±(50ppm+3% of the measured value) @ 20°C and 1013hPa
Resolution 0.1% 0.1°C 1 ppm
Response time <20 sec.(air speed = 2m/sec and stable temperature <30 sec. (air speed = 2m/sec) <120 sec.(air speed = 2m/sec and stable temperature
Long Term Stability 1%/year 0.1°C/year 5% of the measured value /5year
Temperature Dependence 2% on the whole temperature range - 0.1%f.s./°C
Hysteresis and repeatability 1% RH - -
Measuring Frequency 1 sample every 3 seconds
Storage Capacity

2304 Records

Storage Interval Selectable within 30s, 1m, and 5mThe stored values represent the average values of samples collected every 3 seconds in selected storage interval
Serial Output Selectable within 30s, 1m, and 5m
The stored values represent the average values of samples collected every 3 seconds in selected storage interval
Analogue Output 0...10Vdc (RL > 10kΩ) (only HD45...V...and HD46...V)
11Vdc outside the measuring range
4÷20mA (RLMAX = 400Ω) (only HD45_A and HD46_A)
22mA out of the measuring range
Active current outpu
Relay Output Two-state (only HD45...R and HD46...R)
Contact: max 1A @ 30Vdc resistive load
Power Supply 24Vac ± 10% (50...60Hz) or 15...35Vdc
Power Consumption 100 mW (except of the models with current output)
400 mW (for the models with current outpu
Stabilizing Time 15 m
Working temperature 0°C -50°C
Working Humidity 0-90%RH non condensing
Protection class IP30
Case Dimensions 80 x 80 x 30 mm (HD45.17...)
80 x 80 x 34 mm (HD45.B... and HD45.7B...)
120 x 80 x 30 mm (HD46.17...)
120 x 80 x 34 mm (HD46.17B...
weight 30 g


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