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)
This page deals with a specific configuration of model HD46 for combined RH, Temperature and CO2 with a display and keyboard interface with an optional Modbus serial interface and relay. Other Configurations are hereThey 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
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