HD21ABE17 Air Quality Meter


Delta Ohm


Portable measuring data logger for measuring and logging CO, CO2, Atmospheric Pressure, Temperature and Humidity.

890,00 €

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Type of Instrument Air Quality Analyzer
The instrument measures: Air Quality

The HD21AB Data Logger measures:
• Carbon Dioxide CO2
• Carbon Monoxide CO
• Atmospheric Pressure
• Temperature
• Relative Humidity
And it Calculates:
• Dew Point
• Wet Bulb Temperature
• Absolute Humidity
• Mixing Ratio
• Enthalpy

HD21AB17 is a dataloggers with a memory capacity of 67600 recordings, divided in 64 blocks. Used the DeltaLog10 software from version
Reference Standards: ASHRAE 62.1 – 2004, Legislative Decree 81/2008.
These regulations apply to all confined spaces that could be used by people.
Kitchens, baths, changing rooms and swimming pools are included, due to the presence of high humidity.
You should take into account, in regard to air quality, possible chemical, physical and biological contaminants.
The instruments have a wide Dot Matrix graphic display with a resolution of 160x160 dots.

Typical Applications:
• Measurement of IAQ (Indoor Air Quality) and comfort conditions in schools, offices and indoor spaces.
• Analysis and study of the Sick Building Syndrome, and of the resulting consequences.
• Checking the HVAC (Heating, Ventilation and Air Conditioning) system efficiency.
• Examination of IAQ conditions in factories to optimize microclimate and improve productivity.
• Building Automation checks.

Technical data of the sensors

CO2 Carbon Dioxide
NDIR Dual Wavelength
Measurement range 0 … 5000ppm
Sensor working range -5 … 50°C
Accuracy ±50ppm+3% of measurement
Resolution 1ppm
Temperature dependence 0.1%f.s./°C
Response time (T90) < 120 sec (air speed = 2m/sec)
Long-term stability 5% of measurement/5 years

CO Carbon Monoxide
: Electrochemical cell
Measurement range: 0 … 500ppm
Sensor working range: -5 … 50°C
Accuracy: ±3ppm+3% of measurement
Resolution: 1ppm
Response time (T90): < 50 sec
Long-term stability: 5% of measurement/year
Service life: > 5 years in normal environment conditions

Atmospheric Pressure Patm
Type of sensor:
Piezo-resistive :
Measurement range: 750… 1100 hPa
Accuracy: ±1.5 hPa @ 25°C
Resolution: 1 hPa
Long-term stability: 2hPa/year
Temperature drift: ±3hPa with temperature -20 … +60°C

Relative Humidity RH
Type of sensor:
Sensor protection: Stainless steel grid filter (on request 20μm sintered filter P6 in AISI 316 or 10μm sintered filter P7 in PTFE)
Measurement range: 0 … 100 % RH
Sensor working range: -20 … +60°C
Accuracy: ±2% (10÷90% RH) ±2.5% in the remaining range
Resolution: 0.1°C
Temperature dependence: ±2% on all temperature range
Hysteresis and repeatability: 1% RH
Response time (T90): < 20 sec (air speed = 2m/sec) without filter
Long-term stability: 1%/year

Temperature T
Type of sensor:
NTC 10kΩ
Measurement range: -20 … +60°C
Accuracy: ±0.2°C ±0.15% of measurement
Resolution: 0.1°C
Response time (T90): < 30 sec (air speed = 2m/sec)
Long-term stability: 0.1°C/year

Dimensions (Length x Width x Height):  
210x90x40 mm (HD21AB)
Weight: 470 g (batteries included)
Materials: ABS, rubber
Display: Backlit, Dot Matrix 160x160 dots, visible area 52x42 mm

Operating conditions
Operating temperature: -5…50°C
Storage temperature: -25…65°C
Working relative humidity: 0 … 85% RH without condensation
Instrument uncertainty: ± 1 digit @ 20°C

Mains adapter: (code SWD10) 12Vdc/1A
Batteries: 4 x 1.2V Ni‑MH rechargeable batteries AA type
Autonomy: 8 hours of continuous use in measure mode
Power absorbed with instrument off:  < 45μA

Security of stored data:  Unlimited

Serial interface
Type: USB 1.1 or 2.0 not insulated
Baud rate: 460800
Data bits: 8
Parity: None
Stop bits: 1
Flow control: Xon-Xoff
Cable length: Max 5 m

Memory: Divided in 64 blocks.
Storage capacity: 67600 recordings.
Logging interval Selectable among: 15, 30 seconds, 1, 2, 5, 10, 15, 20, 30 minutes and 1 hour.

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