HD37 - CO2/CO2 and Temperature Transmitters

Brand: Delta OHM S.r.l.

The transmitters of the HD37 series are used mainly in air quality control by measuring CO2 (Carbon Dioxide) in the ventilation systems.

This allows you to vary the number of air change per hour according to ASHRAE and IMC norms.

The purpose is twofold: to have a good air quality in the presence of people and to save energy, increasing or decreasing parts of air per hour, depending on the air quality set.

The use is for environments where there is overcrowding of people, discontinuous crowding, cafeterias, auditoriums, schools, hospitals, greenhouses, livestock breeding, etc.

Specifications

CO2 Measurement Principle

  • Double wave length infrared technology (NDIR)

CO2 Measurement Range

  • 0-2000 ppm
  • 0-5000 ppm

CO2 Accuracy

  • f.s. 2000 ppm: ± (50 ppm +3 % of measurement)
  • f.s. 5000 ppm: ± (50 ppm +4 % of measurement)
  • (at 20 °C, 50 %RH and 1013 hPa)

Power Supply

  • 16-40 Vdc
  • 24 Vac ± 10 %

Temperature Measurement Range (Models HD377BT and HD37V7BT)

  • 0 +50° C

Temperature Accuracy (Models HD377BT and HD37V7BT)

  • ± 0.3° C

Analog Outputs (According to the Model)

  • 4 to 20 mA, RL 10 kΩ

Case Material

  • ABS

Absorption

  • < 2 W

Startup Stabilization Time

  • 15 Minutes
  • To guarantee the stated accuracy

Response Time τ63%

  • 120 seconds
  • Wind speed of at least 1 m/s

Temperature Effect %

  • 0.2 %/°C CO2
  • Typical value

Atmospheric Pressure Effect

  • 1.6 %/kPa
  • Deviation compared to the value at 101 kPa

Long-term Stability

  • 5 % of the range / 5 years
  • Typical value

Calibration

  • At one point at 0 ppm
  • 400 ppm clear air
  • Automatic detection of theapplied CO2 level

Operating Conditions

  • -5 to +50 °C
  • 0 to 90 %RH
  • Without condensation

Storage Conditions

  • -10 to +60 °C
  • 0 to 90 %RH
  • Without condensation

IP Electronics

  • TV models: IP21
  • TC models: IP65 (Probe Excluded)

Case Size

  • 80 × 84 × 44 mm
  • Probe excluded

Documentation

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