HD37 - CO2/CO2 and Temperature Transmitters

Brand: Delta OHM S.R.L.

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HD37 - CO2/CO2 and Temperature Transmitters

Brand: Delta OHM S.R.L.

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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

Brand

Delta OHM S.R.L.

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)

4-20 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 x 84 x 44 mm
Probe excluded

Documentation

Datasheet

DeltaOHM HD37BT Transmitters Datasheet pdf

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