A unit of AKRIBIS One
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HDH-Passive-Series

Room CO2 Transmitter HDH-Passive

The HDH-Passive transmitters with passive temperature measurement can measure and control carbon dioxide concentration and temperature in room spaces. The -RH models also measure and control relative humidity. You can use the measurement data for demand-based ventilation control.

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Room CO2 Transmitter HDH-Passive

The transmitter measures temperature with a passive sensor (NTC 20) and an active sensor. It has a resistance output for the passive sensor data and a voltage output for the active sensor data. In addition, the transmitter has one scalable voltage output for CO₂ measurement data. The -RH models also have a scalable voltage output for relative humidity.

The transmitter has one control output. The controller can control the output according to one measurement value or according to the maximum selection of all values.

ABCLogic™ self-calibration method eliminates the possible long term drift.

The controller settings and options' limits can be changed by using the ML-SER tool.

Technical data

Power supply24 Vac/dc (22...28 V), < 2 VA
Time constant< 2 min
CO₂ measurement range0...2000 ppm
CO₂ measurement accuracytyp. ±40 ppm +3 % of value
Temperature measurement range0...50 °C
Temperature measurement accuracy±0.5 °C (25 °C)
CO₂ output0...10 Vdc, 2 mA
Temperature output0...10 Vdc, 2 mA
Relay outputNone
IP protection classIP20
Ambient temperature0...50 °C
Ambient humidity0...85 %rH
Product dimensions (w x h x d)87 x 86 x 30 mm
Mountingon the wall surface or on a flush mounting box (60 mm hole distance)
MaterialsABS plastic

Configure the instrument

Choose the model, probes and accessories. Incompatible combinations are blocked as you go; the remaining rules are checked when the instrument is added to the quote.

Documents

  • ML-SER

    Configuration tool ML-SER

    ML-SER commissioning tool is designed for easy commission and configuration of Produal first-generation transmitters. The ML-SER shows…