Produal - Duct CO2 Transmitter - HDK 10K Series Produal - Duct CO2 Transmitter - HDK 10K Series
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HDK - Duct CO2 transmitter / controller

Description: HDK transmitters are specifically engineered for detecting and managing carbon dioxide concentration, temperature, and humidity within ventilation ducts. This information is instrumental in implementing demand-based ventilation control strategies. The device features a user-friendly interface where measurement values scroll on the N model display, with the option to lock the desired value for continuous viewing.

The HDK transmitter utilizes an automatic CO2 measurement calibration function (ABC algorithm) to mitigate potential long-term drift, ensuring accurate and reliable readings over time. Additionally, the transmitter can be customized with a HD-R relay (24 Vac, 1 A) for added control capabilities.

Technical Specifications:

  • Supply:

    • 24 Vac/dc (22…28 V), < 2 VA
  • CO2 Measurement:

    • Range: 0...2000 ppm
    • Range (10K models): 0...10000 ppm
    • Accuracy (25 °C):
      • Typical ±40 ppm +3 % from reading (automatic calibration)
      • Typical ±200 ppm +3 % from reading (automatic calibration) for 10K models
    • Long-term Stability/year: < 2 % FS (automatic calibration)
    • Time Constant: < 2 min
  • Temperature Measurement:

    • Range: 0...50 °C
    • Accuracy (25 °C): ±0.5 °C
  • Humidity Measurement (RH models):

    • Range: 0…100 %rH
    • Accuracy (25 °C): ±2 %rH
  • Outputs:

    • 0...10 V / 2...10 V / 0...5 V, < 2 mA
  • Measuring Probe:

    • Diameter: Ø10 mm x 110 mm; duct insulation < 75 mm
  • Cable Entry: M16

  • Communication (M models): Modbus RTU

  • Operating Conditions:

    • Temperature: 0...50 °C
    • Humidity: 0...85 %rH (non-condensing)
    • Storage Temperature: -20...70 °C
  • Wiring Terminals: 1.5 mm², tilted screw terminals

  • Housing: IP54, cable entry downwards

  • Dimensions (w x h x d): 105 x 104 x 155 mm

Part Numbers:
HDK 10K - Co2 Transmitter Duct 10K Ppm
HDK 10K-N - Co2 Transmitter Duct 10K Ppm +D
HDK 10K-RH - Co2 Transmitter Duct 10K Ppm +Rh
HDK 10K-RH-N - Co2 Transmitter Duct 10K Ppm +Rh+D
HDK 10K-M - Co2 Transmitter Duct 10K Ppm +Mb
HDK 10K-M-N - Co2 Transmitter Duct 10K Ppm +Mb+D
HDK 10K-M-RH - Co2 Transmitter Duct 10K Ppm+Mb+Rh
HDK 10K-M-RH-N - Co2 Transmitter Duct 10K Ppm+Mb+Rh


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