C-21, VOC Gas Sensor with audible Alarm

Item number: C-21

  • continuous monitoring and alarm device for volatile hydrocarbons
  • only a few seconds response time
  • very easy installation and operation
  • semiconductor sensor reduces maintenance to a minimum
  • operation via power supply or integrated rechargeable battery (2h operation)
  • analogue output 0-2 VDC and transistor switching output for remote alarm
  • Category: Indoor Air Pollutants

    451,01 €

    including 19% VAT.

    Exp. shipping time: ca. 2-3 weeks

    : 7 workdays



    C-21, VOC Gas Sensor with audible Alarm

    This VOC monitor C-21 is used for continuous monitoring of the ambient air for volatile hydrocarbons, solvents, etc.
    VOCs (volatile organic compounds) are found for example, in detergents and solvents. The presence of high concentrations over an extended period of time can cause health damage.

    The VOC concentration in the air is indicated by a colored LED line on the C-21, and an alarm sound warns if the concentration of volatile hydrocarbons in the air is hazardous to health. The sensor is very sensitive to VOCs and solvent vapors, such as methylene chloride, acetone, naphtha, perchlorethylene and trichlorethylene.

    • Very easy to install.
    • The operation is simple and requires no special knowledge.
    • No need for maintenance.
    • Operation via power supply or built-in rechargeable battery.
    • Portable device: Battery for two-hour use without mains connection.

    Areas of application: Anywhere  where gases and vapors of volatile hydrocarbons such as solvents are found:
    In surface treatment plants, paint shops, joinery and painting companies, printing plants, laboratories, laundries, chem. ('' PER ''), chemical plants etc., as well as for the verification of activated carbon filters.

    Not suitable for use in hazardous areas!

    Technical data:
    Measuring principle: Solid state sensor (HMOS = heated metal oxide semiconductor)
    Measuring range: Full scale = 50-100 ppm for most solvent based VOCs
    Coloured bargraph display: Green = normal. Yellow = caution. Red = danger
    Alarm tone and ON/OFF switch
    Interface with analogue and ON/OFF signal for data loggers and control of a remote alarm system or other equipment.
    Response time: Less than one minute
    Dimensions: 85 × 35 × 60 mm³
    Weight: 140 g
    Power requirements: 12 VDC at 300 mA.
    European AC adapter supplied with the device
    Rechargeable attery: Approximately 2 hour capacity. Recharged by AC adapter overnight

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