VOC Monitor

Total hydrocarbon analyzer

Introduction to total hydrocarbon analzer

FORBIX SEMICON total hydrocarbon analyzer measures presence of volatile hydrocarbons in the air. It gives a collection concentration reading of TVOC gases (usually in vapour form). Hydrocarbons like, Benzene, Xylene, Toluene, Smoke, Alcohol. Also LPG, Formaldehyde, PVC solvents have considerable amount of hydrocarbons. Hydrocarbons is present in petrol, CNG, Diesel, IPA, gluing, bonding agents as well.

Following is the relative sensitivity of the vapours:

  • LPG / CNG – highly sensitive
  • Benzene – highly sensitive
  • Toluene and Xylene – moderate sensitive
  • Smoke – highly sensitive
  • Alcohol – highly sensitive
  • IPA – moderate sensitive
  • Formaldehyde (HCHO) – less sensitive
  • Petrol / Diesel – highly sensitive
  • PVC solvents, glue and bonding agents – highly sensitive

    Total hydrocarbon analyzer

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    VOC readings on the monitor

    Concentration of gases shown in ppm (parts per million) 0-800 ppm. Air quality index is shown as the following (left hand bottom):

  • 0-10 ppm [GOOD]
  • 10-20 ppm [NORMAL]
  • 20-30 ppm [POOR]
  • Above 30 ppm as [ALARM]
  • The beeping sound / alarm in the unit has been permanently removed from the newer models, after repeated feedback from customers.

    The unit is a table-top sensing unit with LCD. To start the machine, first keep it in a fresh room make sure the reading are stable at 0 ppm. It takes a booting time of around 30 seconds for power up (before the 1st reading appears). Soon after that the readings will show the for the ambient room conditions.

    This monitor shows the reading of odour in a ambient air. The odour may be fresh or even stinking. The unit can convert smell into electrical values. The monitor captures the odour particles from the air and converts into electrical impulses. The electrical pulses then are converted to ppm readings that is displayed.

    FORBIX SEMICON total hydrocarbon analyzer

    Total hydrocarbon analyzer

    click to enlarge

    How to operate the total hydrocarbon analyzer

    Important notice to operate the total hydrocarbon analyzer:

    Before exposing to stale air, its recommended to stabilize VOC monitor readings. Usually in a clean room. The device should stabilize to readings between 3-7 ppm (or at least below 10 ppm). This procedure might take few minutes. Once the unit displays alarm/poor condition (of ambient air), it should turned off. This avoids sensor degradation because of internal corrosion. Hence, improves sensor life and future performance as well

    The following conditions must be strictly avoided:

  • Exposed to volatile silicon steam. The sensor would permanently damage if exposed to silicon steam
  • If the monitor exposes to high concentration of corrosive gases like H2S, SOx, Cl2, HCl. Then sensor’s internal sensor chemical layers corrodes fast. The sensor therefore deviates from actual readings
  • The device should also avoid from Alkali, Alkali metal salt climates. Halogen pollution, or even prolonged exposure to Chlorine or Fluorine damages the sensor
  • The unit should never dip or exposed to water
  • Avoid freezing conditions
  • VOC sensor technical description

    The sensor is inside the left orifice of the device. Sensor composition is micro Aluminum Oxide Al2O3 ceramic tube. In conduction with Tin Oxide SnO (Stannous Oxide) sensitive layer. It has has a measuring electrode and a heater. The heater provides the necessary work conditions for the sensor. A change in the gas concentration, changes the electrical characteristics of SnO. This is hence proportional to change in current flowing through it. The change in current is proportional to the gas concentration. The device meter is NOT a measuring device for individual gas concentration of VOCs. Instead it shows an indicative figure of room air quality (especially odour). It is rather a indicator of TVOC in the air.

    Operating Power supply:

    The VOC monitor operates at 12VDC. operates on 12VDC power supply. We provide 220VDC to 12VDC converter adapter along with the package. User can use a 12V battery EXTERNAL pack as well. The life of the battery would depend on the battery capacity. On an average, 4-6AH/12VDC rechargeable lead acid battery may last for 6-8 hrs.

  • Dimensions of the monitor: 160mm x 100mm x 30mm
  • LCD dimensions: 70mm x 55mm
  • We produce 2 varieties of dust monitors:

  • FBXVQMG: Lemon green display
  • FBXVQMW: Bluish white display
  • Operating voltage 12VDC @ 1Amps

  • Resources

    Product catalog and documents

  • Warranty terms