Total Hydrocarbon monitor

FORBIX SEMICON total hydrocarbon monitor checks for the presence of hydrocarbon compounds in the air.  It gives a collection concentration reading of VOC gases (usually in vapor form).  This total hydrocarbon monitor gives an averaged value of total VOC count (TVOC) of the compounds like Benzene, Xylene, Toluene, Smoke, Alcohol, Hydrocarbons, LPG, Formaldehyde, PVC solvents, Petrol, CNG, Diesel, IPA solutions, gluing/bonding agents, etc

Following is the relative sensitivity of the vapors:

  • 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

The 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 [POOR]
  • Above 30 ppm as [ALARM]
VOC total hydrocarbon monitor
Total hydrocarbon monitor

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 is 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 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 are displayed.

Important notice to operate the total hydrocarbon monitor:

  1. Before exposing the total hydrocarbon monitor to stale air, it is recommended to turn ON the total hydrocarbon monitor in a clean room to allow the readings to settle to 0 ppm (or at least below 10 ppm).  This procedure might take a few minutes to a few hours, depending on how long the monitor was un-operational before that
  2. Once the unit displays alarm/poor condition (of ambient air), it is recommended to remove the monitor from such an environment.  The unit should be turned off and kept isolated from such environment to avoid sensor degradation because of corrosion.  It 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 is exposed to a high concentration of corrosive gases viz. H2S, SOx, Cl2, HCl, etc. internal sensor chemical layers will get corroded and the sensor will never be able to recover from this situation
  • The monitor should be avoided from Alkali, Alkali metal salt, halogen pollution, or even exposed to Chlorine or Fluorine
  • The unit should never be dipped or exposed to water directly
  • Avoid freezing conditions

Sensor technical description:

The sensor is located inside the left orifice of the monitor.  It is composed of micro Aluminum Oxide Al2O3 ceramic tube containing Tin Oxide SnO (Stannous Oxide) sensitive layer, measuring electrode and a heater. The heater provides the necessary work conditions.  A change in the gas concentration changes the electrical characteristics of SnO (proportional to a change in the current flowing through it).  The change in current is measured for displaying the gas concentration.  The VQM monitor is NOT a measuring device for individual gas concentration; instead, it shows an indicative figure of room air quality (especially odor)

Operating Power supply:

The VOC monitor operates at 12VDC.  operates on the 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 average, the 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:

FBXTHMG: Lemon green display

FBXTHMW: Bluish white display

Operating voltage 12VDC @ 1Amps