Gaseous Pollutant Monitoring

With the addition of Benzene in petrol, in place of a lead compound, Benzene and its derivatives are now an integral part of vehicular pollution and have become a matter of concern. Unfortunately a majority of these compounds are highly toxic and many have been reported to be carcinogenic. Organic compounds are also reported to be pre-cursers for Ozone formation and play a role in secondary formation of oxidants. As such air pollution monitoring networks are now beginning intensive efforts for monitoring of specific organic compounds such as Benzene, Toluene & Xylene and often a mixture of Total Non Methane Hydrocarbons.

The APM 856 Organic Vapour Sampler meets all important requirements for field measurements of gaseous organic pollutants in ambient air. It collects samples of organic compounds  by adsorbing them on an activated charcoal column. The organics are then desorbed and analyzed via a gas chromatograph to estimate the actual concentration in ambient air.

Special Features:

• Portable, battery operated instrument
• Digital Flow Meter provides accurate flow reading in the 20-200 ml/min flow range
• Built-in Flow Totalizer directly indicates the volume of air sampled in liters
• Programmable Microcontroller based timer allows operation in cyclic manner for collection of composite samples
• Same hardware can be used for monitoring a wide variety of organic compounds
• Rechargeable NiMH battery pack allows operation for at least 8 hours after overnight charging
• Oil-free pump has low noise and requires little maintenance

Additional Information:

• Item Code: OVS856

The APM 433 Gaseous Pollutants Sampler has been designed for monitoring Gaseous Pollutants like SO2, NO2, Cl2, H2S, O3, NH3 etc. in ambient air. The APM 433 is an independent stand-alone monitoring instrument (unlike our gaseous sampling attachments APM 411 and APM 411 TE that need to be paired with a dust sampler). A suction pump is also made an integral part of the sampler, besides a flow-meter, time totalizer and timer. Sampled air is bubbled through suitable reagents that absorb specific gaseous pollutants and the absorbing media analyzed as per standard wet chemical methods.

Special features:

• Cooling based on Peltier Effect to keep the impingers upto 25ºC below ambient temperature
• No ice required to keep impingers cool
• Facility to use impingers with fritted disc for sparsely soluble gases like Nox
• Special Silica-gel filter tubes to remove entrained particulates & moisture
• Improved valve design maintains constant flow rate
• In built suction pump, flow meter, time totalizer and timer for auto start / stop

Additional Information:

• Item Code: APM433

The APM 411TE is designed as an attachment to operate with Envirotech’s Respirable Dust or High Volume Samplers and PM 2.5 samplers. When paired with an appropriate dust sampler, the APM 411 TE allows the user to collect gaseous pollutant samples (for monitoring SO2, NOx, NH3, Ozone, etc) as well as dust samples simultaneously.

Special Features:

• Thermo-Electric Cooling system to keep impingers at a cool 15ºC even when ambient temperature is 40ºC
• Focused cooling for rapid and efficient cooling
• Special Silica-gel filter tubes to remove entrained particulates & moisture
• Improved valve design maintains constant flow rate

Additional Information:

• Item Code: APM411TE

The Respirable Dust Sampler is essentially a particulate sampling system requiring a high flow-rate. Gaseous sampling (for NO2, SO2, CL2, H2S, etc) requires only a few LPM of air flow. All models of Envirotech Respirable Dust Samplers are provided with a suction port and mounting hardware to facilitate interface of the Gaseous Sampling Attachment APM 411.

Special Features:

• Easy manipulation of impingers
• No heating up of absorbing solutions due to heat from the blower
• Provision of using ice or cold water bath around impingers for complete  absorption of sparsely soluble gases
• Facility of taking the impinger tray directly to the laboratory for safer transit of glass parts

Additional Information:

• Item Code: APM411