VM-7 Key Features:

• Simultaneously measures particulate and gas concentrations
  • Reduces the need for multiple instruments
  • Also measures VOCs (PID), toxic gas, carbon dioxide, relative humidity, temperature, and air velocity (with Air Probe-10 accessory)
• Dial-in rotary impactor
  • Twist and click selection of PM2.5, PM4, PM10, or TSP* without disassembly and external cyclones
     
• 90-degree light scattering photometer
  • Mass concentration engine provides real-time particulate measurement and display 
     
• Built-in compensating sample pump
  • Simultaneous gravimetric sampling on a 25 or 37-mm filter internal cassette 
     
• Smart auto-recognized toxic gas sensors
  • Carbon dioxide trending algorithms for calculation of room air exchange rates (with QuestSuite Pro II Software, see ordering information) 
     
• Displays Level, Minimum, Maximum, Average, STEL, and TWA in 6 languages
   
• Trend graphing for all parameters
   
• Menu-driven user interface with 10 push buttons/4 softkeys
   
• Time history datalogging
   
• Specialized models available for IAQ analysis and particulate monitoring (within the instrument’s measurement range)

Monitor multiple air quality hazards/parameters using one instrument with the Quest® EVM-7 environmental monitor. EVM-7 simultaneously measures particulates, volatile organic compounds (VOCs) with PID, toxic gas, carbon dioxide, relative humidity, temperature, and air velocity (with accessory probe). Two instruments in one means lower cost of ownership and elimination of multiple instruments.

Additional EVM-7 Features:

• Factory calibrated relative to ISO 12103-1, A2 (Arizona Road Dust)
• Site correction factors for particulates (user supplied)
• Auto run and security code protection for unattended monitoring
• Real-time measurement with once-per-second update rate
• User selectable digital output for external functions

Easy access to gravimetric  sample filter cassette	Removable sensor bar for  easy access to sensors

EVM-7 Applications

• Worksite monitoring
• Industrial hygiene surveys
• Military site evaluation
• Aircraft and train environment sampling
• Construction/mining site monitoring
• Engineering studies
• Industrial fenceline monitoring
• Remediation sampling
• IAQ walk-through and stationary studies
• Air quality assessment
• VOC screening and monitoring
• Regulatory compliance

Specialized EVM Models 
EVM-4 and EVM-3 feature the durability, quality, and overall design of the EVM-7, but provide a sensor configuration for specific applications.

• EVM-4 for Comprehensive IAQ Analysis Monitors and logs CO, RH, temperature, and CO2 (with QuestSuite Pro II Software). Optional sensor accessories are available for air velocity, VOCs, particulates, and an alternate toxic gas.
• EVM-3 Real-time Direct-reading Particulate Monitor Measures and logs particulate mass concentration (PM2.5, PM4, PM10, or TSP*), temperature, and RH. Optional sensor accessories are available for air velocity, CO2, VOCs, and CO or other toxic gas

• articulate and Air Quality Monitoring in One Instrument

  Oconomowoc, WI - Quest Technologies, a 3M company, is pleased to introduce the EVM-7, a rugged and easy to use environmental monitor which combines several instruments into one. With the capability to simultaneously measure and log particulates (mass concentration), volatile organic compounds (VOCs), toxic gas, carbon dioxide (CO2), relative humidity, temperature and air velocity (with optional accessory), the EVM-7 provides a cost-effective solution and reduces the need for multiple instruments.

  Real-Time Direct Reading Particulate Monitor
  The EVM-7's unique, patent-pending dial-in impactor allows for quick selection of particulate settings PM2.5, PM4, PM10 or TSP*, without disassembly. A built-in sampling pump assists in the collection of particulates while the light scattering photometer mass concentration engine provides real-time measurement. A standard 37 mm filter cassette is utilized for gravimetric sampling and laboratory analysis.

  Comprehensive Measurement with PID and Smart Sensors
  Using a high-performance Photoionization Detector (PID) the EVM-7 measures volatile organic compounds (VOCs). Combined with the ability to also simultaneously measure carbon dioxide (CO2) and one toxic gas, the EVM-7 can help identify air quality issues. Additionally, the EVM-7 uses smart sensor technology, which offers automatic sensor recognition at power-on, calibration levels, service dates, temperature compensation and other sensor specific data. Sampling sessions and studies stored in the internal memory can later be downloaded into QuestSuite®Professional II for analysis, charting and graphing.

  About Quest Technologies
  Quest Technologies, a 3M company is a world class manufacturer and leader in the field of occupational safety, industrial hygiene and environmental instrumentation. Quest products are used in more than 80 countries worldwide. Quest has a reputation for rugged, reliable instrumentation and software systems that monitor and evaluate occupational and environmental health and safety hazards including noise, vibration, heat stress, indoor air quality and toxic/combustible gases. Quest monitoring instruments serve a variety of occupations and industries with clients in mining, research, enforcement, military, education, insurance and manufacturing business sectors.

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  What is Sheath Air and how does it work?
  Sheath air is clean filtered air that surrounds the aerosol stream to prevent particulates from circulating or depositing within the optic chamber. Sheath air prevents contamination caused by build-up and deposits, improves response time by containing the sample, and improves maintenance by keeping the optic chamber clean.

  From where does Sheath Air come?
  The Nephelometer creates the sheath air by passing air through a zero filter before beginning the sample.

   

  What is a Nephelometer?

  The Nephelometer is an analytical instrument used to measure the light-scattering coefficient of atmospheric and indoor aerosols. Depending on design, a Nephelometer inherently has different levels of sensitivity. The main uses of Nephelometers relate to air quality measurement for pollution monitoring, climate monitoring, and visibility.

  Types of Dust

  • Heavy Dust
    • The layer of dust on furniture and floors.
  • Settling Dust
    • Particulate’s in the air floating around before it turns into heavy dust.
  • Suspended Atmospheric Dust
    • Minute particles slowly settling or suspended by slight currents and existing in varying amounts in all air.

  Airborne Particulate

  

  Airborne particles are commonly either biological contaminants, particulate contaminants, gaseous contaminants, or dust. 

  This chart shows the types and sizes of various particulate contaminants.   This information is helpful toward understanding the character of particulate pollution inside a building or in the ambient air.   It is also useful for understanding the cleanliness level in a controlled environment.  

  Biological contaminants include mold, fungus, bacteria, viruses, animal dander, dust mites, pollen, human skin cells, cockroach parts, or anything alive or living at one time.  These are the biggest enemy of Indoor Air Quality specialist because they are contaminants that cause health problems.  Levels of biological contamination depend on humidity and temperature that supports the livelihood of micro-organisms.  The presence of pets, plants, rodents, and insects will raise the level of biological contamination. 

  The Human Airway/Respriatory System

   

  Inhalable particulate – Particles with an aerodynamic size cut point of 100 microns that deposit in the nose, mouth, pharynx, and larynx.

  Thoracic particulate – Particles with an aerodynamic size cut point of 10 microns and deposit in the trachea and bronchus.

  Respirable particulate – Particles with an aerodynamic size cut point of 4 microns and deposit in the lower portion of the lung sacks or bronchioles.