Ground-based Counterflow Virtual Impactor Inlet System Model 1205

Description

The Brechtel Model 1205 GCVI is the ideal virtual impactor tool for probing the detailed properties of actual cloud condensation nuclei (CCN) inside real clouds. The GCVI was developed for long-term, unattended deployments at mountain and other sites with accessible clouds so researchers could explore aerosol-cloud interactions with the ease of ground operation. Significant anti-icing experience from decade-long aircraft inlet development was applied to the GCVI to ensure the automated wind tunnel lid would open and close reliably under most sampling conditions. With on-line cloud, rain and snow detection, the built-in software will automatically turn your system on when cloud is detected and off when the clouds disappear.

Learn About Product

All Features
The GCVI is the ideal tool for probing the detailed properties of actual cloud condensation nuclei (CCN) inside real clouds. It was developed for long-term, unattended deployment at sites with accessible clouds so researchers could explore aerosol-cloud interactions with the ease of ground operation. With on-line cloud, rain, and snow detection, as well as robust anti-icing systems, the built-in software will automatically turn your system on when cloud is detected and off when the clouds disappear.

 
• Peer-reviewed and characterized CVI Inlet
• Droplet cut size diameters between 7 and 15 microns
• 15 lpm total instrument sample flow
• Fully automated for long-term operation
• Laminar flow element measures sample flow and automatically adjusts to changing instrument flows
• Counter flow rate adjustable between 1 and 10 lpm to vary droplet cut size in real-time
• Automatic power on/off with easy-to-use software
• Wind tunnel lid opens and closes automatically
• Integrated rain/snow sensor
• Tower mountable
• Integrated anti-icing systems
• Removable porous tube tip assembly for easy cleaning

Benefits
  • Fully automated, hands-off operation
  • Wind tunnel tested, field validated and peer-reviewed
  • Designed for long-term, unattended deployment
  • Easy cleaning of tip assembly
  • Weather-proof rugged design
  • Easy to vary droplet cut size in real-time
  • Easy to use control software
Technical Specs

Copyright ©2021 All specifications are subject to change without notice. BMI assumes no responsibility for inaccuracies in this document or for any obligation to update information in this document. BMI reserves the right to change, modify, transfer or otherwise revise this publication without prior notice.

*Some products may be shown with optional accessories, which are sold separately. Items shown may not be to scale.

Applications and Solutions
• Mountain station sampling sites
• Aerosol-cloud interactions
• Cloud condensation nucleus studies
• Cloud microphysics & radiation studies
• Pollution impacts on clouds
• Visibility impacts of fogs
• CCN & precipitation feedbacks
• Global climate model CCN datasets
• Weather modification studies
Software

The GCVI Reader software is installed on the included laptop and allows you to easily operate and configure the system to your needs. You can set the “cloud” visibility and RH thresholds the software uses to automatically turn on the complete GCVI so sampling begins when cloud is detected, even if you’re not there!

The software provides real-time current parameter values, including wind tunnel speed, droplet cut size, wind tunnel anti-ice system temperatures, and system flow rates. You can quickly adjust the droplet cut size and system configuration to suit your sampling needs. Operating pressure and various temperatures are monitored to maintain proper flow and anti-icing system control. Timeline plots of any desired parameter are available.

Further automate your aerosol measurements downstream of the GCVI by adding the optional Inlet Switching chassis (Model GCVI-I) to your GCVI. When cloud is detected, a control signal from the GCVI automatically moves a 3-way valve in the Inlet Switching chassis so instruments sample from the GCVI. When cloud is no longer present, the valve automatically moves to a position allowing instruments to sample from another inlet, for example, for clear-sky sampling.

What's Included

The Model 1205 GCVI inlet comes with the following items:

  • One CVI inlet sampling probe/wind tunnel assembly with anti-icing
  • Weather-proof enclosure with control electronics, dry-air supply, vacuum pump, wind tunnel blower, and sample LFE with 4-way splitter for instrument sample flow connections
  • Integrated rain/snow sensor to shut off wind tunnel automatically
  • Integrated Visibility and RH sensors to detect presence of cloud
  • Pitot Static wind tunnel throat air speed measurement
  • Wind tunnel water trap
  • Interconnect cables and tubing
  • Laptop with GCVI Reader control software
  • Operator’s manual

Note: It is the customer’s responsibility to physically mount the GCVI inlet to their tower or other platform.

Accessories
The following optional accessories are available:

GCVI
GCVI Wind Tunnel installed
GCVI Wind Tunnel removed

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