--- title: Calibration Gas Flow Selector description: The GFS Gas Flow Selector has been designed to provide a solution for manually calibrating instruments with multiple sensors. --- EMAIL US [cac@cacgas.com.sg](mailto:cac@cacgas.com.sg) [![CAC Gas Asia Logo](https://www.cacgas.com.sg/hs-fs/hubfs/CAC%20Gas%20Asia%20Logo.jpg?width=5084&height=2759&name=CAC%20Gas%20Asia%20Logo.jpg "CAC Gas Asia Logo")](https://www.cacgas.com.sg?hsLang=en) # **GFS: Gas Flow Selector ** ![GFS](https://www.cacgas.com.sg/hs-fs/hubfs/GFS.jpg?width=300&height=300&name=GFS.jpg)   The GFS has been designed to provide a solution for manually calibrating instruments with multiple sensors. A simple turn of the dial allows calibration gas to be selected and delivered to a single instrument. Housed in a 15cm x 15cm x 11cm powder coated steel enclosure, and all wetted materials are fully inert & corrosion resistant for use with reactive & corrosive gases. Different versions are available for 2-6 gas inputs for either pumped or diffusion instruments using either non-refillable cylinders or large volume high pressure cylinders. The switch on the front rotates to different positions. Each of the location indicates which gas/channel is selected. There are positions for calibration gases, zeroing and an off position (diffusion versions). - GFS-201 Two Gas inputs for pumped instruments - Select calibration gas with adjustment dial - Compatible with corrosive and non-corrosive gases - Used with pumped or diffusion instruments - Multiple calibration gases to one instrument ### Specifications: - GFS-401 Four gas inputs for pumped instruments - GFS-601 Six gas inputs for pumped instruments - GFS-301-D Three gas inputs for diffusion instruments - GFS-501-D Five gas inputs for diffusion instruments ### Ask us about this product. ### Contact Details Phone: +65 6977 7370 Email: [cac@cacgas.com.sg](mailto:cac@cacgas.com.sg) CAC GAS Asia 20 Woodlands Link, #06-13 Singapore, 738733 ### Tools [![Gas Finder](https://no-cache.hubspot.com/cta/default/6498667/ab5f62f0-0a01-4cad-9bc0-1699fd607183.png)](https://cta-redirect.hubspot.com/cta/redirect/6498667/ab5f62f0-0a01-4cad-9bc0-1699fd607183) [![Gas Calculator](https://no-cache.hubspot.com/cta/default/6498667/b57879eb-dcc4-4b6e-a4ad-7c83741828da.png)](https://cta-redirect.hubspot.com/cta/redirect/6498667/b57879eb-dcc4-4b6e-a4ad-7c83741828da) ### Recent Blog Posts ### Follow CAC Gas on: - [![](https://www.cacgas.com.sg/hubfs/cac%20assets/icon_youtube%20(1).png)](https://www.youtube.com/user/CACGas1?feature=watch) - [![](https://www.cacgas.com.sg/hubfs/cac%20assets/icon_linkedin.png)](https://www.linkedin.com/company/cac-gas-%26-instrumentation) - [![](https://www.cacgas.com.sg/hubfs/cac%20assets/icon_twitter.png)](https://twitter.com/CACGAS) - [![](https://www.cacgas.com.sg/hubfs/cac%20assets/icon_facebook.png)](https://www.facebook.com/CACGas/)