--- title: Viscosity Management in Group B, C and D Hazardous Locations description: Cambridge Viscometers can now be used in Gas Group B hazardous locations, in addition to group C and D. image: https://www.cambridgeviscosity.com/hubfs/Cambridge_Viscosity_Oct_2016/Images/prodsm_spl392.jpg --- [![CVI-by-PAC-RGB](https://www.cambridgeviscosity.com/hs-fs/hubfs/CVI-by-PAC-RGB.png?width=1320&height=291&name=CVI-by-PAC-RGB.png "CVI-by-PAC-RGB")](https://www.cambridgeviscosity.com) This is a search field with an auto-suggest feature attached. - There are no suggestions because the search field is empty. # Cambridge Viscosity Blog ## [Viscosity Management in Group B, C and D Hazardous Locations](https://www.cambridgeviscosity.com/blog/bid/68352/viscosity-management-in-group-b-c-and-d-hazardous-locations) ** Jul 20, 2017 8:21:00 AM / by [Admin](https://www.cambridgeviscosity.com/blog/author/admin) - [Tweet](https://twitter.com/share) ![viscosity management](https://www.cambridgeviscosity.com/hubfs/Cambridge_Viscosity_Oct_2016/Images/prodsm_spl392.jpg)Boston—Cambridge viscometers can now be used in Gas Group B hazardous locations in addition to Group C and D hazardous environments. This extension of approvals to Class 1, Division 1, Groups B, C, and D applies to the entire family of in-line 300-series sensors made by Cambridge Viscosity. These are the primary sensors used in refining, exploration, petrochemical and chemical processes, including both standard and high temperature sensors. The new Gas Group B classification enables these sensors to be used in hazardous locations, which include hydrogen, fuel and combustible process gases containing more than 30% hydrogen by volume or gases of equivalent hazard. Groups C and D include environments that may contain carbon monoxide, ether and hydrogen sulfide, or for Group D, gasoline, acetone, ammonia, benzene, butane, natural gas, propane and other gases of equivalent hazard. “We are pleased that our 300 sensors have been approved for Gas Group B use. Our sensors have been Group C and D classified for years, but being approved for the more stringent hydrogen environments allows us to provide viscosity management solutions to a whole new segment of customers,” says Cambridge Director of Engineering Daniel Airey. Cambridge 300 sensors are used in a wide variety of industries for in-line and in-tank applications.  Cambridge’s viscometers are well suited to the rigors of harsh environments due to their robust, durable design and construction. [![Configure Your Viscometer](https://no-cache.hubspot.com/cta/default/2542477/1351ccdf-fe7c-4d95-b11d-84b68bd358b9.png)](https://cta-redirect.hubspot.com/cta/redirect/2542477/1351ccdf-fe7c-4d95-b11d-84b68bd358b9) **About Cambridge Viscosity** Cambridge Viscosity is the leading supplier of automated viscometers used by oil exploration and refining, coating, chemical and life science companies to optimize product and process performance. Cambridge Viscosity's sensors and viscometer systems conform to ASTM, DIN, JIS and ISO standards, with a range of models designed to meet specific industry and application needs. Certifications include ATEX, CE, and FM. CSA certification is available upon request. Cambridge's global reach provides application engineering support and service wherever and whenever needed. To learn more visit www.cambridgeviscosity.com.   Tags: [392 sensor](https://www.cambridgeviscosity.com/blog/topic/392-sensor), [oil analysis](https://www.cambridgeviscosity.com/blog/topic/oil-analysis), [374 sensor](https://www.cambridgeviscosity.com/blog/topic/374-sensor), [372 sensor](https://www.cambridgeviscosity.com/blog/topic/372-sensor) #### Written by [Admin](https://www.cambridgeviscosity.com/blog/author/admin) ### Subscribe to Email Updates - [Recent](https://www.cambridgeviscosity.com/blog/bid/68352/viscosity-management-in-group-b-c-and-d-hazardous-locations#tab-1) - [Popular](https://www.cambridgeviscosity.com/blog/bid/68352/viscosity-management-in-group-b-c-and-d-hazardous-locations#tab-2) - [Categories](https://www.cambridgeviscosity.com/blog/bid/68352/viscosity-management-in-group-b-c-and-d-hazardous-locations#tab-3) [Viscometer Measurement: A Glimpse into Reservoir Fluid Dynamics](https://www.cambridgeviscosity.com/blog/viscometer-measurement-a-glimpse-into-reservoir-fluid-dynamics) posted at Sep 26, 2023 ![Viscosity Measurement: A glimpse into reservoir fluid dynamics](https://www.cambridgeviscosity.com/hs-fs/hubfs/2023-09-21-a-glimpse-into-reservior-fluid-dynamics-sm.jpg?length=80&name=2023-09-21-a-glimpse-into-reservior-fluid-dynamics-sm.jpg) [Part 3 - 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