Product Announcement from Environics, Inc.
Calibration of Your Environics System
All Environics systems, with the exception of the Series 7000 Zero Air Generator, are calibrated using a NIST (National Institute of Standards and Technology) recognized and traceable primary flow measurement standard, the Sierra Cal-Bench, Serial Numbers #1010, 1069 or 1089 prior to delivery.
You can request a recalibration here or by calling our Service Department at (860) 872-1111.
During calibration, the commanded output flow of the system is connected to the Sierra Cal-Bench which contains a sonar detection device sensitive to movements no greater than 0.005" (5.0 X 10-4 inches). The Cal-Bench accurately measures the actual flow of the system by sonar detection of the flow-induced movement of a mercury-sealed piston within a glass tube, the diameter of which has been determined using NIST-traceable measuring tools.
During the flow measurement, ambient barometric pressure, ambient humidity, ambient temperature and gas temperature are also measured and considered. In this calculation, the mass flow controller performance is referenced to standard pressure and temperature conditions (760 TORR. 0oC). After testing each of the flow controllers at eleven (11) points over its range plus zero, by comparing command flow with actual flow, the resulting data is stored in the instrument computer in the form of a reference table. The system performs a linear interpolation, between points in the table, and uses all data (tested points plus interpolated values) to select proper voltages in response to flow commands during operation.
The Cal-Bench is re-certified at intervals recommended by its manufacturer using suitable methods and standards including NIST-traceable ring gauges to measure the inner diameters of all tubes. A copy of the most recent certification is available upon request.
All instruments requiring calibration are calibrated as described above. Therefore, these instruments are part of an unbroken chain of NIST traceability and when a system is used with traceable source gases, the combination (traceable instrument, traceable source gas) produces a traceable gas standard that meets or exceeds US Federal Government criteria for accuracy.
To read more about the accuracy of the Environics systems, click here.
Environics is a world leader in computerized gas flow instrumentation. Our headquarters for design, manufacturing, sales and service is located in a modern 11,000 square foot facility in Tolland, Connecticut. We are ISO 9001 certified, having received ISO 9001 Quality Systems Certification in April, 1997.
We are a profitable, privately held company, founded in 1986 and incorporated in the State of Delaware. As of April 2011, we are a Women Owned business, certified through the Woman Owned Small Business Program run by the United States SBA. Our five-year projections show continued growth through the introduction of new products and product innovations. All service is handled factory direct. Sales are handled direct and by selected manufacturers representatives and distributors worldwide.
At Environics, we are dedicated to customer service before, during and after your system is built. We stand by our systems and believe in building long-term relationships with our customers.