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Title: Automated Primary Flow Calibration
Author: Harvey Padden
Source: Flomeko 2007
Year Published: 2007
Abstract: Dissemination of quality calibrations has always been of critical importance. For many types of calibrations, proper application of instruments is the most important factor in maintaining the quality of field calibrations. This is particularly true in the case of gas flow calibration. Shippable primary standards exist, but proper application is still an important issue. Interestingly, we, the makers of precision primary gas flow calibrators, face the same problem as our users. If we include our less expensive primary provers, we have the problem of assuring quality control of thousands of calibrations per year on a production basis. So, to paraphrase the ancients, who will prove the provers? This is a problem that will become more common as other primary and high-accuracy devices are migrated from the lab to field use. While relatively simple for such artifacts as gauge blocks or voltage standards, it is a very complex problem for primary flow provers. How, then, to automate measurement of piston leakage tare, as well as high-accuracy flow comparisons with master devices at a variety of flow rates on an automated basis, assuring maintenance of calibration quality? We have designed a system for our internal use that valves various flows to devices under test while keeping inventory volume to the low, required value, along with the control circuitry to interface all the devices to master DryCal provers. Here we discuss the process, and design considerations in detail.

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