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If you visited the Company I work for you would see a lot of air/nitrogen/oxygen pressure regulators and bourdon gauges on the wall as well as shelves of air and water rotameters. These are used for setting up pressure switches and flow rates on machines which we sell to customers in the semiconductor process gas treatment field. An external auditor has said that I must get all these gauges and rotameters calibrated. However, some regulators and gauges are only used to apply pneumatic power to a block to operate valves - no measurement or reading is recorded in this instance. You might set the pressure to approx. 4 bar on the wall for instance and that would be good enough. I know you could argue that I don't know if it really is 4 bar if I haven't had the gauge calibrated for 10 years but that's part of an on going argument which I'm embroiled in. I agree that some gauges and rotameters do need calibrating because I record or observe a reading from them. Those which don't you could argue don't need calibration. Another instance is where I need to provide a purge to something through a flowmeter - basically to pass a gas flow through something to get rid of any remnants of a previous gas or to keep things moving in a pipeline to stop condensation of particulates blocking the line. You could argue that no calibration is required here, just a nitogen supply of about the right value. In fact there are FOR INDICATION ONLY stickers you can buy to apply to intruments used in cases like this. I wonder if anyone else has experience of this problem as people often ask me why I am calibrating something.
Thanks
Gerald Curling (Gerald631) Bristol UK
Thanks
Gerald Curling (Gerald631) Bristol UK
