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Contamination: is this hidden hazard threatening your pressure lab?
A self-purging liquid trap communicates with the pressure controller to purge liquid from the device under test at the appropriate time, without requiring manual intervention. It uses gravity to make any liquid fall out of suspension with the gas as it goes through the trap. A purge valve at the bottom of the trap lets you remove the liquid.
A separator, as its name suggests, separates the fluid in the device under test from the fluid in the calibrator. If you’re using a deadweight tester containing mineral oil to calibrate a device containing a phosphate ester fluid, for example, the separator would keep the two fluids apart during the calibration. This method adds some error or uncertainty to your calibration because of the head height difference and the diaphragm’s location, but that is usually something you can anticipate and compensate for in your calculations. (It’s certainly better than having phosphate ester fluid in your deadweight tester!)
Sometimes it’s the little things that make or break a calibration. One way to be on the safe side is to buy your pressure calibrator and accessories from someone who understands pressure calibration and makes instruments specifically for that application. At Fluke Calibration you will find sales and support representatives who are experts in the field and who can help you to select the best solution for the work you do. Speak with one of our product sales experts.
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