paulmars Posted March 2, 2018 Share Posted March 2, 2018 I need to test this gauge. It reads -0.25 to 0 to +0.25 in water. Im using it in the 0.02 to 0.03 negative and positive ranges. What of known value can I use to deflect this gauge maybe .1 or .05 in either or both directions to test the gauges accuracy? pa Link to comment Share on other sites More sharing options...
paulmars Posted March 8, 2018 Author Share Posted March 8, 2018 mount it inclined 10:1 for 10 times the resolution. https://www.amazon.com/Yellow-Jacket-78075-Water-Manometer/dp/B0038QHTK2/ref=sr_1_5?ie=UTF8&qid=1520466840&sr=8-5&keywords=manometer its graduated at 0.25 intervals and you can easily judge 1/5 of that. So, 0.25 included 10:1 the 0.25 would then be 0.025 and I could fairly accurately judge 1/5 of that or 0.005. thoughts? Link to comment Share on other sites More sharing options...
John Cuthber Posted March 8, 2018 Share Posted March 8, 2018 Something like this https://www.coleparmer.com/i/dwyer-mark-ii-25-inclined-manometer-3-wc/6806258 though you may wish to make, rather than buy, one. Link to comment Share on other sites More sharing options...
paulmars Posted March 8, 2018 Author Share Posted March 8, 2018 3 hours ago, John Cuthber said: Something like this https://www.coleparmer.com/i/dwyer-mark-ii-25-inclined-manometer-3-wc/6806258 stated accuracy of that dwyer is +/-0.09 which makes it less then useless. Link to comment Share on other sites More sharing options...
John Cuthber Posted March 8, 2018 Share Posted March 8, 2018 3 hours ago, John Cuthber said: though you may wish to make, rather than buy, one. Link to comment Share on other sites More sharing options...
paulmars Posted March 8, 2018 Author Share Posted March 8, 2018 then how would i test its accuracy? Link to comment Share on other sites More sharing options...
John Cuthber Posted March 8, 2018 Share Posted March 8, 2018 Make 2 or 3 and see how well they agree. Link to comment Share on other sites More sharing options...
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