{"product_id":"compound-gauge-2-5-in-300-psi","title":"Compound Gauge, 2.5\" Dial, -30 inHg to 300 PSI, 3\/8\" Tube Stub","description":"\u003cp\u003eA 2.5 inch compound gauge that reads vacuum and pressure on one dial, from -30 inHg through 0 to 300 PSI, with a 3\/8 inch tube stub lower connection. $114.95.\u003c\/p\u003e\n\n\u003cp\u003eThis is the gauge fitted to N.B. Oler columns and vessels, so if you are replacing one, it is the same part, the same dial and the same connection.\u003c\/p\u003e\n\n\u003ch3\u003eCheck the connection before you order\u003c\/h3\u003e\n\n\u003cp\u003eThe connection is a bare 3\/8 inch tube stub and \u003cstrong\u003eno nut and ferrule set is included.\u003c\/strong\u003e The stub goes into your own 3\/8 inch compression fitting and you swage it on.\u003c\/p\u003e\n\n\u003cp\u003eIt is not a pipe thread and it will not screw into a 1\/4 inch NPT gauge port, which is what most extraction gauges use.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDial size\u003c\/td\u003e\n\u003ctd\u003e2.5 in (63 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRange\u003c\/td\u003e\n\u003ctd\u003e-30 inHg \/ 0 \/ 300 PSI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecond scale\u003c\/td\u003e\n\u003ctd\u003e-1 to 21 bar, printed on the same face\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003e3\/8 in tube stub, lower mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e+\/- 1.6 % of full scale, ASME B40.100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase\u003c\/td\u003e\n\u003ctd\u003e304 stainless, crimped ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBourdon tube and socket\u003c\/td\u003e\n\u003ctd\u003e316 stainless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMovement\u003c\/td\u003e\n\u003ctd\u003e316 stainless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens\u003c\/td\u003e\n\u003ctd\u003eAcrylic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase fill\u003c\/td\u003e\n\u003ctd\u003eGlycerin, rated to -40 C (-40 F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating range\u003c\/td\u003e\n\u003ctd\u003e-40 C (-40 F) to 65 C (150 F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWetted materials\u003c\/td\u003e\n\u003ctd\u003e316 stainless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhy glycerin filled\u003c\/h3\u003e\n\n\u003cp\u003eThe fill damps pointer flutter from pump pulsation and compressor cycling, which is what kills a dry gauge on an extraction system.\u003c\/p\u003e\n\n\u003cp\u003eIf you are running the vessel colder than -40 C (-40 F), drain the fill before you take it down. Glycerin stiffens below its rating and the pointer stops tracking.\u003c\/p\u003e\n\n\u003ch3\u003ePicking a range\u003c\/h3\u003e\n\n\u003cp\u003eA dial should read about twice your working pressure, with the working pressure sitting in the middle half of the scale. On a 300 PSI dial that is 75 to 225 PSI, which is where a hydrocarbon system runs.\u003c\/p\u003e\n\n\u003ch3\u003eTwo scales on one face\u003c\/h3\u003e\n\n\u003cp\u003eThe face carries -30 inHg to 300 PSI and -1 to 21 bar, so one gauge reads for a crew working in either unit. It is printed with the N.B. Oler logo in black and gold, which makes it easy to tell from a generic replacement.\u003c\/p\u003e\n\n\u003cp\u003eBuilt to our specification, with our dial, our temperature rating and our range. Stocked in Bend, Oregon.\u003c\/p\u003e","brand":"N.B.Oler","offers":[{"title":"-30in\/Hg to 300psi","offer_id":10700631048249,"sku":"NBO-GAUGE-300","price":114.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2134\/5331\/products\/Untitled_design_24.png?v=1529526744","url":"https:\/\/www.nboler.com\/products\/compound-gauge-2-5-in-300-psi","provider":"N.B.Oler","version":"1.0","type":"link"}