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Tool Talk Discussion Forum

Calibrating oxy-acet pressure gauges?

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Stickler

07-05-2005 13:12:41




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How are the pressure gauges on oxy-acet regulators calibrated? Only way I've done most gauges is via a deadweight tester, which would fill the gauge with oil, so that's a no-no. I'm thinking that lacking the proper equipment, it's probably going to be cheaper just to replace them. Mine are very old and no longer return right to zero.




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Slowpoke

07-05-2005 21:53:50




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 Re: Calibrating oxy-acet pressure gauges? in reply to Stickler, 07-05-2005 13:12:41  
On low pressure gauges that do not zero, you might as well try to adjust it yourself. There are usually two screws in the back of the gauge. Remove the glass/plastic cover and the screws. The meter body will come out the front. On the back there is a small S shaped connector between the tube and meter shaft. Gently tweak it open or closed, as the case may be, to zero the needle. Holding it with small, smooth jaw pliers while tweaking helps to keep from bending the tube, which can break. Works for me.

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Vern-MI

07-05-2005 14:07:43




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 Re: Calibrating oxy-acet pressure gauges? in reply to Stickler, 07-05-2005 13:12:41  
Druck makes portable pressure testers which use both nitrogen and hand pumped air as a source for pressure. The reference is not dead weight but rather a very accurate and linear pressure transducer mounted inside the calibration unit. The fancier units can even do the scaling automatically and record the observed error to demonstrate gage or transducer hysteresis moving up and down the scale.

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txgrn

07-05-2005 14:02:06




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 Re: Calibrating oxy-acet pressure gauges? in reply to Stickler, 07-05-2005 13:12:41  
Having spent the last 36 years in an industry that spent tons of money and time on calibrating and certifying equipment, I find it interesting that you want to calibrate your gauges; I assume you are using them for personal use.

I never thought of it till you mentioned it. I cut by gut feel and if something isn't right I tweak the regulator and watch the flame, paying no attention to the numbers on the gauge. Really an interesting question.

Mark

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Stickler

07-05-2005 14:53:47




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 Re: Calibrating oxy-acet pressure gauges? in reply to txgrn, 07-05-2005 14:02:06  
I'm a 28 year millwright, so I'm used to calibrating gauges and pressure switches, but only ever done it with a dead weight tester. It's not a big deal to me really, but my acetylene gauge only goes down to 5psig with the gas off, and I'm not the only one who uses my torch. I never thought about it until the other day when I saw my FIL pick up the torch I had just been using, and immediately go for the regulator to turn it down. He's a pipeliner and was trying to give me flak over my acet pressure being too high. Didn't believe me until I backed the regulator off and showed him it stopped at 5psig. I was just curious what they used if not oil.

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T_Bone

07-06-2005 09:15:59




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 Re: Calibrating oxy-acet pressure gauges? in reply to Stickler, 07-05-2005 14:53:47  
Hi Stickler,

My BIL works for NCG gas and I asked him how they do Bourdon tube gauges is to pull the needle and reset the needle position just behind the zero stop pin, install the needle then lift the needle up and over the stop pin. If the needle will rest against the stop pin, your done.

NCG sent him to school to learn this accurate method. How accurate? I can't tell you as I'm just repeating what he told me.

Make a dail hand puller using a piece of 1/8" wire. Flaten one end then cut in a V-notch in the flat then bend to 130� with a long radius with a small kink on the V. This radius will bind on the dial face and the V-notch will slide up under the hand hub then "gently" pry up.

I also have used this puller for antique clocks and pocket watchs with jeweled movements so it works well.

T_Bone

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Stickler

07-08-2005 19:25:40




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 Re: Calibrating oxy-acet pressure gauges? in reply to T_Bone, 07-06-2005 09:15:59  
I have a dial puller already. I've done hundreds of gauges on the dead weight tester. Guess I'll just reset them to zero and not sweat it.



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Slowpoke

07-06-2005 11:27:25




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 Re: Calibrating oxy-acet pressure gauges? in reply to T_Bone, 07-06-2005 09:15:59  
Hey, T-Bone, that method sounds easier than messing with the guts of the gauge. Next time I'll try your method with your 1/8" wire tool. I suppose there is a tool that can be bought at a watchmakers supply. I've never had good luck removing hands with tiny screwdrivers or my fingernails!



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