Barometer that works..

R

Rohorn

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3 Oct 2003
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199
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Paros, Greece
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Hi...is there a reliable. modern, sensitive and inexpensive device that will give an accurate easy-to-read value for ambient atmospheric pressure?
Not the dusty retirement type which 'angs on the 'ook in the 'all which you tap, (or hammer), when passing, to relieve the hysterisis.
The little plastic gizmos with their LED bar charts nicely show the trend, but don't (I think) give an accurate absolute value.
What do you use?
Cheers....R


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I have a brass aneroid barometer made by FIC (available from Pumpkin at Northeney) which seems to be well made and reasonably accurate. Not as accurate as my one in the hall which is a true 30" of mercury/forums/images/icons/smile.gif

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Yes they do give an accurate value.
A recent magazine did a test of several electronic ones - I bought their "best buy" and am delighted with it.
Can't tell you more as all the information is on the boat and I am at home - cost me about £60.
Ken

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We just have a standard chanderly one that has always worked ok with out tapping. I adjusted it a few years back to match the pressure given by an electronic and mercury one and it stills seems ok. More important than being accurate is that it monitors the change in pressure reliably.

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Hi Peter,

Me too. Mine is a standard Marpro brass barometer and was adjusted by me actually at the waters edge, to the pressure prevailing given to me by RAF Mountbatten here in Plymouth some years ago. I've never adjusted it since and certainly don't tap it.

Ok, it will probably differ by a few millibars from the next yacht's, but that isn't important to me. What I want to know is whether it's rising or falling - by how much and how fast!!

Whether we're basically a bit higher or lower than reality, doesn't matter to us.

Cheers

Jerry

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What is the need for an absolute value?

My boat has the old fashioned bulkhead mounted chandlers type. It is fine for trends, but now you've got me worried.

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Hi...There are a few reasons why I want an absolute value.
1) Curiosity.
2) Sure the trend is perhaps the most important but if one has an idea in one's head about the major highs and lows around , say from the navtex, given the absolute value one can get a feel for the local evolution relative to to those major systems. Hence, given from the navtex "High pressure 1017 mb north balkans and low 1003 Cyprus", all moving slowly eastward, and I've got an absolute value somewhere in between, here off Paros, I can judge a bit better how far things have evolved, and how much longer I've got to stay holed up. That, with the trend from my cheapy black gizmo, would be nice to have.
3) I and even more SWMBO are sensitive to pressure changes...it's our sweet sensitive natures. The absolute value would give me an idea how gritchy I could afford to be.
4) Nice to drop in the definitive pressure during those nebulous discussions about the weather over G and T.
Other folk may have other suggestions.
Cheers....R

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Im delighted with my DALVEY travel barometer. Very acurate and can be taken anywhere.
Costs about £70, well worth the money.


Don

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<font size=1>Nice to drop in the definitive pressure during those nebulous discussions about the weather over G and T.</font size=1>

You don't want it to be TOO accurate then, 'cause the CO2 escaping from the G&T's will tend to lower the (very) local air pressure making your authorititive statement of local pressure, erm wrong...../forums/images/icons/wink.gif/forums/images/icons/wink.gif

<hr width=100% size=1>There are 10 kinds of people, those who understand binary and those who don't.
 
I have swapped to a unit marketed by the Science Museum.
It has Pressure, a bar trend 6 bars over 12 hours, an arrow showing up down or neutral, a little display that predicts cloud rain or shine
outside temperature, time & date, an alarm, unit powered by a couple of AA batteries, about 7 inches high by 4 inches wide
To date been trouble free, I have it velcroed to the chart area bulkhead.
....and cost 15 quid from Dixons on special, but is listed at £29.99

Recommended by me anyway, and very differently priced to the Oregon Scientific stuff (which IS excellent by the way)


Jim & Lynn

<hr width=100% size=1>Second Chance - First Love. Look for the Yellow Dinghy in Burnham.
 
Have both a 'traditional' Plastimo baromemter and clock thing in brass and mounted on a fashionable bit of wood. Good for trends. Place my bets though on an Oregon barometer which not only tells me the tren d over the last 24 hours gives me the pressure at whatever altitude I require - funnily enough at the moment set to sea level - though in the winter set to 20 metres - height of house above sea level. Very accurate. A wee man even tells me when its pissing down!

Regards

Donald

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Not cheap but

very good and accurate - why not get a proper marine barograph. Enjoy changing the paper each week and keeping a long term record of the weather.

Very important to get a balanced marine version however, other wise any old goffer will spoil the trace and make it very inaccurate.

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The review was in 'Sailing Today' August 2004. Their best buy was a Vion for £54.95. Very accurate. I bought one and am very happy with it, gives a 24 hourly trend graph.

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But its the trend that is more important than the actual pressure at that time..... in most cases.

There are actually a few LCD ones that do show pressure as well as the option to trend.

All Barographs have correction sheets - so none is 100% accurate, its just that they are better made and calibrated so you can correct to true pressure at that time.


<hr width=100% size=1>Nigel ... and of course Yahoo groups :
http://groups.yahoo.com/group/gps-navigator/
 
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