# Thread: Gas Meter - 1/2 cu and 2 cu ft scale - reads by division or full circle?

1. Regular Guest
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Dec 2004
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Hi everyone. I'm a retired scientist with an interest in
energy and am trying to read my natual gas meter's
'test dials'.

here's my request
--
Hi,
My gas meter has two 'test dials' that are labeled
1/2 cu ft and 2 cu ft. They each have 10 divisions on them.
What I would like to know is whether each division represents
1/2 or 2 cu ft. Or if an entire rotation is equal to 1/2 or 2
cu ft. The reason I ask is because I want to run my gas wall
furnace for one hour straight and see what the usage is.
But the other dials are too coarse and won't move enough with
just one hour of the wall furnace.

Can you help me? Thank you.
If you are not sure or what to check yourself perhaps you could
pass this email to an engineer or technician for a check.
Here is a photo of a gas meter similar to mine showing the two
test dials of 1/2 and 2 cu ft.
http://www.uniongas.com/images/imperial8.jpg

2. Regular Guest
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The gas volume posted below each dial is the gas consumed by a full revolution of that dial.

So a revolution of the 1/2 foot dial indicates 1/2 cubic foot of gas used.

One revolution of the 2 cubic foot dial indicates 2 cubic feet consumed.

An AVERAGE figure is that one cubic foot of gas contains 1,000 BTUs of heat energy. If you look at the rating plate on your equipment it may give a BTU input of 80,000 BTUs, which would indicate about 80 cubic feet of gas used per hour.

Often times gas bills are figured in therms, which converts the cubic feet of gas used to BTUs, with each therm being 100,000 BTUs of heat.

To measure the actual gas consumption of an appliance, turn all other appliances off or so the main burners wont turn on.

Turn on the main burner of the appliance whose gas consumption you want to measure. Measure the seconds it takes for the 2 foot dial to make a full revolution.

Divide the number of seconds into 7200 to get the number of cubic feet used per hour. (If the two foot dial turns 360 degrees in 72 seconds, the appliance uses 7200/72 or 100 cubic feet of gas per hour).

Seattle Pioneer

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## Great Reply - Super to discuss things

Isn't this SUPER to have forums like this? Our knowledge
is growing exponentially isn't it?

Regarding this heater. The interesting thing that struck me
is that it will have a BTU rating on it. Perhaps it is about 60,000
BTU's (per hour?) and so that's easy to figure what it uses.

But I'm cheating. There is a gas valve right at the heater. And
because it is very agressive in a relatively small room I turned
down the gas flow so that when it comes on the burner is
running rather low. I'd guess about 1/5 or 20% of maximum.

So because of that I am even more interested to measure the
actual usage of it. AND if I can compare the usage to
the temperature outside here is what I will do next.

I will make some changes to the large amount of window area
in the room. And then take some more measurements.
It's all a bit emperical so be it. But in the final analysis
it's fun, educational, and useful information.

Thank you for the tip about the 7200. I will be glad to
do that.

I ran the heater for one hour a few days ago.
The temperature in the room went up to about 90° F
and I used 1.75 cu ft of gas ( I think). That would be
equal to about 2000 BTU's and that does not equate
to a room temperature after an hour of 90F. So
there's a mistake somewhere.

This is where it gets fun. Finding out where the mistake is.

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