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Types of Flowmeters |
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| Gas
meter |
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Gas
meters can be used to measure the flow of fuel
gases such as natural gas propane and methane.
Gas meters are usually used at every residence
and commercial building that consumes fuel gas
supplied by a gas utility company .Three different
designs of gas meters are in common use, depending
on the total volume of gas to be measured. These
include diaphragm meters, rotary meters and turbine
meters. |
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Diaphragm gas meters or positive
displacement gas meters are the most common type
seen in most installations and almost all residential
installations. There are normally two chambers
formed by a movable diaphragm. Valves can direct
the gas flow and the two chambers fill from the
gas source and empty into the gas load, alternating
their roles so that gas delivery to the load is
essentially continuous. As the diaphragms expand
and contract, levers connected to cranks convert
the linear motion of the diaphragms into rotary
motion which then drives the counter.
A Gas turbine meneter uses a turbine contained
within the gas pipe. These meters allow the highest
gas flow, but they have the lowest rangeability.
The positive displacement meters can accurately
measure (at ±1%) gas flows over a very
wide range from their maximum rated flow rate
all the way down to 1/100 of that flow rate or
less, turbine meters are only accurate down to
between 1/12 and 1/33 of their maximum rating
depending on such things as the absolute pressure
of the gas
Additionally, to convert from volume to thermal
energy, the pressure and temperature of the gas
must be taken into consideration.
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Flowmeters Related products |
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References |
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