Gas Meters are categorized depending on the volume (flux) of the meter.
Gas Meters are generally measure in cubic meters per hour. Gases are compressible and change volume when placed under pressure or are heated or cooled. A volume of gas under one set of pressure and temperature conditions is not equivalent to the same gas under different conditions.
When gases or liquids are transferred for their energy content, such as the sale of natural gas, the flow rate may also be expressed in terms of energy flow, such as GJ/hour or BTU/day. The energy flow rate is the volume flow rate multiplied by the energy content per unit volume or mass flow rate multiplied by the energy content per unit mass.
Most flow meters will be used to calculate the volume or mass flow rate which is then adjusted to the energy flow rate by the use of algorithms to turn the raw flow data into volumes at base conditions (consisting of specified absolute pressure and temperature).
Prepaid Gas Meters are typically available with the following features:
Maximum flux (m3/h): Available in: 2.5, 4.0 or 6.00
Working pressure: 0.5 to 10 kPa
Mechanical Counters upto 99999.999
Easily replaceable batteries powered at: 4.5v-6v
Suitable for: Natural Gas, Liquefied Petroleum Gas (LPG)
Not Suitable for: Water Gas or Coke Oven Gas (Synthesis containing carbon monoxide and hydrogen)