Gas meter architecture

A method comprising:

• generating, at a metrology unit of a gas meter, flow rate data of a gas flow based on readings from a flow rate sensor of the metrology unit;
• generating, at the metrology unit, an average flow rate value of the gas flow based on the flow rate data;
• outputting, via an output port of the metrology unit, the average flow rate value to an index unit of the gas meter, wherein the index unit is releasably coupled to the metrology unit;
• converting, via the index unit, at least some of the flow rate data received from the metrology unit to gas volume data;
• communicating, via the index unit, at least some of the gas volume data over a network;
• and
• wherein the metrology unit of the gas meter is not configured to convert the flow rate data into gas volume data.

A system comprising:

• a first unit comprising:
• a flow tube configured to receive flow from a flow line;
• a sensing device in communication with the flow in the flow tube;
• a controller in communication with the sensing device;
• a second unit releasably and communicatively coupled to the first unit, the second unit is configured to communicate with a remote unit;
• wherein the first unit is configured to:
• determine one or more values related to flow rate of the flow through the flow tube based on an output of the sensing device;
• and
• provide a value of the one or more values related to flow rate to the second unit upon request;
• and
• wherein the first unit is not configured to convert the flow rate data into gas volume data and provide the gas volume data to the second unit upon request.