Measuring natural gas with particulate poses challenges for a lot of flow measurement technology. For example, any meter with a moving part in the flow path can take damage from particles moving through the pipeline.
Differential pressure flow meters are a good option for this application so long as there is a low amount of fluctuation in line pressure and temperature.
RCM Industries manufactures both direct reading and transmitting meters with Differential pressure technology. These meters tend to provide years of service with little or no maintenance required. Since there is no moving parts in the flow path, particulate will flow through without damaging the meters or transmitters.