LETTERS

摘要

The article 'Wireless watch' about Sentec's Lattice solid state gas metering technology (Design Engineering, 10 March) was very interesting, but begged some questions.Natural gas sourcing is now more variable and includes UK, two separate intercpnnector systems and LNG imports. Physical properties, such as Wobbe number and density will therefore vary according to limits allowed by the GS(M)R (Gas Safety Management Regulations) to reduce costly refining.