Portable electrical apparatus for the measurement of combustion flue gas parameters. Guide to their use in the process of commissioning, servicing and maintaining gas fired appliances1 Scope This Technical Specification provides guidance on the selection, use and maintenance of portable electrical apparatus conforming to EN 503791[4] and EN 503792[5] or EN 503793[6] to: a) measure combustion flue gas parameters of appliances in domestic premises burning 1st, 2nd or 3rd family gases of the following description: 1) Type A, Type B and Type C gas fired appliances, except those appliances where the appliance instructions (or design,

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without the need to first convert it to an electrical signal

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– engineering of roles

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the stability of metrology characteristics

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