9 temperature indicating and/or transmitting products, namely temperature sensors, temperature indicators and transmitters therefor, pressure indicating and/or transmitting products, namely pressure sensors, pressure indicators and transmitters therefor, gas or liquid flow meters, indicating and/or transmitting products, namely indicators and transmitters therefor, vibration indicating and/or transmitting products, namely vibration meters and transmitters therefor, process and area detectors/analyzers for measuring constituents of gas and liquid mixtures , residual gas analyzers therefor, control valves for regulating the flow of gases and liquids, filters for filtering gases and liquids flame scanners for detecting the presence of flame, and controls systems comprising computer operating programs and computer hardware