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