Measuring controlling, and regulating instruments, systems, and apparatus-namely recorders, indicators, integrators, regulators and controllers of combustion, of process and of fluid flow and conditions pertinent to fluids such as rate of flow, level, temperature, and pressure; remote recording, indicating, integrating, controlling and telemetering instruments; adjustable orifices and other apparatus appurtenant to such instruments; air tracer contour control and duplicating attachments; gas analyzers, instrument and control panel boards, time cycle instruments and controllers, weighing scales, and electric and fluid pressure selector switches; process control instrumentation - namely operator interface units - namely digital controllers, configuration and tuning modules, operator consoles; process control units - namely controller modules, logic master modules, digital slave modules, analog slave modules, analog master modules, analog output modules, controller interface modules; termination units for computer interface and process input and output wiring; and power modules for both modulating and sequential control, data acquisition, operator interface, and computer interface for industrial and utility applications; stand alone controllers, communications interfaces, smart transmitters or monitors and configuration engineering modules; liquid analysis equipment, namely - pH, conductivity, specific ion, and oxidation reduction potential; and flame scanners