instrumentation systems to be used for the control, measurement, disinfecting and treatment of various liquids, gases and solids found in potable water, wastewater, boiler feed water, petrochemical fluids, steam, mining slurries, acids, agricultural products, pharmaceutical, and food process products consisting of chemical injection equipment, namely, flow meters for measuring the flow of gases, liquids, and solids; and electric, hydraulic, and pneumatic valve actuators, and electronic control equipment, namely, computers, differential pressure and temperature transmitters, and electronic scales; and integrating primary flow devices for measuring the flow of gases, liquids and solids, namely, AC and DC pulsed magnetic flow meters, turbine flow meters, propellers flow meters, differential pressure flow meters, transient time flow meters, ultrasonic flow meters, positive displacement flow meters, helical romometer flow meters, and variable area rotometers; and remote telemetry communications equipment, namely, radio transmitters and receivers, programmable logic controllers in the nature of flow and level controllers and controllers of the chemical injection of gases, liquids and solids, remote telemetry computers, transducers which are meters which test the level and flow of gases, liquids and solids, and telephone auto dialers; process pH meters; apparatus for adding chemicals to water in measured amounts, namely, chemical feed pumps; testing apparatus and analyzers for measuring chlorine in water, namely, chlorine residual analyzers; chemical feed pump motor controllers; electronic multiple loop controllers for data logging and measurement control; temperature sensors, pressure sensors, analytical microprocessors for control and monitoring of pH, residual, turbidity, temperature, and pressure