instrumentation systems comprising chemical injection equipment, flow metering devices, electric, hydraulic, and pneumatic valve actuators, and electronic control equipment, namely computers, differential pressure and temperature transmitters, and electronic scales 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; and integrating primary flow devices, 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 rotometer flow meters, and variable area rotometers; and remote telemetry communications equipment, namely radio transmitters and receivers, programmable logic controllers, remote telemetry computers, transducers, and telephone autodialers; process pH meters; apparatus for adding chemicals to water in measured amounts; testing apparatus and analyzers for measuring chlorine in water; chemical feed pump motor controllers; multiple loop controllers; temperature sensors, pressure sensors, analytical microprocessors for control and monitoring of pH, residual, turbidity, temperature, and pressure