3-A: 3-A Sanitary Standards Inc., A non-profit association representing equipment manufacturers, processors, regulatory sanitarians, and other public health professionals that creates standards and accepted practices for dairy and food processing equipment and systems
The total force per unit area exerted by a fluid. The sum of atmospheric and gage pressures.
The time required to get from zero to the maximum frequency is the acceleration time. The time required to get from the maximum frequency to zero is the deceleration time.
Accuracy: The degree to which an observed value matches the actual value of measurement over a specified range.
In electrical engineering, the term actuator refers to a mechanism that causes a device to be turned on or off, adjusted, or moved, usually in response to an electrical signal. In some literature, the terms actor or effector are also used. The term “effector” is preferred by programmers, whereas engineers tend to favor “actuator.” An example of an actuator is a motor that closes blinds in response to a signal from a sunlight detector. Actuators enable computers to control complex manufacturing processes without human intervention or supervision.
In general terms, advanced process control refers to large-scale computer systems that are used to monitor and control processing plants such as oil refineries or cement factories. The systems extend traditional process control, which is used to monitor and control individual processes, by evaluating and controlling multiple processes across the plant. By monitoring multiple processes, APC systems can optimize operations for multiple parameters, evaluating the impact each adjustment will have on neighboring operations by referencing current and historical data. With a broad yet detailed view of an entire plant’s operations, APC applications allow processes to operate closer to their maximum capacity, while maintaining the necessary standards of reliability and safety.
A set of (mathematical) instructions or procedures for carrying out a specific task such as defining the steps taken by an automation system.
Alternating Current (AC): Current that reverses polarity at a uniform frequency
Indicating a frequency with an analog signal of -0 to 5 V, 0 to 10 V, 4 to 20 mA, etc.
A signal that expresses continuous quantities through the size of the signal.
ANSI: The American National Standards Institute is a private nonprofit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States.
The electrical and mechanical conditions under which the customer uses the device, including the current, voltage, load type, operating frequency, and operating speed.
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