Instrumentation Intro 1, Lesson 9 & 10

  ?   is conformity to an indicated, standard, or true value, usually expressed as a percentage deviation (of span, reading, or upper-range value) from the indicated, standard, or true value, or the degree to which an indicated value matches the actual value of a measured variable. A mathematical relationship expresses the degree of conformity.

• Deviation

• Accuracy

• Set Point

• Zero

 ?   is the set of values over which measurements can be made by a device without changing the device's sensitivity.

• Calibration

• Deviation

• Range

• Span

The   ?   is the variable for which supply and demand must be balanced. It is a physical or chemical change of matter and/or conversion of energy.

• span

• process variable

• set point

• process

A   ?   is information in the form of a pneumatic pressure, an electric current, or mechanical position that carries information from one control component to another.

• control loop

• signal

• primary element

• process variable

A   ?   is any variable property of a process. It is the part of the process that changes and, therefore, needs to be controlled.

• set point

• deviation

• process variable

• signal

A   ?   is the primary source of instrument information when ordering, designing, installing, maintaining, and calibrating an instrument.

• specification sheet

• primary element

• P&ID

• loop

A(n)   ?   is a process and instrumentation drawing or diagram.

• instrument

• loop sheet

• P&ID

• specification sheet

A(n)   ?   is a control signal that is on or off, open or closed, run or stop, etc.; one of two possible states or conditions.

• discrete signal

• analog signal

• electrical signal

• set point

 ?   is a term used broadly to describe any device that performs a measuring or controlling function. The process variables measured by the device may be used for indication, recording, or control.

• Final Control Element

• Instrument

• Transmitter

• Controller

  ?   is the difference between the upper and lower limits of a range that is expressed in the same units as the range. It is the difference of the URV and LRV.

• accuracy

• deviation

• span

• zero