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- Gage Factor
- Measure of the ration of the relative change of resistance to the relative
change in length of a resistive strain sensor (strain gage).
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- Gage Pressure
- Form of differential pressure measurement in which atmospheric pressure is
used as a reference.
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- Gain
- Ratio of change in output to change in input that caused the change.
Reciprocal of Proportional Band. Amplification of a circuit. Gain in the process
is defined as the change in input divided by the change in output. A process
with high gain will react more to the controller output changing.
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- Gain (of the controller)
- Another way of expressing the "P" part of the PID controller. GAIN =
100/(Proportional Band). The more gain a controller has the faster the loop
response and more oscillatory the process.
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- Gain Margin
- The difference in the logarithms of the amplitude ratios at the frequency
where the combined phase angle is 180 degrees lag is the gain margin.
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- Gain Range
- The maximum and minimum voltage that will be digitized by the A-D converter
is sometimes called the gain range.
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- Gain Scheduling
- Predefined separate GAIN tuning values automatically applied to predefined
process variable regions.
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- Glass Cover
- Glass covers may protect a sensor against mechanical or
chemical damage, such as welding sparks or strong solvents.
.
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- Gravity Unit
- One gravity unit (abbreviated g) is an acceleration of 32.2 feet per second
per second.
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- Ground
- (1) A conducting path, intentional or accidental, between an electric
circuit or equipment and the earth, or some large conducting body serving in
place of the earth (a voltage reference). (2) An electrical line with the same
electrical potential as the surrounding earth. Electrical systems are usually
grounded to protect people and equipment from shocks due to malfunctions. Also
called safety ground.
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- Ground Loop
- A condition created when two or more paths for
electricity are created in a ground line, or when one or
more paths are created in a shield. Ground loops can create
undesirable noise.
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- Ground Potential
- The electrical potential of the earth. A circuit,
terminal or chassis is said to be at ground potential when
it is used as a reference point for other potentials in the
system.
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- Grounded Thermocouple
- A thermocouple constructed in such a way that the
measuring junction is an integral part of the sheath
material. Electrical isolation is not provided in this type
of construction.
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- Guaranteed Soak
- Guarantees a setpoint programming segment’s process variable is within
deviation for configured soak time. When deviation is exceeded, soak timing is
frozen.
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