Radar level instrumentation terminology - Just Measure it

Radar level instrumentation terminology

Range

The area of variation between upper and lower limits on a particular scale.

Measurement Range

The measured range is within a precisely defined range in which defined agreed, or guaranteed error limits are not exceeded.

Lower limit value of measuring range

The minimum value to be measured within the exact specified range

Upper limit of measurement range

The maximum value to be measured within the exact specified range

Performance Features

Parameters related to the functions and capabilities of level measuring instruments and their quantitative expression

Reference performance characteristics

Performance characteristics achieved at reference operating conditions

Scale

An ordered set of markers and all relevant numbers

Scale range

The range bounded by the beginning and end values of the scale

Linear scale

The spacing of each compartment in the scale is in constant proportion to the corresponding compartment value

Non-linear scale

The spacing of each scale division in the scale is non-numerically proportional to the corresponding division value

Suppression of zero scale

In the scale range, the scale value corresponding to the measured zero value is not included, such as the Scale of a medical thermometer

Extended Scale

In the scale range, disproportionate extensions account for most of the scale length

Scale Numbers

The whole set of numbers marked on the scale corresponds to the measured value identified by the scale mark, or only the numerical order of the scale mark

Scale Marking

Scale lines or other marks indicating the measured value on the device

Scale compartment

The scale value between two adjacent scale marks

Scale compartment value

The difference between the measured values of two adjacent scale marks in the scale is also called the grid value.

Scale divider spacing

The distance between the centerlines of any two adjacent scale marks measured along the same line segment represents the length of the scale

Scale Length

The length of the line segment passing through the midpoint of all shortest marks on a given scale between the beginning and end scale marks, either as a real or imaginary curve or line

Scale Start Point Value

The measured value corresponding to the scale start point mark

Scale end point value

The measured value corresponding to the scale end mark

Zero Mark

Also called the zero scale line, the indicator has a “0” number scale mark

Zero position of level measuring instrument

When any auxiliary energy required for the operation of the level measuring instrument is turned on and the measured value is zero, the direct indicated value of the instrument

Instrument constants

In order to obtain the indicated value of the instrument, a factor must be multiplied by the direct indicated value. If the direct value is equal to the measured value, the constant of the measuring instrumentation is 1

Calibration

The operation to establish the relationship between the indicated value of a measuring instrument or measuring system or the value embodied in a physical gauge and the known value corresponding to the measured under specified conditions

Calibration Curve

A curve that represents the relationship between the measured value and the actual measured value of the instrument under specified conditions

Standard cycle

Combination of upward and downward calibration curves between instrument calibration range limits

Error Limits

That is, the maximum permissible error, the limit of the instrumentation error specified by the standard technical specifications

Traceability

A characteristic of a measurement result that can be linked to an appropriate standard, (usually an international or national standard) by a continuous chain of comparisons

Sensitivity

The output variation of the meter divided by the corresponding input variation value

Precision

The degree of agreement between the displayed value of the instrument and the measured value

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