English Deutsch Français Italiano Español Português 繁體中文 Bahasa Indonesia Tiếng Việt ภาษาไทย
All categories

2007-10-02 15:46:53 · 3 answers · asked by element69ca 1 in Science & Mathematics Engineering

3 answers

In regards to calibration, span is the range of a physical property being measured which is correlated to a representative range of a signal or indicator. (Span is the max value minus the min value.)

A 100psi bordon pressure gauge indicates pressure from 0-100 psi. The span is 100 psi, the gauge converts the physical pressure to a mechanical movement which is indexed to a faceplate scale.

Span adjustment of this type of gauge would be done via mechanical linkage adjustments so that the needle movement from 0 to 100 would match the applied pressure from zero to 100 psi


You will find span and offset adjustments on other types of signal transmitters especially electronic transmitters which are providing an electronic output signal such as 4-20ma of 0-10V

Offset is an adjustment which slides the span up an down a range it is usually used for zeroing. (setting the starting point of the range which the span starts.

For an electronic tranmitter a 0 to 100 psi physical measurement is converted into a 4 to 20ma signal where 4ma represents 0 psi and 20ma represents 100psi

The input span is 100 -0 = 100 psi while the output span is 20-4=16ma. So a 100psi span in pressure is converted into a 16ma span of current flow.

These adjustments are done during calibration where accurate physical forces are applied to the instrument. The span and offset settings are adjusted so that the instruments output accurately indicates a value which represents the value of the applied standard.

2007-10-03 00:37:03 · answer #1 · answered by MarkG 7 · 2 0

Span Gauges

2016-12-16 08:35:55 · answer #2 · answered by vanderburg 4 · 0 0

What Is Span

2016-10-04 22:41:54 · answer #3 · answered by Anonymous · 0 0

fedest.com, questions and answers