Laurel-electronics Laureate Meters with Custom Curve Linearization Manuel d'utilisateur télécharger pdf

LAUREL

ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1

LAUREL

ELECTRONICS, INC.

Laureate™ Meters with

Custom Curve Linearization

Key Features of Meter Linearizing

• Applicable to Laureate™ process, strain gauge, load cell meters, frequency /

rate meters, and totalizers

• Easy programming using custom nonlinear curve fits

• Improves accuracy of low-cost transducers

• Extends transducer operating range on high and low ends

• Solves application problems involving non-linear relationships

• Included with Extended versions of Laureate digital panel meters, counters

and timers

• Easy setup by entering data points into a computer spreadsheet, or typing in

desired readings for actual signal inputs.

• Exceptional accuracy from 0.1% to 0.01% of full scale with few data points,

made possible by curvilinear spline fits.

Description

Custom curve linearization is a feature available with the

Extended option version of all Laureate digital panel meters,

counters and timers, excluding only the temperature meter,

which already has built-in linearization curves.

Benefits: Custom curve linearization can provide exceptional

accuracy from low cost transducers of these are repeatable. It

can extend the working range of transducers on their high and

low ends. It can also solve special application problems where

there is a non-linear relationship between the input and the

desired readout.

Implementation: Linearizing is implemented in the form of

20 nonlinear spline-fit segments, which provide much better

accuracy than a larger number of straight line segments. The

typical error will be from 0.1% to 0.01% of full scale, depending

on the number of data points used for setup, the error in the data

points, and the severity of non-linearities or discontinuities.

Easy Setup: Setup of a Laureate Linearizing Process Meter

requires an external PC, which is connected to the meter via

RS232 or USB cable, and utilizes linearizing software furnished

by Laurel Electronics. To download, go to our Software Down-

load web page. A serial communications board is required, but

can be removed from the meter following setup. Three meter

programming methods are offered:

• Spreadsheet Method: Data points consisting of the input

signal in Volts or Amps and the desired reading are entered

into an Excel spreadsheet or into a text file using a space,

comma or tab as the delimiter. There can be up to 180 data

points. Laurel's software then calculates 20 spline-fit seg-

ments and downloads their coefficients into the meter.

• Actual Input Method: The meter is hooked up to the actual

signal source, and the user enters the desired readings for

different signal levels. There can be up to 180 input / reading

combinations. Laurel's software then calculates 20 spline-fit

segments and downloads their coefficients into the meter.

This method automatically compensates for any errors in the

transducer.

• Polynomial Method: The mathematical formula relating the

input to the output is entered into the computer, which then

uses this data to calculate the spline-fit segments. This

method is ideal if the mathematical relationship is knows, for

example to calculate the contents of a tank based on the

known geometry of the tank.

Application Examples

• Thermistors and other sensors whose output is a non-linear

changing resistance.

• Altimeters, since the relationship between pressure and

altitude is non-linear.

• Rate of ascent based on successive altimeter readings.

• Volume of irregularly-shaped tanks, such as horizontal

cylinders, based on measured liquid level or liquid pressure at

the base of the tank.

• Fine-calibration of linear transducers, since even nominally

linear transducers will have nonlinear components.

• Extending the working range of transducers, since many

transducers become nonlinear at their low and high ends.

Compensating for inaccuracy of low-cost transducers.

Measuring tank volume

The Extended Laureate process meter can display the volume of

irregularly shaped tanks based on the static pressure at the base

of the tank. An example is a cylindrical tank lying on its side. The

tank can be tilted to facilitate drainage, as illustrated.

1 2 3

Résumé du contenu

Page 1 - ELECTRONICS, INC

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1 LAUREL ELECTRONICS, I

Page 2 - Ordering Guide

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 2 Ordering Guide Create

Page 3 - Mechanical

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 3 Load Cells (6-wire rat

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Laurel-electronics Laureate Meters with Custom Curve Linearization Manuel d'utilisateur

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