Cooper Instruments & Systems DFI 250X Digital Weight Indicator - Manual (Page 16)

CF 147 12 version 1.1
When leaving the factory, the <FUNCTION> key is blank and has no primary function preprogrammed.
The primary function of this key can be selected from a number of different functions including peak-hold,
counting, etc. Refer to Special Functions section 11.0 for details of the available functions. Each primary
function has an associated overlay sticker that should be applied to the <FUNCTION> key to label the function of
the key.
Long Press: A long press of the key may be used for certain functions depending on the primary
function of the key.
6.0 CONFIGURATION ISSUES
6.1 General Setup Information
Configuration and calibration can be performed entirely from the front panel, using the digital setup facility. When
Full Setup is used, all menu items are accessible and care must be taken to ensure no accidental changes are
made to calibration and trade settings. In addition, there is also Safe Setup that provides restricted access. This
setup method ensures that only settings that are not calibration or trade sensitive can be changed.
Full and Safe Setup can be passcode-protected to prevent unauthorized or accidental tampering. If the scale has
been passcode-protected, the setup menus cannot be accessed until the correct code has been entered.
6.2 Basic Weighing Terminology
The following terms are used throughout the setup procedure. Knowledge of these basic weighing terms is
beneficial in setting up and calibrating the instrument.
Note: Descriptions of these and other terms used in this manual are listed in the Glossary Terms section 12.6.
Term
Definition
Units Units of measurement (kilograms, tons, pounds, etc.).
Full Scale Total change in weight between zero gross load and full capacity gross load.
Resolution or Count-by Smallest change in weight units that the display can show.
Total Number of
Graduations Maximum number of display steps between zero gross load and full capacity gross
load. It is equal to full scale divided by the count-by.
Division A single graduation.
Example
This example provides a check to ensure the capability of an indicator to read a stable weight on extremely small
divisions compared to the load cell capacities.
The check is to find out what the micro-Volt per division is and then compare this to GSE Scale System’s
specification. If GSE Scale System’s specification is smaller than the calculated value, the unit is within the
requirements of operation.
Note: The capability of an indicator may be different than the trade approval limit of the micro-Volt per division.
A 10,000lb 2.0mV/V load cell is used in an application requiring a 5000lb full scale, with weight displayed in 5lb
increments.
The values are:
•
Units = lb
•
Full Scale = 5000
•
Count-by = 5
Calculating the total
number of
graduations:
Total Number of
Graduations
=
Full Scale
Count-by
=
5000
5
= 1000 divisions
Signal voltages can be calculated as follows:
Calculating the full
scale signal (load cell):
Full Scale
Signal
=
Full Scale
Load Cell
Capacity
=
5000
10000
x 2.0mV/V = 1.0mV/V