Calibration Methods; Calibration Modes - Cardinal 225 Installation And Technical Manual

CALIBRATION METHODS

The 225 has two methods to enter the calibration procedure. One method is selected from the
SETUP/REVIEW MENU and the other method selected from SETUP MENU #2.
From SETUP/REVIEW MENU:
With the SETUP/REVIEW MENU displayed, press the 3 key and then the ENTER key. This
method proceeds directly to a display showing the settings for the capacity, interval, decimal
point position and the first calibration parameter, CAL 1=0.0.
From SETUP MENU #2:
With the SETUP MENU #2 displayed, press the 5 key and then the ENTER key to proceed
to SCALE 1 CALIBRATION MENU. With the SCALE 1 CALIBRATION MENU displayed,
press the 1 and 0 keys and then the ENTER key. This method will change the SCALE 1
CALIBRATION MENU to show the settings for the capacity, interval, decimal point position
and the first calibration parameter, CAL 1=0.0.

CALIBRATION MODES

The 225 indicator has seven modes that can be used to perform calibration. Four of the
modes require a test load (weight), one requires the scale to be empty (and at zero) and the
last two use parameter values or the calibration "C" numbers from a previous calibration. The
calibration modes are as follows:
1. Multi-Point
This method requires two weights, an empty scale and has two conversion factors. It uses
three calibration points, CAL 1=, CAL 2= and CAL 3=. The three points correspond to
zero weight, mid-point weight and test load (weight) and can be applied in any order.
2. Dual-Point with Zero (First Zero)
This is a standard calibration method requiring one weight, an empty scale and has one
conversion factor. This method uses two calibration points (CAL 1= and CAL 2=) to
establish a zero (no load) calibration value and to span the indicator. The two points
correspond to zero weight and test load (weight) and can be applied in any order. This
method should be used for first-time calibration and complete recalibration.
3. Dual-Point without Zero (False Zero)
This calibration method requires one test weight and establishes a new conversion factor
only. It is used to establish a false (temporary zero) zero without affecting the zero
calibration value stored during the last calibration. This is particularly useful in tank
weighing applications, where it may be impractical or impossible to completely empty the
tank. This method uses two calibration points, CAL 1= and CAL 2=. The value of the
test load (weight) is entered when CAL 1= is displayed and then the NET/GROSS key
pressed when CAL 2= is displayed.
CALIBRATION AND SETUP, CONT.
8200-M698-O1 Rev B  225 Installation and Technical 77