9
V. STANDARD CALIBRATION PROCEDURE
The standard CALIBRATION procedure should be performed at a minimum, every 4-hours of use, to maintain
instrument accuracy. Calibration can be performed more frequently if desired. Additionally, once the
DATE/TIME is set, the computer keeps track of calibration intervals and will also prompt the user to recalibrate
every 24-hour cycle when the time reaches 00:00:01.
The E20CP-III also automatically calibrates each time the sample drawer is opened. It reads the Yellow Life
Disk under the drawer and adjusts to a reference established during the standard calibration procedure.
The E20CP-III can be configured to read samples in the Commercial Scale (the standard scale for E20CP
models), the Gourmet Scale (the standard scale for Agtron M-BASIC models), or a user defined Custom Scale.
The Commercial Scale offers greater dynamic range (the capacity to measure a wider range of roast
classifications and grinds including soluble coffee powders)
The Gourmet Scale offers higher resolution (shows a greater difference in scores between two roast
classifications)
The Custom Scale allows the user to arithmetically modify the Commercial Scale
The E20CP-III can also be calibrated with REFERENCE COFFEE SAMPLES of known or desired score
(see section VIII. “Non-Standard Scale Calibration”)
1) Remove the two-sided Red-Black Calibration Disk set and dish from its storage box
IMPORTANT: The two-sided calibration Disk & Dish set supplied with the analyzer is your permanent
calibration reference. Disk & Dish sets are matched by serial number to a specific E20CP-III and can
only be used with that unit.
NOTE:
There are two adhesive labels affixed to the side of the Calibration Reference Disk dish. One label lists
the red-side and black-side calibration reference scores; these disk values are pre-programmed into your
analyzer at the factory. The other label shows the unit serial number and disk certification date.
NOTE:
Avoid touching the surface of the disks. Periodically clean the disk surfaces with a dilute solution of
alcohol and pure water and a soft cotton cloth using very light pressure. Keep the disk set stored in the box
provided, away from direct sunlight or heat
.
●
Do not
leave the calibration disk set in the analyzer
●
Do not
use the dish supplied with the calibration disk set for coffee samples
IMPORTANT:
Always place the calibration disk into the shallow side of the dish
2) Momentarily depress the [
CAL]
key on the function keypad
The display will show: -
OPEN SAMPLE DRAWER
-
< SET REFERENCE MODE >
3) Fully open the sample drawer
The display will show: --
HIGH REFERENCE
--
RED-DISK / SAMPLE
