Hach-Lange REFO 60_REFO 60D - Manual (Page 19)

Operating Instructions REFO 60 / REFO 60-D
5
C Applications
C1 Calibration
It is recommended to calibrate at least once a day.
•
Turn REFO on with the control button ; the display reads 60°
•
Put REFO on the standard, remove protective cloth first
Start the calibration with the control button , the display reads *Cal* ,
followed by the reflectometer value of the calibration standard XXX.X
C2 Calibration Standards
For gloss measurement according to DIN 67530 the for standard A (LZM 150) is
used. This is a polished black glass tile. For high-gloss measurements (only
REFO 60-D), however, standard metal mirror (LZM 154) according to ISO 7668
is necessary.
The calibration values at 60° are found on the back of the certified standard,
together with the standard number which ensures retraceability.
Do not touch or scratch the standard surfaces. Cover them as soon as they are
out of use and keep them in a safe, preferably dark place.
C2.1 Entering standard number and calibration values
You need only enter a new calibration value after changing the standard. REFO
60-D recognizes the standard on which it operates. The 4-digit standard number
and the reflectometer value for 60° are indicated on the bottom of the standard.
•
Turn on REFO 60 with the control button , display 60°
•
Place the instrument on the standard
•
Hold the control button down for approx. 10 seconds; the display
reads CAL first, then the calibration value XXX.X and at last the blinking
standard number XXXX .