Hach-Lange REFO 60_REFO 60D - Manual (Page 20)

Operating Instructions REFO 60 / REFO 60-D
6
•
To increase the displayed number, press the control button Then wait
for the next digit to blink.
•
When the setting is finished, the entire standard number blinks until you
acknowledge the value with the control button.
•
Now the display shows the blinking calibration value which is to be entered
just like the standard number before.
C2.2 Maintenance of the Calibration Standard
Poor accuracy or repeatability of measurings is often due to improper handling of
the working standards. Gloss being a surface property, utmost cleanliness is of
vital importance. Even slight irregularities caused by nicotine, dust, fingerprints
or scratches can lead to mismeasurements.
The standards can be cleaned carefully with glass cleaning agent and a soft
tissue.
ATTENTION: Do not touch the standard surface with your fingers when
cleaning it.
The calibration values of the standards remain valid for two years.
Standards LZM 150 and LZM 154 are provided with a quality control certificates
according to DIN 55350 part 18, 4.