LIMIT 1800 Guia Del Usuario página 2

English
Limit 1800
Refractometer designed to provide a rapid, accurate method
of determining the concentration of water solvable, cutting
fluids and other industrial lubricants. Designed to assist
machine operators in maintaining the optimal water/coolant
balance in order to reduce tool wear and increas feed and
speed rates.
The LIMIT 1800 is equipped with ATC that automatically
adjust itself to compensate for temperature variations during
use. Capable of measuring BRIX-value with high accuracy
with a bright and sharp scale for easy and comfortable
reading. Uses only ambient light, no batteries are needed.
Featuring robust design unlikely to break down if properly
taken care of.
Method of calibration and operation:
1) Aim the front end of the refractometer in the direction of
bright light and adjust the focus using the eye piece.
2) Adjustment and calibration of null:
Open the daylight lid and place 2-3 drops of distilled water
on the prism. Close the daylight lid, press in order to spread
the water across the entire surface. Make sure there are
no air bubbles or dry spots. Allow the sample of water to
remain on the prism for approximately 30 seconds. Then,
when needed, adjust the calibration screw until the light/dark
boundary coincides with the null line at the very bottom of
the scales. Adjustment of refractometer shall be made under
the condition of 20ºC surrounding temperature. If working
temperature of the room or environment changes by more
than 5ºC re-calibration is recommended.
3) Operation procedure after calibration is essentially the
same as the calibration procedure described above. Open
the daylight lid and clean the surface of the prism using
a soft cotton cloth. Place 2-3 drops of the solution on the
prism. Close the daylight lid and press gently, read the
corresponding scale at the light/dark boundary. The reading
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