Introduction; Safety Measures - Mettler Toledo Refracto 30PX Bedienungsanleitung

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Introduction

The METTLER TOLEDO Refracto 30PX and 30GS are portable measuring devices
suited for determining the refractive index of liquids. These devices determine the
refractive index by measuring the critical angle of total reflection of a light beam
falling on the sample. To carry out measurements, the sample is either pipetted
onto the measuring cell or the measuring cell is immersed directly in the sample.
The two Refracto versions are equipped with different measuring cells. The Re-
fracto 30PX has a measuring cell made of optical glass, whereas the Refracto
30GS has a measuring cell made of sapphire. Sapphire has a higher refractive
index and a better thermal conductivity than glass. For this reason the Refracto
30GS has an extended measuring range (nD max. = 1.65) compared to the
Refracto 30PX (nD max. = 1.50) and registers the sample temperature more
quickly.
The results are automatically calculated into one of the following units: Refractive
index, Brix%, HFCS42, HFCS55, °Baumé, °Oechsle (CH,D), °KMW (Babo), T.A.
1990, % weight, % volume, specific gravity and freezing point (in °C or °F) of
sodium chloride solutions and ethanol/water mixtures, % weight, % volume and
freezing point (in °C and °F) of ethylene glycol and propylene glycol/water mix-
tures, % weight and % volume of isopropanol/water mixtures or a user-defined
unit. The value is then shown on the backlit display.
For exact measurements, it is imperative to correct the temperature's influence on
the refractive index. The Refracto registers the sample temperature and automati-
cally corrects the result. For the correction it uses either internally-stored tables or
one of the 10 temperature-compensation coefficients entered by the user.
The results, along with the sample identification, temperature, temperature-com-
pensation coefficient, date and time, can be saved to the device. They can then,
together with the instrument identification, be transferred via the integrated infra-
red interface to a computer or to a printer.
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Safety measures

Measures for your protection
- Do not work in an explosion-hazardous environment ! The in-
strument housing is not gastight. Otherwise, there is a risk of
explosion from sparks and/or risk of corrosion by gasses which
can seep in.
Measures for operational safety
- When doing dip-in measurements, never immerse the instrument
deeper into the sample than the indicated line. The instrument is
only resistant to splashed water.
- Use batteries of the specified type only. Otherwise, proper opera-
tion cannot be guaranteed.
- Ensure that the following environmental conditions are met:
• no strong vibrations present
• not in direct sunlight
• no high humidity present
• no corrosive gasses present
• temperature between – 20 °C and 70 °C
• no strong electrical or magnetic fields present
METTLER TOLEDO Refracto 30PX/GS
Introduction / Safety measures
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