Instruction manual. Allen wrench for detaching/attaching prism. ACCESSORIES. SPECIFICATIONS. DIGITAL ABBE REFRACTOMETER. 2. Refraction view. B+S code. Abbe Refractometer see below for part number comprising: 1 Operating Instructions. 1 Instruction manual CD-ROM. 1 Power supply. Stanley Ltd. can assume no responsibility for errors contained in the manual or their consequences. Abbe 5 Refractometer complete with accessories.
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The focus of this page is not to provide an exhaustive treatise on the theory of refractometry, and so the interested reader is referred to the literature for more information. There are two refractometers available for your use; a Bausch and Lomb, shown in Fig.
This document will give a brief general overview of the operating procedure and will point out where the instruments differ in either control layout or in order of operations. The Bausch and Lomb refractometer right side view.
On this instrument the compensator is a dial located on the front of the instrument behind a protective plastic window in this view below the eyepiece and above the sample stage. The prism coarse adjust and fine adjust knobs are the large and small knobs, respectively, located on the right side of the instrument.
On this instrument the power switch is at the rear. Note the presence of what appear to be knobs one large one at the front and a smaller one at the rear which are the bulbs for illuminating the sample and the scale.
Unlike the Bausch and Lomb, the Fisher refractometer has only one prism adjusting knob. The light source for this instrument is internal, but it can be viewed through the vent holes on the right side just below the sample stage. Before starting the instrument check that the water connections are tight, and that the sample stage is clean and dry. The following solvents and compounds cannot be analyzed on this refractometer: DMF; phenols, cresols and other tar acids; acetic acid solutions; N, N-dimethylacetamide; THF; mixtures of esters especially methyl acetate and vinyl acetate ; some lacquer thinners; strong mineral acids and bases.
If desired, turn on the water bath and set it for Allow the bath to warm up for several minutes before checking the thermometer on the side of the refractometer to verify that the proper temperature has been reached; adjust the temperature of the water bath as needed. Turn on the refractometer on the back of the Bausch and Lomb, or on the left side of the Fisher. If you are using the Bausch and Lomb, the light in the clear ball on the swing arm should come on, while you should observe light coming through the vent holes on the right front of the Fisher just below the sample stage.
To place a sample in the Bausch and Lomb, swing the light source out of the way forward and down and open the upper prism case the metal case in the center of the instrument.
For the Fisher, first disengage the sample stage latch and swing the upper prism assembly toward you.
Operating Instructions for Abbé Refractometers
Place a drop of the sample on the sample stage and close the upper prism case. For the Bausch and Lomb move the light source into position, while for the Fisher simply close the latch. It is important that you do not use too much sample which makes a mess and can decrease accuracy or too little sample which will result in a poorly defined borderline, vida infra.
To see the scale on the Bausch and Lomb, depress and hold the contact switch on the left rear of the instrument while looking through the eyepiece. This switch toggles between the two views shown in Fig. The scale should look like that shown in Fig.
On refractpmeter Fisher refractometer both views are displayed simultaneously, as shown in Fig. Once the you have made manuxl coarse adjustment on the Bausch and Lomb, release the switch to view the boundary line with the Fisher refractometer, you only need to shift your focus upward.
If you do not know the approximate index of refraction, you can simply observe the position of the borderline and use the prism adjusting knob to bring the borderline to the center of the viewing field.
manuap View through the eyepiece of the Fisher refractometer. With the borderline near the center of view, adjust the compensator dial to remove any color it may not be possible to remove all color. Focus the borderline sharply by adjusting the eyepiece.
Operating Instructions for Abbé Refractometers | Chem Lab
Bring the borderline into the crosshairs, as shown in Fig. Read the index of refraction by depressing and holding the switch on the left rear of the Bausch and Lomb, or directly on the Fishersee Fig.
Three decimal places can be read directly regractometer the scale; a fourth place can be estimated. When you are finished measuring a sample, use a Kimwipe to dab away any remaining sample. Wash the sample stage with a small amount of wash acetone and gently pat dry. Close the upper prism case. The upper prism case should be closed at all times, except when a sample is being loaded or the sample stage is being cleaned.
At the end of the day, clean the sample stage, and close abeb upper prism case. Turn off the refractometer. Switch off the water bath, if it was used.