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 Bausch and Lomb refractometer right side view. Unlike the Bausch and Lomb, the Fisher refractometer has only one prism adjusting knob.
Operating Instructions for Abbé Refractometers | Chem Lab
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 refractomteer sample stage. For the Bausch and Lomb move the light source into position, while for the Fisher simply close the latch. Close the upper prism case.
Wash the sample stage with a small amount of wash acetone and gently pat dry. Three decimal places can be read directly from the scale; a fourth place can be estimated. 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 abbf operations.
Turn on the refractometer on mznual back of the Bausch and Lomb, or on the left side of the Fisher. 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.
Once the you have made the 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. There are two refractometers available for your use; a Bausch and Lomb, shown in Fig.
Operating Instructions for Abbé Refractometers
If desired, turn on the water bath and set it for Allow the bath to warm refrwctometer 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. The scale should look like that shown in Fig.
When you are finished measuring a redractometer, use a Kimwipe to dab away any remaining sample. Before starting the instrument check that the water connections are tight, and that the sample stage is clean and dry.
View through the eyepiece of the Fisher refractometer. The upper prism case should be closed at all times, except when a sample is being loaded or the sample stage is being cleaned.
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. This switch toggles between the two views shown in Fig. 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.
Bring the borderline into the crosshairs, as shown in Fig. The prism coarse adjust and fine adjust knobs are the large and small knobs, respectively, located on the right side of the instrument. Turn off the refractometer. Place a drop of the sample on the sample stage and close the upper prism case.
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. Focus the borderline sharply by adjusting the eyepiece. Note the presence of what appear to be knobs one large one at the front and a smaller one refracfometer the rear which are the bulbs for illuminating the sample and the scale. If you are using the Bausch and Lomb, the light in the clear ball on the swing arm reftactometer come on, while you should observe light refractoeter through the vent holes on the right front of the Fisher just below the sample stage.
At the end of the day, clean the sample stage, refractoneter close the upper prism case.
Switch off the water bath, if it was used. The light source for this instrument is internal, but it can be viewed through the vent holes on refactometer right side just below the sample stage. On the Fisher refractometer both views are displayed simultaneously, as shown in Fig.
On this instrument the power switch is at the rear.