Leica 13104810, 13104940, 13104950 8English, Servicing, Care and Cleaning, Specifications, Fuses

10.1 Fuses

Warning: Unplug the Refractometer Power Cord before attempt- ing to check or replace fuses.

!CAUTION: Replacement of fuses is not user serviceable. Fuses must be replaced by qualified service personnel. The fuse shall be replaced only with the same size, type and rating.

The LEICA ABBE MARK II Refractometer electrical circuitry is protected by two (2) fuses. To replace the fuses turn the Adjust- ment Control Knob (Figure 1) two turns clockwise. This raises the elevator assembly to provide clear access to the fuses. Remove the adjustment control knob with a 1/8” Allen wrench. Remove the two Phillips head screws which hold the right panel cover to the bottom of the instrument housing. Slide the panel cover down as far as possible to facilitate its removal. With the right panel cover removed the fuses will be visible on the bottom plate of the instrument (Figure 5b). Replace the fuses and reassemble.

NOTE: Do not wipe the measuring prism surface dry and do not wipe it with anything if it is dry. Do not contact the prism or the surrounding seal with metal or with sharp or pointed objects.

The glass parts of the prism assembly are relatively hard and have excellent resistance to staining. Strong acids or bases should not be measured with this instrument, nor used as clean- ing agents.

To clean the eyepiece, snap out the rubber insert at the end of the adjustable eyepiece tube. Clean the lens with a cotton swab or lens tissue lightly dampened with acetone or methanol. Replace the rubber insert.

12.0 SERVICING

The LEICA ABBE MARK II and LEICA ABBE MARK II Plus Refractometers should be serviced or repaired by factory- trained service and repair technicians. If operating difficulty is experienced contact Leica’s Refractometer Customer Service Department at 716-686-3000 or fax 716-686-3085. Outside the United States contact your local Leica representative.

11.0 CARE AND CLEANING

The LEICA ABBE MARK II Refractometer is a precision optical in- strument designed for years of trouble-free operation. The interi- or design has been carefully constructed for protection from dust or spills. The exterior is painted with a durable enamel. The stain- less steel refractive prism assembly is sealed with corrosion- resistant epoxy.

The use of strong solvents such as N, N-Dimethylformamide or N, N-Dimethylacetamide, cresols, phenols and other tar acids or strong acetic solutions should be avoided. Materials such as Tetrahydrofuran or some lacquer thinners and their components can deteriorate the prism seal over a long period of time or when applied in elevated temperatures.

An accumulation of dust, solvents or sample, particularly on the prism assembly, may eventually penetrate the refractometer and affect accuracy or accelerate wear.

When the instrument is not in use, the measuring prism assembly should be kept closed with a folded sheet of lens tissue between the prisms. The prism surfaces should be cleaned with distilled water, methanol or an appropriate solvent immediately after each sample is used.

Warm distilled water is recommended for removing sugar residues and methanol for oil-based samples. The prism may be wiped with lens cleaning tissue, but it should not be wiped with a hard, dry cloth. After wiping the sample from the prism, rinse the prism again with distilled water.

13.0 SPECIFICATIONS

LEICA ABBE MARK II Refractometer Model 13104800/13104810 LEICA ABBE MARK II Plus Refractometer

	Model 13104940/13104950
Display	Direct reading LED
Modes of Operation	Refractive index (nD),
	%Solids (OBrix) and
	temperature compensated
	Brix - BX-TC
Modes	Range
nD	1.3200-1.7000
Brix	0-95
BX-TC at 20O	0-95
Temperature OC	15º-50ºC
Power Requirements
Model 13104800	115V/60Hz
Model 13104810	230/50Hz
Model 13104940	115V/50-60Hz
Model 13104950	230V/50-60Hz

	Socket Adjustment	Revolving Condenser
	Screw	Sleeve
Illuminator Arm		Illuminator Bulb

Figure 5b Figure 6

8English