ANALOGUE REFRACTOMETRE (HONEY)
SERVICE
After reading this operating manual, if you have any questions about setting up or using the
refractometer, or if any unexpected problem occurs, please contact your dealer.
WARRANTY!
The warranty shall be void in the event of:
• Failure to observe the instructions in the operating manual
• Use for purposes other than those described
• Changes or opening of the appliance house
• Mechanic damage and/or damage in cause of media, uids, natural wear
OPERATION AND FUNCTION
Zero Point Calibration and measurement procedure
The refractometer can be used to determine the refractive index of transparent substances,
liquid or solid ones quickly and accurately. To ensure correct measurement, the measuring
device should be adjusted before measurements are carried. out. Please make sure your
hands are dry before handling the measuring device.
1. Start by removing the protective lm (if present) from the prism surface [2]
and check that the rubber eyecup [4] is tted correctly.
2. Hold up the refractometer against a sufciently bright light source and look through
the eyepiece [5], holding the rubber eyeshade [4] closely against your eye/glasses.
3. Rotate the eyepiece [5] to adjust it for your eyesight, until you can see the scale sharply.
4. Open the prism cover [1].
5. Thoroughly clean the prism [2] and the underside of the prism cover [1] using a soft
cloth or soft paper (with alcohol if necessary) and wipe dry.
6. Now apply a few drops of the calibration liquid [10] onto the prism surface [2].
7. Close the prism cover [1]. The amount of uid should be sufcient to moisten most of
the prism surface. There should not be any air bubbles between the measuring prism
[2] and prism cover [1].
8. Wait about 30 seconds to allow the temperatures of the uid and prism to equalize.
9. Look through the eyepiece [4] while pointing the prism surface [2] at a bright light source.
10. Through the eyepiece [4], you will see a bright and a blue eld. The boundary line
between them shows the measured value on the scale which is also visible
through the eyepiece [4].
11. Use the supplied adjustment tool [11] to turn the adjustment screw [3] behind the
prism surface [2] (under the rubber cap) and adjust the scale so that the measuring
device is optimally set up by moving the boundary line upwards or downwards.
12. Repeat step 4 (cleaning).
MEASUREMENT PROCEDURE
It is important that the samples being measured are representative samples. For samples that
evaporate easily, measurements should be carried out quickly. The samples should be at the
same temperature as the measuring instrument in order to achieve an accurate result.
1. Make sure your hands are dry before handling the refractometer.
2. Open the prism cover [1] and use the supplied pipette [8] to apply a few drops of the
sample liquid [8] onto the prism surface [2]. Close the prism cover [1]. Spread the liquid
evenly by pressing down on the prism cover [1] and eliminate any air bubbles present.
3. Hold the device horizontally and wait about 30 seconds (for optimal temperature equal
ization between the sample and device).
4. View the measurement scale through the eyepiece [4]. Point the prism surface [2] of the
refractometer at a bright light source while doing this.
5. Rotate the adjustment ring [5] on the eyepiece [4] to adjust the focus.
6. The boundary line will move on the measurement scale depending on the
concentration. This bright/dark boundary line shows the result on the scale.
7. If the temperature deviates from +20 °C and a refractometer without ATC is used,
correct the measured result using the corresponding value from the temperature
correction table [13].
8. Carefully clean the supplied pipette [8] and the refractometer after carrying
out the measurement.
IMPORTANT!
After every measurement, use a lint-free, absorbent cloth to remove the uids from the prism
surface [2] and prism cover [1]. Then carefully clean the prism and prism cover using a
cloth moistened with water or if necessary, alcohol, and dry both parts using a soft,
dry and lint-free cloth. Avoid rubbing the prism [2].
Model Measuring range Scale
resolution
Scale accuracy Product
dimension
Net.
weight
15 3 0 5 21 0 58-90% Brix
12-27% Water
0.5% Brix
0.5% Bé
1% Water
±0.5% Brix
±0.5 Bé
±1% Water
145 × Ø40 mm 193 g
15305215 10~30% Moisture 0.1% ±0.1% 170 × Ø40 mm 207 g
CLEANING AND MAINTENANCE
Clean the refractometer using a soft, lint-free cloth moistened with either water or,
if necessary, alcohol. Do not use any aggressive or abrasive cleaning agents. Never
immerse the device in water or hold it under running water. Never handle the device
with wet or damp hands. Never touch the measuring prism [2] with hard tools made
from plastic, wood, rubber, metal, glass etc. Hard objects can quickly damage the
relatively soft prism glass, resulting in measurement errors. The refractometer is
maintenance-free. Cleaning should be carried out immediately before and after each
use of the refractometer to maximize its life and optimize measurement results.
• Avoid exposing the refractometer to direct sunlight.
• Never bring the refractometer into contact with solvents.
CALIBRATION PROCEDURE
1. The dioptric oil can attack the cover plate (all plastic and rubber),
please keep it away from the cover plate.
With repeated contact, the dioptric oil can cause cracking and fogging of the
cover plate. When you do the calibration, the calibration stone must be used
and it will act as a cover plate during calibration.
2. Put one drop of dioptric oil on the long-sided surface of the calibration stone.
Open the daylight plate, put the calibration stone (oily side down) on the surface
of the prism and press it lightly with your hand to prevent it from sliding down.
3. Rotate and adjust the calibration screw to make the white and blue boundary
t with the following reference reading: Water 19.6% or 78.8% Brix.
Honey refractometers need special calibration oil and stone.
This refractometer cannot be calibrated by using a standard conguration.
All refractometers are pre-calibrated and therefore there’s usually no need to calibrate it.
ART. 15305210 ART. 15305215
Diesella A/S | Marsvej 20 | DK-6000 Kolding | Tel. +45 7633 8888 | info@diesella.dk | www.diesella.dk
