VWR 635-0722 Guide De L'utilisateur

Digital Hand Held Refractometer
Thank you for purchasing this Digital Hand Held
Unpacking the instrument
Refractometer. In order to ensure that this product
Check that all parts listed below are present and
provides many years of service please follow the
that no transit damage has occurred.
guidance in this document.
Contents list
1 VWR Digital Hand Refractometer (Type A or B)
0-54 Brix
Type A Cat No. 635-0722 2 AAA alkaline battery (LR03)
1.33-1.42 RI
1 User guide
0-95 Brix
Type B Cat No. 635-0723
1.33-1.54 RI
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Instrument overview
Prism dish
Prism surface
LCD display
READ key
Battery
indicator
Scale identifiers
ZERO key
Safety precautions
WARNINGS
Always check the relevant Material Safety Data Sheet for a sample before applying it to the refractometer.
Wear appropriate protective equipment (PPE) when applying samples that may be harmful to the skin or
eyes. Avoid unnecessary contamination of the refractometer by confining samples to the prism dish.
CAUTION
This refractometer is a precision optical instrument and should be handled with care. Do not drop or
subject the instrument to sharp knocks. The instrument housing and display panel areas are constructed
from plastic materials that may suffer damage if contacted with aggressive organic solvents. For example,
avoid contact with solvents such as acetone and certain aromatic solvents.
Maintain your refractometer in a clean condition and avoid use and storage of the instrument outside the
specified temperature range. Avoid dusty and high humidity environments and prolonged exposure to
direct sunlight. Use the soft case provided to protect the instrument. Deterioration/loss of the display may
be indicative of low battery power or low ambient temperature. Do not persist in using the instrument with
low battery power. Check/replace the batteries as necessary.
INTENDED USE
This product is for general laboratory, manufacturing and research use only and is not intended for any
animal or human therapeutic or diagnostic use.
Basic operation
Installing batteries removed during international transit or for long
periods without use.
Remove the battery compartment cover by turning
The battery indicator will show the current
the two retaining screws in an anti-clockwise
state of the batteries. When the indicator
direction. Before inserting the batteries check that
shows empty replace the batteries.
the compartment is clean and dry, and that the
cover seal is in good order. Insert the batteries,
Turning on and off
ensuring that the battery polarity is correct.
Replace the cover by turning the two retaining
Press READ to turn the refractometer on.
screws in a clockwise direction whist the cover is
The instrument will automatically turn off if no
in position.
keys are pressed for 60 seconds. Alternatively
It is recommended that alkaline batteries are used
press and hold READ for 3 seconds to switch the
to reduce the frequency of battery changes. It is
instrument off.
also recommended that the batteries should be
Taking a reading
EN
Before taking a reading clean the prism surface
thoroughly using a suitable solvent, eg water or
methyl alcohol depending on the sample being
measured.
1. Fill the prism dish
2. Press READ – the display will clear
3. A few seconds later the reading will be
displayed
After a measurement has been taken the sample
should be removed and the prism cleaned.
Zero calibration
The zero calibration is essential to ensure
accurate readings. A zero calibration should be
carried out daily.
Use distilled water if possible. Should tap water
be used please be aware that subsequent
measurement accuracy may vary depending upon
the purity of the tap water.
1. Clean and dry the prism
Battery compartment cover
2. Fill the sample dish with water
3. Allow sufficient time for temperature
Model / scale
stabilisation (typically 10 seconds)
identification label
4. Press and HOLD the ZERO key for 4 seconds
5. The display will show "ooo" as the calibration
starts
6. When complete the display will show "000"
Remember to hold the ZERO key for
4 seconds when calibrating with water
Special features
The refractometer has a number of special
features that allow the user to configure and verify
the way the instrument operates.
initions
Def
"-AGt-" Test Mode
"-tSc-" Temperature scale selection mode
Changing the temperature display
The refractometer may be configured to display the
temperature in either Celsius (°C) or
Fahrenheit (°F)
1. Press and HOLD the READ key until OFF is
displayed
2. Quickly release the READ key
3. Press and RELEASE the ZERO key ("-AGt"
will be displayed – see "AG Test Mode")
4. Press ZERO
5. "-tSc-" will be displayed
6. Press READ until the desired temperature
scale is selected
7. Press ZERO to select the displayed
temperature format
Verifying the instrument using a
sucrose solution
The measurement performance of the
refractometer may be verified using a sucrose
solution (weight/weight) of known concentration:
1. Perform a zero calibration
2. Fill the prism dish with the sample
3. Allow sufficient time for temperature stabilisation
(typically 10 seconds)
4. Press READ
5. The refractometer may be considered to be
performing correctly if the reading is equal to
the concentration of the sucrose solution ±0.2
°Brix (or equivalent for non-Brix models)
If the instrument is found to be out of specification,
repeat the test and if necessary contact the
manufacturer for further advice.
Displaying the temperature
Automatic temperature compensation
The refractometer can display the temperature of
Automatic temperature compensation will correct readings of water and sucrose solutions to 20°C. It
the last reading:
conforms to the published ICUMSA 1978 correction tables which covers the ranges 10 to 40°C and 0
1. Quickly press & RELEASE the ZERO key
to 80° Brix and has been extended to cover 5 to 70°C by using additional data. Although the correction
2. The temperature will be displayed in
is specifically applicable to pure sucrose solutions, it is also valid for many sugar based food products.
the configured scale (see "changing the
However, it must be stressed that the correction values may be unsuitable for other non-sugar based
temperature display" in the "Special Features"
products and great care should be exercised with these samples.
section)
3. NOTE: If a reading has not be taken the
Error messages
display will show "--.-°C" (or °F if selected)
In order to achieve the maximum performance from the refractometer, it is essential that care is taken
Changing the measurement scale
when cleaning the instrument and applying sample to the prism. Sample concentration may vary
considerably from the surface to the centre of a mass whether in a beaker or on a spoon or spatula.
The refractometer has two measurement scales
Evaporation will cause the reading to drift unless care is taken.
as indicated on the Certificate of Calibration. The
selected scale will be indicated by an arrow on the
display. To change the scale:
1. Press and HOLD the ZERO key
2. Within 3 seconds PRESS and RELEASE the
READ key to toggle between the scales until
the desired measurement scale is selected
Changing scale requires the ZERO key to
be held. Holding the ZERO key for longer
than specified will cause a zero calibration to be
performed!
Warranty and customer care
VWR International warrants that this product will be free from defects in material and workmanship for
a period of two (2) years from date of delivery. If a defect is present, VWR will, at its option and cost,
repair, replace, or refund the purchase price of this product to the customer, provided it is returned
during the warranty period.
Verifying the instrument using the
This warranty does not apply if the product has been damaged by accident, abuse, misuse, or
"AG Test Mode"
misapplication, or from ordinary wear and tear. If the required maintenance and inspection services are
As an alternative to using a sucrose based
not performed according to the manuals and any local regulations, such warranty turns invalid, except to
solution of limited shelf life, the refractometer
the extent, the defect of the product is not due to such non-performance.
may be verified using a convenient "long-life" AG
Fluid. However, as the AG Fluid is not sucrose
Items being returned must be insured by the customer against possible damage or loss. This warranty
based, it cannot be corrected for temperature
shall be limited to the aforementioned remedies.
using ICUMSA (sucrose) compensation, so the
refractometer incorporates a special "Test Mode"
IT IS EXPRESSLY AGREED THAT THIS WARRANTY WILL BE IN LIEU OF ALL WARRANTIES OF
to facilitate the use of the AG Fluids as follows:
FITNESS AND IN LIEU OF THE WARRANTY OF MERCHANTABILITY.
1. Perform a zero calibration
2. Press and HOLD the READ key until OFF is
displayed
General specification
3. Quickly release the READ key
4. Press and RELEASE the ZERO key "-AGt-" will
Prism and dish
be displayed (This is the "AG Test Mode")
5. Press the READ key ("-AGt-" flashes)
Dish material
6. Fill the prism dish with the AG Fluid
Prism seal
7. Allow sufficient time for temperature stabilisation
Prism material
(typically 10 seconds)
Sample surface
8. Press READ (The instrument will alternate
between the result and "-AGt-" to indicate that it Housing
is in the "Test Mode"
Material
9. The refractometer may be considered to be
IP rating
performing correctly if the reading is equal to the
Relative humidity 95% RH
concentration of the AG Fluid ±0.2 °Brix
10. Turn OFF the instrument to EXIT the Test Mode
Measurement
If the instrument is found to be out of specification,
Range (°Brix / RI) (Type A)
repeat the test and if necessary contact the
manufacturer for further advice.
Resolution (°Brix / RI)
Accuracy (°Brix / RI)
This symbol is an internationally
agreed indicator that the product
bearing it should not be disposed of
as general waste or garbage which
might end up in landfill sites, but
should instead be sent for special
Manufacturer's details
processing and/or recycling in
those countries where appropriate
legislation and facilities are in place.
Manufactured in the UK
This symbol indicates a caution or VWR International, Leuven, Belgium
warning, please refer to the manual.
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Measured sample out of range.
Sample either too low or high or of insufficient volume
Temperature too low or high.
Battery too low
Excessive ambient light (-HAL-) or insufficient sample
(flashes)
No recorded temperature
AG Test Mode is active
(alternates)
Physical
316 stainless steel Length 115 mm
Silicone rubber and Viton Width 54 mm
Optical glass Height 30 mm
8 mm diameter Weight 85g (without batteries fitted)
Temperature
Acrylonitrile Butadiene Styrene Storage
IP65 water resistant Operating
Brix measurement
RI measurement
0-54 / 1.33-1.42
(Type B) 0-95 / 1.33-1.54
0.1 / 0.0001
±0.2 / ±0.0003
-10 to 60°C
5 to 40°C
5 to 60°C
5 to 40°C