Ultrasonic milk analyzer
Milkotronic Ltd
LACTOSCAN LAWS
MILK ANALYZER
Directly controlled by embedded Windows tablet
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Ultrasonic milk analyzer
Switching Adapter
 Voltage supply:
 DC Voltage Source:
95 - 250 V
12 V
Measurement modes










cow milk
sheep milk
UHT milk
goat milk
buffalo milk
cream 25%
cream 45%
whey
recovered milk
other /pasteurized milk/
CAUTION!
Keep the switching adapter dry!
Please, read and follow strictly all the instructions in the manual.
Due to continuous improvement in the device, information contained in this
manual is subject to change without notice. Contact the company-producer
for revisions and corrections
4, Narodni Buditeli Str.
8900 Nova Zagora
BULGARIA
Phone/Fax: + 359 457 67082
e-mail: office@lactoscan.com
www.lactoscan.com
www.milkotronic.com
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SAFETY INSTRUCTIONS
1. Read this manual carefully and make sure that you understand all the
instructions.
2. For safety purposes the device is equipped with grounded power
cable. If there is no grounded electrical outlet where the device will
be used, please, install such before using the device.
3. Place the device on leveled and stable plate. In case it falls or is
severely shocked it may be damaged.
4. Connect to the electrical network in such a way that the power cable
to stay away from the side for accessing the device and not to be
stepped on.
5. Every time before cleaning the device switch it off and unplug it from
the electrical outlet. The device has to remain unplugged till the
cleaning completion.
6. Do not disassemble the unit in order to avoid possible electrical
shock. In case of malfunction contact your local dealer.
7. Handle the liquids the device works with carefully, following all the
instructions for their preparation.
8. Place the switching adaptor in such a way as to be protected from
overflow and spillage of liquids.
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PARTS AND ACCESSORIES
In the table below the standard delivery configuration of the milk analyzer is
listed:
№
Description
Item №
pcs
1.
Ultrasonic portable milk analyzer
WLSS001
1
60 sec
1 sample measurement time
30 sec
WLSS002
2. Operation manual
LSS003
3. Plastic sample holder
LSS004
4. Spare Pipes
5. Alkaline cleaning solution Lactodaily
100 g
6. Acidic cleaning solution Lactoweekly
100 g
In the table below the milk analyzer spares and accessories, which are
delivered on customers request are listed:
№
Description
Item №
pcs
a) included in the set:
b) not included in the set (may be
additionally bought):
7.
RS232 Interface Cable - Analyser-IBM PC
LSS006
8.
9.
10.
pH measuring system
pH probe with cable and holder
Buffer
solution
Ph
60
ml
(pH7.00±0.01/20˚C)
Buffer
solution
pH
60
ml
(pH4.00±0.01/20˚C)
Milk conductivity measuring system
Buffer solution conductivity 50 ml (5.02
(±5%) mS/cm (18±0.1˚C)
RS232 Interface Cable - Milk Analyser –
Serial Printer/IBM PC
High-fat measurement function
Plug type
LSS009
11.
12.
13.
15.
16.
17.
LSS010
LSS011
1
1
1
LSS012
1
LSS013
LSS014
1
1
LSS018
1
LSS020
1
1
1
2
2
1
1
1
18.
Spare O-ring for the pH probe
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Ultrasonic milk analyzer
1. FUNCTION
The function of the milk analyzer is:
- to make quick analysis of milk on fat (FAT), non-fat solids (SNF),
proteins, lactose and water content percentages, temperature (oС),
freezing point, salts, total solids, as well as density of one and the
same sample directly after milking, at collecting and during
processing.
- Total integration of the milk samples measured parameters with
the processes for storing, processing and sending the results
towards the corresponding receiver.
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2. TECHNICAL PARAMETERS
2.1. Working modes characteristics:
The program of the milk analyzer has four working modes.
2.1.1. Measurement mode milk / dairy product – first type
2.1.2. Measurement mode milk / dairy product – second type
2.1.3. Measurement mode milk / dairy product – third type
These modes have been calibrated on customers’ request for 3 milk types
from the following: cow, sheep, UHT, buffalo, goat, camel milk, cream, ice
cream mixtures, whey, recovered milk, etc. before leaving the production
facilities and the text on the display will be for the corresponding types.
2.1.4. Cleaning
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2.2. Measuring range:
Fat ……………….....................
SNF ………………………………
Density ** ……………………….
Proteins ………………………….
Lactose ………………………...
Water content …………………
Temperature of milk ……………
Freezing point***………………
Salts …………………………….
PH*..……………………………...
Conductivity *..…………………
Total Solids* .……………………
* Option, on customers’ request
………………….from 0.01% to 45%*
...…………………....from 3% to 15%
……...…….from 1000 to 1160 kg/m3
……………………….from 2% to 15%
…………………..from 0.01 % to 6 %
……………...……..from 0 % to 70 %
……………………..from 1oC to 40oC
…………………from – 0,4 to – 0,7oC
……………...………from 0,4 to 1,5%
…………………..………from 0 to 14
……………...…from 3 to 14 [mS/cm]
………………………...from 0 to 50 %
** Density data are shown in an abbreviated form. For example 27.3 have to
be understood as 1027.3 kg/m3. To determine the milk density, write down
the result from the display and add 1000.
Example: result 21,20; density = 1000 + 21,20 = 1021,2 kg/m3
The abbreviated form of the density is used also when entering data for
samples in working mode Recalibrate, for example:
If the measured sample density is 1034.5 kg/m3, then in the menu for
entering the samples parameters used for calibration, across the parameter
Den = , you have to enter 34.5.
**** Please, carefully read Appendix Freezing Point.
2.3. Accuracy:
Fat …..……………………………….. …...……………… 0.06-0.08 %
SNF ………………………………….. …………...………….…... 0.15%
Density ……………………………… ……………………….. 0.3 kg/m3
Proteins ……………………………... ……...……………….…... 0.15%
Lactose ……………………………… .…………………………... 0.20%
Water content ………………………. .……………………………. 3.0%
Temperature of milk ……………….. .……………………………… 1oC
Freezing point……………………….. ..……...………………… 0.001oC
Salts ………………………………... …..…………...…………... 0.05%
PH ………………………………….
……………………………±0.05%
Conductivity ……………………….
……………………………...±0.05
Total solids …………………………. …………………………… 0.17%
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The difference between two consequent measurements of one and the same
milk could not exceed the maximum permissible absolute error.
2.4 Correct ambient conditions:
Maximum permissible absolute error is guaranteed in case of normal ambient
conditions:
Air temperature………………………… ….………….from 10oC to 40oC
Relative humidity ……………………… ……………...from 20% to 80%
Power supply ………………………… …………………….....95-250V
Extent of contamination at normal environmental conditions…………..2
Maximum permissible absolute error values in point 2.3 are in dependence
on the correctness of the corresponding chemical method, used for
component content determination. In point 2.3. are used the following
reference methods: Gerber – for fat, gravimetric – for SNF, Kjeldahl – for
protein. The boundary for maximum variation of repeatability when the power
supply voltage is from +10 to – 15% from the nominal voltage values (220 V)
have to be no more than 0.8 accuracy according point 2.3. The analyzer is
used in conditions free of outer electrical and magnetic fields (except the
magnetic field of the Earth) and vibrations.
2.5. Dimensions:
……………………… 250/290/300 mm, mass 4,0 kg
2.6. Continuous working time:
…….…….………………………….…...……....non-stop
2.7 Milk sample volume per one measurement:
………………………………..………..15 cm3 (= 25 ml)
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Fig.1 Total view
pH
probe
(option)
pH
probe
holder
(option)
Thermal
printer
Touch-screen
Waterproof
keypad
Suction unit
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Ultrasonic milk analyzer
3. Qualification of raw milk, thermally treated milk, other dairy
products and derivatives
3.1. Taking samples and preparation for analysis
In order to receive reliable results in qualification of milk, dairy products and
derivatives are needed: precise samples taking; correct samples storing (in
need to be preserved); correct preparation before making measurement. The
rules and requirements for this are described in details in Appendix Preparing
Samples.
3.2. Making the measurement.
3.2.1. Preparing the analyzer for working mode
3.2.1.1. Put the analyzer on the working place, providing good ventilation and
not in the vicinity of heat providing devices or sources. The temperature in the
premises has to be in the boundaries 10-30oC.
3.2.1.2. Switching on the analyser is done with a switch at the rear panel of the
analyser. The tablet, controlling the analyser is powered by its power switch.
Wait for Windows to be loaded. The operator has an access to all the resources
of the system, where can be set, if necessary - printer (for example standard А4
printer), WiFi or connection to other peripheral devices (for example mouse and
keypad, flash memory etc.). There’s an USB Hub, which ports are mounted on
the back panel of the analyser. These are standard USB ports, connected to the
tablet (controlling computer).
There are 2 ways of control of the tablet/software:
А. By direct touch on the buttons on the display (using the possibility of the
touch screen of the tablet) and buttons on the front panel (if the version is with
such buttons);
or
B. With the mouse and/or the keyboard, working like a standard computer.
Version A is suitable for daily work for measuring and cleaning the
analyser, while version B is recommended for setting and servicing.
The software can be started directly after Windows has been loaded or by
pressing an icon, in dependence of the custom’s requirement. After the software
is loaded, the main menu appears on the display:
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Description of the main screen:
Position 1. System menu – the upper one on the display. It is described
with the file Supplier Tools LS-Menu Help. Serves for direct control of the
settings/test/service mode of the analyser.
Position 2. System Status – includes groups Supplier, Liters and
information tab, imitating the display of the standard (analyser without a tablet)
Lactoscan (upper right corner). Serves for entering the ID of the deliverer, liters/
kgs which were delivered and shows the current information, describing the
exacution of the specific commands sent from the tablet towards the PCB of the
analyser.
Position 3. Tab for measurement results – Fat=00.00, SNF=…
Information tab and could not be changed by the operator. It serves for
displaying the measurement results. The last measurement results stay active
till the next measurement is started.
Position 4. Control buttons. The buttons at both ends are with fixed
names – Print and Clean – for starting the corresponding commands. The rest 3
are with changeable names, because they show the name of the corresponding
calibration (type of milk). By pressing them, a measurement on the chosen
calibration is started. If the analyser is with outer keyboard, mounted in the box
of the device (a number of buttons with the corresponding designations), by
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pressing the buttons left/right is moving the choice of the calibration. Using this
keyboard, the chosen calibartion is started by pressing the button Enter.
Position 5. Archive tab, type List Box at the lower part of the display. It
shows the last 10 measurement results. The meaning of the results is described
in the list over them.
Position 6.Information line. It is at the bottom of the display. The group
Save File shows the name of the file, where the results will be saved. It is
generated automatically, based on the current date. If needed, it ca be changed.
The group Meas Count – shows the number of the measurements already done.
At the right of this line is displayed the version of the PCB (Main PCB – on which
the measurement system is based) and software in it.
3.2.2. Working with the analyser in measurement mode.
This is the main working mode. It is needed a milk to be poured in the
glass, to place it in the recess of the analyser, to choose the needed calibration
and start it. The sample is sucked, display is changed as follows:
The calibration used at the moment remains on the display. The previous
results are hidden. First appears the temperature of the sample. A clock/timer
appears in the middle of the display, showing in seconds the remaining time till
the appearance of the measurement results. After measurement completion, the
results appear in the tab for the measurement results as well as in the archive
tab i.e. the initial start display with valid results appears. The results are archived
to a text file and can be used for later result analysis. If there is a internet
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connection(e.g. WiFi, 3G modem, etc.) the results can be send to a cloud,
where they can be stored or further analysed
If there’s serial printer connected (loaded with paper, with closed cover), the
results are printed out. The analyser is ready for the next command (it is in Idle
mode) i.e. ready for the next measurement. Button Print is active – by pressing it
a copy of the results can be printed out (it is advisable one printout to remain in
the milk collecting center, while the second one to be given to the deliverer).
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4. CLEANING THE ANALYZER
This procedure prevents gathering milk fat residues and milk stone on the
sensor. The milk stone consists of milk solids, calcium, iron, sulphates,
magnesium, etc. All these substances form layer on the pipe and sensor’s
walls, which leads to deviations in the measurement results and blocking up
the piping.
The company-producer recommends usage of the chemicals, supplied with
the analyser – alkaline and acidic (Lactodaily and Lactoweekly). You may
order them separately or together with the analyser. Try to use only these
chemicals for cleaning the analyser.
In case you missed to order these chemicals, the alternative is to use alkaline
and acidic cleaning solutions for dairy equipment by one the companies,
producing such chemicals, as for example:
http://www.diversey.com
http://www.ecolab.com
http://www.calvatis.com
Do not use chemicals not intended for usage in the milking systems or
vessels in the dairy sector. Pay special attention to the concentration of the
acidic chemical. Increased concentration may damage the measuring
sensor.
4.1. Periodically cleaning (rinsing) the analyzer
It is done in the process of routine work of the analyzer. Its aim is to prevent
drying up and adhesion of different milk components in the milk analyzer’s
measuring system.
4.1.1. Periodical cleaning frequency.
It is easy to understand what is the period on which the rinsing could be done
as the analyzer reminds you when it is necessary. This is done by a sound
signal in 1-second cycle after the set time intervals elapse:
 55 min. after switching on the power supply of the analyser, but idle
work;
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 15 min. after the last measurement of real milk sample.
*Idle Mode is that part of the standard working mode, when the analyser is not making
measurements. There’s embedded in the analyser system for measurement of the idle
time. The idle time is measured starting from the last action of the operator. In
dependence of it (what the operator last did), are taken decisions regarding the cleaning.
There are 2 options:
Option A: If the analyser:
1. Was only switched on but was not started in measurement mode,
2. Or the last action was cleaning,
3. Or the last action was measuring sample with very low Fat (similar to water)
Then the signal for cleaning is started after 55 min.
Option B: If the last thing done with the analyser was measurement of normal milk sample,
the signal for cleaning is started after 15 min.
After cleaning completion, new measurement takes place in above described
time intervals.
4.1.2. Making the rinsing
After above message is received put in the recess of the analyzer a sample
holder with alkaline cleaning solution or water.
Press Clean to start the rinsing mode.
In this mode the analyzer makes 8 cycles and stops.
Already used solution is poured out of the analyser. Now the device is ready for
the next measurement. In case of doubt that the analyzer is still not well
cleaned, the procedure Cleaning may be executed repeatedly.
4.2. Complete cleaning
4.2.1. Complete cleaning frequency
This cleaning is done after finishing the work with the analyzer at the end of
the working day or if it is obvious that the measuring system of the analyzer is
contaminated in case of intensive work with it. It is done with alkaline cleaning
solution.
Preparation of 3 % alkaline solution of Lactodaily for circulation cleaning in
the milk analyzer:
1. Take the package 100 g concentrated chemical Lactodaily
2. In appropriate vessel (for example bucket) pour 1 l water.
3. Add the powder and then again water up to 3 l.
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For a single cleaning cycle you need only 25 ml cleaning solution. We
recommend you to prepare working solutions of cleaning chemicals, enough
for normal work for 1 week, because, during their stay unused, the working
solutions loose their strength and also is difficult to store them.
Then follow the instruction for milk analyzer cleaning.
4.2.2. Cleaning
4.2.2.1.Rinsing milk residues
Fill in the glass with water. Put it in the recess of the analyser and start
command Cleaning from the main menu. After finishing it pour out the
contaminated water.
4.2.2.2.Cleaning with alkaline cleaning solution
Fill in the glass with warm (50-60 С) alkaline cleaning solution. Put it in the
recess of the analyser and start the command Clean. After finishing it, pour
out the contaminated liquid.
4.2.2.3.Rinsing with water
Fill in the glass with water. Put it in the recess of the analyser and start
command Clean. After finishing it pour out the contaminated water. Now the
device is ready for work.
4.2.2.4. Cleaning with acidic solution
It is recommended to be done every day.
Preparation of 3 % acidic solution of Lactoweekly for circulation cleaning in
the milk analyzer:
1. Take the package 100 g concentrated chemical Lactodaily
2. In appropriate vessel (for example bucket) pour 1 l water.
3. Add the chemical and then again water up to 3 l.
Fig. 3 Labels for the cleaning chemicals
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The following procedure is executed:
1. Rinsing the milk residues:
Fill in the glass with water. Put it in the recess of the analyser and start
command Clean. After finishing it pour out the contaminated water.
2. Cleaning with acidic solution
Fill in the glass with warm (50-60 С) acidic cleaning solution. Put it in the
recess of the analyser and start the command Clean. After finishing it, pour
out the contaminated liquid.
3. Rinsing with water
Fill in the glass with water. Put it in the recess of the analyser and start
command Clean. After finishing it pour out the contaminated water. Now the
device is ready for work.
Please, pay attention that, when the analysers gives a signal for need of
cleaning 15 min after the last measurement of real milk samples or 55 min.
after being powered and not used, cleaning is made ONLY with alkaline
solution in concentration 1-3%.
During the basic/final cleaning consequence is: alkaline solution – water –
acidic solution - water
IMPORTANT
THE MAIN REASON FOR MALFUNCTIONING OF THE
DEVICE IS THE BAD CLEANING OF THE SYSTEM AFTER
MAKING ANALYSIS.
In case of malfunction due to the bad cleaning of the
analyser your guarantee is not valid anymore and any
repair has to be paid.
By pressing the button Clean, a cleaning procedure is started.
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Ultrasonic milk analyzer
After the cleaning cycles are finished, the analyser returns “Lactoscan Cleaned” message
and “Ready to start”
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5. Menus’ description.
These functions are NOT for everyday use. They are used in case
some parameters of the analyser to be changed, after careful acquaintance
with these commands and how to use them
Service mode menus are selected from the main menu system at the
top of the screen. For easier work with the service menu we recommend
using a mouse and a keyboard. Structure of the menu system:
File
System Setup
Purpose: To select the communication ports. Used in production
conditions, or if necessary in the service conditions
Reset System
Purpose: To reset the hardware of the device - the specialized board. It
is equal to switching the power Off / On.
Exit
Purpose: Exit from the software, controlling the analyser and returning
to windows desktop. It is used in cases when the tablet needs settings to be
made- for example connecting to a WiFi network, connecting an external
printer, etc.
ShutDown
Purpose: Exitfrom the software and shutting down the tablet. It is used
to turn off the system. After pressing shutdown, turn off the pcb using the
switch on the back panel.
Supplier
Add Supplier
Purpose: To enter the details of a new supplier of milk. It is used in
case of building or using a report system.
Edit Supplier
Purpose: To edit / change data for already introduced suppliers of milk.
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Ultrasonic milk analyzer
Tools
LSCal
Purpose: To start an external software tool, used for the calibration of
the device. The way of work with the tool LSCal.exe is described separately
in the service documentation. After completion of the calibration, to resume
work with the program press the button "Finish".
Calibration
The program LSCal.exe is used to calibrate Lactoscan Milk Analyzers- WLS
Version. Two samples are used – with high and low fat, the third
measurement group is measurement with water. Measurements are taken in
the following order: high fat sample, low fat sample, water.
Note:
Before starting the calibration procedure, the operator has to be
acquainted with the analyzer’s manual, mainly in its part preparation of
samples, described in service manuals.
Program control:
After the program is started the display shows the following:
Radio button:
COM Port
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1
2
3
4
– COM 1 connection
– COM 2 connection
– COM 3 connection
– COM 4 connection
Calibration
1
– Calibration cal 1
2
– Calibration cal 2
5
– Calibration cal 3
Control buttons:
Start
- Starts the communication, this means the device is
ready for work
Measure
starts a measurement in Calibration mode.
Download - saving the new calibration in the device
Edit boxes:
Group Calibration sample – parameter values
sample parameters values for each parameter at a time.
-
set
the
Colomns N1, N2, Temp
- the results of the measurements in
calibration mode, used for making the calculations of the new calibration.
Workflow
This program receives the control from the main program by selecting
the Tools menu and choose LSCal.
It opens the software tool for calibration. The operator chooses the Com
Port, and presses the button Start. After that inputs the parameter values in
the fields. With the button Measure starts a new measurement of the sample
in calibration mode.
Details of the calibration process are described in the service
documentation.
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After finishing the calibration, close the LSCal program and press button
Finish of the main program to return to normal use of the analyser.
LS-Menu
Special Modes
Cycle
Purpose: Starts the unit in cyclic measurement of the ultrasound.
The results appear in the results field, in place of Fat, SNF ... The results are
remembered in a file. The mode is used for industrial purposes or for service
work by qualified professionals. This type of measurement is not used in
everyday laboratory work.
Correction
Temperature Correction
Purpose: To correct the measured sample temperature. Used by
trained service specialists. The measured temperature can be varied within +
- 9.9 degrees.
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Correction
All Corrections
Purpose: Provides information about all existing corrections of the
system parameters. The window is informative, for editing adjustments
proceed to the selection of calibration and selection of parameters to be
adjusted (see below)
Corrections
Calibration
Parameter:
Purpose: The menus are used for selecting which
parameter of which calibration will be corrected.
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Settings
Set Calibration Names
Purpose: To edit the names of the calibrations. The operator can
introduce a free string of 8 alphanumeric characters. After starting, the screen
displays the following, the operator must follow the instructions of the
program:
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Using the keyboard, the operator inputs the names of calibrations.
Memorize them by pressing the Set button or refuse corrections by pressing
button Cancel.
Save Calibration
Purpose: To save the calibration to a file in the computer. Select the
calibration to be saved
Restore Calibration
Purpose: Restore an already saved to the tablet calibration
*Note: Each calibration is specific to the analyser. You can save a
calibration and restore it only to the same machine
Autoprint Enable/Disable
Purpose: To select whether the device will automatically print the
results after finishing the measurement
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Format Results:
Purpose: To select the format of the results – main or large. The device
comes with factory settings for Large results. The machine should be set for
operating with Large Results
High Fat Control
Purpose: To enable/ disable high fat measurement for a specific
calibration for machines with High Fat Option. When selected from the menu,
choose a calibration:
High Fat Speed For Calibration
Purpose: For machines with High Fat Option. Turn on High Fat speed
for calibration, before attempting a calibration with high fat samples
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Tests
Test Pump
Purpose: To test of the pump unit. Used in service
conditions by qualified specialists. To end the test press the button "Finish".
Ultrasound
Purpose: To set the measuring system of the device. Used
in service conditions by qualified specialists. The procedure is similar to that
used in standard devices without integrated tablet. Current messages are
displayed in the field System Status (top left corner of the display)
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To finish the procedure, press the button “Finish”.
Set Amplitude
Purpose: To set the metering system of the device. Used in
service conditions by qualified specialists. The procedure is similar to that
used in standard devices without integrated tablet. Current messages are
displayed in the field System Status (top left corner of the display). When the
procedure is finished apparatus brings a message that the amplitude is found
and asks the user to set this amplitude or cancel the procedure
Cleaning
Starts cleaning of the analyser. It is equal to pressing the
button Clean from the main menu.
pH & Co Meter
pH Meter En/Dis
Purpose: To turn on / off pH measurement in the process of
measuring other parameters. It is available for devices with manufactured
hardware option pH.
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pH Test
Purpose: To set a pH measurement system of the device (if
the device is manufactured with an optional pH). Used in service conditions
by qualified specialists.
pH Measure
Purpose: For off-line measurement of pH. In this case the
analyser works only as pH meter, without measuring other parameters of the
sample.
pH Meter Calibration
Purpose: To calibrate the system for measuring the pH.
After starting, the screen displays the following, the operator must follow the
instructions of the program:
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The operator inputs the values of the buffers used for calibration.
Selection of buffers and principles of work with the pH meter are described in
the document WLS-TechManual. By pressing the Set button to go to the
actual calibration. Reports of this process is displayed in the System Status,
in the upper right corner of the screen. By pressing the Cancel button
procedure is terminated and transferred to the main screen.
Co Meter En/Dis
Purpose: To turn on / off the conductivity measurement in
the process of measuring other parameters. It is available for devices with
manufactured hardware option conductivity.
Co Meter Test
Purpose: To set up the measuring system to the
conductivity of the device (if the device is manufactured with an option
conductivity). Used in service conditions by qualified specialists.
Co Meter Calibration
Purpose: To calibrate the system for measuring
conductivity. After starting, the screen displays the following, the operator
must follow the instructions of the program:
The operator enters the values of the buffer that will be used for
calibration. Selection of buffer and principles of working with the system for
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Ultrasonic milk analyzer
measuring conductivity are described in the document WLS-TechManual.
Pressing the Enter key passes to the actual calibration of the measurement
system. Reports of this process is displayed in the System Status, in the
upper right corner of the screen. By pressing the Cancel button procedure is
terminated and transferred to the main screen.
5 Sample calibration
Purpose: To make a precise calibration of the Conductivity Meter. For
the calibration are used 5 conductivity buffers
The procedure is as follows:
- Enter first sample value
- Put a Sample and press start
- Repeat the same steps for the rest of the buffers.
For each sample five measurements are made.
Pump Control
Purpose: The following menus are used for test of the pump unit.
Used in service conditions by qualified specialists.
Pump In
Pump Out
Stop
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Ultrasonic milk analyzer
Measurement
Discard Last measurement
Purpose: Discard the last measurement from the daily report
Help
LS Identity
Purpose: Displays information about the hardware of the device serial number version of the program board.
About
Purpose: Displays information about the program in the tablet
control hardware appliance.
Admin Mode
Purpose: Enter admin password for enabling admin menu. For receiving your
admin password please contact your Milkotronic representative
Admin Mode
Restore Factory Settings
Purpose: Return the machine in the state of which it was produced.
NOTE! This procedure will erase all user data such as calibration corrections,
new calibrations and will restore the machine to the state in which it was
received from Milkotronic.
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6. Peristaltic pump service
Fig.6 Peristaltic pump
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Ultrasonic milk analyzer
7.
POSSIBLE MALFUNCTIONS AND ERROR MESSAGES,
TROUBLESHOOTING
In the table below are described the possible malfunctions during the milk
analyzer’s exploitation and ways for their repair/remedy. If the problem
persists after all recommended measures are taken, please, connect the
nearest service center for help. Do not forget to tell the analyser’s identity.
To receive the analyzer’s identity, refer to point 3.2.1.3.
Error
message
2 MA
overheated
Accompanied
by a
continuous
sound signal
3 Empty
Camera
Operation Manual
Possible
problem
/cause
Overheated
milk
analyzer
Insufficient
quantity of
the milk
sample
sucked in
the system
or air in the
sample
28.10.16
Repair/remedy
Immediately switch off the analyzer.
Pay attention the analyzer to be situated
away from direct sunlight or heating devices.
Wait 5-10 minutes the device to cool down or
to be normalized the ambient temperature
and switch it on again.
The analyzer is ready to measure the next
sample. In order to avoid the future
appearance of the same error message,
please, check the following:
- The sample is prepared according the
instructions and there aren’t air bubbles
in it.
- There is a real suction of the sample
after starting measurement, i.e. it is
obvious that the level of the milk sample
in the sample holder decreases. In other
case – there is damage in the suction
system.
- Avoid the end of the suction pipe to be
above the surface of the liquid (not
dipped enough).
- Avoid curdling of the milk sample. Clean
immediately if there is a sample curdled
in the system.
- In mode Measurement, after starting the
measurement, remove the sample
holder and see if there is no milk poured
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Ultrasonic milk analyzer
4 Sample
Overheat
Operation Manual
Sucked
overheated
sample
28.10.16
back in the sample holder.
The analyzer is ready to measure the next
sample. In order to avoid the future
appearance of the same error message,
please, check the following:
-The sample is prepared according the
instructions and its temperature does not
exceed the maximum permissible sample’s
temperature.
-Complete the procedure for checking the
analyzer in case of error message Empty
Camera.
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8. MAKING CORRECTIONS AND RECALLIBRATION OF THE DEVICE
In the process of work with the analyser there is a possibility the results to
start differing between the data for some of the measuring parameters when
measured with the milk analyzer and the corresponding reference method of
analysis (Gerber for fat, Kjeldhal for proteins etc). In order to establish the
possible discrepancy and to correct the readings of the milk analyser do the
following:
8.1. Taking samples and preparation of samples for checking the
accurracy of the milk analyser, making corrections and
recalibration
This is a basic moment for the correct checking the accuracy of the analyser
and for making correct and precise correction and calibration. It is
accomplished according Appendix Sampling and preparation of samples for
verification the accuracy of the milk analyzer, making corrections and
recalibration.
8.2. Determination the type of the discrepancy:
8.2.1. Making measurements
Make measurements with different samples (not less than 3) with known
values of a separate parameter (for example fat content), determined by the
known reference methods of analysis (for example Gerber's method for
determination of fat content). For more accuracy it is recommended among
these samples to be also such with values, close to the lowest and highest
bounds for the measured parameters.
Make 5-time measurement for each of the samples. Calculate the average
value for each sample parameter, without taking into consideration the first
measurement for each sample.
8.2.2. Analysing the measurement results
Make comparison between the values of the parameter from the reference
sample and measured with the analyser. Make analysis of the difference
received.
8.2.2.1. If the received differences are relatively constant value for samples
with different content of the analysed parameter, it is necessary to make
correction.
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Ultrasonic milk analyzer
For example
М% of the reference samples:
М%average when measuring
with the analyser:
Difference:
2,20
3,00
3,80
4,60
5,20
2,38
0,18
3,17
0,17
4,01
0,21
4,79
0,19
5,42
0,22
Conclusion: the difference is relatively constant value and correction is
possible to be done with – 0,2 % (see Corrections, p6.3.3)
8.2.2.2. If the differences are not a constant value it is necessary recalibration
to be done.
For example.
М% of the reference samples:
М% when measured with the
analyser:
Difference:
Conclusion: It is obvious that
recalibration have to be done.
2,20
3,00
3,80
4,60
5,20
2,02 2,93 3,76 4,75 5,44
-0,18 -0,07 -0,04 0,15 0,24
the difference is variable value and
8.3. Making corrections
8.3.1. Possible corrections, limits and changing steps
Every parameter from each calibration may be separately corrected. Below is
the table with possible corrections, limits and changing steps:
Parameter
FAT
SNF
Density
Lactose
Salts
Proteins
Added water
Sample’s temperature
Increasing
0.95%
4.75%
4.75%
0.95%
0.95%
0.95%
9.00%
9.90oС
Decreasing
0.95%
4.75%
4.75%
0.95%
0.95%
0.95%
9.00%
9.90oС
Step
0.01%
0.05%
0.05%
0.01%
0.01%
0.01%
1.00%
0.1oС
Corrections are described in a dedicated software tool.
8.3.3.4. Making verification
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Ultrasonic milk analyzer
After the corrections are made put the milk analyser in working mode and
make several times measurement of reference samples with known values of
the corrected parameter. If the difference between the values of the
parameter from the reference methods and milkanalyser are in the limits for
the parameter it may be considered that the correction is successfully made.
If the discrepancy between the measurements from the milk analyser and
classical methods is bigger than is necessary to make second correction
according above described way.
If after the second correction the results are unsatisfactory we recommend
making a calibration of the analyser.
When making corrections or calibrations be 100% sure in the accuracy of the
reference methods result.
9.Basic printer characteristics
Paper Working
Loading way
Cutting way
Print method
Printer
performance
Drawing/Bar
code
Testing Method
Control System
Printing density
Printing width
Max Printer Speed
dot distance
word
size(WⅹH
mm)
ASCⅡ Character(
WⅹH dots)
ASCⅡ Size(WⅹH
mm)
drawing/bar code
lacking paper testing
printer interface
buffer
Command System
Woking Voltage
Power
Printer
Operation Manual
Average electricity
Max electricity
printing head lifespan
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easy
divulsion(dentiform)
Direct thermal print and auto paper
feed
384 dots/line
8 dots/mm
48 mm
85 mm/s(max.)
0.125 mm
0.75×1
16 lattice:8×16; 24 lattice:12×24
16 lattice:2×4; 24 lattice:1.5×3
suitable
photoelectricity sensor
TTL/RS232
32k
ESC printer command/WH printing
command
DC3.5V--9V (from7.2-5v,with highest
speeed and excellent effect)
less than 1.5A
less than 3A
50km
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Ultrasonic milk analyzer
Mechanism
Paper
paper item
paper width
papaer thickness
diameter of paper roll
Environment
adaptability
Physics
Specification
Storage temperature
Dimension (WⅹHⅹ
D mm)
thermal paper
58mm
65±5um
30mm
0~55℃;-20~55℃
10~90%RH
–25~70℃
10~90%RH
103mm×57mm×57mm
Fig. 7 Printer control panel
3
1
4
2
1.
2.
3.
4.
Printout
Paper roll compartment
Printout button
Cover opening button
Changing the roll
To change the paper rolls proceed as follows:
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Ultrasonic milk analyzer
1. Press the button as it is shown on the figure.
2. Position the paper roll making sure it unrolls in the proper direction.
3. Tear off the paper and close the cover
Consequence of actions when printing
The embedded printer is automatically switched on with switching on the
device. After finishing the measuring procedure the results are automatically
printed out. If there is a need of repeated printing of the same results the
operator has to press the button Print on Main Display (each pressing the
button Print - the results will be printed out). If you do not need to print out the
results after the measurement is completed, just open the lid of the printer.
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Ultrasonic milk analyzer
10. ADDITIONAL POSSIBILITIES OF THE ANALYSER
10.1. Connecting to 12 V DC power supply.
If there is a need the analyser to work on place without electrical supply
available, then it could be powered by car battery or other 12 V DC external
power supply. Use the 12 V power supply cable (art. number 30030).
10.2. Measuring high fat samples (option).
The standard device measures samples up to 25% fat.
On customer’s request, the device could be produced with possibility to
measure samples up to 45% fat. The customer can choose which calibration
to have this possibility and which not, as well as during the process of
exploitation to change the measuring mode i.e. to pass from measuring
normal fat percentage towards high and vice versa.
What the operator sees during these passes is the difference in the speed of
sucking the sample. For that purpose, the high-fat sample has to be
preliminary heated up to 30С +- 3С.
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Ultrasonic milk analyzer
Appendices
APPENDIX
1:
PREPARATION
MILKANALYSERS’ CALIBRATION
OF
SAMPLES
FOR
For calibration are needed samples of cow milk with the following
parameters:
Low Fat
2,2%
1 Cow
High Fat
5,2%
Middle
3,6%
For the calibration are needed:
1. Distilled water
2. Min. 3 milk samples with known values for fat, SNF, protein, density,
lactose, salts.
Calibration samples have to be with low, middle and high values of the
analyzed components. Samples have to be representative for given milk type.
Volume of the sample has to be enough for making min 5 measurements for
each sample – not less than 1,00 l. Changes in the analyzed parameters in
the samples have, if possible, to cover the whole measuring range – i.e. used
samples to be with low, middle and high content of the analyzed components.
Methods of milk samples preparation for calibration.
For milk sample with middle value of the analysed components we
recommend to use milk taken from not less than 10 animals from most
common in the region breed.
Sample with low and high value are prepared on the following way:
1. Pour the fresh milk with FAT at about 3.7% in a separating funnel.
2. Leave the funnel with the milk in refrigerator for 12 hours at temperature
+5-+8 ° C.
3. Draw the substratum of the separated milk in a vessel, mix it well, pour
it and heat it in water-bath up to 20°C.
4. Pour the upper layer in another vessel.
5. Determine the concentration of the measured components (FAT,
protein, SNF, density, lactose, solids) by using certified methods.
The analyser’s accuracy depends only on the correctness of the chemical
analysis of the components in the samples and the normal acidity during
calibration!
It is recommended the first cow milk sample with low fat content to be with
the following parameters:
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Ultrasonic milk analyzer
2-2,3% FAT; 8.7-9% SNF; 3,3-3,5 % Protein; 4,8-4,9% Lactose; 0,75 Salts;
1030-1033 kg/m3 Density.
The second cow milk sample with high fat content to be with the following
parameters:
5-5,3% FAT; 8.4-8,79% SNF; 3,1-3,2% Protein; 4,6-4,7% Lactose; 0,7 Salts;
1028-1029 kg/m3 Density.
If, after milk’s separation you do not obtain samples in the requested range,
then, by adding milk with high fat value into the low fat milk sample you can
obtain necessary value-2,3%
Analogous to this, by adding low fat milk sample into a milk sample with high
fat value you may receive 5,3%
Samples with medium values are received by mixing low fat and high fat
samples in necessary proportion.
If there is a need of longer sample storing they have to be preserved; the
most commonly used preservative is potassium dichromate (K2Cr2O7) - 1 g
for 1 000 ml.
When using samples, stored shortly, preliminary pour the sample from one
vessel to another in order to distribute the milk components evenly paying
attention not to form foam in the sample.
When the samples are stored for a longer period it is recommended to warm
it up to 35-45 °С, and the vessel to be shaken carefully. In case that there is a
cream stuck on the vessel’s surfaces – remove it. The sample is poured from
vessel to vessel several times and is cooled down (advisable to 20 °С /.
If there is separated liquefied fat or white particles with irregular form on the
vessel’s walls reliable results could not be received.
Because it is very difficult both lactose and salts to be measured but they are
substantial and influence in great extend when determine added water. That’s
why it is better both lactose and salts to be calculated by using SNF results.
The milk must be for sure without added water.
If you are unable to make the analysis of milk in certified methods in a pinch
you can use the following formulas:
DETERMINATION OF THE BASIC PARAMETERS IN THE MILK SAMPLE
BY USING FORMULAS IS NOT AS PRECISE AS USING THE ARBITRARY
METHODS, BUT IS SUITABLE FOR USAGE IN FIELD WORK.
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Ultrasonic milk analyzer
1. Determination some of the parameters by formulas
There is dependence between the different parameters in milk and its
density, which may be expressed with mathematical equation. On this base
different formula, tested and confirmed by the classical laboratory methods
for analysis, are developed. We recommend the following:
2. SNF determination.
For determination of SNF the correlation dependence exists between the
milk’s density, fat and SNF in the milk. When the density and the fat are
known, the SNF can be calculated.
There are several formulas with different applicability.
А/ When the salts and fat are known
SNF is calculated by subtracting the fat percentage from the salts.
SNF = Salts – F (%)
Where
Salts – salts in (%),
F
– fat content in (%),
This formula is used for determination of SNF in whey, buttermilk, and cream.
B/ Known quantity of fat and density (most commonly used method when
maximum accuracy is needed).
We recommend the following formula:
SNF 
0,075  F %  100  100 / density
0,378
This is a universal formula and actual for milk of almost all kind of cows and
sheep all over the world.
3. Determination of lactose content
We recommend the following formulas:
А/ for cow milk
Lact. = SNF * 0,55 (% )
Where
SNF
– content of SNF in percentages (%),
0,55
– constant coefficient.
B/ for sheep milk
Lact. = SNF* 0,45 (% )
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Ultrasonic milk analyzer
Where
SNF
0,45
–solids-non-fat content in percentages (%),
– constant coefficient.
This is an actual coefficient for sheep breeds on the territory of the Balkan
Peninsula.
4. Determination of salts content
We recommend using the following formulas:
А/ for cow milk
Salts = SNF* 0,083 (% )
Where
SNF
0,083
– solids-non-fat content in percentages (%),
– constant coefficient.
B/ for sheep milk
Salts = SNF * 0,075 (% )
Where
SNF
0,075
– solids-non-fat content n percentages (%),
– constant coefficient.
This is an actual coefficient for sheep breeds on the territory of the Balkan
Peninsula.
5. Determination of total proteins content
We recommend using the following formulas:
А/ for cow milk
Protein = SNF * 0,367 (% )
Where
SNF
0,367
- solids-non-fat content in percentages (%),
– constant coefficient.
B/ for sheep milk
Protein = SNF * 0,475 (% )
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Ultrasonic milk analyzer
Where
SNF
0,475
– solids-non-fat content in percentages (%),
- constant coefficient.
This is an actual coefficient for sheep breeds on the territory of the Balkan
Peninsula.
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Ultrasonic milk analyzer
APPENDIX 2 FREEZING POINT DETERMINATION
1. Methods for determination.
The milk analyzer determines the freezing point of each sample and the
quantity of added water. The milk analyser does not measure the freezing
point, but calculates it from the components it depends on. The basic
components in the milk are water, solids, lactose, FAT, proteins, minerals
(salts) and acids. The freezing point depends only on the diluted in the milk
components and quantity of the solvent (in the milk it is water). The ultrasonic
technology allows direct measurement of FAT, proteins, lactose + salts (the
soluble components, only influencing the freezing point), and the quantity of
the solvent in % is determined by 100 % – total solids %, total solids = lactose
% + FAT % + proteins % + salts % + acids %.
Without understanding the meaning of the freezing point – determined or
shown from the milk analyzer added water result easily may lead to a mistake
for the value of this parameter.
2. The basic freezing point.
Milk freezes at lower temperature than water. The average freezing point of
the raw milk in the most regions is at about -0,540С. The average reading
for your region is called “basic” freezing point.
The freezing point of milk is a “physiological constant”. This does not mean
that it will not vary. In fact feed, breed, season, time of lactation, climate,
whether the sample is taken at the beginning, middle or end of lactation – all
these factors will have an effect on the freezing point of the individual sample.
This means that there is an average value of all these numbers. The more
samples used in obtaining this average, the more reliable it is as a base. Or
the basic freezing point is an average of freezing points of milk, taken from
many cows. When a laboratory checks a producer, it is only comparing the
average of the producer’s cows against a larger area average.
The Health authorities establish the basic freezing point or agriculture
departments in some regions, sometimes by universities, separate dairy
producers, or their associations. Frequently, tolerances have been
established on top of a basic freezing point to allow some variations in the
milk as well as device or operator variations.
Without mentioning the basic freezing point, the Association of Official
Analytical Chemists now recommends an upper limit freezing point at 0,525C (2,326 standard deviations above the most recently determined
North American average of –0,5404C), below which there will be at 95%
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Ultrasonic milk analyzer
confidence that will show 99% of all freezing point determinations on
unwatered milk:
“if the freezing point is –0,525C or below, milk may be presumed to be free
of water or may be confirmed as water free by tests, specified below. If the
freezing point is above –0,525C, milk will be designated as “presumptive
added water” and will be confirmed as added water or added water free by
tests specified below. Evaluate extreme daily fluctuations in the freezing point
of herd, pooled herd, or processed milk for presence of added water”.
“Presumed added water”, as described above, must be “confirmed” by means
of tests on authentic milk samples obtained as specified in the АОАС
METHODS.
After determination the freezing point of your sample via the milk analyzer,
the added water is calculated using the following formula:
AddedWater 
FrPo int Base  FrPo int Calc
 100[%]
FrPo int Base
Where:
FrPointBase is the basic freezing point
FrPointCalc is measured freezing point
Note:
If the freezing point is not correctly determined, the result for the added water
is not valid. In this case results for FrPoint and AddWater are not shown on
the display and on the printout from the printer. If the density of the measured
sample is 0, the result for AddWater is not valid and is also not shown on the
display and the printouts.
Sample:
First variant
If you’ve entered for milk analyzer basic freezing point -0.520C (according
article 5.9 of the EU Milk Hygiene Directive 92/46/ЕЕС), measured freezing
point –0.540C, using the above pointed formula you’ll receive –3,8%.
Because it is not possible the added water to be negative value, the milk
analyzer indicates 0% added water. The reason for this is the tolerance in the
basic freezing point, reasons for which are described below.
If in the same milk we add 3,8% water, and the basic freezing point is the
same, the milk analyzer will measure freezing point –0.520C, and will
indicate again 0% added water.
Second variant
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Ultrasonic milk analyzer
If you’ve entered for the device basic freezing point –0.540C, measured
freezing point –0.540C, the milk analyzer will indicate 0%. When you add
3,8% water, the device will indicate 3,8%-added water.
From the above mentioned follows that it is very important to enter correct
basic freezing point in the device.
The device’s results for added water may give information about doubt of
added water in the milk and the exact value of this added water may be
determined after a “cowshed sample” is taken and the result for the freezing
point, measured by the milk analyzer of the “cowshed sample” is entered as
basic freezing point in the formula for calculation of added water.
Then the result from this formula will give us the absolute value of the added
water for the corresponding milk supplier.
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Ultrasonic milk analyzer
APPENDIX 3 PH MEASURING
1. General information
PH probe is a unit, measuring the solution acidity or alkalinity degree. It is
measured on scale of 0 to 14. The term pH is derived from "p", the
mathematical symbol for the negative logarithm, and "H", the chemical
symbol of Hydrogen. The formal definition of pH is the negative logarithm of
the Hydrogen ion activity.
2. pH Electrode
For pH measurement the milk analyzer needs a combination electrode,
compatible with most pH electrodes that have BNC connectors and zero
potential (the pH where the mill volt output of the electrode equals 0) near 7
pH.
2.1. Electrode part
The electrode is the most important part of the pH measurement. The
electrode glass membrane is fragile and must be handled with care. To
protect the glass membrane and to maintain activation, a protective rubber
cap containing a suitable storage solution covers the glass membrane.
2.2. Electrode care & Electrode maintenance
pH Electrodes are susceptible to dirt and contamination and need to be clean
regularly depending on the extent and condition of use. At no time should one
touch or rub the glass bulb as this causes the build-up of electrostatic charge.
2.3. Storage
For best results, always keep the pH bulb wet. An optimal storage solution for
combination electrode is pH 4 buffer with 225 grams of KCl per liter. Table
salt, NaCl, can be used if KCl is not really available. Other pH buffers or tap
water are also acceptable storage media, but avoid storage in de-ionized
water. The protective rubber cap filled with the buffer solution provides ideal
storage for long periods.
2.4. After Use
After measurement is completed, follow the sequence below for storage.
- Wash the electrode and reference junction in de-ionized water.
- Close the refilling hole by returning its rubber sleeve or stopper cap.
(Necessary for only refillable electrode).
- Store the electrode as mentioned above (see section Storage).
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Ultrasonic milk analyzer
2.5. Electrolyte Replacement (for refillable electrode only).
The reference electrolyte needs to be refilled when the electrode has been
used for a long period, or when the internal electrolyte has dried up. To
accomplish this, follow the procedure described below.
- Remove the protective rubber cap or sleeve;
- Remove the protective rubber sleeve to expose the filling port of the
electrode;
- Remove the old reference electrolyte with a syringe;
- Fill the new reference electrolyte.
-
2.6. New electrolyte preparation:
Open the KCl container;
Add in de-ionized water until it reaches the level of 20 ml;
Close the container and shake it to dissolve the KCl;
Add in fresh electrolyte until it reaches the level of the refilling port. The
reference electrolyte used should be 3M(Mol) KCl;
Replace the rubber sleeve.
2.7. Re-use the electrode.
- Rinse the liquid junction with de-ionized water.
If these steps fail to restore normal electrode response, you may attempt to
rejuvenate it (See: Electrode Rejuvenation).
2.8. Electrode cleaning
Electrodes which are mechanically intact can often be restored to normal
performance by one or combination of the following procedures.
- Salt deposits:
Dissolve the deposit by immersing the electrode in tap water for ten to fifteen
minutes. Then thoroughly rinse with de-ionized water. Wash the electrode pH
bulb in a little detergent and water. Rinse electrode tip in with de-ionized
water.
- Oil/Grease films:
Wash electrode pH bulb in a little detergent and water. Rinse electrode tip
with de-ionized water.
- Clogged Reference Junction:
pH electrodes have junction, which allows the internal fill solution of the
measuring electrode to leak out into the solution being measured. The
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Ultrasonic milk analyzer
junction can become clogged by contamination in the solution. If a clogged
junction is suspected it is best to clear the junction.
Heat up the diluted KCl solution to 60-80°C. Place the sensing part of the pH
electrode into the heated KCl solution for approximately 10 minutes. Allow the
electrode to cool while immersed in some unheated KCl solution.
- Protein Deposits
Prepare 1% pepsin solution in 0.1 M HCI. Allow the electrode to stand in this
solution for five to ten minutes. Rinse the electrode with de-ionized water.
2.9. Electrode activation
Generally, if the procedure of storage and maintenance had been closely
followed, the electrode can
be used immediately. However, should the electrode response become
sluggish, it may be possible that the bulb has dehydrated.
The bulb can be dehydrated by immersing the electrode in an ideal storage
solution (e.g. buffer pH 4 solution) for 1-2 hours. If this fails, the electrode
may require re-activation. If the above procedure does not reactivate the
electrode to acceptable status, try rejuvenation the electrode by following the
procedure outlined below.
2.10. Rejuvenation Procedure
Dip and stir the electrode in freon or alcohol for 5 minutes.
Leave the electrode in tap water for 15 minutes.
Dip and stir the electrode in concentrated acid (HCI, H2S4) for 5 minutes.
Leave the electrode in tap water for 15 minutes.
Dip and stir in strong base (NaOH) for 5 minutes.
Leave the electrode in tap water for 15 minutes.
Test with standard calibration solution.
Finally, test with standard calibration buffer solution to see if the electrode
yields acceptable results. You may repeat again for better response
(maximum 3 times). If the response does not improve, then the electrode has
completed its useful life. Replace with a new electrode.
2.11. Electrode Lifespan
pH electrodes have a finite lifespan due to their inherent properties. How long
a pH electrode will last will depend on how it is cared and the solution it is
used to measure. Even if an electrode is not used it still ages. Electrode
demise can usually be characterized by a sluggish response, erratic readings
or a reading, which will not change. When this occurs an electrode can no
longer be calibrated. pH electrodes are fragile and have a limited lifespan.
How long an electrode will last is determined by how well is maintained and
the pH application. The harsher the system, the shorter the lifespan. For this
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reason it is always a good idea to have a back-up electrode on hand to avoid
any system down time.
3. Buffer Solutions
Buffers are solutions that have constant pH values and the ability to resist
changes in that pH level. They are used to calibrate pH measurement
system.
PH buffer solution description ( Pharmacopoeia standard)
Use only this types standard buffers for calibration!
pH 7.00±0,01/20ºC
Potassium dihydrogen
phosphate, Di-sodium
hydrogen phosphate
10ºC - 7.06
25ºC - 6.99
20ºC - 7.00
30ºC - 6.98
40ºC - 6.95
50ºC - 6.91
Description
Composition
Temperature
parameters
pH 4.00±0,01/20ºC
Borax,
Sodium
hydroxide solution
10ºC - 4.00
25ºC - 4.00
20ºC - 4.00
30ºC - 4.00
40ºC - 4.00
50ºC - 4.05
4. pH Electrode Calibration
pH Electrodes are like batteries; they run down with time and use. As an
electrode ages, its glass changes resistance. For this reason, electrodes
need to be calibrated on a regular basis. Calibration in pH buffer solution
corrects for this change.
Calibration is an important part of electrode maintenance. This assures not
only that the electrode is behaving properly but that the system is operating
correctly.
Usually pH meters require calibration at 3 specific pH values. One calibration
is usually performed at pH 7, second and third are typically performed at pH 4
and pH 10.
It is best to select a buffer as close as possible to the actual pH value of the
sample to be measured. Use standard calibration buffers that the
temperature and the sample solution are the same.
Use the operation manual for the corresponding pH meter.
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For Sensorex pH electrodes, originally supplied with the milk analyser
read the following information:
Temperature compensations
The output of pH electrodes varies with temperature in manner, predicted by
theory. When needed, Sensorex can supply electrode holders with build-in
automatic temperature compensators. The need of automatic compensation
depends on the temperature variation, the pH value being measured. At pH
of about 7 there is no error due to temperature and, of course, at a constant
temperature there is no error. As shown in the following table, the pH error
due to temperature is a function of both the temperature and the pH value
being measured. At a pH of about 7 there is no error due to temperature and,
of course, at a constant temperature there is no error. The more the
temperature changes from the ambient calibration temperature and the more
the pH departs from 7 the greater is the pH error.
pH temperature error table
C
pH
2
3
5
.30 .24
15
.15 .12
25
0
0
35
.15 .12
45
.30 .24
55
.45 .36
65
.60 .48
75
.75 .60
85
.90 .72
0 pH Error Range
4
.18
.09
0
.09
.18
.27
.36
.45
.54
5
6
7
8
9
.12 .06 0
.06 .12
.06 .03 0
.03 .06
0
0
0
0
0
.06 .03 0
.03 .06
.12 .06 0
.06 .12
.18 .09 0
.09 .18
.24 .12 0
.12 .24
.30 .15 0
.15 .30
.36 .18 0
.18 .36
Less than .1 pH Error Range
10
.18
.09
0
.09
.18
.27
.36
.45
.54
11
.24
.12
.12
.24
.36
.48
.60
.72
12
.30
.15
0
.15
.30
.45
.60
.75
.90
5. PH helpful hints
For greatest accuracy in pH measurement, follow these guidelines:
Use the same technique to measure samples, which was used for calibration.
Be consistent with stirring rates, times and conditions.
Calibrate with buffers, which are close in temperature to that of the sample.
Calibrate the pH electrode regularly, e.g. once an hour for accuracy to within
0.01 pH, or once a day for accuracy to within 0.1 pH.
Use fresh buffers for calibrations. Avoid contamination of the stock buffer
solution and do not use it beyond the expiry date.
Keep all connections dry.
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Immerse the electrode far enough into the solution to insure the reference
junction is below the surface.
Allow adequate time for the electrode to stabilize in standards and samples
before taking a reading.
Clean the electrode periodically. Allow more time for aged electrodes.
Do not use the pH electrode in solutions of fluoride ion at low pH. This will
etch the glass membrane.
Sulphide vapors can permeate the electrode wick and contaminate the
reference element. Minimize contact in such environments and change the
reference electrolyte frequently.
Preparation for pH measurement
When the analyzer is with pH measuring option, it is received from the
customer with pH probe packed separately and there’s a stopper on its place.
If you need to measure pH follow the procedure below:
1. Loosen the nut anti-clockwise (1).
2. Pull up the stopper (2)
3. Carefully place the pH probe paying attention not to remove the sealing Oring (3)
4. Place the probe with the nut in the hole (C & D) and tighten it.
It is very important to close the nut tightly, paying attention not to allow air to
enter the system.
If you are working with the analyser regularly (each day) do not remove the
probe after work.
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If you ‘ll not use the analyser more than 2 days, you must take out the probe
and to place the stopper back.
The pH probe must be stored separately as per the instructions of point 2.3
Appendix 3.
7. PH measuring.
Measuring pH is an additional feature of the analyser and is optional.
Remove the protective rubber cap of the pH electrode. Take care to handle it
appropriate in order not to be damaged. Use de-ionized or distilled water to
rinse the electrode before usage. Fill in the sample holder with milk, put it in
the recess of the analyser and dip the pH electrode into the milk sample,
ensuring complete dip of the electrode in the sample. Stir gently for
homogenization of the sample.
Measuring can be done in two modes:
Off line by starting the menu pH & Co Meter | Measuring, when the
analyser works only as a pH meter.
On line automatic pH measuring, when measuring the rest of the sample’s
parameters.
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When starting work with рН meter first connect the probe/sensor, and then
the power supply of the device.
Having in mind the characteristics of the process of pH measuring it is
necessary to dip the рН probe in the sample and then start measurement.
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APPENDIX 4 CONDUCTIVITY MEASURING
1. Method of determination.
Conductivity (or Electrolytic Conductivity) is defined as the ability of a
substance to conduct electrical current. It is the reciprocal of the resistance.
In a healthy animal*, the mean value of electric conductivity is:
Milk type
Cow milk
Sheep milk
Buffalo
Conductivity values
between 4 to 6 mS/cm (18°C);
between 3 to 5 mS/cm (18°C);
between 2,5 to 5 mS/cm (18°C);
*These values depend on the geographical region, the breed and on other
factors.
Milk conductivity changes on the concentration of ions in the milk:
Added water, sugar, Decrease the ion's concentration. Milk conductivity
proteins,
insoluble decreases.
solids
Added salts
Increase the ion's concentration. Milk conductivity
increases. Increase the ion's concentration. Milk
conductivity increases. Often the milk is falsified
by adding salt: towards milk with good
characteristics: fat 4%, SNF 8,8, conductivity 4,5
are added salt and water. Then the results are
changed to 3,2 and 8,8, conductivity 10. In other
words adding water regulates the increased value
of SNF and density till normal (within the
boundaries/parameters) and even the fat is
normal. By the values of these parameters may be
determined if the sample is falsified, but the only
characteristic, proving this is conductivity, which is
out of boundaries nevertheless added water. But
be careful, as the falsification is not the only
possible reason for conductivity increasing. The
other possibility is mastitis that’s why we
recommend using another (chemical) method for
checking it.
Significantly extreme Should indicate the development of mastitis.
value (6,5 - 13,00 Infections damage the tissue of the udder. This
mS/cm (18°C)
allows sodium and chlorine ions from the blood to
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be released into the milk. The concentration of
ions in the milk is thereby raised, and it can more
easily conduct an electrical current - the
conductivity of the milk increases.
Milk conductivity can be used as tests for degree of water evaporation in
condense milk production.
Milk conductivity change notifies of powder (dry) milk solution rate.
2. Conductivity measurement
Conductivity measurement is additional possibility of the analyser and is
delivered on customers request/
5. Corrections in conductivity measurement.
Please, follow the instructions on the display of the tablet.
7. Conductivity calibration buffer preparation
In order a standard buffer for conductivity measuring to be prepared follow
the instruction below:
1. Take the packet with the powder buffer.
2. Carefully shake the packet in order to gather the powder at the bottom.
3. Cut one end of the packet.
4. Empty its content in a measuring mug with 1 l volume, paying attention
all its content to be emptied.
For standard buffer:
5,02 ms
–
3,056 г
5. Add 600-700 ml distilled water, which was preliminarily deaerated in
vacuum dryer or boiled and then cooled down to 20 ˚С.
6. Shake the mug till the powder is fully dissolved.
7. Add distilled water to the mark.
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Contents:
1.
FUNCTION ............................................................................................................................................................. 5
2. TECHNICAL PARAMETERS ................................................................................................................................... 6
2.1. WORKING MODES CHARACTERISTICS: ........................................................................................................ 6
2.1.1. MEASUREMENT MODE MILK / DAIRY PRODUCT – FIRST TYPE ................................................................................ 6
2.1.2. MEASUREMENT MODE MILK / DAIRY PRODUCT – SECOND TYPE ............................................................................ 6
2.1.3. MEASUREMENT MODE MILK / DAIRY PRODUCT – THIRD TYPE ............................................................................... 6
2.1.4. CLEANING ............................................................................................................................................................. 6
2.2. MEASURING RANGE: ............................................................................................................................................ 7
2.3. ACCURACY: ............................................................................................................................................................. 7
2.4 CORRECT AMBIENT CONDITIONS: .................................................................................................................. 8
2.5. DIMENSIONS: .......................................................................................................................................................... 8
2.6. CONTINUOUS WORKING TIME: ........................................................................................................................ 8
2.7 MILK SAMPLE VOLUME PER ONE MEASUREMENT: .................................................................................. 8
3. QUALIFICATION OF RAW MILK, THERMALLY TREATED MILK, OTHER DAIRY PRODUCTS AND
DERIVATIVES .............................................................................................................................................................. 10
3.1. TAKING SAMPLES AND PREPARATION FOR ANALYSIS ......................................................................... 10
3.2. MAKING THE MEASUREMENT. ....................................................................................................................... 10
3.2.1. PREPARING THE ANALYZER FOR WORKING MODE ............................................................................................... 10
4. CLEANING THE ANALYZER ................................................................................................................................ 14
4.1. PERIODICALLY CLEANING (RINSING) THE ANALYZER ........................................................................ 14
4.1.1. PERIODICAL CLEANING FREQUENCY. .................................................................................................................. 14
4.1.2. MAKING THE RINSING ......................................................................................................................................... 15
4.2. COMPLETE CLEANING ...................................................................................................................................... 15
4.2.1. COMPLETE CLEANING FREQUENCY ..................................................................................................................... 15
4.2.2. CLEANING ........................................................................................................................................................... 16
5. MENUS’ DESCRIPTION. ......................................................................................................................................... 19
FILE .............................................................................................................................................................................. 19
System Setup............................................................................................................................................................ 19
Reset System ............................................................................................................................................................ 19
Exit .......................................................................................................................................................................... 19
ShutDown ................................................................................................................................................................ 19
SUPPLIER ...................................................................................................................................................................... 19
Add Supplier............................................................................................................................................................ 19
Edit Supplier ........................................................................................................................................................... 19
TOOLS .......................................................................................................................................................................... 20
LSCal....................................................................................................................................................................... 20
Calibration .............................................................................................................................................................. 20
Program control: .................................................................................................................................................... 20
LS-MENU ..................................................................................................................................................................... 22
Special Modes ......................................................................................................................................................... 22
CORRECTION ................................................................................................................................................................ 22
Temperature Correction.......................................................................................................................................... 22
All Corrections ........................................................................................................................................................ 23
Corrections ............................................................................................................................................................. 23
SETTINGS ...................................................................................................................................................................... 24
Set Calibration Names ............................................................................................................................................ 24
Save Calibration ..................................................................................................................................................... 25
Restore Calibration ................................................................................................................................................. 25
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Autoprint Enable/Disable........................................................................................................................................ 25
Format Results: ....................................................................................................................................................... 26
High Fat Control ..................................................................................................................................................... 26
High Fat Speed For Calibration ............................................................................................................................. 26
TESTS ........................................................................................................................................................................... 27
Test Pump................................................................................................................................................................ 27
Ultrasound .............................................................................................................................................................. 27
Set Amplitude .......................................................................................................................................................... 28
CLEANING .................................................................................................................................................................... 28
PH & CO METER ........................................................................................................................................................... 28
pH Meter En/Dis ..................................................................................................................................................... 28
pH Test .................................................................................................................................................................... 29
pH Measure ............................................................................................................................................................. 29
pH Meter Calibration .............................................................................................................................................. 29
Co Meter En/Dis ..................................................................................................................................................... 30
Co Meter Test .......................................................................................................................................................... 30
Co Meter Calibration .............................................................................................................................................. 30
5 Sample calibration ............................................................................................................................................... 31
PUMP CONTROL ............................................................................................................................................................ 31
Pump In ................................................................................................................................................................... 31
Pump Out ................................................................................................................................................................ 31
Stop ......................................................................................................................................................................... 31
MEASUREMENT ............................................................................................................................................................ 32
Discard Last measurement ...................................................................................................................................... 32
HELP ............................................................................................................................................................................. 32
LS Identity ............................................................................................................................................................... 32
About ....................................................................................................................................................................... 32
Admin Mode ............................................................................................................................................................ 32
ADMIN MODE ............................................................................................................................................................... 32
Restore Factory Settings ......................................................................................................................................... 32
6. PERISTALTIC PUMP SERVICE...................................................................................................................................... 33
7. POSSIBLE MALFUNCTIONS AND ERROR MESSAGES, TROUBLESHOOTING ..................................... 33
8. MAKING CORRECTIONS AND RECALLIBRATION OF THE DEVICE ....................................................... 36
8.1. TAKING SAMPLES AND PREPARATION OF SAMPLES FOR CHECKING THE ACCURRACY OF
THE MILK ANALYSER, MAKING CORRECTIONS AND RECALIBRATION ................................................ 36
8.2. DETERMINATION THE TYPE OF THE DISCREPANCY: ............................................................................ 36
8.2.1. MAKING MEASUREMENTS ................................................................................................................................... 36
8.2.2. ANALYSING THE MEASUREMENT RESULTS .......................................................................................................... 36
8.3. MAKING CORRECTIONS ................................................................................................................................... 37
8.3.1. POSSIBLE CORRECTIONS, LIMITS AND CHANGING STEPS ...................................................................................... 37
9.BASIC PRINTER CHARACTERISTICS............................................................................................................................. 38
10. ADDITIONAL POSSIBILITIES OF THE ANALYSER...................................................................................... 41
10.1. CONNECTING TO 12 V DC POWER SUPPLY. .............................................................................................. 41
10.2. MEASURING HIGH FAT SAMPLES (OPTION)............................................................................................. 41
APPENDICES ................................................................................................................................................................. 42
APPENDIX 1: PREPARATION OF SAMPLES FOR MILKANALYSERS’ CALIBRATION ............................. 42
APPENDIX 2 FREEZING POINT DETERMINATION ........................................................................................... 47
1. METHODS FOR DETERMINATION. .............................................................................................................................. 47
2. THE BASIC FREEZING POINT. ..................................................................................................................................... 47
APPENDIX 3 PH MEASURING .................................................................................................................................. 50
1. GENERAL INFORMATION ........................................................................................................................................... 50
2. PH ELECTRODE ......................................................................................................................................................... 50
2.1. ELECTRODE PART .............................................................................................................................................. 50
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2.2. ELECTRODE CARE & ELECTRODE MAINTENANCE ................................................................................ 50
2.3. STORAGE ................................................................................................................................................................ 50
2.4. AFTER USE ............................................................................................................................................................. 50
2.5. ELECTROLYTE REPLACEMENT (FOR REFILLABLE ELECTRODE ONLY). ....................................... 51
2.6. NEW ELECTROLYTE PREPARATION: ........................................................................................................... 51
2.7. RE-USE THE ELECTRODE. ................................................................................................................................ 51
2.8. ELECTRODE CLEANING .................................................................................................................................... 51
2.9. ELECTRODE ACTIVATION ............................................................................................................................... 52
2.10. REJUVENATION PROCEDURE ....................................................................................................................... 52
2.11. ELECTRODE LIFESPAN.................................................................................................................................... 52
3. BUFFER SOLUTIONS .................................................................................................................................................. 53
4. PH ELECTRODE CALIBRATION .................................................................................................................................. 53
5. PH HELPFUL HINTS ................................................................................................................................................... 54
PREPARATION FOR PH MEASUREMENT.......................................................................................................................... 55
7. PH MEASURING. ........................................................................................................................................................ 56
APPENDIX 4 CONDUCTIVITY MEASURING ........................................................................................................ 58
1. METHOD OF DETERMINATION. .................................................................................................................................. 58
2. CONDUCTIVITY MEASUREMENT ...................................................................................................................... 59
5.
CORRECTIONS IN CONDUCTIVITY MEASUREMENT. ........................................................................... 59
PLEASE, FOLLOW THE INSTRUCTIONS ON THE DISPLAY OF THE TABLET. ......................................... 59
7. CONDUCTIVITY CALIBRATION BUFFER PREPARATION .......................................................................... 59
CONTENTS: .................................................................................................................................................................... 60
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Ultrasonic milk analyzer
GUARANTEE CARD
LACTOSCAN LAWS
Guarantee period is 1 (one) year after purchasing date.
Improper handling, transport and storage will invalidate the guarantee.
Guarantee is void if warranty labels are removed.
Serial №
Date of purchase:
Password:
Distributor:
Signature:
Stamp:
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Ultrasonic milk analyzer
GUARANTEE CARD
Purchaser:
Service report:
Service
entry date
Damage
Delivery
date
Signature
Covers:
Lactoscan LAWS
Last edited: 28.09.2016
HEAD OFFICE:
4, Narodni Buditeli Str.
8900 Nova Zagora
BULGARIA
Phone/Fax: + 359 457 67082
office@lactoscan.com
www.lactoscan.com
www.milkotronic.com
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