75
MRS-BA-defsi-0410
GB
KERN MRS120-3
Version 1.0 01/2004
Operating Instructions
Moisture Analyzer
Contents
1.Introduction ................................................................................77
1.1 Useful tips on the Operating Instructions...............................77
1.2 Declaration of conformity.......................................................79
2 Safety ................................................................................80
2.1 Representations and symbols................................................80
2.2 Safety instructions .................................................................80
3 Set up ................................................................................82
3.1 Unpacking..............................................................................82
3.2 Transport, storage .................................................................83
3.2.1 Transport and shipping.................................................83
3.2.2 Storage.........................................................................83
3.3 Inspection and assembly .......................................................84
3.4 Choosing a suitable location..................................................85
3.5 Connecting it to the mains .....................................................86
3.6 Safety measures....................................................................87
3.7 Levelling.................................................................................87
3.8 Weight calibration ......................................... ............... .......... 88
3.9 First measurement.................................................................89
4 Operation ................................................................................93
4.1 Panel Sheet...........................................................................93
4.2 Menu control operation principle............................................94
4.3 Setting and saving the configuration............................ .......... 96
4.4 Instrument configuration . ................. ................ ............... ....... 96
4.4.1 Activating the configuration menu................................97
4.4.2 Language function........................................................97
4.4.3 Configuring the report printout......................................98
4.4.4 Configuring the application menu...............................100
4.4.5 Balance calibration.....................................................100
4.4.6 Temperature calibration .............................................100
4.4.7 Interface functions......................................................101
4.4.8 Date and time.............................................................101
4.4.9 Password protection...................................................102
4.4.10 Anti-theft encoding .....................................................104
4.4.11 Key tone.....................................................................105
4.5 Application menu operation .................................................106
4.5.1 Activating the application menu..................................107
4.5.2 Methods .....................................................................107
4.5.2.1 Saving a method....................................................108
4.5.2.2 Loading a method.............................. ............ ........ 109
MRS-BA-defsi-0410 76
4.5.2.3 Deleting a method .................................................109
4.5.2.4 Setting method name.................. ................................. .......... 110
4.5.3 Starting weight ...........................................................110
4.5.4 Units...........................................................................110
4.5.5 Print rate.....................................................................112
4.5.6 Standby temperature..................................................112
4.5.7 Autostart.....................................................................112
4.6 Special operating keys.........................................................113
4.6.1 The tare key...............................................................113
4.6.2 The print key ..................... ................ ............... ..........114
4.6.3 The change key..........................................................117
4.6.4 The start/stop key.......................................................117
5 Determining moisture levels........................................................ 118
5.1 Fundamental principles........................................................118
5.1.1 Adj ust ing to th e existing measuring process..............119
5.2 Sample preparation ................................................... .......... 119
5.2.1 Preventing samples being en crusted .........................120
5.3 Setting drying parameters.................................................... 121
5.3.1 Heating program ........................................................121
5.3.2 Temperature...............................................................123
5.3.3 Timer stop..................................................................123
5.3.4 Switch-off criteria.............................. ................ ..........124
5.4 Application table (recommendations)...................................125
6 Data transfer ..............................................................................127
6.1 Connection scheme.............................................................128
6.2 Remote control commands.............. ................ ....................129
6.2.1 Examples of the remote contro l of the instr................130
7 Service ..............................................................................131
7.1 Maintenance and servicing..................................................131
7.2 Replacing the mains fuse.....................................................132
7.3 Calibration................................................... ............... .......... 133
7.3.1 Calibrating the balance...............................................133
7.3.2 Calibrating the temperature................................ ........135
7.4 Software update via Internet....................... ............... .......... 137
7.5 Error messages ..................................................................137
7.4.1 Notes on corr ecting faults...........................................137
8 Overview ..............................................................................139
8.1 Technical data .....................................................................139
8.2 Configuration menu tree ...................................................... 141
8.2.1 Application menu tree.................................................143
8.2.2 Key menus....................................................... ..........145
8.2.3 Setting drying parameters..........................................146
8.2.4 Setting and saving the configuration ..........................146
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MRS-BA-defsi-0410
1. Introduction
The MRS 120-3 moisture analyzer is simple and functional to
operate. It is used as a quick and reliable means of determining the
moisture content in powders and liquids by the thermogravimetric
principle.
The key features of the MRS 120-3:
•
high-end balance technology built to the highest
international standard
•
optimum resolution
•
easy-to-read vacuum fluorescen t display
•
large viewing window for perfect sample monitoring
•
a memory for 5 methods, with all the drying settings
•
automatic detection that the measurement has ended by
means of ADAPTSTOP
•
password protection to prevent unauthorized changes to
the instrument configuration and drying parameters
•
anti-theft code
• printout in line with GLP guidelines (Good Laboratory
Practice)
•
software update via the Internet
1.1 Useful tips on the Operating
Instructions
Take the time to read these Operating Instructions from start to
finish so that yo u can make full use of the many benefits and
possibilities of the MRS 120-3 in your day-to-day work.
These Operating Instructions contain guidance in the form of
pictographs and keypad diagrams, which should help you in finding
the required information:
– Key names are presented inside quotation marks and are
highlighted in bold font: «ON/OFF» or «
».
– In order to aid clarity in the explanation of the operating steps, the
display for each ste p is shown graphically on the left alongside
the list of operating steps:
MRS-BA-defsi-0410 78
•
Display shows List of operating steps
Sprache Deutsch
or
Langue francaise
or
language english
•
If you press the «
» key
repeatedly,
“SPRACHE DEUTSCH”,
“LANGUAGE ENGLISH” or
“LANGUE FRANCAISE” appears
in the display.
– See
section 2 "Safety
" for the symbols t o indicate risks and tips.
79
MRS-BA-defsi-0410
1.2 Declaration of conformity
KERN & Sohn GmbH
Ziegelei 1
D – 72336 Balingen
E-Mail: info@kern-sohn.com
Tel: 0049-[0]7433- 9933-0
Fax: 0049-[0]7433-9933-149
Internet: www.kern-sohn.com
Declaration of conformity
Declaration of conformity for apparatus with CE mark
Konformitätserklärung für Geräte mit CE-Zeichen
Déclaration de conformité pour appareils portant la marque CE
Declaración de conformidad para aparatos co n disitintivo CE
Dichiarazione di coformitá per appar ec c hi contrassegnati con la marcatura CE
English We hereby declare that the product to which this declaration refers conforms
with the following standards.
Deutsch Wir erklären hiermit, daß das Produkt, auf das sich diese Erklärung bezieht, mit
den nachstehenden Normen übereinstimmt.
Français
Nous déclarons avec cela responsabilité que le produit, auquel se rapporte la
présente déclaration, est conforme aux normes citées ci-après.
Español
Manifestamos en la presente que el producto al que se refiere esta declaración
est´´a de acuerdo con las normas siguientes
Italiano Dichiariamo con ciò che il prodotto al quale la presente dichiarazione si riferisce
è conforme alle norme di seguito citate.
Moisture Balance: KERN MRS120-3
Mark applied EU Directive Standards
73/23EEC Low voltage EN 61010
89/336EEC EMC EN 61326
Date: 02.03.2004
Signature:
Gottl. KERN & Sohn GmbH
Management
Gottl. KERN & Sohn GmbH, Ziegelei 1, D-72336 Balingen, Tel. +49-[0]7433/9933-0,Fax +49-[0]7433/9933-149
MRS-BA-defsi-0410 80
2 Safety
2.1 Representations and symbols
Important safety-related instructions are highlighted visually at the
description of what to do:
DANGER
Warning of a possible danger which may lead to death or to
serious injury.
CAUTION
Warning of a possible danger which may lead to minor injury or
damage.
NOTE
Tips and important rules on how to use the MRS 120-3 moisture
analyzer correctly.
2.2 Safety instructions
•
When using the instrument in surroundings with increased
safety requirements, pay careful attention to the appropriate
regulations.
•
Only use an extension cord with a protective earth conductor.
• If the mains cord is damaged, disconnect the instrument from
the electrical supply immediately and replace the mains cord.
•
If there is any reason to believe that it is no longer possible to
operate the MRS 120-3 safely, unplug the instrument
immediately from the electrical supply and secure it so that it
cannot be operated inadvertently.
•
When carrying out maintenance work, it is essential to heed the
tips in (cap. 7.1 Maintenance and servicing).
• The Operating Instructions must be read by everyone who has
to operate the instrument and must be kept handy on-site at all
times.
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MRS-BA-defsi-0410
DANGER
Do not place any flammable materials on, under or beside the
instrument.
Leave enough clear space around the instrument to prevent a buildup of heat.
The MRS 120-3 may not be used to analyze explosive, highly
flammable samples.
Do not operate the MRS 120-3 moisture analyzer in areas where
there is any risk of explosion.
Sample materials which release toxic substances must be dried in a
fume hood. Take care not to inhale any harmful vapors.
Ensure that no liquid seeps inside the instrument or into the
connection ports on the back of the instrument.
If you spill any liquid onto the instrument, unplug it from the electrical
supply immediately.
Do not operate the moisture analyzer again until you have had it
checked by a KERN service engineer.
CAUTION
Some of the parts, like the heating element and the viewing window,
may become considerably hotter while it is in operation. Only touch
the instrument using the handles provided.
Take care when you remove the sample. The actual sample, the
heating unit and sample pans used may still be very hot.
The MRS 120-3 should generally be used for drying substances
containing water. Sample materials which give off aggressive vapors
(like acids) may cause corrosion problems to develop on parts of the
instrument.
If any damage or injury occurs, liability and responsibility rest with the
user.
MRS-BA-defsi-0410 82
3 Set up
3.1 Unpacking
The MRS 120-3 moisture analyzer comes in environmentallyfriendly packaging, specifically developed for this precision
instrument, which provides optimum protection for the instrument
during transportation.
NOTE
Retain the original packaging in order to avoid the MRS 120-3
moisture analyzer becoming damaged in transit when it is shipped or
transported and to store the MRS 120-3 under optimum conditions if
it is out of operation for an extended period.
Follow instructions carefully when you unpack the MRS 120-3
moisture analyzer in order to avoid damaging it:
•
Unpack the instrume n t ca r efully and gently. This is a precision
instrument.
• When temperatures outside are very low, the balance should
first be stored for a few hours in the unopened transport
package in a dry room at normal room temperature, so that no
condensation settles on the balance when it is unpacked.
• Check the moisture analyzer for any external visible signs of
damage immediately after you unpack it. If you find that it has
been damaged in transit, notify your KERN service agent
immediately.
• If the MRS 120-3 moisture analyzer is not being put into
operation immediately after purchase, store it in a dry place
with minimal fluctuations in temperature (Cap.3.2.2 “
Storage”)
•
Read these Operating Instructions carefully before operating the
balance, even if you have used KERN equipment before and pay
particular attention to the safety instructions (Cap.2 “Safety”).
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MRS-BA-defsi-0410
3.2 Transport, storage
3.2.1 Transport and shipping
Your MRS 120-3 moisture analyzer is a precision instrument. Treat
it with care.
Avoid shaking it or subjecting it to any heavy jolts or vibrations
during transport.
Avoid serious temperature fluctuations and getting the instrument
damp (condensation) during transport.
NOTE
The MRS 120-3 moisture analyzer should ideally be shipped and
transported in its original packaging to avoid damage in transit.
3.2.2 Storage
If you do not intend to use the instrument for a long time, unplug it
from the electrical supply, clean it thoroughly and store it in a place
that meets the following conditions:
•
No serious shaking or vibrations
•
No serious fluctuations in temperature
•
No direct exposure to sunlight
•
No moisture
NOTE
The MRS 120-3 moisture analyzer should ideally be stored in its
original packaging because it gives it optimum protection.
MRS-BA-defsi-0410 84
3.3 Inspection and assembly
The moisture analyzer does not come fully assembled. Once you
have unpacked all the parts, check that the delivery is complete
and assemble the individual components in the order indicated
below.
Components delivered Components delivered
MRS 120-3 moisture analyzer In-use cover for the display
Mains cord 30 sample pans (4)
Draftshield (1) Operating Instructions
Pan support (2) Warranty card
Sample holder (3) Declaration of conformity
85
MRS-BA-defsi-0410
•
Assemble the in-use cover f or t h e di sp lay
•
Open the hood and insert the draftshield (1), making sure that it
is placed on flat.
•
Insert the pan support (2) and turn it so that it locks securely in
place.
•
Insert the sample holder (3) as shown.
•
You can now place an aluminium pan (4) on the pan support.
NOTE
All the parts must be attached together without exerting undue force.
Do not apply any force. If you have any problems, the KERN
customer service will be happy to help.
3.4 Choosing a suitable location
In order to ensure that the moisture analyzer functions properly,
select a location that fulfils the following criteria:
•
Permissible ambient temperatures
-
Temperature: 5°C ... 40°C
-
Relative humidity: 25% ... 85%, non-condensing
•
Put the instrument on a rigid, firm horizontal base, preferably
exposed to no vibrations
•
Make sure that the instrument cannot be shaken or knocked
over
• Do not expose it to direct sunlight
•
Avoid drafts and excessive temperature fluctuations
•
Leave enough clear space around the instrument to prevent a
build-up of heat.
Do not expose the instrument to high levels of moisture for long
periods of time. Avoid letting condensation form on the instrument.
If instruments are cold, let them warm up to room temperature
(approx. 20°C) before connecting them to the mains.
Condensation is practically impossible on instruments which are
connected to the mains.
MRS-BA-defsi-0410 86
3.5 Connecting it to the mains
Follow safety instructions when connecting the instrument to the
mains:
DANGER
The instrument may only be operated using the original mains cord
supplied.
If the mains cord supp lie d is not long enough, only use an extension
cord fitted with a protective earth conductor.
Plug the mains cord into a socket which has been installed in
accordance with regulations and is fitted with a PE terminal.
For technical reasons, the heating unit is designed in the factory to
accommodate a voltage of 230 V or 115 V and in accordance with
your order. Check that the setting matches the local setting?
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MRS-BA-defsi-0410
3.6 Safety measures
The safety class 1 instru me nt, the MRS 120-3, may only be
plugged into a socket which has been installed in accordance with
regulations and is fitted with a protective earth terminal. The safety
effect may not be undone by using an extension lead without an
earth wire. If t h e voltage is coming from m ai n s su pp lie s wit h out a
protective earth terminal, arrange for an electrician to create a
comparable level of p rotection in accordan ce with valid installation
regulations.
3.7 Levelling
In order to function properly, the MRS 120-3 moisture analyzer
must be precisely horizontal.
The instrument is fitted with a “levelling bubble” and two rotatable
feet for level-control, with the aid of which it is possible to
compensate for sm all height differences and/or unevennesses in
the surface on which the instrument is standing.
The two screw feet must be adjusted so that the air bubble is
precisely in the center of the sight glass of the levelling bubble.
NOTE
The instrument must be carefully relevelled each time it is moved in
order to obtain accurate measurements.
Incorrect Correct
MRS-BA-defsi-0410 88
3.8 Weight calibration
Since the Earth's gravity is not the same everywhere, each balance
must be adjusted to compensate for the gravity at each location, in
accordance with the underlying physical weighing principle. This
adjustment process, which is known as “calibration”, must be
carried out on initial installation and then each time the instrument
is moved to another location. However, in order to get exact
measurements, the instrument should also be recalibrated
periodically.
NOTE
The MRS 120-3 moisture analyzer must be calibrated when it is
initially installed and then each time it is moved to another location.
If you work in accordance with “Good Laboratory Practice GLP”, observe
the prescribed intervals between calibrations (adjustments).
The calibration is set in the configuration menu (see chapter 4.4.5
"Balance calibration")
With the aid of the “Intelligent Calibration Mode” (ICM), the
instrument can determine the size of the calibration weight itself,
facilitating exact calibration with diff erent size weights (in 10 g
increments);(see chapter 7.3.1 "Calibrating the balance")
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MRS-BA-defsi-0410
3.9 First measurement
Once the MRS 120-3 moisture analyzer is successfully up and
running, you can perform an initial measurement to familiarize
yourself with the new instrument and to test it for any malfunctions.
Switch the instrument on using the «ON/OFF» key. The instrument
performs a self-diagnostics test to check the main functions. After
completion of the start-up process (which takes about ten
seconds), “Zero” appears in the display; this means that the
instrument is now ready for operation.
During the first measurement, the instrument uses the drying
parameters set in the factory.
•
Open the hood of the instrument
•
Place the sample holder with an
empty weighing pan onto the
weighing pan holder.
Note: The weighing pan must sit
flat on the weighing pan holder.
Always work with the sample
holder; it allows you to work
safely and prevents possible
burning ones self.
•
Press the « TARE » key.
The instrument is ready to weigh
the sample.
MRS-BA-defsi-0410 90
•
Pour approx. 1.0 g of water into
the weighing pan.
•
Close the hood
The instrument is prepared for
the first measurement.
• Start the measurement by
pressing the
«START/STOP»
key.
The heating element heats up to
105°C, and the fan starts to cool.
•
The dryer display is divided into
+ 100.00 %
STd-- °C 0.1MIN
•
the measurement display and
the info line
91
MRS-BA-defsi-0410
+ 93.27 %
STD 105°C 2.3MIN
•
The result appears in the
measurement display in the unit
of measurement set.
•
The info line displays the heating
mode used (standard), the
current temperature (105°C) and
the current duration of the
measurement (2.3 min.).
If the temperature is under 40°C,
three dashes are displayed: "--°C".
•
Once the drying has ended, an
audio signal sounds, and the
heating is switched off.
The fan keeps running until the
temperature in the sample room
drops below 40°C.
+ XX.xx %
DURATION XX.X MI N
•
The measurement display shows
the result in the unit of
measurement set.The
measurement result is displayed
in the other units of
measurement by pressing the
«F» key.
•
The info line shows how long the
measurement takes.
MRS-BA-defsi-0410 92
•
Open the hood
•
Carefully remove the weighing
pan, only gripping the sample
holder by the handle.
Caution! All the parts of the
sample chamber are hot.
Allow the weighing pan and
holder to cool down before
doing anything else with them.
• Insert a new weighing pan into
the instrument.
•
Press the
«TARE»
key; the
instrument is ready for you to
perform a new measurement.
CAUTION
The weighing pan and holder are hot!
93
MRS-BA-defsi-0410
4 Operation
The MRS 120-3 moisture analyzer has two main menus: the
configuration menu and the application menu.
Instrument-specific parameters and the layout of the report printout
are defined in the
configuration menu
. You can either work with
the basic configuration programmed in the factory or define and
save a user configuration which is adapted to suit your specific
needs.
Dryer-specific parameters can be set in the application menu.
The weighing help is also activated and defined in this menu.
4.1 Panel Sheet
MRS-BA-defsi-0410 94
4.2 Menu control operation principle
The configuration menu and the application menu each have a
main path and up to two sub-paths in which the parameters for the
different functions of the instrument are defined.
Use the cursor ke ys «
», « », « » and « » to move
within the paths.
95
MRS-BA-defsi-0410
NOTE
The geometry of the menu tree diagram corresponds to the path
configurations of the two main menus.
In program operation mode, the key symbols highlighted in
blue
apply on the control panel.
Key(s) Designation Function in weighing mode
•
Changes from the main
menu path to the sub-paths
and vice versa.
•
Moving up/down within the
main path or sub-paths.
•
Changing selected
parameters
•
Selecting parameters
•
Saving the changed
parameters
«esc»
•
Cancelling an entry
• Exiting the menu
«ins»
•
Setting a space (in text
entries)
«clr»
•
Clearing an entry (in text
entries)
«PRINT»
•
Entering a decimal point (in
text entries)
MRS-BA-defsi-0410 96
4.3 Setting and saving the configuration
– Press «
ON/OFF
» to switch the instrument on.
– During the start-up process, keep the «TARE» and «MENU»
keys pressed in until the configuration you require appears in the
display, then let the keys go:
"FACTORY CONFIG.": Load the factory configuration.
"USER CONFIG.": Load the user configuration.
"STORE CONFIG": Save the current configuration as
the user configuration.
4.4 Instrument configuration
This section explains the structure of the configuration menu and its
functions.
Main path Definable functions
SET
DATA PRINT
Print formats; type of values to print
SET APP. MENU Defining the application menu
SET
BALANCE CAL.
Balance calibration method
TEMP. CAL Activate the temperature calibration
SET
INTERFACE
Baud rate, parity, handshake functions of
periphery interface
SET
DATE AND TIME
Date and time (standard format or American
format p.m. and a.m.)
PASSWORD Password protection for the menu definitions
THEFTCODE
Activation/deactivation and change to the antitheft code
KEY TONE Activation of the keypad sound
CONTRAST Not described
LANGUAGE
Language (E, D, F)
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MRS-BA-defsi-0410
Representation conventions:
•
The settings programmed in the factory are depicted in
bold
.
•
In order to aid clarity, the only part of the menu tree shown in
each function description is the part which relates to the
function in question.
Explanations on the menu functions are depicted in italics.
4.4.1 Activating the configuration menu
•
Press «ON/OFF» to switch the MRS 120-3 on.
•
Keep the «MENU» key pressed in continuously during the
start-up process (which takes about ten seconds) until "SET
DATA PRINT" appears in the display.
•
You can now change the configuration menu.
4.4.2 Language function
• LANGUAGE
SPRACHE DEUTSCH
LANGUAGE ENGLISH
LANGUE FRANÇAISE
Selecting a language
Procedure for changing the language:
•
Activate the configuration menu
SPRACHE DEUTSCH
or
LANGUE FRANÇAISE
or
LANGUAGE
ENGLISH
•
If you press «
», the language
currently activated is displayed.
•
If you press «
»
LANGUAGE ENGLISH
•
The language flashes now.
• Keep pressing «
» until the
language you require appears.
SPRACHE DEUTSCH
•
Press «
» to confirm the choice of
language.
•
Press «esc» to exit the menu.
MRS-BA-defsi-0410 98
4.4.3 Configuring the report printout
The report printout can be configured in the "SET DATA PRINT"
menu option. The options marked "ON" are contained in the report
and are printed.
The "MODE PC" function allows the measurement printout to be
output in a format which the PC can support. This format only
affects the print rate printout and is used for the graphical
evaluation of the drying process with the aid of a computer program
(such as Excel). The individual measurements are output
separated by tabs, allowing them to be imported easily into a table.
• SET
DATA
PRINT
SET PRINTFORMAT DATE AND TIME ON/OFF
BALANCE-ID
ON
/OFF
METHOD-ID ON/OFF
COUNTER ON/OFF
DRYER SETUP
ON
/OFF
PRINT RATE ON/OFF
OPERATOR-ID ON/
OFF
PRINT RATE 1.0 MIN
OPERATOR ttt...
MODE
PRINTER
Printout in text format
(40 characters)
MODE PC Print rate printout in a format
supported by the PC. The
individual measurements are
separated by a tab.
The elements set in "SET PRINTFORMAT" are printed out.
• The interval at which interim results are printed is set at "PRIN T
RATE". The print interval can be set in 0.1 min increments from
0.1 ... 10.0 min.
•
An alphanumerical ID can be entered for the operator at
"OPERATOR ttt...".
When a peripheral instrument (e.g. a printer) is connected, the
instrument interface must be configured in the "SET INTERFACE"
submenu.
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MRS-BA-defsi-0410
Example of a report printout with all the available selection options.
*********** KERN MRS 120-3 ***********
------------------------------------------------
Report title, only output in printer mode.
Date 07.10.2002 Time 11:06:01
Date and time, if this is switched on.
Name : MRS 120-3
Software : N50-0040
Serialno : 3300-1
Balance ID, if this is switched on
Method : Boost/100C
Method ID, if this is switched on
Number : 1
Measurement series counter, if this is
switched on
Heat mode : Boost
Temperature : 100 C
Stop time : 10.0 Min
A
utostop : 2/20 D/s
Standby temp. : 40 C
Dryer setup, if this is switched on
Original weight : + 2.186 g
Starting weight is always output
Mode Temp Time 100-0%
--------------------------------------------------
B 105 C 1.0 Min + 86.81 %
B 140 C 2.0 Min + 68.08 %
B 140 C 3.0 Min + 51.97 %
102 C 4.0 Min + 44.05 %
98 C 5.0 Min + 37.70 %
100 C 6.0 Min + 29.84 %
100 C 7.0 Min + 24.38 %
100 C 8.0 Min + 22.64 %
END100 C 8.2 Min + 22.60 %
The measurement is printed in the unit set
for drying, provided the print rate function
is switched on.
The individual values are separated by
tabs in the "MODE PC".
100-0% : + 22.60 %
Residual weight : + 0.494 g
Stop : Autostop
Duration : 8.2 min
Drying results are always output
Operator : SAMPLE
Operator ID, if this is switched on
MRS-BA-defsi-0410 100
4.4.4 Configuring the application menu
• SET
APP.
MENU
EDIT METHOD ON/OFF
METHOD-ID
ON
/OFF
TARGET WEIGHT
ON
/OFF
UNIT
ON
/OFF
PRINT RATE ON/OFF
STANDBY TEMP.
ON/OFF
AUTOSTART ON/OFF
The options activated under "SET APP. MENU" are enabled in the
application menu and can be changed and set there (see chapter
4.5 "Application menu operation").
4.4.5 Balance calibration
• SET
BALANCE
CAL.
MODE OFFdisabled
MODE
EXTERNA
L
external
MODE EXT.-DEF.external with a freely defined
weight (DEF. n.nnn g)
DEF. 0.0000 gCalibration weight for the
EXT. DEF. mode
For details about calibrating the balance (see chapter 3.8"Weight
calibration").
4.4.6 Temperature calibration
• TEMP. CAL.
TEMP. CAL. ON/
OFF
Activate the temperature calibration
In order to calibrate the temperature (see chapter 7.3.2
"Calibrating the temperature")
101
MRS-BA-defsi-0410
4.4.7 Interface functions
•
SET
INTERFACE
BAUDRATE 300
BAUDRATE
600
BAUDRATE 1200
BAUDRATE 2400
BAUDRATE 4800
BAUDRATE 9600
BAUDRATE 19200
Select the
baud rate
PARITY
7-EVEN-1STOP
PARITY 7-ODD-1STOP
PARITY 7-NO-2STOP
PARITY 8-NO-1STOP
Select the
parity
HANDSHAKE
NO
HANDSHAKE XON-XOFF
HANDSHAKE HARDWARE
Select the
handshake
function
The RS232/V24 interface on the instrument is matched to the
interface of a peripheral instrument with the aid of the interface
functions see chapter 6 "Data transfer")
.
4.4.8 Date and time
• SET
DATE AND TIME
DATE [DD.MM.YY]
TIME [HH.MM.SS]
FORMAT STANDARD/US
Set date
and time
NOTE
If a power failure occurs, the timer keeps running. If this doesn't
happen, this indicates that the instrument's backup battery has run
out and has to be replaced by KERN Customer Service.
MRS-BA-defsi-0410 102
4.4.9 Password protection
The two main menus and the drying parameters for the MRS 120-3
can be protected against unwanted changes by using a freely
selectable, fou r-digit password.
•
If the password protection is deactivated, any operator can
change the instrument settings.
•
If “medium” password protection is activated, the configuration
menu is protected against unwanted changes.
•
If “high” password protection is activated, the configuration
menu, the application menu and the drying parameters are
protected.
•
The disabled menu options and parameters can only be
changed again by deactivating the password protection, i.e. by
entering the correct password.
•
PASS-
WORD
PASSWORD
––––
DATA-PROTECTION OFF
DATA-PROTECTION MED
DATA-PROTECTION HIGH
No protection
The configuration menu
is protected
The configuration and
application menus, as
well as the drying parameters are protected
NEW PASSWORD _ _ _ _ Enter a new password
NOTE
The password protection is deactivated in the factory settings.
The preprogrammed password set in the factory is: 7 9 1 4
This password is the same for all KERN instruments and is always
valid, at the same time as a password selected by the operator.
Keep a record of your own password.
103
MRS-BA-defsi-0410
Procedure for activating the password protection:
• Activate the configuration menu
PASSWORD _ _ _ _
•
Keep pressing «
» until
•
"PASSWORD----" appears.
PASSWORD 0 0 0 0
•
Press «
». The first digit in
•
the password "- - - -" starts
•
flashing.
•
Keep pressing «
» until the first
digit in the password is correct.
PASSWORD 6 0 0 0
•
Press «
».
•
The second digit in the password
display starts flashing now.
PASSWORD 6 1 0 0
• Keep pressing « » until the
second digit in the password is
correct.
•
Repeat these steps for the other
two digits.
•
Once you have entered all four
digits, press «
».
•
Press «
».
•
DATA-PROTECT ION OFF
•
The current data protection status,
"DATA-PROTECTION OFF",
"DATA-PROTECTION MED" OR
"DATA-PROTECTION HIGH" is
now displayed.
•
Press «
».
DATA-PROTECTION
OFF
•
The display flashes.
•
Keep pressing «
» to change
the password status.
DATA-PROTECTI O N MED
•
Press «
» to save the entry.
MRS-BA-defsi-0410 104
Procedure for changing the password:
• Enter the password and press
«
».
DATA-PROTECTI O N MED
•
The current data protection
status is now displayed.
•
Press «
».
new PASSWORD 6 1 0 0
• Enter the new password,
• (e.g. 6123, procedure as
described above).
new PASSWORD 6 1 2 3
• Press «
» to save the entry.
4.4.10 Anti-theft encoding
The instrument can be protected against theft by using a freely
selectable, four-digit numerical code:
•
If the anti-theft code is deactivated, the instrument can be
switched on again and operated after a power cutoff without
having to enter a code.
•
If the anti-theft code is activated, the instrument asks for the
code to be input after each power cutoff.
•
If the code is entered incorrectly, the instrument is blocked.
•
If the instrument is blocked, it must first be disconnected
from the power supply, then reconnected and unblocked by
entering the correct code.
•
After seven consecut i ve incorrect ent ries, the display reads
“NO ACCESS, CALL SERVICE”. In this case only a KERN
service engineer can unblock the instrument again.
NOTE
The anti-theft encoding is deactivated in the factory settings.
The
preprogrammed code
set in the factory is:
8 9 3 7
This code is the same in all KERN instruments. Therefore, for
security reasons enter your own code.
Keep your
own code
in a safe place.
105
MRS-BA-defsi-0410
• THEFTCODE
THEFTCODE ––––
THEFT-PROTECTION ON/
OFF
Switch encoding
on/off
NEW CODE –––– Enter a new code
In order to activate the anti-theft encoding, follow the same steps
described for password protection.
4.4.11 Key tone
• KEY TONE
KEY TONE
ON
/OFF Switch key tone on and off
If the key tone is switched on, a short audio signal is sounded each
time a key is pressed.
MRS-BA-defsi-0410 106
4.5 Application menu operation
This section explains the structure of the application menu and its
functions.
The structure of the application menu is dynamic and can be
defined in the configuration menu (see chapter 4.4.4 "
Configuring
the application menu
")
If a menu option is disabled in the configuration menu, it is not
contained in the current application menu.
•
The menu option "
RECALL METHOD
" cannot be switched
on/off, it is ever present in the application menu.
Main path Definable functions
RECALL METHOD Load a saved method
STORE METHOD Save a method
CLEAR METHOD
Delete a saved method
METHOD Enter the name of a method
SET TARGET WEIGHT
Definition of starting weight help
UNIT Selection of the drying unit
PRINT RATE
Enter the interval time for the print rate
Only if „PRINT RATE“ is also set in
printformat
STANDBY TEMP.
Definition of the standby temperature
function
AUTOSTART Definition of the autostart function
Representation conventions:
•
The settings programmed in the factory are depicted in
bold
.
•
In order to aid clarity, the only part of the menu tree shown in
each function description is the part which relates to the
application in
question.
Explanations on the menu functions are depicted in italics.
107
MRS-BA-defsi-0410
4.5.1 Activating the application menu
• Press «MENU» following the start-up process in order to get to
the application menu.
4.5.2 Methods
The MRS 120-3 supports the saving of five different methods. One
method comprises t h e se t tings for the drying program and the
starting weight help.
The following data is saved for each method :
•
Name of the method
•
Drying program with:
-
Drying mode
-
Drying temperature
•
Stop time
•
Autostop
• Autostart setting
•
Standby temperature
•
Unit for the result
•
Starting weight with:
•
Nominal weight
-
Upper weight limit
-
Lower weight limit
If the dryer is in weighing mode and the current starting weight is
lower than the minimum sample weight (< 0.2 g), the name of the
method currently loaded is displayed in the info line.
If the entry "EDIT METHOD" is switched off in the configuration
menu under "Set application menu"( see chapter 4.4.4 "Configuring
the application menu"), the menu options "STORE METHOD" and
"CLEAR METHOD" are no longer active. Consequently, the
methods saved are protected against changes or can only be
processed with existing saved method s.
All the current methods and their settings can be printed by keeping
the "PRINT" key pressed in until "PRINT APPLICATIONS" appears
(see chapter 4.6.2"The print key").
MRS-BA-defsi-0410 108
4.5.2.1 Saving a method
• STORE METHOD
STORE METHOD Save a method
Procedure for saving a method:
•
Set the drying parameters and the
starting weight for the required
method and enter a name for the
method.
•
(see chapter 4.5.2 "Methods“)
•
Activate the application menu by
pressing the «MENU» key briefly.
STORE METHOD
•
Keep pressing «
» until
•
"STORE METHOD" appears.
•
Press «
».
If the method can be saved, you exit
the menu automatically, and the
dryer switches back to weighing
mode.
The method cannot be saved if the name has already been used
for an existing method in the memory:
•
REPLACE METHOD YES/NO"
appears.
•
Using the «
» key, select "YES" if
you wish to replace the existing
method or "NO" if you wish to enter a
different name for the new method.
REPLACE METHOD yes
or
•
Press «
».
The method is saved. The dryer
switches to weighing mode.
REPLACE METHOD no
•
Press «
».
The name of the method must be
changed.
109
MRS-BA-defsi-0410
Method TEST
•
Enter the new name for the
method using the «
», « »,
«
» and « » keys.
•
Press «
». The method is
saved. The dryer swit ches to
weighing mode.
If all 5 memory slots are occupied, you won't be able to save a new
method. In other words, you will have to delete one of the old
methods first.
4.5.2.2 Loading a method
• RECALL METHOD
RECALL METHOD ttt...
ttt...
ttt...
ttt...
ttt...
Select a method
Only the existing methods are
displayed!
Only methods currentl y saved are displayed in the menu. If no
methods are saved, you cannot go to the "RECALL METHOD"
menu.
If you press the «E» key, the selected method is loaded, and the
dryer switches back to the weighing mode.
4.5.2.3 Deleting a method
• CLEAR METHOD
CLEAR METHOD ttt...
ttt...
ttt...
ttt...
ttt...
Select a method
Only the existing methods
are displayed!
Only methods currentl y saved are displayed in the menu. If no
methods are saved, yo u cannot go to t he "CLEAR METHOD"menu.
If you press the «E» key, the selected method is deleted, and the
dryer switches back to the weighing mode.
NOTE
A saving sequence can be cancelled at any time by pressing «esc».
MRS-BA-defsi-0410 110
4.5.2.4 Setting method name
• METHOD
METHOD ttt... Enter the name for the method
4.5.3 Starting weight
• SET
TARGET
WEIGHT
WEIGHT CHECK ON/OFF
Switch check on/off
NOMINAL
5.000 g
UPPER LIMIT 6.000 g
LOWER LIMIT
4.000 g
Enter nominal weight
Define upper limit
Define lower limit
With the aid of the «TARGET WEIGHT», you can weigh the sample
exactly to check that it m atches a defined reference value
plus/minus permissible deviations.
"+", "–" and «
» are active in the display.
If «
» lights up, this indicates that the measurement lies within
the defined tolerances, and the drying process can commence. If
the sample weight lies outside the starting weight tolerance, the
drying process cannot be activated. In this case the starting weig ht
tolerances are displayed on the screen as an error message.
4.5.4 Units
• UNIT
UNIT 100-0%
0-100%
ATRO 100-999%
ATRO 0-999%
G/KG
RESIDUAL WEIGHT
WEIGHT LOSS
BALANCE WEIGHT
The unit of the measurement results printed in the report can be
selected in the «UNIT» menu option. The defined unit is also used
to print out interim values. The unit of measurement for the printout
can only be changed before, and not during, a measurement.
The unit selected is also used as the display unit, although it can
also be adjusted during and after the measurement . (see chapter
4.6.3"The change key")
111
MRS-BA-defsi-0410
Description/calculation of the units
Explanation of the variables used
•
MW: Moist weight (weight value at the start of the
measurement)
•
DW: Dry weight (weight value at the end of the
measurement)
Unit Calculation
Dry mass in percent:
100 - 0%
DW
MW
---------- -
100%⋅=
Moisture in percent:
0 - 100%
MW DW–
MW
-------------------------
100%⋅–=
ATRO dry mass:
ATRO 100 - 999%
MW
DW
---------- -
100%⋅=
ATRO moisture:
ATRO 0 - 999%
MW DW–
DW
---------------------------
100%⋅–=
Residual weight in g / kg [‰]:
g / kg
DW
MW
-----------
1000⋅=
Residual weight in g:
RESIDUAL WEIGHT D W=
Moisture in g:
WEIGHTLOSS MW DW–=
Current balance weight in g:
BALANCEWEIGHT NETWEIGHT=
Explanations for the ATRO units
The ATRO unit is required exclusively in the wood industry.
In practice, wood contains different amounts of water, which can
change continuously. The water content affects the combustion
performance of the wood and the heat value. The water evaporates
during drying. When wood is stored in the open air, it reaches the
so-called air-dried status (A.D.) of 15% to 20% water content. The
moisture is completely removed from the wood by heating the wood
to temperatures over 100°C. This condition is called absolutely dry
(abs.dry).
The wood moisture (ATRO) is the amount of water contained in the
wood, expressed in terms of the percentage of the mass of the
water-free wood and is calculated from the difference between the
fresh weight (MW) and the dry weight (DW).
MRS-BA-defsi-0410 112
4.5.5 Print rate
• PRINT RATE
PRINT RATE
1.0
MIN Print rate interval
The interval at which interim results are printed is set at "PRINT
RATE". The print interval can be set in 0.1 min increments from
0.1 ... 10.0 min.
4.5.6 Standby temperature
• STANDBY TEMP.
STANDBY TEMP. ON/
OFF
Switch standby temperature on/off
TEMPERATURE 40°C Temperature value, only if the standby
temperature is switched on
Adjusts the temperature in the sample chamber to the set
temperature, provided the sample chamber is closed. The
temperature range available is 30°C ... 100°C. A flashing circle in
the display indi ca tes the stanby temperature is not reached, yet.
4.5.7 Autostart
• AUTOSTART
AUTOSTART ON/OFF
If autostart is switched on, the measurement is started as soon as
the sample chamber is closed. This is provided that the moisture
analyzer is prepared for a new measurement.
113
MRS-BA-defsi-0410
4.6 Special operating keys
4.6.1 The tare key
–
Ensure that there is no drying taking place, i.e. that the
instrument is in weighing mode.
• Activating taring
–
Press «
TARE
» briefly.
– A taring procedure is performed.
• Activating calibration
– Keep «TARE» pressed until "BALANCE CALIBRATION" is
displayed.
– Release «TARE».
–
The balance carries out a calibration in accordance with the
settings in the configuration menu and logs these in the form of
a printout (see chapter 4.4.5"Balance calibration" and chapter
7.3.1 “Calibrating the balance”)
• Activating a calibration test
– Keep «TARE» pressed until "TEST CALIBRATION" is
displayed.
– Release «TARE».
–
A calibration test is performed on the balance.
• Activating a temperature calibration
– Keep «TARE» pressed until "TEMP. CALIBRATION" is
displayed.
– Release «TARE».
–
The MRS 120-3 moisture analyzer carries out a temperature
calibration and logs it in the form of a printout (see chapter
4.4.6"Balance calibration" and chapter 7.3.2 “Calibrating the
balance”).
• Activating a temperature calibration test
– Keep «
TARE
» pressed until "TEST TEMPERATURE" is
displayed.
– Release «
TARE
».
– The MRS 120-3 moisture analyzer carries out a temperature
test.
MRS-BA-defsi-0410 114
NOTE
The special functions of the tare key are only active if they are
switched on in the configuration menu.
A calibration or a calibration test procedure can be interrupted by
pressing «ON/OFF». This applies both to the balance and to the
temperature.
4.6.2 The print key
–
Ensure that there is no drying taking place, i.e. that the
instrument is in weighing mode.
•
Printing out an individual value or a report
– Press «PRINT» briefly.
– The drying report is printed out. The report for the last
measurement can be printed out at the start of a new drying
procedure. Reports printed afterwards do not contain any
interim results. It is otherwise identical to the drying report
which is printed during the measurement. If no drying has been
performed since the instrument was started up, the weight
value is printed.
• Resetting thecounter to 1
– Keep «
PRINT
» pressed until "RESET COUNTER" is displayed.
– Release «PRINT».
–
The counter is reset to 1.
•
Printing the instrument settings
– Keep «PRINT» pressed until "PRINT STATUS" is displayed.
–
Release «
PRINT
». The instrument settings are printed.
115
MRS-BA-defsi-0410
Status :
--------
Status printout for the settings.
Date 07.10.2002 Time 16:12:39
Name : MRS 120-3
Software : N50-0040 P00
Serialno : 3300-1
Instrument identification
Print :
Printformat :
Date and Time : on
Balance-ID : on
Method-ID : on
Counter : on
Dryer Setup : on
Print rate : off
Operator-ID : off
Print rate : 1.0 min
Operator :
Mode : Printer
Report printout settings
Calibration :
Mode : external
Defined weight : 0.0000 g
Balance calibration settings
Temp. cal. : off
Temperature calibration settings
Interface :
Baudrate : 9600
Parity : 7-even-1stop
Handshake : Hardware
Interface settings
Data-protection : off
Theft-protection : off
Security settings
Key tone: on
Key settings
•
Printing the application settings
– Keep «
PRINT
» pressed until "PRINT APPLICATIONS" is
displayed.
– Release «
PRINT
».
– The application settings and all the settings for the methods
currently saved are printed.
MRS-BA-defsi-0410 116
Applications :
--------------
Printout of the application settings and
methods.
Dryer setup :
Heat mode : Standard
Temperature : 105 C
Timer stop : off
Time : 10.0 min
Auto stop : 2/20 D/s
Free : 1/20 D/s
Autostart : off
Standby Temp : off
Temperature : 40 C
Unit : 100-0%
Current drying parameter settings
Targe weight :
Weight check : off
Nominal : 5.000 g
Upper limit : 6.000 g
Lower limit : 4.000 g
Current starting weight settings
Method : TEST Soft
Dryer setup :
Heat mode : Soft
Temperature : 100 C
Timer stop : on
Time : 25.0 min
Auto stop : off
Free : 1/20 D/s
Autostart: off
Standby Temp : on
Temperature : 40 C
Unit : 100-0%
Weight check : off
Nominal : 6.000 g
Upper limit : 7.000 g
Lower limit : 5.500 g
Settings for the first method
Method : TEST Boost
Dryer setup :
Heat mode : Boost
Temperature : 140 C
Timer stop : off
Time : 10.0 min
Auto stop : AdaptStop
Free : 1/20 D/s
Autostart: :off
Standby Temp : off
Temperature : 40 C
Unit : 100-0%
Weight check : off
Nominal : 3.500 g
Upper limit : 4.000 g
Lower limit : 2.500 g
Settings for the second method
(all the methods saved are printed)
etc....
If methods three to five exist, they are
also printed.
117
MRS-BA-defsi-0410
4.6.3 The change key
• Changing units
– If drying has already been performed or is under way, the unit of
measurement displayed can be changed using the change key
«
». Once a drying procedure is ended, the drying result can
be displayed in all the available units until the start of a new
drying sequence using the change key «
».
–
Release «
» once the unit to which you wish to change is
displayed
.
4.6.4 The start/stop key
•
Starting drying manually
– Ensure that there is no drying taking place, i.e. that the
instrument is in weighing mode.
– Press «
START/STOP
» briefly.
– The measurement is started.
• Stopping drying manually
– Drying is under way.
– Press «START/STOP» briefly.
–
The measurement is stopped.
MRS-BA-defsi-0410 118
5 Determining moisture levels
The MRS 120-3 moisture analyzer is used as a quick and reliable
means of determining the moisture content in powders and liquids
by the thermogravimetric process.
5.1 Fundamental principles
The term moisture does not just relate to water, it also
encompasses all substances which evaporate when they are
heated. Alongside water, they also include
–
fats
–
oils
– alcohol
– solvents
– etc...
There are different techniques for determining the moisture of a
material.
Thermogravimetry is the technique used in the MRS 120-3. In this
technique, the sample is weighed before and after heating so as to
determine the moisture content from the difference.
The conventional drying oven technique works on the same
principle except that, the measurement takes much longer. In the
drying oven technique, the sample is heated from the outside
inwards by a stream of hot air so as to draw out the moisture.
In the case of the halogen radiation used in the MRS 120-3, the
radiation mainly penetrates into the sample where it is converted
into heat energy, heating the sample from the inside out. A small
portion of the halogen radiation is reflected by the sample; this
reflection is lower in dark samples than in light samples. The
penetration depth of the halogen radiation depends on the
permeability of the sample. In the case of low-permeability
samples, the halogen radiation only penetrates into the upper
layers of the sample, which may lead to incomplete drying, charring
or combustion. Consequently, the sample preparation is extremely
important.
119
MRS-BA-defsi-0410
5.1.1 Adjusting to the existing measuring
process
The MRS 120-3 moisture analyzer is frequently used in place of
other drying techniques (like the drying oven) because it is easier to
operate and offers shorter measuring times. Consequently, the
conventional measuring process has to be adapted to the MRS
120-3 so that comparable results can be achieved.
•
Performing a parallel measurement
Lower temperature setting in the MRS 120-3 than in the drying
oven technique
•
The result achieved with the MRS 120-3 does not match the
reference
– Repeat the measurement with a changed temperature setting
–
Vary the switch-off cr i t e rio n
•
Adapting with the calibration curve or factor
5.2 Sample preparation
Prepare one sample at a time for measurement. This prevents the
sample exchanging moisture with the ambient surroundings. If a
number of samples have to be taken simultaneously, they should
be packed in air-tight containers so as to ensure that they do not
change while they are in storage.
Distribute the samp le
evenly
and
thinly
on the weighing pan in
order to achieve reproducible results.
If it is applied unevenly, this causes an inhomogeneous distribution
of heat in the sample being dried, resulting in incomplete drying or
an extension to the measuring time. If the sample is piled up, it
heats up with greater intensity in the upper layers, causing
combustion or encrustation to occur. The high layer thickness or
possible formation of a crust prevents the moisture from escaping
from the sample. This residual moisture means that measurement
results achieved this way are not verifiable and reproducible.
Solids:
•
Distribute powder samples evenly on the weighing pan.
•
Make course samples smaller using a mortar or grinder. Do not
expose the sample to any heat while you are grinding it as this
will lead to a loss of moisture.
MRS-BA-defsi-0410 120
Liquids:
•
You are advised to use a fiber glass filter for liquids, pastes or
slurry samples. The fiber glass filter offers the following
advantages:
– even distribution on account of the capillary effect
– no formation of drops
– quick evaporation due to the larger surface
5.2.1 Preventing samples being encrusted
In order to avoid the sample becoming encrusted, solvent can also
be added to the sample after the measurement has started. The
solvent added has no bearing on the final result of the
measurement.
•
Start the measurement, automatically or by pressing the
«
START/STOP
» key.
•
The dryer hood can be opened again within 5 seconds of the
start. During this time, the words "START DRYING" are
displayed in the info line of the display.
•
After opening the sample chamber, you can add additional
solvent at any time until the hood is closed. Once the dryer
hood is closed, the measurement is continued. "START
COVER CLOSE" appears in the info line in the display. If you
press the «START/STOP» key, the measurement is
interrupted.
NOTE
The additional solvent is taken into account in the measurement
printout because all the interim values are calculated on the basis of
the current weight value.
However, it has no bearing on the drying result because the solvent
has completely dried off.
121
MRS-BA-defsi-0410
5.3 Setting drying parameters
The drying parameter setting procedure is started with the four
function keys under the display.
Each of the four function keys starts the entry of the corresponding
drying parameter. The parameters are entered or changed in the
same way as the menu operation procedure ( except that only the
current parameter can be changed each time.
5.3.1 Heating program
This function key is used to start the heating program selection.
There are three heating programs available for determining the
moisture content:
•
Standard drying
•
Boost drying (0.1Min – 99.9Min)
•
Soft drying
• HEATING PROGRAM
HEAT MODE STANDARD
BOOST
SOFT
Select the heating program
BOOST-time selectable*
* The BOOST-Time can be set in 0.1 min increments from 0.1 min
... 99.9 min.
Standard drying
The drying temperature is predefined by the user. The end
temperature is started up with a high heat output and is kept
constant with slight overshooting.
This program is used for most sa m p les.
MRS-BA-defsi-0410 122
Boost drying
The drying temperature is predefined by the user. During the
selected time (0 .1Min-99.9Min) of drying, the target temperature is
exceeded by 40%. Once this time has elapsed, the temperature is
adjusted down to the target temperature. The temperature is
started up with a high heat output.
The maximum temperature reached during the boost is 230°C.
This program is used for samples with a very high moisture
content.
Soft drying
The drying temperature is predefined by the user. The end
temperature is started up gently with a low heat output. The end
temperature is reached after approx. 4 minutes.
123
MRS-BA-defsi-0410
This program is used for samples with a low moisture content in
which there is a risk of combustion.
5.3.2 Temperature
This function key is used to start the drying temperature input.
The drying temperature can be entered in 1°C increments from
30°C ... 230°C.
After 10 minutes temperatures higher than 200°C are automatically
adjusted down to 200°C over the course of the next 20 minutes.
•
DRYING TEMPERATURE
TEMPERATURE
105
°C Temperature input
The temperature setting for drying with the MRS 120-3 is lower
than in the case of drying with the drying oven technique.
5.3.3 Timer stop
This function key is used to define the drying time.
If the timer stop is switched on, the measurement procedure is
ended once the time set has elapsed.
The time can be set in 0.1 min increments from 0.1 min ... 240.0
min.
• DRYING TIME
STOP TIME
10.0
MIN Only if the timer stop is switched on
TIMER STOP ON/
OFF
MRS-BA-defsi-0410 124
5.3.4 Switch-off criteria
This function key is used to start the definition of the switch-off
criteria for the measurement.
One firmly and 2 freely definable stop mode are availlable.
There is also the automatic stop mode "ADAPTSTOP".
– Digit / Time (selectable)
–
Prozent / Time (selectable)
– ADAPTSTOP
• STOPMODE
AUTOSTOP
OFF
Digit / Time
Percent / Time
ADAPTSTOP
Switch-off criterion Digit per time
The drying procedure is switched off as soon as the reduction in
weight, during the time set, is smaller than the number of digits set.
The reduction in weight must have been greater than the switch-off
criterion at some point.
In the freely definable mode, the user can set from 1 ... 99 digits in
1 digit increments and from 10...90 seconds in 10 second
increments.
Switch-off criterion percent per time
The drying procedure is switched off as soon as the reduction in
weight, during the percent set, is smaller than the number of digits
set. The redu ction in weight must have been greater than the
switch-off criter io n at some point.
In the freely definable mode, the user can set from 1 ... 99 digits in
1 digit increments and from 10...90 seconds in 10 second
increments.
125
MRS-BA-defsi-0410
One digit is the smallest change in measurement that can be
displayed by the moisture analyzer.
In the MRS 120-3: 1 digit = 1 mg
ADAPTSTOP
Is a fully automatic stop mode which determines the switch-off time
on the basis of the drying progress.
5.4 Application table (recommendations)
Preparation of the standard sample:
-
Distribute the sample evenly on the aluminium tray.
-
Reduce the sample to small pieces and distribute evenly
on the aluminium tray.
Preparation of special samples:
-
A glass fibre filter can be used if the test material is
sensitive
or difficult to distribute (e.g. mercury).
-
Apply the sample evenly to the glass fibre filter and cover
with a second glass fibre filter.
-
The glass fibre filter can also be used for protection against
material splashes (every splash adulterates the final
result).
MRS-BA-defsi-0410 126
MATERIAL
Weight of test
item
(g)
Drying
temperature
(º C)
% humidity or
% solid body
Standard
divergence
Drying time
(min)
Dry piece of
apple
5-8 100 76.5 0.1 10-15
Moist apple
5-8 100 7.5 5-10
Butter
2-5 138 16.3 0.1 4.5
Mustard
2-3 130 76.4 0.7 10
Ground coffee
2-3 106 2.8 0.1 4
Cornflakes
2-4 120 9.7 5-7
Yogurt
2-3 110 86.5 4.5-6.5
Powdered coffee
cream
2-3 130 78.5 0.1 6-8
Cocoa powder
2-3 106 0.1 0.1 2
Crisps
3-4 106 6.9 0.1 7.5
Margarine 3-4 138 16 0.1 10
Mayonnaise
1-2 138 56.5 0.4 10
Powdered milk
2-4 90 5 0.2 6
Milk chocolate
2-5 106 1.3 0.1 3.5
Red wine 3-5 100 97.4 0.1 15-20
Chocolate
powder
2-4 100 1.9 0.1 4
Sunflower oil
10-14 138 0.1 2
Instant soup
powder
2-3 80 3 0.2 4.5-7
Sugar 4-5 138 11.9 0.1 10
Milk
2-3 120 88 0.2 6-8
Flour
8-10 130 12.5 0.1 4-5
Cement 8-12 138 0.8 0.1 4-5
Paper
2-4 106 6.4 0.1 10
Sludge
11-12 130 80 90
Polyamide
2-5 138 2 0.2 75
Dust 5-10 104 7.3 0.3 8-15
Charcoal 8-10 120 3.8 0.1 8-10
127
MRS-BA-defsi-0410
6 Data transfer
The MRS 120-3 moisture analyzer is equipped with an RS232/V24
interface for data transfers to peripheral instruments.
Before the data transfer, the R S 232 in te rfac e mu s t be ma tc hed w ith
the one in the peripheral instrument in the instrument's
configuration menu
(see chapter 4.4.7"Interface functions").
• Handshake
The handshake is set in the factory to "NO". It can be set to
software handshake XON/XOFF or to hardware handshake.
•
Baud rate
Possible baud rates: 300, 600, 1200, 2400, 4800, 9600 or
19200 baud.
•
Parity
Possible parity: 7-even-1 stop, 7-odd-1 stop, 7-no-2 stop or
8-no-1 stop.
± 12 V
SB 1 2 3 4 5 6 7 8 SP
7-even-1
SB
1.
DA
2. DA3. DA4. DA5. DA6. DA7.
DA
PB SP
7-odd-1
SB
1.
DA
2. DA3. DA4. DA5. DA6. DA7.
DA
PB SP
7-no-2
SB
1.
DA
2. DA3. DA4. DA5. DA6. DA7.
DA
1. SP 2. SP
8-no-1
SB
1.
DA
2. DA3. DA4. DA5. DA6. DA7.
DA
8.
DA
SP
SB: Start bit PB: Parity bit
DA: Data bit SP: Stop bit
– Display
S D7 D6 D5 D4 D3 D2 D1 D0 U U U
–
Data transfer takes place in ASCII code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ... ... ...
B B B S D7 D6 D5 D4 D3 D2 D1 DP D0 B U ... CR LF
MRS-BA-defsi-0410 128
B Blank (space)
S Prefix (+,–, space)
DP Decimal point
D0...D7 Digits
U ... Unit (only if the weight is stable, otherwise no unit is sent)
CR Carriage return
LF Line feed
NOTE
Unused positions are filled with spaces.
The decimal point DP can be between D0 and D7.
6.1 Connection scheme
– Standard duplex connection
MRS 120-3 RJ 45 D25 / D9 Peripheral instrument
RS 232 out 2 3 / 2 RS 232 in
RS 232 in 6 2 / 3 RS 232 out
GND 5 7 / 5 GND
•
Standard duplex connection with additional hardware
handshake in the peripheral instrument
MRS 120-3 RJ 45 D25 / D9 Peripheral instrument
RS 232 out 2 3 / 2 RS 232 in
RS 232 in 6 2 / 3 RS 232 out
GND 5 7 / 5 GND
CTS 3 20 / 4 DTR
DTR 7 5 / 8 CTS
129
MRS-BA-defsi-0410
•
Pin configuration of the RJ45 socket
MRS 120-3 RJ 45 Remark
n.c. 1 Not connected
RS 232 out 2 Out (V24)
CTS 3 In (V24)
VDC 4 Out (9 ... 16V)
GND 5 0V
RS 232 in 6 In (V24)
DTR 7 Out (V24)
EXTBUS 8 In (5V, logic)
6.2 Remote control commands
Command Function
ACKn
Acknowledge n=0 off; n= 1 on
CAL Start calibration (only if EXT is selected)
DN Reset weight display
D .......... Describe weight display (right-aligned)
@N Re se t inf o di sp lay
@ ......... Describe info display
N Reset instrument
OFF Switch off instrument
ON Switch on instrument
PCxxxx Enter anti-theft code
PDT Print date and time
PRT Start printing (Press «PRINT» key)
PST Start print status
Pn (ttt.t) Set print mode
n = 0 Individually print each valu (unstable)
n = 1 Individually print a stable value (stable)
n = 2 Print after change of load
n = 3 Print after each integration period
n = 4 Print with time basis in s (ttt.t)
SDTttmmjj
hhmmss
Set date and time (German: Tag, Monat, Jahr,
Stunde, Minute, Sekunde)
MRS-BA-defsi-0410 130
Command Function
SDTmmddyy
hhmmss
Set date and time (Month, Day, Year, Hour, Minutes,
Seconds)
T (ttt) Tare or set tare to a specific value
ZERO
Set instrument to 0 (if weight is stable and within the
zero setting range)
Rttt
Adjusts the heating to the required temperature
(30°C ... 230°C)
ROFF Switch off heating
PWT (ttt.t)
Print weight value and temperature value
Print with time basis in s (ttt.t)
(switch off by transmitting PWT)
NOTE
Each remote control command must t erminate with «CR» «LF».
The commands are acknowledged if required.
6.2.1 Examples of the remote control of the instr.
Input Description of the function activated
D – – – – – Five dashes are displayed
DTEST123 tESt123 is displayed
D The display is dark
T10 -10.000 g (Tare set to = 10 g)
T1 -1.000 g (Tare set to = 1g)
T Instrument is tared
R100 Adjusts the temperature to 100 °C
131
MRS-BA-defsi-0410
7 Service
7.1 Maintenance and servicing
The MRS 120-3 moisture analyzer must be treated carefully and
cleaned regularly. This is a precision instrument
DANGER
To facilitate maintenance work, the instrument must be disconnected
from the power supply. Also ensure that the instrument cannot be
reconnected to the power supply during the work by anyone else.
Take care during cleaning that no liquid gets into the instrument. If
you spill any liquid onto the instrument, unplug it from the electrical
supply immediately. Do not operate the MRS 120-3 moisture
analyzer again until you have had it checked by a KERN service
engineer.
The connection ports on the back of the instrument may not come
into contact with liquids.
Regularly dismantle the weighing pan and the weighing pan holder
and remove any dirt or dust from under the weighing pan and on
the balance housing with a soft brush or a soft, lint-free cloth,
moistened with a mild soap solution.
The balance pan and the holder can be cleaned under running
water. Take care to ensure that both parts are completely dry
before they are re-installed on the balance.
CAUTION
Never use solvents, acids, alkalis, paint thinners, scouring powders
or other aggressive or corrosive chemicals for cleaning since these
substances attack the surfaces of the instrument housing and can
cause damage.
Regular maintenance of the MRS 120-3 moisture analyzer by your
KERN service agent will guarantee unrestricted functioning and
reliability over many years and will extend the lifespan of the
instrument.
MRS-BA-defsi-0410 132
7.2 Replacing the mains fuse
If the display remains dark after you switch o n the instrument, this
generally means that the instrument's fuse is faulty and has to be
changed.
DANGER
Unplug the instrument from the mains before replacing the
fuses.
Screw open the fuse holder on
the back of the instrument using
a screwdriver, screwing
anticlockwise.
Replace the faulty fuse:
230 volt variant:
T 3.15 A, 230 V, 5x20 mm
115 volt variant:
T 6.3 A, 115 V, 5x20 mm
If the instrument still does not
work after replacing the fuse,
contact the KERN Service
Center.
DANGER
Under no circumstances should you use other fuses or attempt
to bridge the fuse.
133
MRS-BA-defsi-0410
7.3 Calibration
The calibration of the MRS 120-3 moisture analyzer is defined in
the configuration menu (see chapter 3.8"Weight calibration" and
chapter 4.4.5 “Balance calibrati on ”) .
NOTE
The balance calibration and the temperature calibration can be
interrupted at any time by pressing «ON/OFF».
7.3.1 Calibrating the balance
Possible types of balance calibration:
– External calibration by means of ICM (Intelligent Calibration
Mode)
– External calibration with a freely definable weight
External calibration by means of ICM
Calibration weights in increments of 10g can be used for the MRS
120-3 moisture analyzer whereby the calibration weights must
correspond to the precision of the instrument.
"SET CALIBRATION MODE EXTERNAL" must be set in the
configuration menu (see chapter 4.4.5"Balance calibration") for
external calibration by means of ICM.
•
Ensure that there is no drying
taking place, i.e. that the
instrument is in weighing mode.
Balance calibration
• Keep pressing «TARE» until
•
"BALANCE CALIBRATION" is
displayed.
- - 0000 9
•
The instrument performs a zero
point measure (0000 g is
displayed flashing).
- - 50 9
•
After the zero point
measurement, the display
flashes the recommended
calibration weight.
•
Put the calibration weight on.
MRS-BA-defsi-0410 134
- - 50 9
•
The display flashes.
+ 50 9
•
Once the display stops
flashing,this indicates that the
calibration has ended.
External calibration with a freely definable weight
"SET CALIBRATION MODE EXT.-DEF." must be set in the
configuration menu (se chapter 4.4.5 “Balance calibration”) for
external calibration with a freely definable weight.
You then need to enter the effective value of the calibration weight
(DEF. n,nnnn g) with up to ten times the precision of the instrument
balance.
NOTE
Is calibrated with the free weight, so only this weight may be used.
Procedure to follow:
•
Ensure that there is no drying
taking place, i.e. that the
instrument is in weighing mode.
Balance calibration
•
Keep pressing «
TARE
» until
•
"BALANCE CALIBRATION" is
•
displayed.
- - 0000 9
•
The instrument performs a zero
point measure (0000 g is
displayed flashing).
- - 22 9
•
After the zero point
measurement the display
flashes the calibration weight
entered beforehand.
• Put the calibration weight on.
- - 22 9
•
The display flashes.
+ 22.150 9
•
Once the display stops
flashing, this indicates that the
calibration has ended (the
precise value is displayed).
135
MRS-BA-defsi-0410
Calibration report printout
Calibration
------------
Balance calibration report
Date 16.10.2003 Time 12:51:36
Name : MRS 120-3
Software : N50-0000 P00
Serialno : 3300-1
Time of the calibration and instrument data
Calibration o.k.
Status of the calibration
Operator :
Operator ID, if activated under Set Print
Format (see chapter 4.4.3
Configuring
the report printout
”).
7.3.2 Calibrating the temperature
In order to enable a temperature calibration to take place,
"TEMP. CAL." must be switched on in the configuration menu (see
chapter 4.4.6 "Temperature calibration").
The temperature adjustment set must be connected to the moisture
analyzer via the RS232 interface, and the temperature sensor must
be inserted in the sample chamber.
Procedure to follow:
•
Ensure that there is no drying
taking place, i.e. that the
instrument is in weighing mode.
temp. CALIBRation
•
Keep pressing «
TARE
» until
• "TEMP. CALIBRATION" is
• displayed.
Press STart-KEY
•
Once the temperature
adjustment set is connected to
the instrument, press «
START
STOP».
TEMP 25°C 40.00 MIN
•
The temperature calibration is
started. The dryer heats up to
100°C. The temperature and
the time remaining for the
temperature calibration are
displayed in the info line. It
takes 20 minutes to heat up to
a temperature.
MRS-BA-defsi-0410 136
•
The temperature value is
transmitted to the instrument
from the temperature
adjustment set.
TEMP 100°C 20.00 MIN
•
It is heated to 160°C.
• The temperature value is
transmitted to the instrument
from the temperature
adjustment set.
•
Once the temperature
calibration has ended, the
report is printed.
Temperature calibration report printout
Temperature Calibration
-----------------------
Temperature calibration report
Date 16.10.2003 Time 12:51:36
Name : MRS 120-3
Software : N50-0000 P00
Serialno : 3300-1
Time of the calibration and instrument data
Temp. Reference ID : ...
Identifier of the temperature adjustment set
Temperature 100 C : 100 C
Temperature 160 C : 160 C
Status of the temperature calibration
Temperature Calibration o.k.
Instrument has been correctly temperaturecalibrated
Operator :
Operator ID, if activated under Set Print
Format (see chapter 4.4.3 Configuring the
report printout).
137
MRS-BA-defsi-0410
7.4 Software update via Internet
Downloads with Software updates are available from
the Internet .
http://www.mrs.kern-sohn.de
7.5 Error messages
The instrument displays an error description in the info line.
NOTE
If an error occurs without any corresponding description in the info
line, a KERN service engineer must be called
.
Error message
Cause
Starting value too small
•
The sample weight is too small
(<0.200 g). The sample weight must
be greater than 0.200 g.
LOWER LIMIT x.xxx g
UPPER LIMIT x.xxx g
• The sample weight does not lie
within the tolerance for the starting
weight.
7.4.1 Notes on correcting faults
Faults and their possible causes should be listed in the following
table. If you cannot clear the fault on the basis of the table, please
contact a KERN service engineer.
Fault
Possible causes
Weight display
does not light up
•
Instrument is not switched on
•
Mains cord is not plugged in
•
Mains fuse is faulty
"OL" is
displayed
•
The weight range has been exceeded
(observe the information on the maximum
weight range)
"UL" is
displayed
•
The weight range is below the range of the
instrument (weighing pan or pan holder
missing)
MRS-BA-defsi-0410 138
Fault
Possible causes
Results of
weighing are
clearly incorrect
•
The instrument has not been correctly tared
•
The instrument has not been correctly levelled
•
The calibration is no longer correct
•
Sharp temperature fluctuations occur
The weight
display changes
continuously
•
The draft is too strong at the location of the
instrument
• The instrument support is vibrating or
fluctuating
•
The weighing pan is touching a foreign body
•
The sample is absorbing moisture
•
The sample is
evaporating/vaporising/subliming
•
Sharp changes in temperature in the sample
Configuration
menu cannot be
changed
• The password lock is activated in the
configuration menu
The display
flashes
continuously
during
calibration
•
The instrument location is not quiet enough
(interrupt calibration with «ON/OFF» and
move the balance to a better location).
• Use of a calibration weight which is too
imprecise (only applies to external calibration)
The connected
printer won't
work
•
The printer is not switched on
•
The data cable is faulty or not connected
• The interface settings do not match the
moisture analyzer
The printer
prints incorrect
characters
•
The parity setting or the baud rate of the
interface don't match
•
The data cable is faulty
Drying won't
start
•
The sample is not stable
139
MRS-BA-defsi-0410
8 Overview
8.1 Technical data
Heat source, heater type Halogen
Weighing range [g] / Readability [g] 120 /0.001
Drying:
Readability [%] 0.01
Reproducibility in approx. 1g [%] 0.2
Reproducibility in approx. 10g [%] 0.02
Sample weight [g] 0.2 - 120
Result calculations: 100-0%, 0-100%
ATRO 100-999%,
ATRO 0-999%,
G/KG,
RESIDUAL, L O SS
Heating:
Temperature range [°C] / Increment [°C] 30 - 230 / 1
Heating methods Standard, Boost, Soft
Intervals Boost + 1 (1-99)
Booster +40% during selectable time
Switch-off criteria:
Autostop [d/s] 4 fixed settings or freely definable
1 - 99 / 10 - 90
Digit / Time
Percent / Time
Timer stop [min.] 0.1 - 240.0
Monitoring:
Viewing window x
Audio x
Printout:
GLP x
Printout - Interval [min.] 0.1 - 10.0
Sample numbering x
MRS-BA-defsi-0410 140
Memory capacity:
Methods (with all settings) 5
User texts 2
Operation:
"Easy access" sample holder x
Display VFD
Keypad 10 keys
Password protection x
Special features:
Initial weighing with limits / Initial weighing help x / x
Software download and update x
Calibration:
Balance with a test weight
Temperature, fully automatic at 100°C and 160°C
Miscellaneous:
Timer for date and time x
Interface for PCs and printers RS232
KERNBus x
Digital I/O optional
Anti-theft protection Code and mechanically
Connection:
Mains voltage 230V or 115V
Can be switched by changing the unit
of heat (may only be done by KERN
Service)
Mains frequency [Hz] 50 - 60
Power consumption [W] 450
Dimensions:
Instrument housing (WxHxD) [mm] 210x170x340
Weight [kg] 6.3
141
MRS-BA-defsi-0410
8.2 Configuration menu tree
«
MENU
» Key is pressed during switch-on:
• SET DATA PRINT
SET PRINTFORMAT DATE AND TIME
ON
/OFF
BALANCE-ID
ON
/OFF
METHOD-ID ON/
OFF
COUNTER
ON
/OFF
DRYER SETUP
ON
/OFF
PRINT RAT E ON/
OFF
OPERATOR-ID ON/
OFF
PRINT RATE
1.0
MIN
OPERATOR ttt...
MODE
PRINTER
MODE PC
•
SET APP. MENU
EDIT METHOD
ON
/OFF
METHOD-ID
ON
/OFF
TARGET WEIGHT
ON
/OFF
UNIT
ON
/OFF
PRINT RATE
ON
/OFF
STANDBY T EMP. ON/OFF
AUTOSTAR T ON/OFF
• SET
BALANCE CAL.
MODE OFF
MODE EXTERNAL
MODE EXT.-DEF.
DEF. 0.0000 g
•
TEMP. CAL.
TEMP. CAL. ON/
OFF
MRS-BA-defsi-0410 142
•
SET
INTERFACE
BAUDRATE 300
BAUDRATE
600
BAUDRATE 1200
BAUDRATE 2400
BAUDRATE 4800
BAUDRATE 9600
BAUDRATE 19200
PARITY
7-EVEN-1STOP
PARITY 7-ODD-1STOP
PARITY 7-NO-2STOP
PARITY 8-NO-1STOP
HANDSHAKE
NO
HANDSHAKE XON-XOFF
HANDSHAKE HARDWARE
•
SET
DATE AND TIME
DATE [DD.MM.YY]
TIME [HH.MM.SS]
FORMAT STANDARD/US
•
PASSWORD
PASSWORD –––– DATA-PROTECTION
OFF
DATA-PROTECTION MED
DATA-PROTECTION HIGH
NEW PASSWORD – – – –
•
THEFTCODE
THEFTCODE –––– THEFT-PROTECTION
OFF
THEFT-PROTECTION ON
NEW CODE – – – –
•
KEY TONE
KEY TONE
ON
/OFF
143
MRS-BA-defsi-0410
• CONTRAST
CONTRAST
6
•
LANGUAGE
LANGUAGE ENGLISH
SPRACHE DEUTSCH
LANGUE FRANCAISE
8.2.1 Application menu tree
«
MENU
» Key is pressed during operation:
• RECALL METHOD
RECALL METHOD
ttt...
ttt...
ttt...
ttt...
ttt...
•
STORE METHOD
STORE METHOD
•
CLEAR METHOD
CLEAR METHOD
ttt...
ttt...
ttt...
ttt...
ttt...
•
METHOD
METHOD
ttt...
• SET TARGET WEIGHT
WEIGHT CHECK ON/
OFF
NOMINAL
5.000 g
UPPER LIMIT
6.000 g
LOWER LIMIT
4.000 g
MRS-BA-defsi-0410 144
•
UNIT
UNIT 100-0%
0-100%
ATRO 100-999%
ATRO 0-999%
G/KG
RESIDUAL WEIGHT
WEIGHT LOSS
BALANCE WEIGHT
•
PRINT RATE
PRINT RATE
1.0
MIN
• STANDBY TEMP.
STANDBY TEMP. ON/
OFF
TEMPERATURE
40
°C
•
AUTOSTART
AUTOSTART ON/OFF
145
MRS-BA-defsi-0410
8.2.2 Key menus
Hold the appropriate key down until the required menu option
appears in the info line. The options „PRINT“ and „TARE“ are not
displayed.
• Print key
PRINT
not displayed
RESET COUNTER
PRINT STATUS
PRINT APPLICATIONS
• Tare key
TARE
not displayed
BALANCE CALIBRATION
TEST CALIBRATION
TEMP. CALIBRATION
TEST TEMPERATURE
• Change key
100-0%
0-100%
ATRO 100-999%
ATRO 0-999%
G/KG
RESIDUAL WEIGHT
WEIGHT LOSS
BALANCE WEIGHT
MRS-BA-defsi-0410 146
8.2.3 Setting drying parameters
• HEATING PROGRAM
•
•
HEAT MODE
STANDARD
BOOST
SOFT
•
DRYING
TEMPERATURE
•
•
TEMPERATURE 105°C
•
DRYING Time
STOP TIME
10.0
MIN
•
TIMER STOP
ON
/OFF
•
STOPMODE
•
AUTOSTOP
OFF
Digit / Time
Percent / Time
ADAPTSTOP
8.2.4 Setting and saving the configuration
«
MENU
» and «
TARE
» keys are pressed during switch-on:
FACTORY CONFIG.
Load the factory configuration
USER CONFIG.
Load the user configuration
STORE CONFIG.
Save the current user configuration
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