Mettler Toledo HG63, HG63-P Operating Instructions Manual
Operating instructions
HG63 and HG63-P Moisture Analyzers
Overview of your HG63 Halogen Moisture Analyzer
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Display, controls and connections of your HG63
No. Designation Info see
Section
1 Display all
2 Keypad all
3 Draft shield 2.3
4 Automatic sample chamber 2.6
5 Sample pan holder 2.3
6 Heating module 7.6
7 Inspection window and vent 6.4
8 Level indicator (level) 2.3
9 Printer cover 7.2
10 Built-in printer (option) 7.5
11 Leveling screw 2.3
12 Display of drying temperature 4.3
13 Display of drying time /
Method number (Selection) 4.4
14 Display of unit (percent or grams) 4.5
15 Weighing-in aid 4.7
16 Function display “Print interval” 4.6
17 Function display “Display mode” 4.5
18 Function display “Drying program” 4.2
19 Function display “Switch-off criterion” 4.4
20 Dialog display (measured values, menu
dialog, text entry, etc.) all
21 Menu symbol 6
22 Method symbol 5
23 Symbol for record comment 4.9
24 Stability detector 8.2/8.3
25 Symbol for calculated result 2.6/4.10
26 Symbol for automatic operating mode of
the automatic sample chamber 6.11
No. Designation Info see
Section
29 Symbol for audio signal device (beeper) 6.12
30 Symbol for test measurement 4.11
31 Status display (User guide) 2.6
32 Key «On/Off» 2.6
33 Function key «Switch-off criterion» 4.4
34 Function key «Drying program» 4.2
35 Function key «Display mode» 4.5
36 Function key «Print interval» 4.6
37 Key «Target weight» (weighing-in aid) 4.7
38 Key «Menu» 6
39 Key «Reset» 2.6
40 Key «Accept entry» all
41 Key «Method» (method selection) 5.2
42 Key «Scroll down» 2.5
43 Key «Scroll up» 2.5
44 Key «Drying time» 4.4
45 Key «Drying temperature» 4.3
46 Key «Code» (record comment) 4.8
47 Key «Stop» (stop drying) 4.9/4.10
48 Key «Delete» 4.1
49 Key «Tare» (zero) 2.6
50 Key «0...9» (alphanumeric entry) 4.8
51 Key «Open/close auto sample chamber» 2.6
52 Key «Start» (start of drying) 2.6
53 Key «Print» 4.10/6.1
54 Key «Paper feed» 2.4/7.2
55 Power supply receptacle 2.3
56 Power line fuses 7.3
27 Symbol for Key protection 6.13
28 Symbol for manual operating mode of the
automatic sample chamber 6.11
57 LocalCAN universal interface ports 9.2
Contents
4
Contents
1 Getting to know your Moisture Analyzer ............................................................................. 6
1.1 Introduction ....................................................................................................................... 6
1.2 What is the Halogen Moisture Analyzer used for?................................................................... 6
1.3 Safety has priority .............................................................................................................. 7
1.4 Important information for these instructions ........................................................................... 9
2 Your first measurement in next to no time ......................................................................... 10
2.1 Unpacking and checking the standard equipment .................................................................. 10
2.2 Selecting the location ......................................................................................................... 11
2.3 Setting up, leveling and connecting to power supply .............................................................. 11
2.4 Preparing the printer ........................................................................................................... 14
2.5 Setting the date and time ....................................................................................................15
2.6 Your first measurement .......................................................................................................17
3 How to obtain the best results ........................................................................................... 21
3.1 Measurement principle of the Halogen Moisture Analyzer ........................................................ 21
3.2 Notes on adjustment of the balance and the heating module................................................... 22
3.3 Optimum sample preparation .............................................................................................. 23
3.4 Further information on moisture determination ....................................................................... 23
4 Practical application of your Moisture Analyzer .................................................................. 24
4.1 Operating principles ........................................................................................................... 24
4.2 Selecting the drying program ............................................................................................... 25
4.3 Setting the drying temperature ............................................................................................. 25
4.4 Selecting the switch-off criterion ...........................................................................................27
4.5 Selecting the display mode ................................................................................................. 29
4.6 Defining the print interval .................................................................................................... 31
4.7 Working with the weighing-in aid ........................................................................................ 32
4.8 Comment lines .................................................................................................................. 34
4.9 Information on the measurement record ............................................................................... 36
4.10 Performing a measurement ................................................................................................. 37
4.11 Test measurement ............................................................................................................. 41
5Methods facilitate your work ............................................................................................. 42
5.1 What is a method? ............................................................................................................42
5.2 Recalling a method ............................................................................................................ 43
5.3 Changing methods ............................................................................................................ 43
5.4 Method menu .................................................................................................................... 45
5.5 Freely selectable switch-off criterion ..................................................................................... 45
5.6 Free factor (-MC) ............................................................................................................... 46
5.7 Free factor (g) ................................................................................................................... 47
5.8 Printing out methods parameters ......................................................................................... 47
Contents
5
6 The menu (basic settings of the instrument) ...................................................................... 49
6.1 Menu operation ................................................................................................................. 49
6.2 Adjusting the balance ......................................................................................................... 50
6.3 Testing the balance ............................................................................................................ 51
6.4 Adjusting the heating module .............................................................................................. 52
6.5 Testing the heating module ................................................................................................. 54
6.6 Resetting to the factory settings............................................................................................56
6.7 Clearing the method memory .............................................................................................. 56
6.8 Setting the time .................................................................................................................. 57
6.9 Entering the date ................................................................................................................ 57
6.10 Setting the vibration adapter ................................................................................................ 57
6.11 Selecting operating mode of the automatic sample chamber ................................................... 58
6.12 Audio signal ...................................................................................................................... 58
6.13 Protecting your settings against change ................................................................................ 59
6.14 Superimposing or removing the function symbols .................................................................. 59
6.15 Switching the printer on or off .............................................................................................. 60
6.16 Switching the method option on or off .................................................................................. 60
6.17 Selecting the dialog language ............................................................................................. 61
6.18 Menu overview HG63 ......................................................................................................... 62
7 Servicing and replacing individual parts ............................................................................ 63
7.1 Cleaning ........................................................................................................................... 63
7.2 Changing the printer paper and ribbon ................................................................................. 64
7.3 Replacing the power line fuses ............................................................................................ 65
7.4 Printer test ........................................................................................................................ 66
7.5 Installing the built-in printer ................................................................................................. 66
7.6 Dismantling and replacing the heating module ...................................................................... 66
8 If problems arise on occasion ........................................................................................... 68
8.1 Notes on the error messages ............................................................................................... 68
8.2 Meaning of the error messages............................................................................................ 69
8.3 What if...? ......................................................................................................................... 71
9 Further useful information ................................................................................................. 74
9.1 Notes on interpretation of the measurement results and the ideal sample weight ....................... 74
9.2 LocalCAN universal interface ............................................................................................... 74
9.3 Application brochure .......................................................................................................... 75
9.4 Switch-off criterion “Weight loss per unit of time” ................................................................... 75
9.5 Comments on certified version............................................................................................. 76
9.6 Technical data ................................................................................................................... 77
9.7 MT-SICS Interface commands and functions.......................................................................... 79
9.8 Optional equipment, expendable material and spare parts ...................................................... 81
10 Index ............................................................................................................................... 82
Getting to know your Moisture Analyzer – Section 1
6
1 Getting to know your Moisture Analyzer
Please read through this Section carefully, it contains important information for safe and economical operation of
your Moisture Analyzer.
1.1 Introduction
Thank you for deciding to purchase a Halogen Moisture Analyzer from METTLER TOLEDO – you have made a wise
choice. Your Moisture Analyzer is fast and reliable. It offers a high level of operating convenience and useful
functions to facilitate determination of the moisture content of your samples.
Behind your instrument stands METTLER TOLEDO, a leading manufacturer of not only balances and scales for the
lab and production, but also analytical measuring instruments. A customer service network covering the entire globe
with well trained personnel is at your service at all times, whether you are choosing accessories or require guidance
for a specific application to ensure optimum utilization of your instrument.
To ensure you make full use of the possibilities offered by your Moisture Analyzer, we advise you to read through
these operating instructions very carefully.
1.2 What is the Halogen Moisture Analyzer used for?
Your Halogen Moisture Analyzer is used for determining the moisture content of almost any substance. The
instrument works on the thermogravimetric principle: At the start of the measurement the Moisture Analyzer
determines the weight of the sample, the sample is then quickly heated by the integral halogen heating module
and the moisture vaporizes. During the drying process the instrument continually measures the weight of the
sample and displays the reduction in moisture. Once drying has been completed, the moisture or solids content
of your sample is displayed as the final result.
Of decisive importance in practice is the rate of heating. In comparison with conventional infrared heating or the
drying oven method, for example, the halogen heating module of your instrument needs a shorter time to reach its
maximum heating power. It also allows use of high temperatures, an additional factor in shortening the drying time.
Uniform heating of the sample material ensures good repeatability of the drying results and makes it possible to use
a smaller amount of sample.
All parameters of a measurement (drying temperature, drying time, etc.) can be preselected. But your Moisture
Analyzer offers many other possibilities. To avoid exceeding the scope of this introduction, only a few of these are
listed here:
– 10 different methods can be individually optimized to suit your samples, and easily activated at a keystroke.
– You can choose between various types of result display at any time.
– Your settings and measurement results can be recorded, stored and protected.
– One comment line can be entered for each measurement.
– Thanks to the built-in rechargeable battery your valuable data remain stored even on power failure.
Section 1 – Getting to know your Moisture Analyzer
This wealth of functions notwithstanding, your Moisture Analyzer is very simple to operate. The status display (User
guide) guides you step by step through the measurement cycle. You always know which particular stage in a
measurement is currently being executed by the instrument and the next operating step. To exclude faulty handling
in routine work, the keypad can be locked to prevent access to all but the elementary functions. The motorized,
automatic sample chamber offers the operating convenience you are familiar with from compact disk (CD) players.
Moreover, the motorized sample chamber opens up new possibilities for automatic operation of the instrument
(loading by means of robots) when used with the LocalCAN universal interface installed as standard.
Besides operating convenience, however, the quality of the measurement results is still what counts above all. The
built-in weighing cell meets the high standard which has made METTLER TOLEDO the worldwide market leader in
the field of high-resolution precision balances.
A brief word regarding standards, directives and procedures for quality assurance. The Moisture Analyzer conforms
with all common standards and directives. It supports stipulations, work techniques and result records as demanded
by all international quality assurance systems, e.g. GLP (Good Laboratory Practice), GMP (Good Manufacturing
Practice). The instrument has a CE declaration of conformity and METTLER TOLEDO as the manufacturer has been
awarded ISO 9001 and ISO 14001 certification. This provides you with the assurance that your capital investment
is protected in the long term by a high product quality and a comprehensive service package (repairs, maintenance,
servicing, calibration service).
You will find further information in the following Sections of these operating instructions. Please read through this
information carefully to ensure you can use your instrument in an optimum and safe manner.
7
1.3 Safety has priority
Your Moisture Analyzer employs state of the art technology and meets the latest demands
regarding instrument safety. This notwithstanding, improper operation can endanger personnel
and cause damage to tangibles. For safe and dependable operation, please comply with the
following instructions:
– The Moisture Analyzer is used for determining the moisture in samples. Please use the
instrument exclusively for this purpose. Any other type of use can endanger personnel and
damage the instrument or other tangibles.
– The Moisture Analyzer must not be operated in a hazardous environment and only under the
ambient conditions specified in these instructions.
– The Moisture Analyzer may be operated only by trained personnel who are familiar with the
properties of the samples used and with the handling of the instrument.
– Your Moisture Analyzer is supplied with a 3-pin power cable with an equipment grounding
conductor. Only extension cables which meet the relevant standards and also have an
equipment grounding conductor may be used. Intentional disconnection of the equipment
grounding conductor is prohibited.
Getting to know your Moisture Analyzer – Section 1
8
The Halogen Moisture Analyzer works with heat!
– Ensure sufficient free space around the instrument to avoid heat accumulation and
overheating (approx. 1 m free space above the instrument).
– The vent over the sample must never be covered, plugged, taped over or tampered with in
any other way.
– Do not place any combustible materials on, under or next to the instrument when it is
connected to the power supply, since the area around the heating module becomes hot.
– Exercise caution when removing the sample. The sample itself, the automatic sample
chamber and any sample vessels used may still be very hot.
– During operation, you should never open the heating module as the ring-shaped heating
module or its protective glass can reach 400 °C! If you have to open the heating module on
occasion, disconnect the instrument from the power supply and wait until the heating module
has cooled down completely.
–No modifications must be made within the heating module. It is particularly dangerous to bend
any components or remove them, or to make any other changes.
Certain samples require special care!
With certain types of samples, there is a possibility of danger to personnel or damage to tangibles
through:
Fire or explosion:
– Flammable or explosive substances
– Substances containing solvents
– Substances which evolve flammable or explosive gases or vapors when heated.
With such samples, work at a drying temperature that is low enough to prevent the formation
of flames or an explosion and wear protective goggles. Should there be any uncertainty
regarding the flammability of a sample, always work with a small amounts of sample (max.
1 gram). In such cases, never leave the instrument unattended! In cases of doubt, perform
a careful risk analysis.
Poisoning, burning:
– Substances which contain toxic or caustic components. Such substances may be dried only
in a fume cupboard.
Corrosion:
– Substances which evolve corrosive vapors when heated (e.g. acids). In the case of such
substances, we advise you to work with small amounts of sample as the vapor can condense
on cooler housing parts and cause corrosion (if necessary, the heating module can be
changed very easily by the user, see Section 7.6).
Please note that the user always takes responsibility and assumes liability for damage
caused by use of the types of samples mentioned above!
– Never make any modifications or constructional alterations to the instrument and use only
original spare parts and optional equipment from METTLER TOLEDO.
– Your Moisture Analyzer is a rugged precision instrument – but you should still treat it carefully;
it will then thank you with many years of trouble-free operation.
Section 1 – Getting to know your Moisture Analyzer
– Please comply with all notes and instructions in these operating instructions. Keep the
instructions in a safe place where they are immediately to hand if any points are unclear.
If you lose these instructions, please contact your METTLER TOLEDO dealer for an
immediate replacement.
Moisture determination applications must be optimized and validated by the user
according to local regulations. Application-specific data provided by METTLER TOLEDO is
intended for guidance only.
1.4 Important information for these instructions
These instructions guide you step by step through the operation of your Moisture Analyzer. The first two Sections
help you put the instrument into operation quickly, safely and properly and perform your first measurement within
a short space of time. In Sections 3 through 6 you become intimately acquainted with the wide range of functions
of your Moisture Analyzer. During this learning phase, you will find the table of contents and the detailed index in
Section 10 a valuable orientation aid. Sections 7 through 9 contain additional information on the maintenance of
your instrument, troubleshooting and the available options. As soon as you are familiar with your Moisture Analyzer,
you will find the illustrations at the beginning of these instructions and the associated references (in the key) useful
for quick access.
The following identifications and symbols are used in these instructions:
– Key designations are shown enclosed by twin angle brackets «». Keys with inscribed text are
shown with the actual inscription (e.g. «On/Off» or «Start»). For all keys with symbols,
designations are used in the text which describe the function of the particular key («Print»,
«Accept entry» or «Scroll down»).
– This symbol indicates safety and hazard instructions. If these are not complied with, injury
to the user, damage to your instrument or other tangibles and malfunctions can result.
9
– This symbol indicates additional information and directions which facilitate your handling of
the instrument and contribute to proper and economical use.
These instructions are also available in foreign languages. Should you require a set of
instructions in a different language, please contact your METTLER TOLEDO dealer. You will find
the address of your nearest dealer in the attached “Declaration of Conformity 11780294”.
Your first measurement in next to no time – Section 2
10
2Your first measurement in next to no time
In the Section you will learn how to put your new Moisture Analyzer into operation and obtain measurement results
within a very short space of time.
2.1 Unpacking and checking the standard equipment
Open the package and remove the instrument and the accessories. Check the completeness of the delivery. The
following accessories are part of the standard equipment of your new Moisture Analyzer:
– 80 aluminum sample pans
–1 sample holder
–1 sample handler
–1 specimen sample (circular, absorbent glass fiber filter)
–1 draft shield element
–1 power cable
–1 set of operating instructions, 1 set of short-form operating instructions
–1 Application brochure “Methods of moisture content determination”
–1 CE declaration of conformity (in separate brochure 11780294)
– Setup instructions
Remove the wrapping from the instrument.
Check the instrument for transport damage. Immediately inform your METTLER TOLEDO dealer if you have any
complaints or parts are missing.
Store all parts of the packaging. This packaging guarantees the best possible protection for the
transport of your instrument.
To prevent transport damage, the instrument is provided with a transport arrestment, which you
have to remove before putting the instrument into operation for the first time. The procedure for
removing the transport arrestment is explained in the description “Setup instructions 11780556”
enclosed with the package.
Section 2 – Your first measurement in next to no time
11
2.2 Selecting the location
Your Moisture Analyzer is a precision instrument. An optimum location guarantees accuracy and dependability:
– Firm, horizontal location as free from vibrations as possible
– Avoid direct sunlight
– No excessive temperature fluctuations
– No powerful drafts
– Surroundings as free from dust as possible
– Adequate free space at the front for opening the sample chamber and
sufficient clearance around the instrument to allow warm air to dissipate.
– Sufficient distance from heat-sensitive materials in the vicinity of the
instrument.
2.3 Setting up, leveling and connecting to power supply
Exact horizontal positioning and stable installation are prerequisites for repeatable results. To compensate small
irregularities or inclinations (±2%) at the location, the instrument can be leveled.
For exact horizontal positioning, the Moisture Analyzer has a level indicator
R
L
R
(level) and 3 leveling screws. As soon as the air bubble is precisely in the
L
middle of the cross hairs, the instrument is exactly horizontal. To level it,
proceed as follows:
Position your Moisture Analyzer at the selected location.
Screw in the right front leveling screw completely (it is not needed for
leveling). The instrument is now standing on the front left, nonadjustable
foot, as well as on the two rear leveling screws.
Turn the two rear leveling screws until the air bubble is located in the middle
of the level indicator. The arrows and the leveling screw designations (R =
right rear leveling screw, L = left rear leveling screw) on the cross hairs will
facilitate the setting:
Your first measurement in next to no time – Section 2
12
R
L
indicates the right leveling screw must be turned in a clockwise direction.
Unscrew the front right leveling screw until it contacts the support and the
If the air bubble is located at the bottom left, for instance, the inscription
R
L
instrument is resting firmly on all 4 feet. Ensure that the air bubble remains
in the center of the level indicator.
R
L
R
Note: The instrument should be releveled each time its location is changed.
L
Connect the instrument to the power supply.
Warning:
If the power cable supplied is not long enough, use only a 3-pin extension
cable with equipment grounding conductor!
For technical reasons, the halogen heating module is designed specifically
for a particular line voltage (110 V AC or 230 V AC). A heating module is
installed in the factory that is matched to the particular line voltage of the
country of destination. If you are not sure whether the heating module built
into your instrument is suitable for your local line voltage, check the voltage
data in the interior of the heating module before you connect the Moisture
Analyzer to the power supply!
Connection to a line voltage that is too high can lead to blowing of the fuses,
whereas a supply voltage that is too low will prolong the drying process.
On/Off
Ensure that the transport arrestment is removed. Instructions on how to
remove the transport arrestment can be found on the leaflet enclosed with the
package.
Switch the instrument on with the «On/Off» key.
Note: When putting into operation for the first time, leave the instrument
connected to the power supply for at least 5 hours to allow the built-in battery
to charge up! If the instrument is later disconnected from the power supply
for several months, the battery will become discharged. This leads to data
loss. To recharge the battery, leave the instrument connected to the power
supply for at least 5 hours.
2
Section 2 – Your first measurement in next to no time
13
Press the «Open/close auto sample chamber» key and ...
… the motorized, automatic sample chamber opens.
Always ensure sufficient free space in front of the instrument since the
emerging automatic sample chamber could knock over objects in its path
or push them off the bench.
Install the draft shield element (only one position possible) and then the
sample pan holder. Turn the sample pan holder until it engages. In the locked
position, the rear arm of the sample pan holder points exactly in the direction
of motion of the automatic sample chamber.
2
Press the «Open/close auto sample chamber» key and ...
… the motorized, automatic sample chamber closes.
Your first measurement in next to no time – Section 2
14
2.4 Preparing the printer
If your Moisture Analyzer is not equipped with a built-in printer, there is no need to read this section. You can always
order the built-in printer at a later date and install it yourself.
You can prepare the built-in printer for use as follows:
Disconnect the instrument from the power supply.
Swing back the cover of the printer.
HR73
Halogen Moisture Analyzer
Insert the ribbon cassette in the printer and press it down until you hear it click
into place.
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Tension the ribbon by turning the small wheel on the left of the cassette in
the direction shown by the arrow.
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On/Off
Section 2 – Your first measurement in next to no time
15
Place the roll of paper in the paper compartment and feed the paper
horizontally through the slot at the back of the printing unit.
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Connect the instrument to the power supply and switch it on with the «On/
Off» key. Press the «Paper feed» key until the leading edge of the paper exits
the printing unit at the top.
Lead the paper through the slot in the cover of the built-in printer and close
the cover.
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2.5 Setting the date and time
Your Moisture Analyzer prints out the date and time on every record. When you put your new instrument into operation
for the first time, you should enter the current date and the time. These settings are retained even if you disconnect
your instrument from the power supply.
In this Section you will enter the menu for the first time, although this is described in detail in a later section. Do not
worry if you have to press keys whose function you are not familiar with, simply follow the instructions step by step.
We describe the menu in detail in Section 6.
Note: Various languages are available for the dialog with your instrument and can be selected in the menu. You
will find further details on language selection in Section 6.17.
Press the «On/Off» key to switch the instrument on.
On/Off
After it has been switched on, the instrument performs a self-test. Wait until
the display shown opposite appears.
Your first measurement in next to no time – Section 2
16
Menu
Menu
∑CAˆ NO
Menu
TIMË 1‹04
Menu
TIMË 1Æ28
Press the «Menu» key. You are now already in the menu.
Press the «Accept entry» or «Menu» key repeatedly until the display shown
1
opposite for entry of the time appears.
Important: Do not press any other key, otherwise you could possibly change
the factory settings of your instrument!
Use the «Scroll up» and «Scroll down» keys to set the time (00:00–23:59).
By pressing and holding the keys you can accelerate the change in the time.
1
Confirm your setting with the «Accept entry» key. The instrument stores the
time.
Reset
Menu
DAÎ 2{0“03
Menu
DAÎ 0[0#0#
After confirmation of the time, the display for entry of the current date appears.
2
Use the «Scroll up» and «Scroll down» keys to set the date in the format “Day
– Month – Year” (DD.MM.YY). By pressing and holding the keys you can
accelerate the change in the date. Confirm your entry with the «Accept entry»
2
key and the instrument stores the date.
Note: With US English as the dialog language, the following applies to entry
of the date format “Month – Day – Year” (MM/DD/YY).
This completes your entry of the date and time, and you can now quit the
menu by pressing the «Reset» key. Your settings are stored and remain so
even in the event of a power failure. The Moisture Analyzer is now ready for
your first measurement.
Section 2 – Your first measurement in next to no time
17
2.6 Your first measurement
After you have successfully put your new Moisture Analyzer into operation for the first time, you can immediately
perform your first measurement. In doing so, you will become familiar with the instrument and the status display
and at the same time perform a function check.
Please use the specimen sample supplied for your first measurement. This sample is an absorbent glass fiber filter.
During your first measurement, the instrument operates with the factory settings.
Your Moisture Analyzer has a novel graphical status display (User guide)
which you will become acquainted with in this section. The status display
informs you continuously about the current status of the instrument and
prompts you to execute the next operating step (shown flashing).
Switch the instrument on with the «On/Off» key.
On/Off
2
Initial status with closed automatic sample chamber.
Press the «Open/close auto sample chamber» key and …
… the motorized, automatic sample chamber opens.
Always ensure sufficient free space in front of the instrument since the
emerging automatic sample chamber could knock over objects in its path
or push them off the bench.
Status: Ready for taring
The status display flashes and prompts you to load the empty sample pan
and tare.
Your first measurement in next to no time – Section 2
18
Place the empty sample pan in the sample pan handler (this is possible
without tilting the sample pan if you insert this in the pan handler from the
side directly below the round flange). Place the sample pan handler in the
automatic sample chamber. Ensure that the tongue of the pan handler fits
exactly in the slot of the draft shield element. The sample pan must lie flat
in the pan holder.
Note: We advise you to work with the sample pan handler at all times. The
pan handler is ergonomic, safe and provides protection against possible
burns due to the hot sample pan.
Press the «Tare (zero)» key. This sets the balance installed in the Moisture
#
Analyzer to zero. For taring, the automatic sample chamber closes briefly
then opens again.
Status: Ready for weighing
After taring, the status display flashes and prompts you to place the sample
in the sample pan.
Place the specimen sample in the sample pan.
Wet the specimen sample with a few drops of water.
Status: Ready for start
The status display flashes and prompts you to start the drying process.
Start
-|84
104
≠30
Section 2 – Your first measurement in next to no time
19
Press the «Start» key and …
… the motorized, automatic sample chamber closes. The instrument starts
the drying and measurement.
Status: Drying and measurement
You can follow the drying and measurement process in the display:
– The status display uses rising bubbles to symbolize the drying process.
– The current temperature in the heating module is displayed as well as the
elapsed drying time and the current drying value.
– Further, the display shows information on the selected settings. You will
find additional information on the meaning of the displays and the various
setting possibilities in Section 4. If your instrument has a built-in printer,
the measurement results will be printed out continually (at intervals of
30 seconds).
ENfl -1Ç52
At the end of the drying time, an audio signal sounds and the sample
chamber is automatically opened.
Warning: Sample pan and sample are still hot!
You can now read off the moisture content of your sample in the display.
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Your first measurement in next to no time – Section 2
20
Carefully remove the sample pan handler from the automatic sample
chamber.
Warning: As the pan and sample may still be hot, you should let these cool
down before removing the pan from the handler!
Reset
To remove the sample pan from the handler, lift the pan slightly from below
and pull it sideways out of the handler (if you no longer need the sample and
the pan, you can simply tilt the handler until the pan slides out).
Press the «Reset» key to delete the measurement result from the display. The
instrument is now ready for the next measurement. If you do not wish to
perform another measurement, press the «Open/close auto sample chamber» key. The automatic sample chamber closes.
Congratulations!
You have just performed your first measurement with your new Moisture
Analyzer. In the following section you will find important information on the
operating principle of your instrument, its calibration and optimum preparation of your samples.
Notes on the automatic sample chamber
– Before every automatic closure of the automatic sample chamber, an
audio signal sounds.
– For reasons of safety, the open automatc sample chamber is automati-
cally closed after 2 minutes. If a weight change occurs or a key is pressed
during this time, the 2 minute period starts over again.
Section 3 – How to obtain the best results
21
3 How to obtain the best results
Following your first practical work with the Moisture Analyzer, in this Section you will find important information on
how to obtain optimum results. You will discover what parameters influence the measurement process and how
you can match the instrument optimally to your particular measurement task.
3.1 Measurement principle of the Halogen Moisture Analyzer
Your instrument performs measurements based on the thermogravimetric principle, i.e. the moisture is determined
from the weight loss of a sample dried by heating.
In principle, your instrument thus comprises two instruments: a precision
120
balance and a heating module. In contrast to other thermogravimetric
methods (drying oven, infrared, microwave), the Halogen Moisture Analyzer
operates with a halogen heating module. This ensures fast heating of the
sample and thus guarantees rapid availability of the measurement results.
Irrespective of the measurement method, the quality of the measurement results stands or falls by the preparation
of the sample and a correct choice of the important measurement parameters:
– Sample size
– Drying temperature
–Switchoff mode
– Drying time
Inappropriate setting of these parameters can cause the results to be incorrect or
misleading. For this reason, check that the results for each type of sample are what might
reasonably be expected.
You will find detailed information on the relationships between these parameters in the application brochure for
moisture determination (see Section 9.3), enclosed to your instrument.
In practice, however, not only the quality of the measurement results, but also the speed of the measurement
process is important. Thanks to its drying principle (with the heat generated by a halogen radiator), the Halogen
Moisture Analyzer is very fast. You can increase the speed even further through optimum setting of the instrument.
The optimum drying temperature and the drying time are dependent on the nature and size of the sample and
on the desired accuracy of the measurement results. These can be determined only by experiment. The Halogen
Moisture Analyzer supports you in this task: It offers automatic performance and result recording of test
measurements.
How to obtain the best results – Section 3
22
3.2 Notes on adjustment of the balance and the heating module
You should adjust your Moisture Analyzer regularly (e.g. every six months) if this is stipulated by your quality
assurance system (e.g. GLP, GMP, ISO 9001).
The balance and the integral heating module in your instrument can be adjusted using the appropriate accessories
(see Section 9.8). The heating module and balance can also be tested (to check the adjustment). The operator
can define a test weight or the test temperature, together with permissible tolerances for this test. A test report is
printed out showing the test result as “Passed” or “Failed” (see Section 6.3 and 6.5).
By adjusting the heating module you can ensure comparability with results from other instruments of the same
design. This is done by using an appropriate thermometer, which is provided in the form of a temperature
adjustment set with calibration certificate (see Section 9.8). This adjustment set comprises a black plate with a
thermometer, which allows a reproducible adjustment of the heating module.
A Moisture Analyzer is typically used in place of or in addition to the oven method. In an oven heat energy is
transferred by the flow of air, which establishes an equilibrium between the sample temperature and the ambient
temperature. This is not the case in a Moisture Analyzer. The actual sample temperature primarily depends on the
specific absorption properties of the sample (“dark” samples absorb more heat), which can change during the
measurement process.
temperature inside the sample. The heat output is therefore not dependent on the true sample temperature but
instead is regulated by a temperature sensor underneath the halogen heating module.
For the reasons explained above, the temperature setting on the instrument will therefore by deviate to the true
sample temperature. By regularly adjusting the heating module, you will ensure a consistent and reproducible heat
output for the entire lifetime of your instrument.
Note: METTLER TOLEDO offers an adjustment service – please contact your local dealer.
– If you also use your instrument as a high precision lab balance, you should adjust the balance at regular intervals.
– If you replace the heating module, you must adjust it using the temperature adjustment set, which is available
as an accessory.
The procedure for adjusting the balance and heating module is described in Section 6.
There can also be differences between the temperature at the surface of the sample and the
Section 3 – How to obtain the best results
23
3.3 Optimum sample preparation
Preparation of the sample is decisive for the speed of the measurement process and the quality of the measurement
results.
Please note the following basic rules for the preparation of your sample:
The amount of sample you select should be as small as possible and only as large as necessary
Excessive amounts of sample require more time for drying and thus prolong the measurement process. If the amount
of sample is too small, the measurement result may possibly not be representative. The following always holds:
The greater the inhomogeneity of the sample, the larger the amount of sample needed to obtain a repeatable result
(please see also the list in Section 9.1).
Distribute the sample evenly over the sample pan
You thus increase the surface area of the sample and facilitate heat absorption. The base of the pan should be evenly
covered.
With liquid, fat-containing, melting and highly reflecting samples, you should cover the sample with the glass fiber
filter available as optional equipment (HA-F1 214464, see Section 9.8). This also applies to samples which form
a skin on their surface when heated. The glass fiber filter ensures even and rapid heat distribution and prevents the
formation of a skin impervious to moisture on the sample surface.
3.4 Further information on moisture determination
You will find further information on the moisture determination, the importance of the parameters and the preparation
of the samples in the Application Brochure “Methods of moisture content determination” dealing with moisture
determination (see Section 9.3).
Useful tips and a variety of example methods (comparison between Halogen Moisture Analyzer results and the oven
method) can be downloaded from www.mt.com/moisture.
If you require information on specific applications, your METTLER TOLEDO dealer will be pleased to help you.
Moisture determination applications must be optimized and validated by the user according
to local regulations. Application-specific data provided by METTLER TOLEDO is intended for
guidance only.
Practical application of your Moisture Analyzer – Section 4
24
4 Practical application of your Moisture Analyzer
In this Section we introduce you to the wide range of setting possibilities of your Moisture Analyzer and offer
information and tips for optimum setting of the parameters.
4.1 Operating principles
You already performed your first measurement in Section 2. This measurement was carried out using the factory
settings. However, your instrument offers a number of setting possibilities to match the measurement process to your
specific requirements. For instance, you can preselect the drying temperature, the type of result display and many
other parameters.
Settings are made using the function keys. These keys are right at the top of
the keypad, directly below the display. The setting you select appears in the
display directly above the associated key.
%
95
125
You will learn the available setting possibilities and the function keys in detail
in the following Sections. Further, you will also discover how to set the drying
temperature and the drying time and how to work with the weighing-in aid.
Finally, you will perform a complete measurement with the specific settings
for your sample.
Numeric entries:
With some settings (e.g. the drying temperature), numeric entries are
required. There are two different ways of entering numerical values:
You can change the flashing displayed value with the «Scroll up» or «Scroll
down» key or ...
... You can enter the new value with the «0…9» key.
0...9
As soon as you have entered the desired value, press the «Accept entry» key.
The value will be stored.
Section 4 – Practical application of your Moisture Analyzer
25
Preliminary information on the methods:
All settings for a sample which you will learn in the following Sections can be collected in a so-called “Method”.
You have 10 methods freely available thus giving you the possibility of defining a method for a particular sample
and recalling it at any time. This eases the work load considerably as each time you switch to a different type of
sample there is no need to repeat all the parameter settings. The methods are retained when the instrument is
switched off. You will find information on the compilation and use of methods in Section 5.
4.2 Selecting the drying program
This function key offers you two different drying programs for optimum matching of the drying characteristics to the
sample used.
Each time this key is pressed, the next program appears. After the fourth and
last program, the first reappears in the display. As soon as you have selected
the desired program, the setting is active and you do not have to confirm or
store it.
Standard drying
This drying program is set in the factory and is suitable for most samples.
The sample is heated to the drying temperature (set temperature) and held
constant at this temperature.
Rapid drying
This program is primarily suitable for samples with a moisture content over
30%. Following the start, the selected temperature is exceeded by 40% for
3 minutes to compensate the cooling due to vaporization and accelerate the
drying process. The drying temperature is then lowered to the set value and
maintained. You will find details on how to enter the drying temperature in
the Section 4.3.
4.3 Setting the drying temperature
After pressing this key you can enter the drying temperature (set temperature).
The type of entry depends on the selected drying program (see Section 4.2).
If you have selected one of the programs “Standard drying” or “Rapid drying”,
you need enter only the drying temperature.
Practical application of your Moisture Analyzer – Section 4
26
Selecting drying temperature for standard drying and rapid drying
Final temperature
Start of drying
125
Temperature limitation
°C
200
160
10 50
Start
t (min.)
You need enter only the desired final temperature.
Press the «Drying temperature» key and enter the desired drying temperature
(see Section 4.1).
– either with the «Scroll up» and «Scroll down» keys or
–with the «0…9» key.
Press the «Accept entry» key.
Note: The admissible input range for temperatures is 40°C–200 °C.
Several mutually independent systems prevent the instrument overheating:
– At temperatures above 160 °C a time limit becomes active. The higher the
temperature, the shorter the time until the instrument starts to lower the
temperature (envelope curve, see illustration opposite).
–A temperature switch independent of the normal black temperature sensor
over the sample (see Section 7.1) is triggered when it detects exceptionally high temperatures. This situation could arise, for example, if the
sample begins to burn or the temperature calibration is defective. If this
happens, the heating module is tripped out by a mechanical switch, and
the instrument cannot be restarted. Please refer to Section 8.3 for
troubleshooting.
When working with temperatures over 180 °C we recommend that you
always wait 2 - 3 minutes between individual measurements, in order to
ensure good reproducibility of the readings.
Note: A measurement cannot be started until the drying temperature is
higher than the temperature in the measuring room.
You can check the
current temperature by pressing the «Tare (zero)» key. This avoids a false
start (Error 10, Section 8.2).
Section 4 – Practical application of your Moisture Analyzer
27
4.4 Selecting the switch-off criterion
This function key offers you different switch-off criteria. A switch-off criterion defines when the instrument should end
the drying. Switch-off criteria save you having to keep checking your watch and stopping the drying manually.
The following settings can be selected for the switch-off criterion:
–“Weight loss per unit of time” (5 settings)
– “Free switch-off criterion” (if activated in the Methods menu,
Section 5.4)
–“Manual switch-off”
– “Timed switch-off”
– “Test measurement” for determination of the suitable switch-off criterion
Weight loss per unit of time
This switch-off criterion is based on a weight loss per unit of time. As soon as the mean weight loss is less that a
preset value during a specified time, the instrument considers drying as complete and automatically discontinues
the measurement process. During the drying, the time display shows you how long the measurement process has
been in progress. The switch-off criterion is inactive during the first 30 sec. You will find additional information in
Section 9.4.
The following 5 settings are available:
This setting is suitable for samples which dry very quickly (surface moisture)
or for (relatively inaccurate) fast measurements to determine a trend.
This setting is suitable for quick drying samples.
This is the factory setting. It is suitable for most types of samples.
This setting is suitable for samples which dry moderately quickly.
This setting is suitable for samples which dry very slowly (trapped moisture,
skin formation).
Note: If you do not know the behavior of a sample, perform a test measurement to determine the suitable switch-off criterion. The procedure is
described later in this section under the title “Test measurement”.
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