KERN & SOHN MLB 50-3C User Manual
KERN & Sohn GmbH
Ziegelei 1
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Internet: www.kern-sohn.com
Operating manual
Electronic Moisture Analyser
KERN MLB_C
Version 3.1
03/2014
GB
D-72336 Balingen
Fax: +49-[0]7433-9933-149
MLB_C-BA-e-1431
KERN MLB_C
Electronic Moisture Analyser
GB
Version 3.1 03/2014
Operating manual
Contents
1 TECHNICAL DATA ............................................................................................. 5
1.1 Dimensions ............................................................................................................................... 6
2 DEVICE OVERVIEW ........................................................................................... 7
2.1 Keyboard overview ................................................................................................................... 8
2.2 Display overview (during measurement) ............................................................................... 9
3 BASIC INFORMATION (GENERAL) ................................................................ 10
3.1 Proper use ............................................................................................................................... 10
3.2 Improper Use .......................................................................................................................... 10
3.3 Warranty .................................................................................................................................. 10
3.4 Monitoring of Test Resources ............................................................................................... 10
4 BASIC SAFETY PRECAUTIONS ..................................................................... 11
4.1 Pay attention to the instructions in the Operation Manual ................................................ 11
4.2 Personnel training .................................................................................................................. 11
4.3 Danger Information ................................................................................................................ 11
5 TRANSPOR T AN D STOR AGE ......................................................................... 13
5.1 Testing upon acceptance ...................................................................................................... 13
5.2 Packaging / return transport ................................................................................................. 13
6 UNPACKING, SETUP AND COMMISSIONING ............................................... 15
6.1 Installation Site, Location of Use .......................................................................................... 15
6.2 Unpacking and assembly ...................................................................................................... 16
6.2.1 Scope of delivery ............................................................................................................. 17
6.3 Mains connection ................................................................................................................... 17
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6.4 Switch on/switch off device .................................................................................................. 17
Stability display ................................................................................................................................... 17
Balance zero display ........................................................................................................................... 17
6.5 Connection of peripheral devices ......................................................................................... 18
6.6 Initial Commissioning ............................................................................................................ 18
7 WEIGH/TARE ................................................................................................... 19
8 MENU ................................................................................................................ 20
9 P1 CAL - ADJUSTMENT .................................................................................. 22
9.1 P1-01 External adjustment .................................................................................................... 22
9.2 P1-02 Adjustment test ............................................................................................................ 23
9.3 P1-03 Temperature adjustment ............................................................................................. 24
9.5 P1-04 Adjustment record print-out ....................................................................................... 28
9.6 P1-05 temperature calibration ............................................................................................... 29
10 P2 GLP (GOOD LABORATORY PRACTICE) .............................................. 31
11 P3 SETTING DATE/TIME .............................................................................. 33
12 P4 BASIC SETTINGS ................................................................................... 34
13 P5 RS 232 INTERFACE ................................................................................ 36
14 P6 OTHER USEFUL FUNCTIONS ................................................................ 39
15 OPERATOR MENU – MOISTURE ANALYSIS ............................................. 42
15.1 Moisture analysis without using the progra m library ......................................................... 42
Setting drying parameters .................................................................................................................. 42
How to implement drying .................................................................................................................... 51
15.2 Moisture analysis using the program library ...................................................................... 55
Activate program library “P6-01-Libr” ............................................................................................... 55
Setting drying parameters .................................................................................................................. 55
Select drying parameters and carry o u t d ry ing ............................................................................... 56
MLB_C-BA-e-1431 3
16 GENERAL INFORMATION CONCERNING MOISTURE ANALYSIS ........... 57
16.1 Application .............................................................................................................................. 57
16.2 Basics ...................................................................................................................................... 57
16.3 Adjustment to existing measuring method ......................................................................... 57
16.4 Preparing a sample ................................................................................................................ 58
16.5 Sample material ...................................................................................................................... 59
16.6 Sample size / originally weighted in quantity ...................................................................... 59
16.7 Drying temperature ................................................................................................................ 60
16.8 Recommendations / Guidelines ............................................................................................ 61
17 DATA OUT PUT ............................................................................................. 62
17.1 Remote control instructions ................................................................................................. 63
18 SERVICING, MAINTENANCE, DISPOSAL .................................................. 64
18.1 Cleaning .................................................................................................................................. 64
18.2 Ch ange fuse ............................................................................................................................ 66
18.3 Ser vicing, maintenance ......................................................................................................... 66
18.4 Disposal ................................................................................................................................... 66
19 INSTANT HELP ............................................................................................. 67
20 DECLARATION OF CONFORMITY .............................................................. 68
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1 Technical data
Repeatability for
quantity 2 g
Repeatability for
quantity 10 g
Repeatability in weighing
deviation)
Environmental
conditions
• +10°C….+40°C ambient temperature
• max 80% air humidity non-condensing
Data MLB 50-3C MLB 50-3C110V
Radiator Infrared (1 x 400 W)
Temperature range max. 160°C
Maximum load (Max) 50 g
Readability (d) 1 mg
Display accuracy
Weighed portion < 1.5 g
Display accuracy
Weighed portion > 1.5 g
Recommended
adjustment weight, not
added (class)
Sample size max. 50 g
Warm-up time 4 h
Standard drying
Heating profiles
Step-by-step drying
Quick drying
Gentle drying
0,01 %
0,001 %
50g (F1)
originally weighted in
originally weighted in
mode (= standard
MLB_C-BA-e-1431 5
0.24 %
0,04 %
0,001g
• Automatic 1 (shut-down at change of weighing value
• Time-controlled (1 min – 9h 59 min)
Residual weight
[g]
Shut-down criteria
< 1mg within 10 s)
• Automatic 2 (shut-down at change of weighing value
< 1mg within 25 s)
• Automatic 3 (shut-down at change of weighing value
< 1mg within 60 s)
• Automatic 4 (shut-down at change of weighing value
< 1mg within 90 s)
• Automatic 5 (shut-down at change of weighing value
< 1mg within 120 s)
• Manual
Sample dishes included 10 (Ø 92 mm)
Display after drying
Display can be switched at
any time
Moisture [%] =
Weight loss from starting weight (SW)
Dry mass [%] =
Residual weight (RW) left from starting weight
(SW)
ATRO[%] [(SG – RG) : RG ] x 100% 0 – 999 %
0 – 100 %
100 – 0 %
Dimensions Housing 206 x 333 x 192 mm
Available drying chamber 120 x 120 x 20 mm
Net weight 4.9 kg
Electric Supply 230V/420W 50 Hz AC 110V/420W 60 Hz AC
1.1 Dimensions
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2 Device o verview
Pos.
Description
1
Heated cover
2
Viewing panel
3
Halogen lamp
4
Sample dish
5
Windshield
6
Removal aid
7
Display
8
Keyboard
9
Adjustable foot
MLB_C-BA-e-1431 7
2.1 Keyboard overview
Button Function
• Switch machine on/off
• Switch display during drying process
• Start/finish measurement
• Exit menu
• Quit
• Navigation keys
• Data export to external device
• Confirm / store settings
• Taring
• Zeroing
• Go to application menu
(set drying parameters)
• Call-up user menu
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2.2 Display overview (during measurement)
1. Display in moisture %
2. Current moisture content in %.
3. Results display in moisture %
4. Heating profile
5. Shutoff criterion
6. Previous drying time
7. Current temperature
8. Drying process active
MLB_C-BA-e-1431 9
3 Basic Information (General)
3.1 Proper use
The device purchased by you is designed for a fast and reliable determination of
material moisture in liquid, porous and solid materials by applying the method of
thermogravimetrics.
3.2 Improper Use
Impacts and overloading exceeding the stated maximum load (max) of the device,
minus a possibly existing tare load, must be strictly avoided.
Balance may be damage by this.
Never operate device in explosive environment. The serial version is not explosion
protected.
The structure of the balance may not be modified. This may lead to incorrect
weighing results, safety-related faul ts and des tr ucti on o f the balance.
The balance may only be used according to the described conditions. Other areas of
use must be released by KERN in writing.
3.3 Warranty
Loss of warranty due to:
- Our conditions in the operation manual are ignored
- The appliance is used outside the described uses
- The appliance is modified or opened
- Mechanical damage and damag e caused by media, liquids, natural wear and tear
- The appliance is improperly set up or incorrectly electrically connected
- The measuring system is overloaded
3.4 Monitoring of Test Resources
In the framework of quality assurance the measuring-related properties of the
balance and, if applicable, the testing weight, must be checked regularly. The
responsible user must define a suitable interval as well as type and scope of this test.
Information is available on KERN’s home page (www.kern-sohn.com) with regard to
the monitoring of balance test substances and the test weights required for this. In
KERN's accredited DKD calibration laboratory test weights and balances may be
calibrated (return to the national standard) fast and at moderate cost.
10 MLB_C-BA-e-1431
4 Basic Safety Precautions
Carefully read this operation manual before setup and commissioning,
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The sample itself, the sample dish and the
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4.1 Pay attention to the instructions in the Operation Manual
even if you are already familiar with KERN balances.
All language versions contain a non-binding translation.
The original German is binding.
4.2 Personnel training
The device may be used and serviced only by trained staff.
4.3 Danger Information
WARNING
The moisture analyser is used to analyse the moisture content of materials.
This instrument must be used exclusively for this purpose. Any other usage
may cause a risk to personnel, damage to the instrument or other material
damage.
The moisture analyser should be used mainly for the drying of aqueous
substances.
The moisture analyser may not be used in a hazardous area.
The instrument may only be operated and maintained by trained personnel.
Carefully read this operation manual before setup and commissioning, even if
you are already familiar with KERN instruments.
Hazards during and after measuring
Ensure correct installation of all components, see chap. 6.2
Careful when removing the sample.
heating unit may be very hot.
Use the sample retainer at all times as it allows safe working and prevents
burns.
Individual parts of the case (e. g. the ventilation grids) may heat up
considerably during operation. Therefore, only take hold of the instrument by
the marked handles.
MLB_C-BA-e-1431 11
CAUTION
The moisture analyzer operates using heat!
CAUTION
Fire or explosion
WARNING
airways), induce nausea or result in death
+ Maintain sufficient space in the environment of the instrument to
prevent heat build-up (distance from the instrument 20cm,
upwards 1m).
+ The heat extractor of the sample must never be covered, blocked,
taped up or altered in any other way.
+ Never place combustible materials on, under or next to the
instrument, as the environment of the instrument heats up to a
high temperature.
+ Careful when removing the sample. The sample itself, the sample
dish and the heating unit may be very hot.
+ Explosive, easily flammable samples and samples that go into a
chemical reaction when subjected to heat, may not be analysed
with the moisture analyser. Sample materi al s developing
aggressive vapours (e. g. acids) may cause corrosion problems on
some parts of the instrument.
+ If in doubt, conduct a risk analysis.
+ Select a drying temperature for samples of this kind that is low
enough to prevent ignition or explosion.
+ Wear safety go ggles.
Substances that contain toxic or corrosive ingredients,
produce toxic gases when drying, cause irritation (eyes, skin,
+ Sample materials emitting toxic substances must be dried with a
special extraction system in place. Create an environment that
prevents the inhalation of vapours hazardous to health.
+ Sample materials developing aggressive vapours (e. g. acids) may
12 MLB_C-BA-e-1431
cause corrosion problems on some parts of the instrument.
5 T ransport and storage
Prior to dispatch disconnect all cables and remove loose/mobile
5.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
5.2 Packaging / return transport
Keep all parts of the original packaging for a possibly required
return.
Only use original packaging for returning.
parts.
MLB_C-BA-e-1431 13
Secure all items against slipping or damage.
14 MLB_C-BA-e-1431
6 Unpacking, Setup and Commi s si oning
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should electromagnetic fields (e.g. due to mobile phones or radio instruments),
!
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6.1 Installation Site, Location of Use
The instrument is designed to achieve reliable weighing results under normal
conditions of use. You will work accurately and fast, if you select the right location for
the instrument.
On the installation site observe the following:
Remove explosion prone and easily flammable material in the immediate
vicinity.
Emerging vapours, sample dish and all parts of the sample chamber are hot!
Protect the instrument against direct draughts due to open windows and
doors.
Avoid extreme heat and temperature fluctuations e.g. due to installation next
to radiators.
Do not expose the instrument to extreme dampness for longer periods of time.
Non-permitted condensation (condensation of air humidity on the instrument )
may occur if a cold instrument is taken to a considerably warmer environment.
In this case, acclimatize the disconnected instrument for ca. 2 hours at room
temperature.
Avoid direct sunlight
The air humidity should be between 45% and 75%, non-condensing.
Sufficient distance from heat-sensitive materials in area around instrument.
Protect the instrument against high humidity, vapours and dust,
Major display deviations (incorrect weighing results) may be experienced
static electricity accumulations or instable power supply occur. Change
location or remove source of interference.
Avoid static charging of the material to be weighed, weighing container and
windshield
Place the instrument on a firm, level surface.
Avoid jarring during weighing.
MLB_C-BA-e-1431 15
Sample dish
6.2 Unpacking and assembly
Take the moisture meter carefully out of its packaging, remove the plastic jacket and
install it at the designated work space.
The moisture meter is supplied part-assembled. Control whether the delivery is
complete immediately after unpacking the individual parts and assemble the separate
component parts accor di ng to the encl ose d di ag r am.
Dish retainer
Removal aid
Windshield
Windshield base plate
Put on the dish retainer carefully, ensuring correct positioning:
Level instrument with foot screws until the air bubble of the water
balance is in the prescribed circle.
Check levelling regularly.
16 MLB_C-BA-e-1431
6.2.1 Scope of delivery
• Moisture analyzer, see illustration chap. 2
Serial accessories:
• 10 sample dishes
• Power cable
• Operating manual
6.3 Mains connection
Power supply is provided via the supplied mains cable.
Check, whether the voltage acceptance on the scales is set correctly. Do not connect
the scales to the power grid unless the information on the scales (sticker) matches
the local mains voltage.
Important:
Does the rating match the standard local mains current?
- Do not connect if mains voltages are different!
- If matching, connect the scales.
The moisture analyzer must be connected to a standard socket with earth terminal.
Do not eliminate the protective effect by using an extension lead without earth
terminal. For power supplies from power grids without earth terminals call a specialist
to establish equival ent pr otec ti o n acc or di ng to the relevant installation regulations.
6.4 Switch on/switch off device
Press the ON/OFF key. The unit will carry out a self-test. The device is ready for
measuring as soon as 0.000 g appears on the weighing display. If the display
deviates from zero, operate the TARE key.
For short pauses in measurement, switch off device at ON/OFF switch and do not
disconnect from mains .
Stability display
If the display shows the stability display [ ] the balance is in a stable status. If the
status is instable the [ ] display disappears.
Balance zero display
Should the balance not display exactly zero despite empty balance pan, wait for
stability display and press the TARE button. The balance start with resetting to zero
and the symbol "a" will appear.
MLB_C-BA-e-1431 17
6.5 Connection of peripheral devices
Before connecting or disconnecting of additional devices (printer, PC) to the data
interface, always disconnect the balance from the power supply.
With your balance, only use accessories and peripheral devices by KERN, as they
are ideally tuned to your balance.
6.6 Initial Commissioning
In order to obtain exact results with the electronic balances, your balance must have
reached the operating temperature (see warming up time chap. 1).
During this warming up time the balance must be connected to the power supply
(mains, accumulator or battery).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.
18 MLB_C-BA-e-1431
7 Weigh/tare
Weighing
Switch on with ON/OFF switch.
Place load on and off weighing platform several times before weighing.
Place items to be weighed on platfor m and wait for stabi l it y indi cator [ ] to
appear; take weight reading.
Tare
Tare device with TARE button if using a weighing container. The t a r e wei g ht
is saved until it is del et ed.
Note:
The tare procedure can be repeated as many times as necessary, for
example with initial weighing of several components for a mix (add-on
weighing). The limit is reached when the total weighing range capacity is full.
After removing the taring container the total weight is displayed as negative
display.
Delete tare
Remove weight from scales and press TARE button, the zero display will
appear.
MLB_C-BA-e-1431 19
P1
CAL
Adjustment
P1 01 ECAL
External adjustment
P2
GLP
Best laboratory practice
P3
time
Date/time
P4
rEAd
Basic Settings
P5
Print
RS232-parameters
P5-03 LinE_t
Output interval
1/2/3/5/10/20/30/60/120/180
P6
other
Other useful functions
P6-01 Libr
Program library
YES/no
8 Menu
The menu is arranged in a user and operator menu. The scales are adjusted to user
requirements in the user menu; setting of drying parameters is carried out in the
application menu. The user menu is displayed using the F switch, the application
menu is displayed using the MENU switch.
User menu
P1 02 tCAL Adjustment test
P1 03 tE_CAL Temperature adjustment
P1 04 CALr Record print out yes/no
P1 05 tSt_Co Temperature calibration
P2 01 USr User
P2 02 PrJ Project
P2 03 Ptin Print time yes/no
P2 04 PdAt Datum yes/no
P2 05 PUSr User yes/no
P2 06 PPrJ Print project yes/no
P2 07 PId Print serial no. yes/no
P2 08 PFr Frame printout yes/no
P3 01 StinnE Date format M/T/J; T/M/J
P3 02 SdAtE Time format 12 h; 24 h
P4-01 AuE Filter settings Stand/Slouu/FASt
P4-02 Auto Auto zero On/OFF
P5-01 bAud Baud rate 2400/4800/9600/19200
P5-02 PStb Show unstable weight readings YES/no
P5-04 Prn-Pc Output to PC YES/no
P6-02 bL Display background illumination On/Aut/OF
P6-03 bLba Brightness of display No/10/20/30/40/50/60/70/80/90/100
P6-04 bEEP Key sound yes/no
P6-05 PrnS
P6-06 Preuer Not document ed yes/no
Print out “Current menu
settings”
20 MLB_C-BA-e-1431
Navigation in the menu:
Button
Function in Menu
• Enter user men u
• Scroll to next page
• Reduce digit
• Scroll back
• Change parameter value
• Increase digit
• Submenu/Parameter call-up
• Shift selection of number to be changed to the right
• Exit sub-menu/parameter, return to menu
Storing / jumping back to weighing mode
Any changes made in the balance memory will only be saved when the storing
process is complete.
To achieve this, press the key several times until “SAVE“? appears.
Any changes carried out are stored by pressing the key.
To cancel changes, press the key.
Afterwards the balance automatically jumps back to weighing mode.
• Shift selection of number to be changed to the left
• Confirm/save settings
• Quit function without changing the settings
• Back to menu
MLB_C-BA-e-1431 21
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