KERN mlb-c Operating Manual
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KERN mlb-c Operating Manual

Electronic moisture analyser
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Operating manual
Electronic Moisture Analyser
KERN MLB_C
Version 3.1
03/2014
GB
KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
MLB_C-BA-e-1431

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  • Page 1 KERN & Sohn GmbH Ziegelei 1 Phone: +49-[0]7433- 9933-0 D-72336 Balingen Fax: +49-[0]7433-9933-149 E-Mail: info@kern-sohn.com Internet: www.kern-sohn.com Operating manual Electronic Moisture Analyser KERN MLB_C Version 3.1 03/2014 MLB_C-BA-e-1431...

  • Page 2: Table Of Contents

    KERN MLB_C Version 3.1 03/2014 Operating manual Electronic Moisture Analyser Contents TECHNICAL DATA ..................... 5 Dimensions ..........................6 DEVICE OVERVIEW ................... 7 Keyboard overview ........................8 Display overview (during measurement) ................9 BASIC INFORMATION (GENERAL) ..............10 Proper use ..........................10 Improper Use ..........................
  • Page 3 Switch on/switch off device ....................17 Stability display ........................... 17 Balance zero display ........................... 17 Connection of peripheral devices ..................18 Initial Commissioning ......................18 WEIGH/TARE ....................19 MENU ........................ 20 P1 CAL - ADJUSTMENT .................. 22 P1-01 External adjustment ....................22 P1-02 Adjustment test ......................
  • Page 4 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 ........................

  • Page 5: Technical Data

    1 Technical data 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 0,01 % Weighed portion < 1.5 g Display accuracy 0,001 % Weighed portion >...

  • Page 6: Dimensions

    • Automatic 1 (shut-down at change of weighing value 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) •...

  • Page 7: Device Overview

    2 Device overview Pos. Description Heated cover Viewing panel Halogen lamp Sample dish Windshield Removal aid Display Keyboard Adjustable foot MLB_C-BA-e-1431...

  • Page 8: Keyboard Overview

    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 •...

  • Page 9: Display Overview (During Measurement)

    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...

  • Page 10: Basic Information (General)

    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.

  • Page 11: Basic Safety Precautions

    4.1 Pay attention to the instructions in the Operation Manual Carefully read this operation manual before setup and commissioning, even if you are already familiar with KERN balances. All language versions contain a non-binding translation. The original German is binding.
  • Page 12 CAUTION The moisture analyzer operates using heat! 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.

  • Page 13: Transport And Storage

    5 Transport and storage 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.
  • Page 14  Secure all items against slipping or damage. MLB_C-BA-e-1431...

  • Page 15: Unpacking, Setup And Commissioning

    6 Unpacking, Setup and Commissioning 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.

  • Page 16: Unpacking And Assembly

    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 according to the enclosed diagram.

  • Page 17: Scope Of Delivery

    6.2.1 Scope of delivery Serial accessories: • Moisture analyzer, see illustration chap. 2 • 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.

  • Page 18: 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.

  • Page 19: Weigh/Tare

    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 platform and wait for stability indicator [ ] to appear; take weight reading.  Tare Tare device with TARE button if using a weighing container.

  • Page 20: Menu

    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.
  • Page 21 Navigation in the menu: Button Function in Menu • Enter user menu • 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 •...

  • Page 22: P1 Cal - Adjustment

    9 P1 CAL - adjustment As the acceleration value due to gravity is not the same at every location on earth, each balance must be coordinated - in compliance with the underlying physical weighing principle - to the existing acceleration due to gravity at its place of location (only if the balance has not already been adjusted to the location in the factory).

  • Page 23: P1-02 Adjustment Test

    9.2 P1-02 Adjustment test Here, deviation from the last adjustment is determined. Only a check will be carried out, no variables will be changes. Wait until the weighed value for the required adjustment weight appears. Place adjustment weight in the centre of the sample dish. The results of the adjustment test will be displayed.

  • Page 24: P1-03 Temperature Adjustment

    9.3 P1-03 Temperature adjustment We recommend occasionally checking the temperature level of the device using the temperature calibration set MLB-A12. The temperature is measured at three points and can be adjusted at these temperature points. Before you do this, allow the device to cool down for at least 3 hours after the last heating phase.
  • Page 25 Preparation:  Switch off instrument.  Remove sample dish, dish holder, removal aid and windshield.  Install the temperature-calibration set acc. to fig.  Switch on instrument. Begin temperature adjustment:  Close heating hood and carry out temperature calibration as described in the following.
  • Page 26 Keep pressing until tE_CAL appears. The first heating phase is starting. The current temperature is displayed. Temperature calibration of first point will take 8 min after which you will hear an acoustic signal. Compare flashing temperature display with the temperature reading displayed on the thermometer.
  • Page 27 Confirm input, the third heating phase is starting. Temperature calibration of the third point will take 8 min after which you will hear an acoustic signal. Compare flashing temperature display with the temperature reading displayed on the thermometer. If the two values do not match, correct with the help of the navigation buttons ...

  • Page 28: P1-04 Adjustment Record Print-Out

    9.5 P1-04 Adjustment record print-out If the function is activated, your adjustment data will automatically be printed-out after every adjustment. Function activated Function deactivated Return to weighing mode: Press the ESC-key repeatedly until the query ”SAVE?“ appears. Confirm query by pressing the PRINT-key or reject it by pressing the ESC- key.

  • Page 29: P1-05 Temperature Calibration

    9.6 P1-05 temperature calibration This function is used to measure the temperature of the instrument. Only a check will be carried out, no variables will be changed.  For preparation/installation of temperature calibration set, see chap. 9.3.  Begin temperature calibration Keep pressing until tSt_Co appears.
  • Page 30 Confirm entry. If an optional printer is connected, a record will be produced. Printout example KERN YKB-01N: Return to weighing mode: Press the ESC-key repeatedly until the query ”SAVE?“ appears. Confirm query by pressing the PRINT-key or reject it by pressing the ESC-key.

  • Page 31: P2 Glp (Good Laboratory Practice)

    10 P2 GLP (Good laboratory practice) Quality assurance systems require printouts of weighing results as well as of correct adjustment of the balance stating date and time and balance identification. The easiest way is to have a printer connected. • P2-01 USr/P2-02 PrJ Input of user/project (max 6 characters) The first digit is flashing...
  • Page 32 The contents of the data output is set in menu options P2-03 to P2-08 (for setting, see P2-01 USr/P2-02 PrJ). All parameters set to “YES“ will be issued. P2-03 Ptin Printout time P2-04 PdAt Printout date P2-05 PUSr YES User print-out (input via P2-01 USr) P2-06 PPrJ Project print-out (input via P2-02 PrJ) P2-07 PId...

  • Page 33: P3 Setting Date/Time

    11 P3 Setting date/time • P3-01 tinnE setting time The variable for the amount is changed using the   keys. Press the   keys, to select the digit on the left/right (the relevant current digit flashes). Confirm by . •...

  • Page 34: P4 Basic Settings

    12 P4 Basic settings • P4-01-AuE –filter settings Press repeatedly. AuE = StAnd Standard, normal environmental conditions AuE =Slouu Low sensitivity but slow, not a calm location (e.g. vibration) AuE =Fast High sensitivity but fast, very calm location MLB_C-BA-e-1431...
  • Page 35 • P4-01-AuE –Autozero This function is used to tare small variations in weight automatically. In the event that small quantities are removed or added to the material to be weighed, incorrect weighing results can be displayed due to the “stability compensation“.

  • Page 36: P5 Rs 232 Interface

    13 P5 RS 232 interface • P5-01-bAud – Baud rate setting • P5-02-PStb – output of stable/unstable scales reading Output for stable weighing value only. Output even for unstable weighing value. MLB_C-BA-e-1431...
  • Page 37 • P5-03-LinE_t – output interval setting Return to weighing mode: Press the ESC-key repeatedly until the query ”SAVE?“ appears. Confirm query by pressing the PRINT-key or reject it by pressing the ESC- key. • P5-04-Prn_Pc – data output format during measurement MLB_C-BA-e-1431...
  • Page 38 Setting „No“ Only the measurement reading will be produced. Complete record print out with header and footer Printout examples KERN YKB-01N Return to weighing mode: Press the ESC-key repeatedly until the query ”SAVE?“ appears. Confirm query by pressing the PRINT-key or reject it by pressing the ESC- key.

  • Page 39: P6 Other Useful Functions

    14 P6 Other useful functions • P6-01-Libr – activate/deactivate program library for drying programs Function activated Function deactivated • P6-02-bl – display backlight bl = ON Background illumination on bl = OFF Background illumination on bl = Aut Background illumination automatically switched off 10 seconds after achieving stable weighing value.
  • Page 40 • P6-03 – display brightness Maximum brightness Minimum brightness No brightness • P6-04-bEEP – Switch on/off keypad tones Keypad tones on Keypad tones off MLB_C-BA-e-1431...
  • Page 41 • P6-05-PrnS – output of set weighing parameters via RS 232 interface PRnS MLB_C-BA-e-1431...

  • Page 42: Operator Menu - Moisture Analysis

    15 Operator menu – moisture analysis To carry out user-defined drying processes, the device has space for up to 20 different, operator-defined drying programs. Simply invoke and start the finished programs from the library (See chap. 15.2). How to set drying parameters without using the program library is describes in the chapter below.
  • Page 43 • Shutoff criterion Selection of criteria with which drying will be completed is made here Call-up user menu The pictogram for the “shut-down criteria” drying parameter with its current setting is flashing. Parameter selection, see Tab. 1 Tab. 1: “Shut-down criteria” parameter selection Shutoff criterion mg per time Drying is shut off automatically when the weight loss for the set time is smaller than the number of set digits (1 digit = 1mg)
  • Page 44 Time setting for “timed shut-down criteria” selection The variable for the amount is changed using the   keys. Press the   keys, to select the digit on the left/right (the relevant current digit flashes). Press 3x MLB_C-BA-e-1431...
  • Page 45 • Heating profiles Selection of suitable heating program is made here, as is input of drying temperature and hearing time. Heating program selection, see Tab. 2 Drying temperature input Press 3x MLB_C-BA-e-1431...
  • Page 46 Tab. 2: “Heating profile” parameter selection Standard drying Standard drying is the most-used heating profile. This heating profile is suitable for the majority of substances. Drying temperature tmP adjustable from 40°C-160°C. Quick drying This heating profile is usable for samples with a moisture content of approx. 5% - 15%.
  • Page 47 Phased drying Phased drying can be used for substances which display special behaviour when heated. The individual steps are freely selectable regards duration and temperature rising step. The adjustable parameters include drying temperature tmP, heating steps tmP1 and tmP2, and warming up times t1 and t2 between the individual steps.
  • Page 48 MLB_C-BA-e-1431...
  • Page 49 • Result display Here is where the unit of the measurement results is defined. Parameter selection, see Tab. 3 Press 2 x MLB_C-BA-e-1431...
  • Page 50 Tab. 3: Parameter selection “Display after drying” Display shows the moisture content of the sample % M: Moisture content as a percentage of the wet weight (W = wet weight = starting weight = 100%) Wet weight W – dry weight D M [0…-100%] x 100% before drying...

  • Page 51: How To Implement Drying

    How to implement drying After setting the desired drying parameter for the sample to be tested, you can now start the drying process. Place removal aid with empty sample dish on the sample dish retainer. Make sure that the sample dish is resting flat on the sample dish retainer.
  • Page 52 The display can be switched to the various units for measurement results using When drying is finished, you will hear an acoustic signal and the heating will be shut off. The display shows the measured result in the set unit. Open lid and remove the sample with the help of the removal aid.
  • Page 53 Example of printed output: --------------------Drying start---------------- Date 2008/06/16 Current date Time 10:15:03 Current time Balance Id 209198 Serial no. Program nb. Set drying program, see chap. 15.2 Profiles Standard Dry temp. 122 °C Set drying parameters, see Switch off Automatic 3 chap.
  • Page 54 The drying process can be aborted by pressing START/STOP followed by PRINT. When shut-down criteria setting = manual End drying process by pressing START/STOP. MLB_C-BA-e-1431...

  • Page 55: Moisture Analysis Using The Program Library

    15.2 Moisture analysis using the program library The device has a memory for drying programs! 20 drying programs can be allocated to this memory (library). Simply invoke and start the finished programss from the library. Activate program library “P6-01-Libr” Press the ESC-key repeatedly until the query ”SAVE?“...

  • Page 56: Select Drying Parameters And Carry Out Drying

    Select drying parameters and carry out drying When program library is activated, select desired drying program as follows. The current drying program no. will appear. Select desired drying program no. After setting the desired drying program for the sample to be tested, you can now start the drying process.

  • Page 57: General Information Concerning Moisture Analysis

    The radiation applied in the KERN MLB penetrates mainly the sample in order to be transformed inside it into heat energy that is, warming from the inside to the outside. A minor amount of radiation is reflected by the sample, a reflection that is less in dark samples than in light-coloured ones.

  • Page 58: Preparing A Sample

    16.4 Preparing a sample Prepare one sample at a time for measuring. This prevents the sample from exchanging moisture with its surroundings. If several samples have to be taken at the same time, they should be packed in airtight boxes so that they do not undergo changes during storage.

  • Page 59: Sample Material

    16.5 Sample material Easy to determine are usually samples with the following characteristics: Grainy to powdery, pourable solids Thermally stable materials, emitting the moisture to be determined easily without other substances evaporating at the same time Liquids that vaporize to leave a dry substance without developing a film Difficult to determine may be samples that are: Glutinous or sticky Become incrusted easily or tend to form a film...

  • Page 60: Drying Temperature

    16.7 Drying temperature Bear in mind the following factors when setting the drying temperature: Surface of the sample: Compared with powdery or grainy samples, liquid and spreadable samples have a smaller surface for the transmission of heat energy. The use of a glass fibre filter improves the heat application. Colour of sample: Light-coloured samples reflect more heat radiation than dark ones and therefore require a higher drying temperature.

  • Page 61: Recommendations / Guidelines

    Margarine Milk powder Red wine 97.4 15-20 Sunflower oil 10-14 Sugar 11.9 Milk Flour 8-10 12.5 Cement 8-12 Paper You will find further examples taken from actual use in our application manual, available from the KERN home page (www.kern-sohn.com). MLB_C-BA-e-1431...

  • Page 62: Data Output

    17 Data output Pin allocation of the balance output plug (front view): Pin 2: Receive data Pin 3: Transmit data Pin 5: Signal ground Interface cable:  Balance - printer 3 (TxD) 1 (RxD) 5 (GND) 3 (GND) 7 - 8 jumpered ...

  • Page 63: Remote Control Instructions

    17.1 Remote control instructions Commands Function R CR LF Reset to manufacturer setting - reset PC CR LF Command to call up the values of the balance S CR LF Transfer of stable weighing values in standard weighing unit SI CR LF Transfer of instable weighing values in standard weighing unit SU CR LF Last stable measuring value...

  • Page 64: Servicing, Maintenance, Disposal

    18 Servicing, maintenance, disposal Before any maintenance, cleaning and repair work disconnect the appliance from the operating voltage. 18.1 Cleaning + Only carry out cleaning tasks when the equipment has cooled down. Sample dish Dish retainer Removal aid Windshield Draft protection base plate Please do not use aggressive cleaning agents (solvents or similar agents), but a cloth dampened with mild soap suds.
  • Page 65 Clean temperature sensor Temperature sensor Clean the same way, as described above. Ensure the emitter is not touched or damaged in any way. MLB_C-BA-e-1431...

  • Page 66: Change Fuse

    + Swap fuse as shown in illustration. 18.3 Servicing, maintenance  The appliance may only be opened by trained service technicians who are authorized by KERN.  Ensure that the balance is regularly calibrated, see chap. Monitoring of test resources.

  • Page 67: Instant Help

    19 Instant help Fault Possible cause • The display unit is not switched on Display is not lit up. • The mains supply connection has been interrupted (mains cable not plugged in/faulty) • Power supply interrupted • Fuse has blown The display does not change when a sample is being loaded •...

  • Page 68: Declaration Of Conformity

    EN 61010-2-010: 2003 Datum 30.10.2013 Signatur Date Signature Ort der Ausstellung 72336 Balingen Albert Sauter Place of issue KERN & Sohn GmbH Geschäftsführer Managing director KERN & Sohn GmbH, Ziegelei 1, D-72336 Balingen, Tel. +49-[0]7433/9933-0 Fax +49-[0]7433/9933-149, E-Mail: info@kern-sohn.com, Internet: www.kern-sohn.com MLB_C-BA-e-1431...

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