KERN MLS 50-3C Operating Manual
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KERN MLS 50-3C Operating Manual

Electronic moisture analyzer
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Operating Manual
Electronic Moisture analyzer
KERN MLS_C
Version 3.0
11/2013
GB
KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
email: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
MLS_C-BA-e-1330

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Summary of Contents for KERN MLS 50-3C

  • Page 1 KERN & Sohn GmbH Ziegelei 1 Phone: +49-[0]7433- 9933-0 D-72336 Balingen Fax: +49-[0]7433-9933-149 email: info@kern-sohn.com Internet: www.kern-sohn.com Operating Manual Electronic Moisture analyzer KERN MLS_C Version 3.0 11/2013 MLS_C-BA-e-1330...

  • Page 2: Table Of Contents

    KERN MLS_C Version 3.0 11/2013 Operating Manual Electronic Moisture analyzer Table of Contents TECHNICAL DATA ..................... 4 Dimensions ..........................5 DEVICE OVERVIEW ................... 6 Keyboard overview ........................7 Display overview (during measurement) ................8 BASIC INFORMATION (GENERAL) ..............9 Proper use ..........................9 Improper Use ..........................
  • Page 3 USER MENU ..................... 22 P1 Calibration (adjustment) ....................23 P2 GLP (Good laboratory practice) ..................33 8.2.1 P3 Date/time ........................35 8.2.2 P4 display ..........................37 8.2.3 P5 RS-232 ..........................39 8.2.4 P6 output ..........................40 8.2.5 P7 General functions ......................46 OPERATOR MENU –...

  • Page 4: Technical Data

    1 Technical Data MLS 50-3C 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 > 1.5 g...

  • Page 5: 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 6: Device Overview

    2 Device overview Pos. Description Heated cover Viewing panel Halogen lamp Sample dish Windshield Removal aid Display Keyboard Adjustable foot MLS_C-BA-e-1330...

  • Page 7: 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 8: Display Overview (During Measurement)

    2.2 Display overview (during measurement) Display in moisture % Current moisture content in %. Output interval 30 s Unit of measured result Shutoff criterion Heating profile Previous drying time Current status Processing temperature 10. Processing heating profile 11. Target temperature 12.

  • Page 9: 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...

  • Page 10: 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 11 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 12: Transportation & Storage

    5 Transportation & 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 13  Secure all items against slipping or damage. MLS_C-BA-e-1330...

  • Page 14: 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 15: 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 16: Scope Of Delivery

    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 17: Operating The Scales Using Ps Keyboard

    6.7 Operating the scales using PS keyboard Using a PS keyboard will help you to enter numbers and texts faster and easier. Balance keyboard PS keyboard Balance keyboard PS keyboard 7 Menu The menu is arranged in a user and operator menu. Activate the user menu via the F key, the operator menu via the MENU button.
  • Page 18 Date/time P3 01 date format M/T/J; T/M/J P3 02 clock time format 12 h; 24 h P3 03 time P3 04 date P3 05 display time yes/no P3 06 display date yes/no Readout P4 01 filter Extra slow; slow; standard; fast; extra fast P4 02 auto zero yes/no P4 03 temperature...

  • Page 19: Navigation In The Menu

    7.1 Navigation in the menu: Operation/display: Description: The overview for the Operator Menu appears Either P7 02 program library “on“ (See chpt. 9.2.1) Up to 100 different drying processes can be stored in the device. Simply invoke and start the finished processes from the library. P7 02 program library “off”...
  • Page 20 29.12.04 Setup Setup Confirm the setting by pressing the -key; the submenu appears on the display How to change functions and parameters Use the arrow keys to move within and enter into the menu: To select parameters in a function or to increase/decrease the value of a digit or number press the - and -key.
  • Page 21 Any changes made will be saved when returning to weighing mode by using the following saving procedure: Actuate Esc key again, a message will inquire whether you want to save the changes you made. 29.12.04 Einstellungen Save setup ? [Enter/Esc] either To save your changes, press the PRINT-key.

  • Page 22: User Menu

    8 User menu Press the F-key; the main menu appears: 29.12.04 Setup alibration 1. Menu number (P1 - P9) P2 GLP 2. Menu designation P3 D ate/Time P4 Readout 3. Cursor (►) indicates the current P5 RS-232 Printouts menu item Globals Use the cursor (►) to select your setting.

  • Page 23: P1 Calibration (Adjustment)

    8.1 P1 Calibration (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 24 Place the adjustment weight in the centre of the sample dish, then press the PRINT key. If the adjustment was successful, this will be followed by automatic reset to the menu. The ESC key may be used to cancel the adjustment. 29.12.04 Setup Setup...
  • Page 25 Confirm query by pressing the PRINT-key or reject it by pressing the ESC-key. 29.01.08 Setup Setup Saveing... We recommend: Carry out all adjustments as close as possible to the maximum load of the balance. Info about test weights can be found on the Internet at: http://www.kern-sohn.com MLS_C-BA-e-1330...
  • Page 26 03 Calibration test This is used to determine the deviation from the last adjustment. This is only a check, i.e. no values are changed. 29.12.04 Setup Setup Press the arrow keys ( ), to select “03 Cal. test“. Einstellungen Calibration check Cear the pan Press ...
  • Page 27 06 Temperature calibration We recommend occasionally checking the temperature level of the device using the temperature calibration set MLB-A12. Preparation:  Switch off instrument.  Remove sample dish, dish holder, removal aid and windshield.  Install the temperature-calibration set acc. to fig.
  • Page 28 Begin temperature calibration:  Close heating hood and carry out temperature calibration as described in the following.  On the temperature calibration set switch- on the digital thermometer by the ON/OFF button. Press the arrow keys ( ), to select “06 Drying test “...
  • Page 29 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. After ineffective temperature calibration you will have to carry out temperature adjustment;...
  • Page 30 04 Temperature adjustment 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. For preparation/installation of temperature calibration set( MLB-A12) , see function "06 Temperature calibration“...
  • Page 31 Temperature calibration of third point will take 8 min Setup Setup 29.01.08 after which you will hear an acoustic signal Temperature calibration Set temp. value [°C] 3 point 00:00 Enter the temperatur value as indicated on the Setup Setup 29.01.08 external thermometer with the help of the navigation Temperature calibration buttons ...
  • Page 32 05 Report printout This menu point is used to enable the function for printing your adjustment data. Press the arrow keys ( ), to select “05 Print report“ 29.12.04 Setup Setup Press the -key; the current menu item blinks. Press the arrow keys ( ), to select the desired settings: Report printout disabled Report printout enabled...

  • Page 33: P2 Glp (Good Laboratory Practice)

    8.2 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. Definition of a standard log: Operation Display 29.12.04...
  • Page 34 All settings that are supposed to be printed must be activated with "1 / yes" Example 1: Adjustment printout Printout time Date : 18.01.13 Printout date Time : 10:41:13 User printout User : Mustermann Project printout Project : AB/007 ID-printout Balance no.

  • Page 35: P3 Date/Time

    8.2.1 P3 Date/time Under this menu item you can set output and format of time and date. Operation Display 29.12.04 Setup alibration P2 GLP Call up menu item "P3 Date/time" (see chap. 7.1) P3 D ate/Time P4 Redout Press  button P5 RS-232 Printouts Globals...
  • Page 36 03 Time Setup 29.12.04 P 3 01 Date format DA/M O/YR Press the arrow keys ( ), to select “03 Time“. Time format 2 4 S td . Time ******** Func tion ******** Date Func tion Press  button Disp. time 06 Disp.

  • Page 37: P4 Display

    05/06 Overlay of time/date on display Press the arrow keys ( ), to select “05/06 display. Setup 29.12.04 Select time/date“ . P 3 01 Date format DA/M O/YR Time format 2 4 S td . Time ******** Func tion Press the  key; the current menu item blinks ******** Date Func tion...
  • Page 38 02 Auto zero Press the arrow keys ( ), to select “02 Auto zero“. Setup Setup 29.12.04 Press the -key; the current menu item blinks Press the arrow keys ( ), to select among the settings below: 0 Deviations from the Zero display are not automatically tared.
  • Page 39 8.2.3 P5 RS-232 In this menu item you can save your settings for the interface. Operation Display Setup alibration Call up menu item "P5 RS-232" (see chapt. 7.1) P2 GLP P3 D ate/Time P4 Redout Press  button P5 RS-232 Printouts Globals 01 - 08...

  • Page 40: P6 Output

    8.2.4 P6 output In this menu item you can select between 5 different types of data output: Operation Display Call up menu item "P6 Output" (see chapt. 7.1) Setup alibration Press  button P2 GLP P3 D ate/Time P4 Redout P5 RS-232 Printouts Globals...
  • Page 41 Example in drying mode: ------------------- Start drying------------------- Program nb : 1 Name : Floar 100  Profile : Standard Dry temp. : 120 °C Switch off : Automatical 3 Header Result : Moisture contents - %M Printout int : 30 s Target : None T.
  • Page 42 Text input: • Max. 640 characters • 80 lines • 8 characters per line  After each line confirm your text input using the PRINT-key.  After entering full text press the ESC –key; query appears, whether you want to save your entries.
  • Page 43 Print related variables Printout of 1 character “/” (i.e. in order to print out 1 character /, two // must be entered) CRLF (carriage return line feed) line beginning next line CR (carriage return) line beginning LF (line feed) next line tabulator Next "Text"...
  • Page 44 Parameter No. Text 20 Text 10 21 Text 11 22 Text 12 23 Text 13 24 Text 14 25 Text 15 Example 2: Kern & Sohn GmbH Date: Time: Weight: *****Signature:..*** current mode*** Parameter No. Text 26 Text 16 &...
  • Page 45 Example for text input in drying mode Parameter selection: Header – 2. printout (menu item P6 01header no.) Measured value – 3. Printout (menu item P6 01 line no.) Footers – 4. Printout (menu item P6 01 footnote no.) 2. printout 3.

  • Page 46: P7 General Functions

    8.2.5 P7 General functions Operation Display Setup alibration Call up menu item "P7 Others" (see chapt. 7.1) P2 GLP P3 D ate/Time P4 Readout Press  button P5 RS-232 Printouts Globals 01 – 12 Parameter selection 29.12.04 Einstellungen P 9 01 Password Prog.library Beep...

  • Page 47: Operator Menu - Moisture Analysis

    9 Operator menu – moisture analysis The device has space for up to 100 different, operator-defined drying processes. Simply invoke and start the finished processes (See chpt. 9.2). How to set drying parameters without using the program library is describes in the chapter below.

  • Page 48: Setting Drying Parameters

    9.1.2 Setting drying parameters You can enter parameters for each drying process in the menu, as follows: • Heating profile (temperature, time) • Shutoff criterion • Unit of measured result • Output interval Operation Display To enable the operator menu, press the Menu-key. The first menu item “Profiles“...
  • Page 49 To return to menu, press the PRINT-key. This is where you can store further drying parameters. 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. 2.
  • Page 50  Define Settings are available for selection from 0 to 10 mg in 0.1 mg steps and from 5 seconds to 175 in 5 second steps. Press  key; the cursor (►) marks the adjustable parameter Press the - button anew and the current setting will flash Press the arrow keys (...
  • Page 51 To return to menu, press the PRINT-key. This is where you can store further drying parameters. 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. 3.
  • Page 52 Tab. 1 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% Wet weight W Display shows dry material content of sample as a % D: Dry material content...

  • Page 53: How To Implement Drying

    4. Output interval This is used to set at which interval interim results are to be printed. Press the  -key; the menu item “Printout Interval“ appears Press  button Press the arrow keys ( ), to adjust the printer interval from 1 second to 5 minutes or to determine that no printout is required.
  • Page 54 1. Date 2. Time 3. drying parameters: Heating profile / shutoff criteria / unit of measured result / output interval 4. Processing time 5. Target temperature 6. Processing temperature 7. Graphics showing current status Operation Display Actuate START/STOP-key Place removal aid with empty sample dish on the sample dish retainer.
  • Page 55 Place sample in sample dish Close lid; the device is ready for measuring Drying will start automatically after scales have settled. Drying parameters are shown on the display. MLS_C-BA-e-1330...
  • Page 56 To switch the display to the various units of the measured result, press the M-key. 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.

  • Page 57: Moisture Analysis Using The Program Library

    9.2 Moisture analysis using the program library The device has a memory for drying processes! 99 drying processes can be allocated to this memory (library). Simply invoke and start the finished processes from the library. 9.2.1 Enabling of program library Operation Display Setup...

  • Page 58: Setting Drying Parameters

    9.2.2 Setting drying parameters Operation Display Press Menu-key; library opens Information: The most recent program used is shown in P00 Press the arrow keys ( ), to select “Program No“ Press  -key; parameter options of program appear. Parameter selection is achieved with the help of the arrow keys (...
  • Page 59 Press the arrow keys ( ), to select “Profile“ Press  -button Press the -key anew; the current menu item blinks Press the arrow keys ( ), to select among the heating programs below plus the related parameters Standard • Step-by-step •...
  • Page 60 3. Drying temperature This is used to enter the drying temperature a second time. This setting overwrites the drying time entered under the menu item “Profile“. Press the arrow keys ( ), to select the “Drying Temperature” Press the  -key; currently set temperature flashes Press the arrow keys (...
  • Page 61 Press the arrow keys ( ), to select “Shutoff“ Press the  -key for the current setting to appear Press the -key; the current menu item blinks Press the arrow keys ( ), to select desired shutoff criterion. For further details, see chpt. 9.1.2 “Shutoff Criterion“.
  • Page 62 7. How to enter a target weight for a sample The user can enter a target weight stating a tolerance range for the sample. This entry facilitates the application of identical sample sizes for each drying process. Press the arrow keys ( ), to select “Sample“ Press the ...
  • Page 63 8. Determine and enter corrective factor Certain materials emit more heat than is introduced from the outside. Dark substances for instance absorb heat and falsify measured results. In order to achieve an accurate measured result it is necessary to make a correction. Setting a corrective factor allows the user to correct differences between the set temperature of the moisture meter and the actually measured temperature on the specimen with the help of a temperature calibration set.
  • Page 64 How to enter the determined corrective factor: Press the arrow keys ( ), to select “Corrective Factor“ Press the  -button and the current setting will flash Press the arrow keys, to enter the determined corrective factor Use the  , to select the digit Press the ...
  • Page 65 10. Printing drying parameters If the device is connected to an optional printer the drying parameters settings can be printed out Press the arrow keys ( ), to select “Print“ Press  -key; query “Print Program?“ appears Confirm by pressing the PRINT-key, drying parameters are printed.

  • Page 66: How To Save Drying Parameters

    9.2.3 How to save drying parameters After all drying parameters have been set, press the ESC-key The query “Save Program?“ appears Confirm by pressing the PRINT-key; the drying parameters of the program are saved. The device returns to the program library. If the drying parameters are not saved, press the ESC-key.
  • Page 67 Press START/STOP-key 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. Use the sample retainer at all times as it allows safe working and prevents burns. To help with stabilisation, close lid.
  • Page 68 Place sample in sample dish Close lid; the device is ready for measuring Drying will start automatically after scales have settled. You can read the processing parameters (target temperature, processing temperature, type of calculation etc.) on the display. MLS_C-BA-e-1330...
  • Page 69 To switch the display to the various units of the measured result, press the M-key. 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.

  • Page 70: Storing Measured Results

    10 Storing measured results The device is able to store the most recently carried out measurements (max. 100 measurements). In addition to the measured result, all drying parameters are also stored. When 100 measurements have been allocated to the memory the next measurement (101) will be saved under position 99.

  • Page 71: General Information Concerning Moisture Analysis

    The radiation applied in the KERN MLS 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 72 the same time, they should be packed in airtight boxes so that they do not undergo changes during storage. To receive reproducible results, spread the sample thinly and evenly on a sample dish. Patchy spreads will produce inhomogeneous heat distribution in the sample to be dried resulting in incomplete drying and increased measuring time.

  • Page 73: Sample Material

    11.5 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 74: Drying Temperature

    11.7 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 75: Description Of Heating Profiles

    11.8 Description of heating profiles 4 heating profiles are available, as follows: • Standard • Fast • Soft • Step-by-step drying Standard drying Standard drying is the most frequently used drying process. This type of heating method is suitable for the majority of substances.

  • Page 76: 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). MLS_C-BA-e-1330...

  • Page 77: Data Output

    12 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 clench ...

  • Page 78: Remote Control Instructions

    12.1 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 79: Service, Maintenance, Disposal

    13 Service, maintenance, disposal Before any maintenance, cleaning and repair work disconnect the appliance from the operating voltage. 13.1 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 80 Clean temperature sensor Temperature sensor Clean the same way, as described above. Ensure the emitter is not touched or damaged in any way. MLS_C-BA-e-1330...

  • Page 81: Change Fuse

    + Swap fuse as shown in illustration. 13.3 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 82: Instant Help

    14 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 83: 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 MLS_C-BA-e-1330...

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