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 Operating instructions Electronic Moisture Analyzer KERN DLB_A Version 1.
GB KERN DLB_A Version 1.1 02/2015 Operating instructions Electronic Moisture Analyser Contents 1 T ec hnic al data .................................................................................................... 4 2 Applianc e overview ............................................................................................ 6 2.1 Keyboard and display overview ...................................................................................................
10.1 How to implement drying.............................................................................................................32 10.1.1 Moisture analysis with drying program PrG1 – PrG5 .................................................................33 10.1.2 Moisture analysis with drying program PrG time ........................................................................37 10.1.3 Moisture analysis with drying program PrG Auto Mode ...........................................................
1 Technical data Data Radiator Temperature range DLB 160-3A Halogen (1 x 400 W) 35°C - 160°C Choice of steps at 1°C Maximum load (Max) 160 g Warm-up time 120 min Minimum for drying 0.5 g Weighing mode 0.001g Moisture analysis mode 0.01 % Weighing mode 0.001g Readability (d) Reproducibility Moisture analysis mode Linearity Stabilization time (typical) Recommended adjustment weight, not added (class) Environmental conditions 4 Weighed in quantity 10 g: 0.03 % ± 0.003 g 4 sec.
Shutoff criterion 1. Time mode Drying is finished after the set time, adjustable 1 – 99 minutes. 2. Auto mode Drying is completed, when the set weight value per time unit is lower than the nominal value, 0.1 – 9.9 % loss of weight adjustable.
2 Appliance overview Pos.
5 4 6 3 2 1 7 1. Plug-in connection cable „Balance / Heating top“ 2. Connection net adapter „Balance“. 3. Current supply „Heating top“. 4. RS 232 interface 5. Plug-in connection cable „Balance / Heating top“ 6. Main switch „Heating top“ 7.
9 11 10 8 8. Housing screws 9. Housing screws (for access remove the foot screws) 10. Adjustable foot screws 11.
2.
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. This could damage the instrument. Never operate device in explosive environment.
3.5 Danger Information Individual parts of the case (e. g. the ventilation grids) may heat up considerably during operation. For this reason, please touch the device only at the designated handles. Sample materials developing aggressive vapours (e. g. acids) may cause corrosion problems on some parts of the device. The moisture meters should mainly be used for drying aqueous substances. Explosion prone, flammable samples must not be analysed using the moisture meter.
4 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 appliances. 4.2 Personnel training The appliance may only be operated and maintained by trained personnel. 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.
On the installation site observe the following: 1. Avoid extreme heat as well as temperature fluctuation caused by installing next to a radiator or in the direct sunlight; 2. Remove explosion prone, easily flammable material in the immediate vicinity. Emerging vapours, sample dish and all parts of the sample chamber are hot! 3. Place the device on a firm, level surface. 4. Major display deviations (incorrect weighing results) may be experienced should electromagnetic fields (e.g.
6.2 Unpacking and erection Take the appliance carefully out of its packaging, remove the plastic jacket and install it at the designated work space. The appliance is supplied part-assembled. Immediately after unpacking check if the delivered items are complete. Assemble the separate component parts according to their sequence. 1. 2. 3. 4. 1. Put cover into the weighing chamber. 2. Put on the dish retainer carefully. 3. Position removal aid in a way that the handle fits under the groove of the cover.
6.2.1 Scope of delivery Serial accessories: 6.3 • Moisture analyzer, see chap. 2 • 10 sample dishes • Power cable • Mains adapter • Connection cable „Balance / Heating top“ • Operating instructions Mains connection 2 1 1. Power is supplied to the balance via the external power unit. The stated voltage value must be the same as the local voltage. Only use original KERN mains adapters. Using other makes requires consent by KERN.
2. Power supply to the heating top is provided via the supplied mains cable. Do not connect the appliance to the power grid unless the information on the appliance (sticker) matches the local mains voltage. To switch on, press the main switch on the rear side of the appliance. 3. Attach the connection cable balance / heating top. 3 The appliance must be connected to a standard socket with earth terminal. Do not eliminate the protective effect by using an extension lead without earth terminal.
7 Weighing Start-up 1. In stand-by mode (see chap. 6.3) press ON/OFF button. As soon as the weight display appears, the balance is ready for weighing. Switching Off 2. Press the ON/OFF button, the balance returns into standby mode. Simple weighing 3. Place goods to be weighed on balance. 4. Wait until the stability display appears [] 5. Read weighing result. Taring 6. Place the weighing box and press the TARE button. „0-t“ is displayed. 7. After standstill control the zero display appears.
8 Adjustment 8.1 Adjust balance 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).
8.2 Calibrate / adjust temperature We recommend sometimes to check the temperature value of the device using the optional temperature calibrating set DLB-A01N. Before you do this, allow the device to cool down for at least 3 hours after the last heating phase. Preparation: Install the temperature-calibration set acc. to illustration. 1. Switch-on the drying unit on the rear side. Close heating cover.
Invoke service function: In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Release the button and the menu item “units“ will appear. Press repeatedly the MENU button until „Service“ will be displayed. Confirm by pressing the PRINT button. Select the required settings by pressing the MENU button Calibration of temperature, see chap. 8.2.1 Adjustment of temperature, see chap. 8.2.
8.2.1 Calibration of temperature value During temperature calibration only a check is carried out, i.e. no values are changed. Invoke service function „Tmp test“, see chap. 8.2 Confirm by pressing the PRINT button. The current setting will be displayed. Use the navigation buttons to select the temperature during the check, available 35- 160°C, e.g. 120°C. Confirm using the PRINT button, the appliance heats up to the set temperature. After approx.
8.2.2 Adjustment of temperature value The temperature is measured at two selectable points and it is possible to correct it there. Invoke service function „Tmp Adj“, see chap. 8.2 Confirm by pressing the PRINT button. The current setting for the first temperature point is displayed. Or leave it on factory setting 80°C or select a desired temperature with the help of the navigation buttons (available 50130°C). Confirm with the PRINT button, the first heat-up phase is started.
9 Appliance configuration Via the configuration menu the appliance can be individually adapted to your weighing needs. Navigation in the menu Access to menu In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Release the button, the first menu point „bAud rt“ is displayed. How to select menu items Using the MENU button the individual menu items can be selected one after the other.
Menu overview Menu item Baudrate (siehe Kap. 9.1) Display bAud rt Selection br 1200 Description br 2400 br 4800 br 9600 Automatic zero point correction (see chap. 9.2) Auto 0 Au0 OFF Au0 1 Auto Zero range ± ½ digit Au0 2 Auto Zero range ± 3 digits Au0 3 Auto Zero range ± 7 digits Au0 3E Filter (see chap. 9.3) Stability display (see chap. 9.4) Background illumination of the display (see chap. 9.
Description of individual menu items: 9.1 Baud rate In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Acknowledge using PRINT button, the current setting is displayed. Use the navigation buttons to select the desired setting. Take over selection using the PRINT button. Weighing balance returns to menu. Either make more settings in the menu or go back to weighing mode as follows.
9.2 Auto Zero Under this menu item the automatic zero point correction can be switched on or off. In switched-on-state the zero point is automatically corrected at drift or when dirty. Note: 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“. (e.g. slow flow of liquids from a container placed on the balance, evaporating processes).
Use the navigation buttons to select the desired setting. Au0 OFF Au0 1 Au0 2 Au0 3 Au0 3E = Auto Zero switched off = Auto Zero range ± ½ digit = Auto Zero range ± 3 digits = Auto Zero range ± 7 digits = Auto Zero range ± 7 digits in the whole weighing range Take over selection using the PRINT button. Weighing balance returns to menu. Either make more settings in the menu or go back to weighing mode as follows. Press the MENU button and keep it pressed until the acoustic signal gets mute.
9.3 Filter This menu item allows the balance to be set according to specific ambient conditions and measuring purposes. In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Press MENU button repeatedly Acknowledge using PRINT button, the current setting is displayed. Use the navigation buttons to select the desired setting. Filter 1: Setting for dispensing Filter 2: The balance reacts quickly and in a sensitive manner, very quiet set-up location.
9.4 Standstill control display In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Press MENU button repeatedly Acknowledge using PRINT button, the current setting is displayed. Use the navigation buttons to select the desired setting. Stab 1: Standstill control fast / very quiet set-up location Stab 2: Standstill control fast + exact / quiet set-up location Stab 3: Standstill control exact / very set-up location.
9.5 Display background illumination In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Press MENU button repeatedly Acknowledge using PRINT button, the current setting is displayed. Use the navigation buttons to select the desired setting. ON Background illumination on OFF Background illumination off Auto Backlighting automatically switched off 3 seconds after achieving stable weighing value.
10 Operator menu – moisture analysis Menu selection: PrG 1 PrG 2 PrG 3 PrG 4 The appliance offers the possibility to occupy and to save 5 different drying programs (Prg1, Prg2, Prg3, Prg4, Prg5) with individual drying parameters which may be invoked and started whenever necessary.
10.1 How to implement drying 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. Prior to start the moisture analysis select a suitable drying program. In weighing mode press the MENU button, „Therm“ is displayed. Acknowledge using PRINT button, „Measure“ is displayed.
10.1.1 Moisture analysis with drying program PrG1 – PrG5 After invoking a drying program PrG1, PrG2, PrG3, PrG4 or PrG5 previously stored (see chap. 10.2) you are queried whether the preheating stage „PrH“ shall be connected. If the preheating stage is added, the appliance will heat up to the set temperature before starting the drying. Confirm the selected drying program, e.g. PrG1 (see chap. 10.1) using the PRINT button. The query whether the preheating stage „PrH“ shall be connected, will appear.
Start of moisture analysis: Preheating stage enabled Preheating stage disabled Confirm by the PRINT button, close the sample chamber and wait for the warm-up phase. After reaching the set temperature „ready“ will be displayed. Confirm by pressing the PRINT button. The weight display and the indicator „“ are displayed. Confirm by pressing the PRINT button. The weight display and the indicator „“ are displayed. If required, tare by using TARE button.
During drying the display can be switched over by repeated pressing of the MENU button. Moisture [%] = loss of weight (GV) from start weight (SG) 0 – 100% Dry mass [%] = residual weight (RG) of SG 100% - 0 % ATRO [%] = SG : RG x 100% 100 – 999 % Current temperature Remaining time Using the ON/OFF button drying can be finished at any moment if required. When drying is finished, you will hear an acoustic signal and the heating will be shut off.
When an optional printer is connected, the measurement log will be edited independently on the settings in the menu, see chap. 11.3 For further measurement press the ON/OFF button, the appliance returns into the menu. For exiting the menu press anew the ON/OFF button, the appliance returns into weighing mode Open the sample chamber and remove the sample with the help of the removal aid.
10.1.2 Moisture analysis with drying program PrG time After setting the drying time (available 1 -99 Min) and the drying temperature (available 35 – 160°C), moisture will be analyzed with the help of these two parameters. Confirm by pressing the PRINT button. The currently set drying time is displayed. Use the navigation buttons to select the desired setting. Confirm by pressing the PRINT button. The currently set drying temperature is displayed.
Start of moisture analysis: Preheating stage enabled Preheating stage disabled Confirm by the PRINT button, close the sample chamber and wait for the warm-up phase. After reaching the set temperature „ready“ will be displayed. Confirm by pressing the PRINT button. The weight display and the indicator „“ are displayed. Confirm by pressing the PRINT button. The weight display and the indicator „“ are displayed. If required, tare by using TARE button.
During drying the display can be switched over by repeated pressing of the MENU button. Moisture [%] = loss of weight (GV) from start weight (SG) 0 – 100% Dry mass [%] = residual weight (RG) of SG 100% - 0 % ATRO [%] = SG : RG x 100% 100 – 999 % Current temperature Remaining time Using the ON/OFF button drying can be finished at any moment if required. When drying is finished, you will hear an acoustic signal and the heating will be shut off.
When an optional printer is connected, the measurement log will be edited independently on the settings in the menu, see chap. 11.3 For further measurement press the ON/OFF button, the appliance returns into the menu. For exiting the menu press anew the ON/OFF button, the appliance returns into weighing mode Open the sample chamber and remove the sample with the help of the removal aid. Caution: Caution! Sample dish and all parts of the sample chamber are hot! 10.1.
Start of moisture analysis: Preheating stage enabled Preheating stage disabled Confirm by the PRINT button, close the sample chamber and wait for the warm-up phase. After reaching the set temperature „ready“ will be displayed. Confirm by pressing the PRINT button. The weight display and the indicator „“ are displayed. Confirm by pressing the PRINT button. The weight display and the indicator „“ are displayed. If required, tare by using TARE button.
During drying the display can be switched over by repeated pressing of the MENU button. Moisture [%] = loss of weight (GV) from start weight (SG) 0 – 100% Dry mass [%] = residual weight (RG) of SG 100% - 0 % ATRO [%] = SG : RG x 100% 100 – 999 % Current temperature Remaining time Using the ON/OFF button drying can be finished at any moment if required. When drying is finished, you will hear an acoustic signal and the heating will be shut off.
When an optional printer is connected, the measurement log will be edited independently on the settings in the menu, see chap. 11.3 For further measurement press the ON/OFF button, the appliance returns into the menu. For exiting the menu press anew the ON/OFF button, the appliance returns into weighing mode Open the sample chamber and remove the sample with the help of the removal aid.
10.2 Save the drying programs PrG1, PrG2, PrG3, PrG4, PrG5 The appliance has more than 5 memory locations for often used drying programs. For every drying program the respective drying parameters are stored, which may be invoked and started according to needs (see chap. 10.1.1) In weighing mode press the MENU button, „Therm“ is displayed. Acknowledge using PRINT button, „Measure“ is displayed. Use the navigation buttons „PrG Set“ Confirm by pressing the PRINT button.
Confirm with the PRINT button, the currently set drying mode will be displayed. Use the navigation buttons to select the desired drying mode. Acknowledge using PRINT button, the current setting is displayed. Enter the drying parameters as specified in chap. 10.1.2 (PrG time) and chap. 10.1.3 (PrG Auto). Confirm using the PRINT button, the query „Save no / yes“ appears. Use the navigation buttons to select the desired setting.
11 RS 232C interface The moisture analyser is typically equipped with a RS 232C interface. The following conditions must be met to provide successful communication between the moisture analyser and the printer. • Use a suitable cable to connect the moisture analyser to the interface of the printer. Faultless operation requires an adequate KERN interface cable. • Communication parameters (baud rate, bits and parity) of moisture analyser and printer must match.
11.3 Menu settings „Serial“ In weighing mode press the MENU button, „Therm“ is displayed. Acknowledge using PRINT button, „Measure“ is displayed. Use the navigation buttons to select „Serial“ Acknowledge using PRINT button, the current setting is displayed. Use the navigation buttons to select the desired setting.
11.3.1 Printout examples (YKB-01N) 1. Menu setting „Serial““Manu PC“ Printout occurs when drying is completed by pressing the PRINT button. Temp. Time: W.Start 130 5 19.998 °C Min g Drying temperature Drying time Start weight W-End: Moist.: 19.994 0.02 g % Residual weight Moisture [%] 2. Menu setting „Serial““Auto PC“ The first part of the printout occurs automatically when drying starts Temp. Time W.Start 130 5 19.
12 General information concerning moisture analysis 12.1 Application In all cases where moisture is added to or removed from products, a fast determination of the moisture content is of enormous importance. For countless products the moisture content is not only a quality feature but also an important cost factor.
12.4 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. To receive reproducible results, spread the sample thinly and evenly on a sample dish.
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12.7 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.
Table of applications: Material ABS (Novodur P2H-AT) Accumulator lead Acryl granulate Activated carbon Activated carbon Sliced pineapple Sliced apple (dry) Sliced apple (humid) Artesan powder Aspartame granulate Bath milk Cotton seed Blue-veined cheese Body lotion Beans Butter Acetyl cellulose Chinese Virility powder CN photographic paper Cornflakes Roof tile mass Roof tile mass Dialysis membrane (Polyethes – polycarbonate) Dialysis membrane (Polyethes – polycarbonate) Indoor sealing compound Dispersion a
Material Setting lotion Setting lotion (extra strong) Hair styling gel Oat flakes Hazelnut cores Hazelnut cores (peeled) Hydranal sodium tatrate – 2 – hydrate Yoghurt Coffee Coffee cream Coffee seed Cocoa Cocoa seed Limestone Potato powder Potato chips Ketchup Silica gel Adhesive Garlic, powder Coal powder Chalk (natural) Crystal sugar Synthetic resin dispersion (diluted) Latex 1 Latex LE 2 Latex LE Latex O44 Lentils Loam soil Loam clay Skim milk powder Low fat curd cheese Corn starch Almonds (caramelised)
Material Paper PA 6 (Ultramide B3WG5) PA 6.
Material Weight Sample (g) Drying temperature ( °C) Drying period (approx.) (min) Moisture % (approx.
14 Service, maintenance, disposal Before any maintenance, cleaning and repair work disconnect the appliance from the operating voltage. 14.1 Cleaning Please do not use aggressive cleaning agents (solvents or similar agents), but a cloth dampened with mild soap suds. Ensure that no liquid penetrates into the device. Polish with a dry soft cloth. Loose residue sample/powder can be removed carefully with a brush or manual vacuum cleaner. Spilled weighing goods must be removed immediately. 14.
15 Instant help Fault Possible cause Display is not lit up. • The display unit is not switched on. • The mains supply connection has been interrupted (mains cable not plugged in/faulty). • Power supply interrupted. Measurement is taking too long • Incorrect setting shutoff criterion Measurement is not reproducible • Sample is not homogenous • Drying time is too short • Drying temperature too high (e.g.
16 Declaration of conformity KERN & Sohn GmbH D-72322 Balingen-Frommern Postfach 4052 E-Mail: info@kern-sohn.de Tel: 0049-[0]7433- 9933-0 Fax: 0049-[0]7433-9933-149 Internet: www.kern-sohn.
