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User`s manual of the LB -798 hygrometer - LAB-EL

1. LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 798 8 e it is possible to set the moisture threshold from which the system beeps see chapter Sound signal of the moisture level 2 4 2 Conductivity measurement of the material Conductivity measurement of the material should be carried out as follows e connect hygrometer LB 798 and LB reading panel 796 to the socket labeled C in Figure 1 attached to the socket with the screws included in the plug probe e pour the material into a container to full see chapter Method for filling a container with material e wait for the stabilization of temperature if the material has a different temperature than the hygrometer e after turning the hygrometer on when the display will show 798 inscription press Pomiar REZ button the display will read for a moment CAL indicating the auto zeroing capacitance probe do not touch at the time the probe electrode and then some conductivity measurement result in mS m miliSimens meter will display 6 2 e when the display shows alternately with the measurement of conductivity message like this Erb this means that the probe electrodes short circuit too high a conductivity of the material caused by salinity e conductivity of the material should not be confused with the conductivity of water in the material 2 4 3 A method for filling
2. e in the case of materials that can be soaked in a sample should be absolutely dry state also should be sealed e the amount of material approximately 1 5dm3 Calibration of the meter for the new material can also be performed by the User You need for this the LB79x calibration program and appropriate instrumentation scales drier or have another standard meter to measure the moisture content of the material The following part describes how to calibrate the probe LB 798 in order to adapt it to measure the humidity of new materials and the procedure for writing to the memory the characteristics of the materials by means of the LB79x Prior to calibration refer to the operating instructions describing the measurement of moisture in order to properly perform calibration measurements 2 7 1 Entering the calibration mode Entering the calibration is done by selecting the appropriate menu option see Menu Mode Therefore it is necessary e run mode menu and select the menu option Pro e press the TAK YES button to confirm the selection you will go to the calibration mode e calibration mode is indicated by the sign Bs blinking e when the meter is in calibration mode press T RH to start temperature measurement e exit the calibration mode is performed only by pressing the wy off hygrometer button In the calibration mode the display shows the value of the parameter that will be measured during the calibration measurements This p
3. e after the measurement clean and wash the container e metal elements contained in the material increase the result 2 5 Measurement of the material temperature A thermistor temperature sensor is placed in the bottom of the container Measurement of the material temperature should be carried out as follows e connect hygrometer LB 798 and reading panel LB 796 to the socket labeled C in Figure 1 attached to the socket with the screws included in the plug probe e pour the material into a container e if the material has a different temperature than the hygrometer wait for stabilization of temperature e After turning the display shows 798 Press T TH display will briefly read CAL indicating the auto zeroing capacitance probe do not touch at the time the probe electrode and then displays the symbol C and temperature measurement results such as 23 4 e Ifthe measurement result is blinking it means exceeding the measuring range 2 6 Audible signal level of humidity The meter can be set for the humidity threshold alarm sounds The default threshold is 50 if you need a different threshold it can be set in the range 0 199 5 in increments of 0 5 in the following way e start the menu mode and select the bu menu option e confirm the setting with TAK YES button the display shows the currently set threshold humidity by which the sound signal is activated e Now you can change the thresh
4. see chapter Method for filling a container with material wait for the stabilization of temperature if the material has a different temperature than the hygrometer after turning the hygrometer display when the 798 inscription shows press Pomiar POJ button the display will read after a moment CAL indicating the auto zeroing of capacitance probe at the time do not touch the probe electrode and the symbol for the last selected material will show The displayed symbol WS informs that an activity of humidity measurement mode is on by pressing the material button or material button select the material code which moisture has to be measured This code will show up on the display The list of available materials and corresponding codes may be found in an additional annex to the manual Press the Pomiar POJ button again the character will show on the display with some humidity measurement result lower measurement range 21 3 If the measurement result is blinking it means exceeding the measuring range when the display shows alternately with the measurement of humidity message like this EL Peg this means that the probe electrodes short circuit too high a conductivity of the material caused by salinity The measurement result may be incorrect during the measurement of the moisture flashes C this means that the active temperature compensation for material moisture is on
5. dielectric constant of the material ability to measure the conductivity of the material sound signaling of humidity level after crossing preset humidity threshold the hygrometer automatic switch off after 3 minutes of inactivity signaling of the measuring range exceed remembering of the last selected material short circuit signaling of the meter electrodes this way we obtain an unambiguous measurement of humidity Battery low voltage indication e auto zero function when you turn on the meter it is also possible to reset on request 1 1 Elements of the hygrometer Location of elements on the LB 796P panel which are accessible for the user is presented one the Figure 1 LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 798 4 e A 3 5 digit LCD display e B keyboard e C multifunction socket for connecting o LB 798 hygrometer o external thermometer TL 2 796 DB9 C HA LB 796 CE M 12 4 A t mmateriat os NIE 7 7 7 as y Wilgotnosciomierz materia w material lt B hygrometer teri mian 7 rn TEJ Pos h Sonda pojemno ciowa capaticance probe l Sonda rezystancyjna resistance probe wyt T RH i ue materiat material MENU 2 sek ZERO 2 sek wy off pomiar measurement TAK OK NIE ESC NO ere Figure 1 Panel LB 796P view from the keyboard From the bottom there is an acce
6. shown for example LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 798 6 1 2 and after a moment the symbol of connected probe 798 During displaying of these inscriptions there is carried out initial testing of the instrument The meter is equipped with auto off function it activates after 3 minutes after the last pressing of any key on the keyboard and when the result of the humidity measurement has not changed in that time by more than 10 of the measuring range auto off will switch off after 10 minutes regardless of this condition If the hygrometer does not react for attempt to switch off with the keyboard remove the batteries and re insert them back 2 2 Description of the keyboard The reading panel LB 796 is equipped with a 6 button keypad There are two modes of operation e measurement mode button functions are described in black e menu mode button functions are described in blue see Menu Mode In the measurement mode buttons have the following meanings Pomiar POJ Starts measuring humidity Pomiar REZ Starts measuring the conductivity T RH starts measuring temperature materiat material selection scroll forward by one material materia material selection scroll back by one material wyt off turns off the device 2 3 Menu mode From version 2 0 software the meter is equipped with a 6 press button keyboard with the menu mo
7. the measuring FANGE eee seececeeseeeceeeseeeeceeseaeeeeetaeeeeees 15 2 9 3 Signaling an electrodes Short circuit ecceecccccceceeesesneneeeceeeeeesneseeeeeeeseeteeaees 15 2 9 4 Displaying the serial MUMDET 0 ee eee eiis ea n e e e ie 15 2 9 5 Signaling the automatic temperature compensation cee eeeeceeeseeeeeeeteeeeeees 16 2 9 6 Signaling the operation mode of LB 796 as a reading panel 16 2 9 7 Other MESSAGES 5 25 55 rena rera a aana dexdvsasanneacema sea steageaeesouasa save nage EAR 16 2 10 Validation hygrometer readings cccsccscsccccssssscscsscccssscsscscssorosescssescscseeees 17 2 10 1 Resetting the probe to Zero e eee eeccecesseneeecesaceeeseececesseeecessaeeesesaaeeesseaeeeeees 17 a A INOUES OM USE A E E T devengesauunccunasse 17 3 MEASUREMENT SPECIFICATIONS 2 eccceceseeeeeeeeeeeeneeseneeeeeeeneeeeneeeaees 18 LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 798 3 1 1 Description of the hygrometer LB 798 materials hygrometer is designed to measure a moisture of bulk materials especially construction aggregate for example sand grain and other materials with a grain diameter up to several millimeters You can save to the memory the characteristics of the materials of any user up to 50 characteristics using the LB79x Calibration of the meter for the new material may be performed by an User or the LAB EL lab after d
8. 98 meter indications after calibration 2 8 Measurement of the dielectric constant of the material To measure the dielectric constant of the material you have to enter the calibration mode Chapter Calibration meter for new materials and perform measurement as if the moisture in the material is measured In the calibration mode the meter shows the square root of the dielectric constant of the material to obtain the dielectric constant you square increase the measured parameter or press and hold the Pomiar POJ button then the display shows the dielectric constant of the material LAB EL Elektronika Laboratoryjna Laboratory Electronics 14 User manual hygrometer LB 798 15 Another way to measure the dielectric constant of the material is to save to the device characteristics of the material type 1 1 two pairs of points are sufficient humidity parameter 0 0 10 10 do not activate the temperature compensation After creating the characteristic measurement parameter sqrteps square root of the dielectric constant of the material we select the appropriate code by pressing materiat or materiat button for the assigned to sqrteps This way you will not need to enter the calibration mode to measure the dielectric constant of the material 2 9 Displaying an additional information This section describes additional messages which are displayed on the meter 2 9 1 Battery low voltage indication The indication of the batter
9. LAB EL Elektronika Laboratoryjna Sp J Laboratory Electronics ul Herbaciana 9 05 816 Reguty tel 022 7536130 fax 022 7536135 email info label pl internet site http www label pl User s manual of the LB 798 hygrometer Version 1 4 October 2010 from the firmware version 2R0 LB79x program version 1 05 Continuous development of our products sometimes causes need to make changes that are not described in this manual User manual hygrometer LB 798 2 CONTENTS 1 1 DESCRIPTION OF THE HYGROMETER cs seeececeseeeeneeeeeeeeeeeeneeneeeenes 3 1 1 Elements of the hygrometer cccsccccssssssscssssssssssssscscsscscescssssssssssssscsscsssecsonses 3 1 2 Performance of the measurement short description cccsssscrscsocesssesceees 5 2 OPERATION OF THE HYGROMETER cs eeccceeseseseeeeeeeeseeesneeeeeeesenesneaeeees 5 2 1 Switching On and OFF sicvvcssssteccsceceekcbecedescecedeiissescetiscecstedevecceetuscesseoteceasevczsedestesecntace 5 2 2 Description of the Keyboard ccccscsssscsssssscccsscscsssscsessssesscsssccecsescsscscsceeseses 6 2 3 Menu MOTE siideccsdesassacnsnsvassateslebactseisveatansseetoncsussvandeseabavens uboivasnabesterasesebspeaiaseseauceaniye 6 2 Sel Men Op TON Sieen ei a e O EE E E E re E E e eases 6 2 4 Measurement of humidity and conductivity of the material ssccssscssseeseees 7 2 4 1 Measurement of material moisture sesss
10. a container with material The method of electrodes placing in the material has a decisive influence on the accuracy of the measurement of humidity and conductivity of the material First of all the container must be filled to full to obtain the correct measurement result There are two ways to pour material to the container e with manual compaction of the material e without compaction It is important that the material does not create air bubbles that cause a downward deviation of the measurement result For construction aggregates measurement it is necessary to feed the container with a tablespoon by layers at about 2cm compacting aggregate at every layer with a spoon For other materials the material should be filled with gradual manual compacting unless the material is in the form of defined LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 798 9 pellets and does not form air bubbles in this situation the material may be poured without compacting for example for grains Material compacting should be applied for the following materials sand construction aggregates sand slag soil coal dust fine coal copper sulphate Additional information during the measurement e the humidity measurement conductivity to select the sample of the material for the measurement to be hygro representative of the entire sample or need to do some measurements and average mix the measured material
11. arameter should be interpreted as a square root of the dielectric constant of material referred to as sqrteps the measurement should be made in compliance with the all guidelines which are LAB EL Elektronika Laboratoryjna Laboratory Electronics 10 User manual hygrometer LB 798 11 submitted for the moisture measurement especially filling a container with material 2 7 2 Performance of calibration measurements Meter calibration for the new material is based on performance of the parameter measurement with the LB 798 meter in the calibration mode and the measurement of moisture material with the other device which is considered by the User as a model device for example by the drying weighing method according to the PN EN ISO 12570 standard for construction materials and products PN ISO 11465 or PN ISO 11461 for soil or with any other standard meter for at least two different moisture material measurements which would create a measurement range Ideally the humidity measured values are separated i e once the material which is considered to be almost dry is measured then we measure the material which is considered as a wet one The calibration results consists of a table with moisture material values and material parameter values as it is presented in the Table 1 fe Oe Table 1 Sample calibration table for the new material The greater the number of measurement points the better the later accuracy The
12. calibration should be performed for the material temperature as close as possible to 20 degrees because of the correctness of automatic temperature compensation The measurement of parameter with averaging is recommended i e for a specific material moisture the several measurements should be performed and the average calculated If measurements are made using drying weighing method the best way would be to dry material completely 0 humidity to measure the value of the parameter sqtreps for dry material the first calibration point and then gradually add water while stirring the material this way new calibration points will be created up to full saturation of the material with water 2 7 3 Processing of measurement results After the calibration measurements there should be drawn characteristics of the material i e the function of humidity parameter for example in Excel This function should be increasing In general the large part of it should be a straight line with the curvature on the endings for the measuring ranges for small and large humidities may be higher The shape should be visually assessed and for example the measures which indicate their error during measurement rejected or if the data points are more than 15 You may calculate the approximating function by for example polynomials and with its help generate points evenly to write to the device An extrapolation of characteristics is acceptable when at the end of
13. de Button functions in the menu mode are marked in blue e MENU 2 sec to start the menu mode you may press it and hold for 2 seconds until the menu mode starts release of the button earlier than 2 seconds will turn off the meter the function of this button is shared with a button which turns off the meter e f up arrow is used to select menu options or to set various parameters in the menu increasing parameter e down arrow is used to select menu options or to set various parameters in the menu decreasing parameter e TAK YES enter the selected menu item or approval of an adjustable parameter in menu e NIE NO exit from the menu or go up one level in the menu 2 3 1 Menu options e bu threshold activation for audible signals LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 798 7 2 4 2 4 1 Pro calibration mode selecting this mode will input in calibration mode you cannot exit this mode by pressing the NIE NO button you have to turn off the meter nr no displays serial number of probe LB 798 Measurement of humidity and conductivity of the material Measurement of material moisture Material moisture measurement should be carried out as follows connect hygrometer LB 798 and LB reading panel 796 to the socket labeled C in Figure 1 attached to the socket with the screws included in the plug probe pour the material into a container to full
14. e meter for the service When x 2 you can try to hold the materiat button for about 10 seconds till the sign shows up and wait a few seconds after that If you still see the Er2 message you should be deliver the meter to the service When the message OFF shows up you should turn off and turn on the meter o message Er4 s indicates that there is not stored in the meter any material characteristic e message LAB EL Elektronika Laboratoryjna Laboratory Electronics 16 User manual hygrometer LB 798 17 Er5 means that there is not stored in the meter any characteristics of the material in the resistive method the message is related to the LB 796 panel message Er6 indicates a communication error between the LB 796 and LB 798 probe Generally this error occurs if you disconnect the probe and the panel LB 796 during measurements e message Ers means that the reset has not been properly carried out You should turn off the meter and try to reset again 2 10 Validation hygrometer readings e Validation of meter readings should be made in calibration mode so you should enter this mode see the Chapter Meter calibration for new materials The hygrometer if the container are dry and clean should indicate the parameter value 1 00 0 2 otherwise you should reset the probe After filled with water if possible use d
15. elivery of material samples The operating principle of hygrometer is based on the measurement of constant of dielectric material by a capacitive method The measured material should be poured to the container 350 ml capacity which belongs to the meter equipment The dielectric constant of a dry material such as sand is about 4 while the dielectric constant of water is 80 Wet sand has intermediate dielectric constant values on this basis the moisture is calculated In addition it is possible to estimate the conductivity of the material and to measure its temperature using the internal sensor is connected to the lower part of the container The hygrometer is not a stand alone device and the panel LB 796P or LB 796A is required to read the results of measurements The main characteristics set hygrometer LB 796P LB 798 are as follows e easy to read LCD display energy efficient measuring microprocessor e meter can be calibrated for any material supplied by the user to the lab the calibration parameters are stored in non volatile memory of the meter it is possible to store up to 50 types of materials you can get the meter calibration certificate for the type of material e temperature measurement with a sensor built in the meter for the range of 20 70 C it is also possible to measure temperature using the optional external sensor TL 2 796 DB9 which may be connected to the panel LB 796 battery powered measurement of the
16. if the device is connected to the same port as before you may skip this step in the window of the LB79x program the temperature display should show up it proves the correctness of communication processes When working with LB79x do not disconnect the LB 798 probe from the computer it may lead to the loss of materials characteristics which are recorded in the meter The meter can be disconnected from the computer after turning off the LB79x program the Panel menu select the submenu Charakterystyki Materia w Characteristics of Materials all the characteristics of the material will be read you should select a free characteristics record by a double clicking and fill the following fields of the characteristics record activate the characteristics record mark an appropriate box select the appropriate method of measurement capacitance activate or not temperature compensation it is recommended to activate the compensation especially when the water volume is more than 10 of the sample material enter a three characters material code the shown digits are 0 9 letters A B C D E F G H I L N O P R T U U Y V J a space when other letter is used the minus sign will be displayed unacceptable codes Er0 Er9 bat OFF ERL CAL The code will be displayed on the meter If possible the code should be associated with the type of material such as sand in Polish piasek PIA etc ten characters of ma
17. istilled water the hygrometer should indicate the sqrteps parameter value equal to 9 0 0 3 for water at 20 C 2 10 1 Resetting the probe to zero To reset the probe to zero e complete empty and dry the container e activate the temperature measurement mode with the T TH button above the button there is the inscription ZERO 2sek Then hold the button for about two seconds and after a few seconds a sign will show up on the display and the meter returns to the temperature measurement this means the end of reset to zero During the zeroing you may not touch the container internal electrode Resetting to zero should be carried out every few weeks after validation of the readings 2 11 Notes on use 1 In the case of longer periods of the device inactivity it is recommended to remove the battery from the LB 796 panel in order to avoid pouring out of the electrolyte 2 It is recommended to use good quality batteries alkaline lithium LAB EL Elektronika Laboratoryjna Laboratory Electronics 17 User manual hygrometer LB 798 18 3 You should not unplug the LB 796 panel during device operation Before the battery removal the keyboard should be switched off Do not allow water to splash on the LB 796 panel or dew to condensate on it Protect your hygrometer against exposure to strong sunlight which can lead to overheating of the device 6 The hygrometer does not require maintenance v 3 Measureme
18. lected material the symbol las shown on the screen will inform that the moisture measurement mode is on choose the right material by pressing the materiat or material material you will see its three character code a list of materials stored in the meter and the corresponding codes can be found in an additional annex to the manual Press the Pomiar POJ button again the character with the measurement of humidity will be displayed on the screen If the measurement result is blinking it means exceeding the measuring range when you press the Pomiar REZ resistance measurement button the conductivity of the material will be displayed in mS m miliSimens meter about the resistance measurement activity will inform you the symbol on the screen after pressing the T RH the temperature of the material will be displayed the activity mode is indicated by temperature symbol C Operation of the hygrometer 2 1 Switching on and off Before switching on the device must be connected to reading panel LB 796 and LB 798 probe socket labeled as C in Figure 1 Turning the panel on may be done with any button other than the wy off button which is for the switching off After you turn the display moisture meter on for a moment internal firmware version of panel LB 796 will display with a single letter version of the meter for example 22 and then the firmware version of the connected probe will be
19. nt Specifications This chapter presents the measurement specifications of the instrument for measuring temperature humidity and conductivity Measuring range of materials available in the meter is shown on the additional annex to this manual The hygrometer tends to show a mass humidity which is defined as follows TEA mass contained in the material 199 mass of the absolutely dry material If humidity is defined otherwise it is indicated in the additional annex to the manual kg kg mass moisture m3 m3 volume moisture It is possible to scale the meter to indicate the humidity defined in other method PERFORMANCE DATA FOR MATERIAL MOISTURE Measuring range depending on the type of material shown in the table with a list of materials Resolution of measurement 0 1 Uncertainty of measurement 3 of measured value PERFORMANCE DATA FOR MATERIAL CONDUCTIVITY Measuring range 0 100mS m Resolution of measurement 0 1 mS m Uncertainty of measurement 10 of measured value PERFORMANCE DATA FOR TEMPERATURE Measuring range 20 70 C Resolution of measurement 0 1 C Uncertainty of measurement 0 2 C POWER SUPPLY Battery 1 battery 9V type 6F22 Other When communicating with a computer the meter is powered by the computer 5 mA temperature measurement Power consumption 13 18 mA mA measurement of humidity and conductivity OPERATING TEMPERATURE RANGE Device Range LAB EL Elektronika Laboratoryjna Laborat
20. o the set connect the converter to the meter LB 798 on the other side of the computer USB port using the USB cable that is supplied with the converter set after connection of the LB 376c to the computer the operating system should detect and automatically install the appropriate drivers for the converter the correct operation of the LB 376c converter will be indicated by a red LED PWR on if for some reason the system does not recognize the correct converter LB 376c the proper driver should be installed manually The driver is located in the USB directory of LB79x software typically this is C Program Files LB79x USB To do this use the Windows Device Manager to find improperly installed the USB device and update the driver by indicating the position previously described the above described configuration of LB 376c converter should be done only once on the first use every the next connection of the converter to the same USB port should be automatically detected by the operating system without any messages from of the operating system e start the LB79x software and select o COM port number menu Settings serial port to which the meter will be connected to for the LB 376c converter the port will be named USB Serial Port LAB EL Elektronika Laboratoryjna Laboratory Electronics 12 User manual hygrometer LB 798 13 From o the LB79x program stores the original settings of the port and
21. old value by using the arrow keys 7 e after setting the appropriate threshold it should be confirmed by pressing YES button the approval will be signaled acoustically and you exit to the one level above e you exit the menu mode by using the NIE NO button LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 798 10 e You can check by hand approach to the probe electrode whether a beep is generated when the threshold is exceeded 2 7 Calibration of the meter for new materials In the case of measurement of humidity of materials which are not contained in the list of materials in an additional annex the interpretation of the result depends on the user The relations between the measurements are preserved i e if one sample of the material indicated reading is less than the result shown on the second sample of the same type of material the first sample is more dry than the other To properly calibrate the moisture meter to indicate the result of such a mass moisture you should provide material samples to the laboratory LAB EL or information on how to prepare the material in order to calibrate the meter for the new material Guidelines for the preparation of specimens are as follows e sample of the material should have a maximum expected moisture if you can not soak the material and the water content in the material due to manufacturing processes and should be enclosed in a sealed package
22. ory Electronics 18 User manual hygrometer LB 798 19 LB 798 0 50 C LB 376C 8 200 450 OTHER PARAMETERS LB 798 dimensions 125x80x140mm LB 376C dimensions 56x31x24mm density of LB 798 housing IP67 not applicable for probe plug density of housing LB 376c P30 Container material stainless steel Standard cable length 1 meter Container capacity 350ml LAB EL Elektronika Laboratoryjna Laboratory Electronics 19
23. ppropriate menu option see Menu Mode The menu item is named nr number may be used to LAB EL Elektronika Laboratoryjna Laboratory Electronics 15 User manual hygrometer LB 798 16 display the serial number Please confirm the menu selection with the TAK yes button then the serial number will be displayed The menu is left by using the NIE NO button 2 9 5 Signaling the automatic temperature compensation Automatic temperature compensation is indicated by a flashing sign C 2 9 6 Signaling the operation mode of LB 796 as a reading panel When LB 796 works as a reading panel there is flashing colon on the display Then all measurements which are displayed are related to the probe not to the LB 796 panel which also has its own measuring functions Their starting is similar to the LB 798 oer 2 9 7 Other messages e When you turn off the meter the following message displays briefly OFF which means that after a while the meter will switch off If it does not switch off you have to turn the device off by pressing the wy off button e After switching the capacitive method on the message appears after several seconds CAL which means the automatic zeroing of the probe you should not touch the electrode probe at that moment e Ifafter you turn on the meter or during its operation the meter displays the message Erx where x 0 1 2 3 or 7 it means that this is the time to deliver th
24. provided by the manufacturer together with the LB79x program on request The key is related to the type of device and its serial number The keys are stored in the directory KEYS of the LB79x program for example C Program Files LB79x KEYS If the user does not have an authorization key for his her LB79x meter the program only will operate in a demo mode you cannot make setting characteristics etc File with the appropriate key should be copied to the KEYS directory to read the key you should turn off and turn on the LB79x program When selecting in the window of LB79x program select Ustawienia Klucze Autoryzacyjne Settings Key Certificate Authority you can read the current key 2 7 5 Checking the meter readings for the new material After entering the characteristics to the memory of the meter it is recommended to perform test measurements The measurements should be performed in the measurement mode after you press materiat or material material to select an appropriate material code that has been assigned to the new material The measurement conditions should be identical as in the calibration process for example a similar manner filling container with material The effect of test display is the humidity table which is calculated by reference or humidity method measured with the LB 798 meter Standard Humidity Humidity LB 798 Table 2 Example table of the values obtained from the validation of the LB 7
25. seeseseessssseeeesesesssereresesssssereresssssseees 7 2 4 2 Conductivity measurement of the material eee ee eeeeceeeseceecesaeeeeeeeeeeeeees 8 2 4 3 A method for filling a container with material 0 0 ee eeeceeeseneeceesnneeeeeeeeeeeees 8 2 5 Measurement of the material temperature ccsssssseccssssccsssccescsssscsessceosesees 9 2 6 Audible signal level of Humidity csssssssscccssssccscsceesccscssesscceecsesssscscsesesesens 9 2 7 Calibration of the meter for new materials ccsscscecsscsssescssccseessscseeesssceees 10 2 7 1 Entering the calibration Mod irienner er e ae a O EE EREE E 10 2 7 2 Performance of calibration measurements sseessssssesesesessseseresesssssereressesseee 11 2 7 3 Processing of measurement results eeseeeseeeeesseessssresssrestsrretssrreesesresesreeesseee 11 2 7 4 Entering the characteristics of the material to the meter memory operation of the LB 79 XSW ale ccvees s faves ieossboveedolecdescoepdeetia a a r aa a E E Eaa S 12 2 7 5 Checking the meter readings for the new material 0 0 0 0 eee eeeeeeseeeeeceeneeeeees 14 2 8 Measurement of the dielectric constant of the material sssscccssssssssssseees 14 2 9 Displaying an additional information ccccsssscsccscscccscsscscssoecsscsssccssseceeees 15 2 9 1 Battery low voltage indication eee eececesenceeesssececeseneeceessaeeeseeaaeeeseeaeeeeees 15 2 9 2 Signaling excess of
26. ss to the battery The hygrometer set includes e LB 798 hygrometer LB 796P reading panel or LB 796A e communication cable LB 79xRS with power supply optional with the LB79x calibration software e the converter LB 376c optionally together with a calibration program LB79x LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 798 5 1 2 Performance of the measurement short description This chapter presents a short description of the material moisture measurement the conductivity of the material and the temperature of the material More details regarding operation of the meter is presented in the Chapter 2 you should be aware of them 2 To measure the moisture content one should perform the following activities connect hygrometer LB 798 and LB reading panel 796 to the socket labeled C in Figure 1 attached to the socket with the screws included in the plug probe pour the material into a container to full see chapter Method for filling a container with material wait for the stabilization of temperature if the material has a different temperature than the hygrometer press any button to turn the meter on except the wy off button wait for the appearance of the 798 inscription and press the Pomiar POJ moisture measurement button the display will show the CAL inscription which indicates auto zeroing of the meter and then the symbol of recently se
27. terial name enter the name of the material such as sand etc number of active points enter how many points are active in the characteristics 2 15 characteristic points enter calibration points the maximum number of points pairs is 15 the first and last point mark the end of the measuring range it will be indicated by flashing a result of the measurement using the wykres chart button you can see how the characteristics looks visually and whether the points are entered correctly calibration certificate number does not apply you can type any indication date of the characteristic creation date when the characteristic has been created the date of characteristic entering the date when the characteristic was written to the device temperature compensation coefficients if temperature compensation is activated you should enter the coefficients values d 1 a b c 0 description of the material 40 characters you can briefly describe the material LAB EL Elektronika Laboratoryjna Laboratory Electronics 13 User manual hygrometer LB 798 14 After entering the characteristics to the meter you should record characteristics on the disk with the eksportuj export command this way you can easily restore the recorded characteristic in case of system failure by using the importuj import command 2 7 4 1 Authorization keys For each copy of LB 798 there is assigned an authorization key
28. the range there is a clear saturation LAB EL Elektronika Laboratoryjna Laboratory Electronics 11 User manual hygrometer LB 798 12 fold of the line but during the extrapolation it should be taken into account that the range of the parameter is approximately e sqrteps 1 0 10 0 when parameter increases the humidity increases too In general extrapolation extending beyond the measured characteristics of humidity should be made so that the end of the measuring range for the characteristic values would be equal to the characteristic values for example for 100 humidity 2 7 4 Entering the characteristics of the material to the meter memory operation of the LB79x software Using the LB79x calibration software enter the characteristics of the material to the memory of the meter To do this perform the following steps while maintaining the specified order e install the LB79x software if it was not already installed o run the software installer located on the CD which is supplied with the device a and sequentially perform the installer instructions o if the installation program started automatically turn it off e LB 798 connection to the computer the LB79x software should be off o when the LB 79xRS communication cable is included to the set connect the cable to the LB 798 probe on the other side of the computer COM port turn on the power supply to the grid o when the LB 376c converter is included t
29. y low voltage is consists of two threshold e flashing sign 4 poor battery but it is possible to make the measurements it is a signal to buy a new battery e continuous illumination of the sign 4 and the inscription shown on the display bAt indicates that the battery should be replaced 2 9 2 Signaling excess of the measuring range Exceeding the measuring range bottom and top for both humidity and temperature is indicated by the flashing of the measurement result In special cases the flashing of the measurement result may indicate damage to the meter In the case of measuring conductivity there is not signaling the range it is only a short electrodes signal ERL 2 9 3 Signaling an electrodes short circuit If during the measurement of humidity or conductivity on the display alternately with the result of humidity shows the message Erb this means that the probe electrodes are shorted too high a conductivity of the material caused by salinity Then the measurement of humidity is significantly erroneous and its interpretation should be performed with caution Note This message may mean an erroneous reset of the meter especially when it is displayed and the container is empty so you should try to reset to zero the meter as instructed see the Chapter The sonde zeroing 2 9 4 Displaying the serial number Entering displaying the serial number is done by selecting the a

User`s manual of the LB -798 hygrometer - LAB-EL

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