User manual hygrometer LB -797 - LAB-EL
Contents
1. S300 Accept the changes by pressing Zako cz Finish In the Konfiguracja serwera ustawienia podstawowe Server Configuration basic settings you should see two devices the LB 375 and LB 797 Konfiguracja serwera ustawienia podstawowe Es Urz dzenia w serwerze Edytuj Miejece dofaczenia LAB EL LB 3 5 USB LAB EL LB 9 LB 375 wej cie 5300 Press the OK button to confirm the addition of these devices The LBX program should establish communication with the devices in seconds they are shown in the left LBX window or in the Urz dzenia Devices menu To view the current measurements run the menu Urz dzenia LB 797 Dane Devices LB 797 gt Data The window displays as on the figure below For more information about LBX and its capabilities view the help for LBX Pomoc Help menu T LAB EL LBX f Efx Plik konfiguracja widok Okno Pomoc Panel GF otw rz e Zapisz Se Drukuj 3 Opcje oj Serwer Urz dzenia T Info LB 797 na USB O x fat andrzej PAE Ekrany u ytkownika Numer seryjny 1000 HENI x Temperatura 26 46 C Frzenikaho M Przewodnose 36 8 mS m Wiilgothioge Ok H amp Potaczenie OF Figure 8 Sample LBX program window after connecting the LB 797 sensor LAB EL Elektronika Laboratoryjna Laboratory Electronics 25 User manual hygrometer LB 797 26 5 Measurement Spe2. The greater the number of measurement points the better the later accuracy The 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 1 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 1 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 LAB EL Elektronika Laboratoryjna Laboratory Electronics 13 User manual hygrometer LB 797 14 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 reject or if the data points are more than 15 You may cal
3. for the panel LB 796P Other When communicating with a computer the meter is powered by the computer 8 mA temperature measurement Power consumption 17 22 mA measurement of humidity and conductivity OPERATING TEMPERATURE RANGE device range LB 797 0 60 C LB 376c 20 50 C DIMENSIONS LB 797A without electrodes diameter 40mm length 240mm LB 797C without electrodes diameter 40mm length 160mm LB 376C 56x31x24mm electrodes diameter of 3 mm and a length of 60mm 25mm distance drill diameter of 65mm and a length of 1 meter pipe for the probe inserting 40mm diameter meter density of LB 797 housing IP68 not applicable for probe plug density of housing LB 376c P30 OTHER PARAMETERS Electrode material stainless steel 1H18N9 Standard cable length 1 meter LB 797A 3 5 meters LB 797C Maximum cable length 10 meters to communicate with LB 796 2km for the S300 interface 50 meters for a voltage output Life in the soil about 10 years LAB EL Elektronika Laboratoryjna Laboratory Electronics 27
4. 797 and reading panel LB 796 to the socket labeled as C on Figure 1 attach it to the socket with the screws included in the probe plug press any button to turn the meter on except the wy off button wait for the appearance of the 797 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 selected material the symbol ALS shown on the screen will inform that the moisture measurement mode is on choose the right material by pressing the materiat or materiat material or material the a three character code will be displayed The list of materials and the corresponding codes are stored in the meter memory they can be found in an additional annex to the manual Press the Pomiar POJ moisture measurement button again the character with the measurement of humidity will be displayed on the screen put the meter electrodes in the measured material and read the measured result of humidity electrodes should be completely immersed in the measured material for the probe LB 797A for the probe LB 797C the entire probe should be submerged in the material The electrodes should not be driven into the hard materials it can lead to the damage of the probe If the measurement result is blinking it means exceeding the measuring range when you press the Pomiar REZ resistance measurement butt
5. Electronics User manual hygrometer LB 797 6 LABEL LB 796 CE M e 124 T materiat Eea NIE l i l Wilgotno ciomierz materia w material hygrometer materiat pomiar 7 pi Trs Sonda pojemno ciowa capaticance probe Sonda rezystancyjna resistance probe T RH materia material ZERO 2 sek wy off pomiar measurement TAK OK NIE ESC NO Figure 1 Panel LB 796P view from the keyboard From the bottom there is an access to the battery The hygrometer set includes hygrometer LB 797 reading panel LB 796P or LB 796A optional converter LB 375 an option together with the program LBX converter LB 376C optional with the program LB79x communication cable LB 79XRS with power supply as an option together with the LB79x calibration program drill to the soil optional e pipe for guiding the probe LB 797C in a hole in the ground optional LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 797 7 1 2 Start of a 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 the operation of the meter is presented in the Chapter 2 you should be aware of them To measure the moisture content one should perform the following activities 2 connect hygrometer LB
6. The LBX program has many additional features about which learn after the assistance starting The LBX program displays four parameters red from the LB 797 e moisture content in the material calculated on the basis of characteristics number 1 e temperature of the material e the dielectric constant of the material e conductivity of the material When the measurement of any parameter is incorrect its field will be highlighted in ed Common Voltage output Table 3 Table Numbering and function of the wires in the DB9M plug of LB 797C probe LAB EL Elektronika Laboratoryjna Laboratory Electronics 22 User manual hygrometer LB 797 23 If you use only the S300 cables or voltage output without DB9M plug the cables must be insulated Computer Program LBX Green S300 LB 797C nical Black Screen Screen black should be connected to the ground if the device is used outdoors Figure 6 Connection of the LB 797C probe to PC via LB 375 4 1 Description of the LB 375 converter The following figure shows the LB 375 converter Figure 7 LB 375 converter NOTE It is recommended that you install LBX before the first connection of the LB 375 converter to your computer The LB 375 converter provides galvanic isolation between the probe LB 797C and USB computer interface circuits The converter LB 375 is equipped with two LED indicators e PWR red LED when this LED lights up it indicates
7. in menu LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 797 9 2 3 1 NIE NO exit from the menu or go up one level in the menu Menu options bu threshold activation for audible signals 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 797 2 4 Measurement of humidity and conductivity of the material 2 4 1 Measurement of material moisture Material moisture measurement should be carried out as follows connect hygrometer LB 797 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 after turning the hygrometer display when the 797 inscription shows press Pomiar POJ button Display will briefly read for 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 ALS informs that an activity of humidity measurement mode is on by pressing the Materiat button or materiat 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 Pomi
8. supplied by the user to the lab the calibration parameters are stored in non volatile memory of the meter it 1s possible to store up to 50 types of materials e temperature sensor with built in meter in the range of 20 70 C it is also possible temperature measurement using the optional external sensor TL 2 796 DB9Y which is connected to the panel LB 796 e battery powered LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 797 5 measuring the dielectric constant of the material ability to measure the conductivity of the material sound signaling of humidity level after crossing preset humidity threshold hygrometer switch off automatically after 3 minutes of inactivity signaling of the measuring range crossing remembering of the last selected material short circuit signaling of the meter electrodes this way we obtain an unambiguous measurement of humidity low battery indication auto zero function when you turn on the meter it is possible to reset the 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 A 3 5 digit LCD display B keyboard C multifunction socket for connecting o hygrometer LB 797 o external thermometer TL 2 796 DB9 o LB 797A Place in material the electrodes only LAB EL Elektronika Laboratoryjna Laboratory
9. 97C probe to PC via S300 interface description of the LBX program The LB 797C probe is equipped with an interface of S300 digital current loop which allows measurements transmission over long distances This interface except the data transmission is also used for power supply to the probe It uses for that the two wire line the polarity of attaching the interface cable is arbitrary the maximum length of the interface wire is 2 km It is a one way interface for data read only There are no options for device configuring by this interface Before placing the probe in the material such as soil it should be configured save the appropriate characteristics of the material Humidity read via S300 is calculated on the base of the characteristics with the number 1 Via the S300 probe can be connected to a superior system of data collection such as e LB 473 8 channel hub with Modbus RTU interface EIA 232 or EIA 485 e LB 489 4 channel data acquisition with the Ethertnet interface e LB 489 8 channel data acquisition with the Ethertnet interface e LB 741 meteorological station The S300 USB LB 375 converter is applied for the direct connection of the sensor to the computer The computer program can read measurements with LBX program Install this program from the supplied media updates are available on the http www label pl po lbx_program html run the program setup and follow the instructions of the installer
10. LAB EL Laboratory Electronics SJ ul Herbaciana 9 05 816 Reguty tel 022 7536130 fax 022 7536135 email info label pl internet site http www label pl www label com ol User manual hygrometer LB 797 Version 1 6 October 2012 from the firmware version 3RO LB79x program version 1 05 Continuous development of our products causes sometimes need to make changes that are not described in this manual User manual hygrometer LB 797 CONTENTS DESCRIPTION HYGROMETER ccccesccsecenscenecnsecnseeeesensecnseenseons 1 1 Elements of the hygrometer seecseecseosseeccecsseesccecsecsseescecssossseessocssesscecseosse 1 2 Start of a measurement short description secssecsseeseecssecsseossocssesseecseosoe OPERATION OF THE HYGROMETER ccesecssceneeenscenecenseceesenes 21 WICC MINS on and Oea cases uccwasouesacsseeuenuscued te seasecaases 2 2 Description OF THE keyboard sseeseecssosscecseocssesseecsecsseesceocsecsscossecssesssecssosso Zed Meni MO de sriid a ee a E ea ZO MenO OP UOS iraa a A ecm ees ak eee 2 4 Measurement of humidity and conductivity of the material 000 2 4 1 Measurement of material MOIStUTE 2 0 0 0 anii iir E ERa 2 4 2 Conductivity measurement of the material osenssenssensserssessseesserssees 2 4 3 The method for placing the electrodes in the material cceceeeeeeees 2 5 Temperature measurement of the ma
11. a proper converter connection to PC proper installation of drivers e TX RX green LED blinking LED indicates the correct sensor communication with the computer Using the USB cable included in the converter set connect the LB 375 converter to your computer marks on the converter housing Windows system should report and recognize the new USB LB 375 device only at the first time after you connect LAB EL Elektronika Laboratoryjna Laboratory Electronics ZS User manual hygrometer LB 797 24 The red PWR LED should light up on the converter LB 375 The S300 LB 797C sensor should be connected to the converter on the side of inscription If for some reason the system does not recognize correctly the LB 375 converter dimmed red light after connection to a computer you have to manually install the driver before that you may try to restart your computer The driver is located in the LBX for example C Program Files LAB EL LBX drivers usb_1b375_1b487 To do this use the Windows Device Manager to find improperly installed the USB device and update the driver by indicating the previously described directory as the location from which you wish to download a new driver Note Regardless of the number of owned converters the driver installation is performed only once and it should not be repeated for each of your converter 4 2 Configuring the LBX program After you install the LBX program on your computer you need to properly s
12. ar POJ button again the character will show on the display with some humidity measurement result lower measurement range put the meter electrodes in the measured material see the chapter How to place electrodes in the material and read the result of humidity measurement electrodes should be completely immersed in the measured material for the LB 797A probe a for the LB 797C probe the entire probe should be submerged in the material the electrodes should not be hammered hard into materials it can lead to irreparable damage of the probe the probe should also be protected against falling which can cause breakage of electrodes 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 LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 797 10 2 4 2 it indicates a short circuit of the electrode probe too high conductivity of the material caused by salinity you should be aware that in this situation the measurement result 1s erroneous during the measurement of the moisture flashes C this means that the active temperature compensation for material moisture is on it is possible to set the moisture threshold from which the system beeps see chapter Sound signal of the moisture level Conductivity measurement of the material Conductivity measurement of the material should b
13. cifications This chapter presents the metrological parameters 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 water mass contained in the material w 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 0 1 measurement 1 for moisture density in a dedicated calibration uncertainty of AT ET T measurement l 3 of the value measured for mass moisture PERFORMANCE DATA FOR MATERIAL CONDUCTIVITY Measuring range 0 200mS m Resolution of 0 1 mS m measurement Uncertainty of 10 of measured value measurement PERFORMANCE DATA FOR TEMPERATURE Measuring range 20 70 C Resolution of 0 1 C measurement Uncertainty of eG measurement LAB EL Elektronika Laboratoryjna Laboratory Electronics 26 User manual hygrometer LB 797 PA 6 Technical specifications OUTPUT VOLTAGE Range 0 10V Maximum load of the output 20 kohm voltage POWER Battery 6F22 9V battery
14. culate 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 the range the a clear saturation fold of the line but during the extrapolation it should be taken into account that the range of the parameter is 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 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 797 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 797 probe on the other side of the computer COM port turn on power sup
15. e carried out as follows 2 4 3 connect hygrometer LB 797 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 after turning the hygrometer on when the display will show 797 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 put the meter electrodes in the measured material see the chapter How to place electrodes in the material and read the result of conductivity measurement electrodes should be completely immersed in the measured material for the LB 797A probe the electrodes should not be hammered hard into materials it can lead to irreparable damage of the probe the probe should also be protected against falling which can cause breakage of electrodes when the display shows alternately with the measurement of conductivity message like this this means that the probe electrodes short circuit too high a conductivity of the material caused by salinity conductivity of the material should not be confused with the conductivity of water in the material The method for placing the electrodes in the material The method of electrodes placing in the material has a decisive influence on the accuracy of the measurement of humidity and cond
16. ecially when the water volume is more than 10 of the sample material e 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 e ten characters of material name enter the name of the material such as sand etc e number of active points enter how many points are active in the characteristics 2 15 e 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 e calibration certificate number does not apply you can type any indication e date of the sheet creation date when the characteristic has been created e the date of characteristic entering the date when the characteristic was written to the device e temperature compensation coefficients if temperature compensation is activated you should enter the coefficients values d 1 a b c Q e description of the material 40 characters
17. erial results from manufacturing processes and it should be enclosed in a sealed package e in the case of materials that can be soaked in a sample should be in absolutely dry state also it should be sealed 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 In the following part of the manual there is described how to calibrate the LB 797 probe in order to adapt it to measure the humidity of new materials and the procedure for writing in the characteristics of the materials to the memory using the LB79x software 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 It is necessary therefore e run menu mode 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 flashing sion 2 e when the meter is in calibration mode press T RH to start temperature measurement LAB EL Elektronika Laboratoryjna Laboratory Electronics 12 User manual hygrometer LB 797 13 e exit the calibration mode is performed only b
18. et it up this is also possible at the stage of the installation All the features of LBX program are described in the Pomoc Help menu The configuration consists of adding two device to the LBX program server the LB 375 converter as an intermediary device and LB 797C probe Run the menu Serwer Konfiguracja Podstawowa Server Basic Setup The window Konfiguracja serwera ustawienia podstawowe Server Configuration Basic Settings will appear where you may select the Urz dzenia Devices tab Konfiguracja serwera ustawienia podstawowe Og lne Urz dzenia Wwyj cia alarmowe Archiwum Opcje Serwer U ytkownicy SP viene r apn Hazwa Hiejzce dotaczenia Press the button another window will appear where you may select the device from the drop down type list LB 375 enter a descriptive name for example the same as the name of the instrument As a point of attachment please select USB Accept the changes by pressing Zako cz Finish Once again press the button to add the LB 797 device for example enter a descriptive name which may be the same as the name of the LAB EL Elektronika Laboratoryjna Laboratory Electronics 24 User manual hygrometer LB 797 instrument This time select as a point of attachment Urzqdzenie z 25 serwera device from the server from the drop down list select the LB 375 as an input
19. gain 2 10 Validation hygrometer readings e Validate meter readings to be made in calibration mode so be sure to enter this mode see the Chapter Meter calibration for new materials The hygrometer if the electrodes are dry and clean should indicate the parameter value 1 00 0 2 otherwise you should reset the probe After immersion in 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 Clean and dry the probe electrodes the electrodes can not be placed in the material 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 probe electrodes 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 1t is recommended to remove the battery from the LB 796 panel in order to avoid pouring out of the electrolyte 2 Itis recommended to use good quality batteries alkaline lithium 3 You should not unplug the LB 796 panel during device operation Before the battery removal the keyboard should be switched off 4 Do n
20. h 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 CAL seconds which means the automatic zeroing of the probe you should not touch the electrode probe at that moment e If after 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 the 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 e message indicates that there is not stored in the meter any material characteristic Message 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 797 probe Generally this error occurs if you disconnect the probe and the panel LB 796 during measurements message Erg LAB EL Elektronika Laboratoryjna Laboratory Electronics 19 User manual hygrometer LB 797 20 means that the reset has not been properly carried out You should turn off the meter and try to reset a
21. ion 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 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 mode Button functions in the menu mode are marked in blue e MENU 2sek 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 1s 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
22. ith which the probe is equipped should be placed in the measured material 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 Moisture is measured four parameters of the soil e humidity e temperature e conductivity e dielectric constant The probe LB 797 is available in two versions e LB 797A with handle e LB 797C without handle designed to be buried in the soil The probe LB 797 is not a stand alone device and to read the results of measurements the reading panel LB 796 is required In addition the probe is equipped with the following interfaces e Interface S300 two wire transmission over long distances e Output voltage 0 10V e Modbus RTU EIA 232 or EIA 485 with 8 channel concentrator LB 473 e Fthertnet by 4 channel data acquisition LB 489 or 8 channel LB 487 The probe also works with a meteorological station LB 741 Read the measurement is also possible with a computer by using a S300 USB LB 375 converter and the LBX software Additional equipment e Drill to the soil e Tube for introducing the probe into the hole in the soil for LB 797C The main characteristics of hygrometer LB 796P LB 797 set are as follows e easy to read LCD display energy efficient measuring microprocessor e meter that can be calibrated for any material
23. m stores the original settings of the port and if the device is connected to the same port as before you may skip this step e 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 797 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 LB 9X TRYB SERWISOWY Licencja dla Andrzej Opechowski SEE L LE 79 mr 1000 Temperatura 24 12 C Figure 2 Sample window of the LB79X software after connecting the probe LB 797 Ho amp 5 S lt v 5 asn Figure 3 Figure LB 376c converter to be connected to the probe to the computer via the USB interface LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 797 16 From the Panel menu select the submenu Charakterystyki Materiatow 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 e activate the characteristics record mark an appropriate box e select the appropriate method of measurement capacitance e activate or not temperature compensation it is recommended to activate the compensation esp
24. midity in metal containers unless they are sufficiently large 2 5 Temperature measurement of the material The probe LB 797 has a built in thermistor temperature sensor which is located in the cap between the measuring electrodes You can also purchase TL 2 796 DB9 external temperature sensor connected to the LB 796 panel Temperature measurement of the material should be carried out as follows e connect hygrometer LB 797 and reading panel LB 796 to the socket labeled C in Figure 1 attach it to the socket with the screws included in the plug probe e after switching the hygrometer on when the 797 shows up press T TH the display will briefly read CAL indicating the auto zeroing of the capacitance probe do not touch at the time the probe electrode Then the symbol C and temperature measurement results display for example 23 4 e place the probe in the measured material wait for the temperature to stabilize and read the temperature result e If the measurement result is blinking it means exceeding the measuring range 2 6 Audible signal of the humidity level 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 This may be done in the following way e start the menu mode and select the bu menu option LAB EL Elektronika Laboratoryjna Laboratory Electronics 11 User manual hygrome
25. o 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 electrodes are not located in the material so you should try to reset to zero the meter as instructed 2 9 4 Displaying the serial number Entering displaying the serial number is done by selecting the appropriate menu option see Menu Mode The menu item is named nr number may be used to 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 moi 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 1s similar to the LB 797 2 9 7 Other messages e When you turn off the meter the following message displays briefly LAB EL Elektronika Laboratoryjna Laboratory Electronics 18 User manual hygrometer LB 797 19 OFF meaning that after a while the meter will switc
26. on 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 I TH button the temperature of the material will be displayed the active temperature mode will be indicated by temperature symbol C Operation of the hygrometer 2 1 Switching on and off Before switching on the device should be connected to the reading panel LB 796 and to the LB 797 probe to the 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 LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 797 8 CREA and then the firmware version of the connected probe will be for example 1 2 and after a moment the symbol of connected probe 191 While viewing these inscriptions an initial testing of the instrument is carried out 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 condit
27. ot allow water to splash on the LB 796 panel or dew to condensate on it 5 Protect your hygrometer against exposure to strong sunlight which can lead to overheating of the device 6 The hygrometer does not require maintenance 3 Output voltage 0 10V The LB 797 probe is equipped with a voltage output of 0 10V Before permanent placing the probe on the solid material such as soil the probe should be properly configured Save the appropriate characteristics of the material In the output mode the voltage corresponds to the humidity calculated on the basis of the characteristics of position 1 0 1V voltage corresponds to 1 relative humidity To start voltage output mode connect the gray wire RxD to the white wire GND Wiring diagram is shown in the figure below LAB EL Elektronika Laboratoryjna Laboratory Electronics 20 User manual hygrometer LB 797 21 Voltmeter LB 797C Black Screen Brown S300 Screen black should be connected to ground if the device is connected to the weather station eg in the open air Figure 4 Connection of the LB 797C probe in voltage output mode Voltage V O1 0 10 20 30 40 50 60 70 80 90 100 Humidity Figure 5 Output characteristics of the LB 797C probe in voltage output mode LAB EL Elektronika Laboratoryjna Laboratory Electronics 21 User manual hygrometer LB 797 22 4 Connect the LB 7
28. ply to the grid o when the LB 376C converter is included to the set connect the converter to the meter LB 797 on the other hand to 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 LAB EL Elektronika Laboratoryjna Laboratory Electronics 14 User manual hygrometer LB 797 15 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 o the LB79x progra
29. riat or materiat 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 of the probe electrodes location in the material The effect of test display is the humidity table which is calculated by reference or humidity method measured with the LB 797 meter Standard Humidity Humidity LB 797 Table 2 Example table of the values obtained from the validation of the LB 797 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 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 parameter measurement sqrteps square root of the dielectric con
30. sssccssscccsscccsscccsssccsssscessscesess ZF AO SMRESCUING the Probe 10 Ze Orari en a LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 797 Ze EA INOECS ON US snaien n i 3 OUTPUT VOLTAGE 0 10OV 2 ccc cccecececcncececscescececencecenensecesenesceeseeaeeees 4 CONNECT THE LB 797C PROBE TO PC VIA S300 INTERFACE DESCRIPTION OF THE LBX PROGRAM ccccceteeeeeeeeeeeeeeeeneees 4 1 Description of the LB 375 converter sccccsssccssscccsscccsscccsssscsssscessscesees 4 2 Configuring the LBX program ccsscccsscccsssccsssccsssccsssccsssscsssscesssceeess 5 MEASUREMENT SPECIFICATIONS cccceeeeeceeseeenesnseeeeesenees 6 TECHNICAL SPECIFICATIONS 0c cccccccceeceeeeeeeeeeeeeeeeeesseeeeseeeeeneees LAB EL Elektronika Laboratoryjna Laboratory Electronics User manual hygrometer LB 797 4 1 Description hygrometer LB 797 materials hygrometer is designed to measure soil moisture and other bulk 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 delivery of material samples The operating principle of hygrometer is based on the measurement of dielectric constant of material by a capacitive method Two needle electrode w
31. stant of the material we selec the appropriate 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 battery low voltage is two threshold e flashing sign A flashing sign poor battery but it is possible to make the measurements it is a signal to buy a new battery LAB EL Elektronika Laboratoryjna Laboratory Electronics 17 User manual hygrometer LB 797 18 e continuous illumination of the sign l4 and the inscription shown on the display bAt indicates that the battery should be replaced 2 9 2 Signalling 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 signal electrodes short circuit 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 this means that the probe electrodes short circuit to
32. ter LB 797 12 e confirm the setting with TAK YES button the display shows the currently set threshold humidity by which the sound signal is activated Now you can change the threshold 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 e by approaching the hand to the probe electrode you can check whether a beep is generated when the set threshold is exceed 2 7 Calibration of the meter for the new materials In the case of humidity measurement of materials which are not present on the list of materials for in the additional annex an interpretation of the result depends on the User The relations between the measurements are preserved i e when the indicated result on the first sample is smaller than the result indicated on the second sample then the first sample is more dry than the second sample To properly calibrate the moisture meter to indicate the result for example of the mass humidity one should supply the samples to the LAB EL laboratory or information about the material production methods to calibrate the meter for a new material Guidelines for the preparation of specimens are as follows e the material sample should have a maximum expected moisture if you cannot soak the material and the water content in the mat
33. terial ccccssccssscccsssccssssccssscoeees 2 6 Audible signal of the humidity level ssccssssccssscccsscccsssscsssscesssceeees 2 7 Calibration of the meter for the new mater talls cccccsssssccsssssccceeesees 2 1 1 Entering the calibration MOC sieves seceresxcsvnsdausidwwrisernci thnaenriatensareeieemasies 2 7 2 Performance of calibration MeasureMents cccecceseseceeeeeeeeeeeeeeeeaeees 2 7 3 Processing Of Measurement res ltS rinira a 2 7 4 Entering the characteristics of the material to the meter memory Operation OF the LLB 79X SOMW are aa a a 2 7 5 Checking the meter readings for the new material ccccceeeeeeeeee ees 2 8 Measurement of the dielectric constant of the material cccccseseses 2 9 Displaying an additional iInfOrmatiOn cccccccccccsscccssccsssccssssscsssscessscesees 29 1 Battery low Voltage 1Md1CaUlON ssiiccc gassed ei ehie EE E 2 9 2 Signalling excess of the measuring range ee cee cc eseecceeeeeeeeeeeeeeeeaeees 2 9 5 Signaling an electrodes SHOL CIPCUIl sivsvisd cation arden eae 29 4 Displaying the Serial NUMDEL 5220 2 cczdeuca a E a yeahs 2 9 5 Signaling the automatic temperature compensation ccecceeseeeeeee sees 2 9 6 Signaling the operation mode of LB 796 as a reading panel Zee MUNCH SSA ES e sia niadmaebanen aes emcpnanee 2 10 Validation hygrometer readings ssccccssccc
34. uctivity of the material First of all the electrodes should be placed entirely in the measured material for the LB 797A probe and for the LB 797C probe the entire probe should be submerged in the material There are two ways to place the electrodes in the material with manual compaction of the material without compaction LAB EL Elektronika Laboratoryjna Laboratory Electronics 10 User manual hygrometer LB 797 11 It is important that the material does not create air bubbles that cause a downward deviation of the measurement result Generally the electrode should be placed in the material initially compacted by hand unless the material is in the form of defined pellets and does not form air bubbles in this situation the electrode can be placed without initial compacting of the material Initial compaction of the material should be performed for the following materials sand soil coal dust copper sulphate Additional remarks which are aplicable during the measurement e during the humidity measurement conductivity one should select the sample of the material for the measurement to be hygro representative of the entire sample or it is necessary to perform several measurements and average them e after the measurement the probe should be washed especially the electrodes need to be cleaned e All metal parts located near the probe electrodes disturb the measurement result increasement especially one should not measure hu
35. y 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 parameter should be interpreted as the square root of the dielectric constant of material referred to as sqrteps the measurement should be made Keeping all the tips that are given for the measurement of moisture especially for placing the electrodes in the 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 797 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 1 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 Humidity o 0 23822 Table 1 Sample calibration table for the new material
36. you can briefly describe the material 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 using the importuj Gmport command 2 7 4 1 Authorization Keys For each copy of LB 797 there is assigned authorization key 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 your his her of the LB79x meter the program only will operate in a demo mode you can not make setting characteristics etc File LAB EL Elektronika Laboratoryjna Laboratory Electronics 16 User manual hygrometer LB 797 17 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 Mate
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