USER MANUAL LA-NIR1700 - SK Latronics Laser GmbH
Contents
1. Latronics GmbH H ttenstra e 7 D 52068 Aachen GERMANY USER MANUAL LA NIR1700 Table of Contents IIWOGUCUON 2er Mielke 3 Unpacking and Inspeelan ne er 3 TechnicalDaB esse sirios 4 Safety rule Soen O een el 5 Installation and Starting OperatiONS ooococcccccccnccncncnccnnnnnccnnncnnnnnnnnncnnnnncnnnancoos 5 Operation rrna a a a A 5 Maintenance anr eee E E O oa 12 Wastedisposal anisan nee ie es 14 System COMPONEN Sci A 14 INTRODUCTION This manual contains all information you need to install operate maintain and service your near infrared absorption spectrometer The manufacturer reserves the right to change the operation instruction or the devices herein in the course of technical progress Caution Don t try to repair any part of the spectrometer by yourself while the unit is still under warranty but report all problems to Latronics GmbH for warranty repair UNPACKING AND INSPECTION When you receive your spectrometer please immediately inspect the shipping container If there is any damage holes or crushing etc insist that a representative of your local carrier is present while you unpack the contents Carefully inspect your spectrometer as you unpack it If any damage is evident such as dents or scratches on the cover etc immediately notify your carrier and your local sales distributor For a better handling of the spectrometer in service matter keep the shipping containers for sending2. otherwise it s not possible start with measurements It s not necessary to wait until the warm up period ca 15 min recommended is finished The initialization can be performed immediately after switching on the device If the initialization is successfully performed this is indicated by a little green square below the display and also confirmed by Initialization successful written into the orange Message box on top Signal as T OD E By these radio buttons the kind of measurement is chosen Transmission measures the wavelength dependent light transmission of a sample in Transmission I sample reference sample and reference are the intensities of the light behind the sample and reference respectively Optical density is the logarithmic value of the absorbance of a sample Optical density LOG I reference sample LOG 1 Transmission Energy is simply the DC signal of the voltage with lowest level of amplification This DC voltage is given to the AD converter and it is in a range from 0 lt 5000 mV This function is useful for testing and service purposes Goto Wavelength The wavelength has to be written into the Textbox After clicking onto the Go button the monchromator drives to the chosen wavelength The Measure button enables measurements of transmission optical density or energy at the chosen wavelength When the chosen wavelength is reached this is
3. 3 C Energy 0 4000 mv E Goto wavelength nm Gen fu r Time Scan 7 Choose number of points Choose dwell time in seconds rim sen Wavelength Scan Start wavelength Stop wavelength Chose step 3 Pazo in rite y Chose dwell See tees waver Pl sion Rd Control buttons Control buttons Khaki coloured display and message information boxes on top The big khaki coloured field displays the spectrum of a wavelength scan or time scan in real time The orange field above is a message and information box that indicates the status of the device and displays also error messages or gives advices if wrong values are chosen by the operator for instance a wavelength out of the wavelength range The white boxes y_max and y_min at left hand side of the orange message box indicate the maximal and minimal value of a wavelength scan at the corresponding wavelengths If a time scan was performed they indicate the minimal and maximal values at the corresponding times The white boxes beside x and y indicated the values of the cursor The cursor is the mouse The cursor function can be activated or deactivated by the menu Data Cursor OFF ON Control buttons below of the screen The little red or green squares on left hand side below the khaki display beside Initialization Goto Wav
4. horizontal workbench The back of the instrument should be at least 15cm away from the wall to ensure effective ventilation Avoid a place where mechanical vibrations occur e lt is recommended to keep the device away from an environment generating strong magnetic or electric fields or emitting high frequency electromagnetic waves e The spectrometer shouldn t be installed in an environment with corrosive gases e Ensure that the ambient temperature is in a range of 10 35 C and humidity is kept below 85 Operation After turning on the power it is recommended to wait 15 minutes before starting a measurement in order to ensure thermal equilibration of the tungsten lamp However the initialization can be performed immediately after switching on the spectrometer Software The device is completely software controlled via an USB interface This software doesn t claims to be sophisticated software for data manipulation and evaluation but main purpose is the recording of wavelength and time dependent spectra Besides recording measurements it contains some basic tools for data evaluation like smoothing of curves and mathematical operations When starting the software the following screen appears Cursor values Message and Information box EE LATRONICS GmbH LA NIR1700 Software lex File Data ymax ff el Y y_min C y Initialization za Signal as TIODIE Transmission 0 100 Optical Density 0
5. out of the specification or if the light emission becomes to low it should be considered to change the lamp The power of the light emission can be checked when checking the energy at the wavelength of ca 1340 nm At this wavelength the energy should be gt 3 000 mV If it s significantly lower the spectrometer would still work properly assumed that the stability of the light emission is sufficient but the required gain will be higher leading to a slightly lower performance of the signal to noise ratio of a spectrum In fact the stability of the light emission is the more important issue concerning the suitability of the lamp The schematic diagram of the tungsten lamp assembly is shown in the figure below Change of the tungsten lamp works a follows e Switch off the power supply of the instrument Pull out its plug e Remove the four screws located at both sides of the outer cover of the instrument afterwards remove the cover e Unscrew the screws 1 fixing the two legs of the lamp then pull out the tungsten lamp upwards e Wipe out a new lamp with alcohol and dry it for a minute e Plug in the new lamp and tighten the screws 1 Avoid to touch the new lamp directly by hand It s recommended to touch it by clean handkerchief If the lamps legs are too long they should be shortened e Switch on the instrument to light the tungsten lamp e Move the filter wheel in front of the entrance slit of the monochromator by hand unt
6. Corrected manipulated data La ETE g v 70 al Is A iin B Wavelength 720 1 SR E ES M ma in nal Signal EN E sad Aa 5 NE ramas ron La E ocinent muros Wsesensto doe Merose D ZABA ws sala SH E causan va Bj omer mensa E screenshot dos meros S 28B 208 mu File Open Opens a file and displays it on the screen The file has to be in ASCII format and has to consist of three columns with data of wavelength or time Raw data corrected data File Save Saves data of a scan These files are in ASCII format and consist of three columns with data of wavelength or time Raw data corrected data If there are no corrected data this column is set to zero File Save Screenshot Saves a picture of the screen in png format File Exit Finishes the program If there are still data not being saved this is indicated by a message box and the operator has to confirm to leave the program without saving the data Data Arithmetic plus minus multiply divide Performs the respective operation with the actual data set The new data set is displayed and stored to an array If there are further operations these operations always hold for this new data set which is changed by the new operation The array of the original raw data remains always stored to a separate array This
7. also indicated by the little control button that switches from red to green colour Time Scan Measures the time dependences of transmission optical density or energy versus time The number of data points and the dwell time can be chosen from the Combo boxes If the number of data points is gt 800 not all data points are displayed on the screen which can display 800 data points as a maximum Of course all data points are stored The dwell time is the time between the data points The total duration of a time scan is displayed in the orange Text box on top of the screen If transmission or optical density are measured the respective values of a reference sample at begin of a time scan have to be measured This reference sample can also be the sample itself Wavelength Scan Measures a spectrum in the wavelength range from Start wavelength to Stop wavelength Minimal start wavelength is 900 nm and maximal stop wavelength is 1730 nm Step size of a wavelength scan and the dwell time have to be chosen from the Combo boxes The dwell time is the time of data collection i e integration time at a fixed wavelength point during the scan There is additional time for instance of renewal of the graphic screen The dwell time during the reference scan is longer as additionally the gain is optimized during the reference scan Step size of the wavelength scan is slightly lower than indicated by the values 0 3 1 3 10 nm This depend
8. back the instrument to Latronics GmbH Anyway if you find a damage claim you may need them to demonstrate that the damage occurred as a result of shipping Please check the following components 1 Spectrometer 2 Cables for power supply and USB connection 3 CD with software 4 Set of 5 mm 10 mm 20 mm and 30 mm cells 5 Tungsten lamp TECHNICAL DATA NIR absorption spectroscopy is widely used for qualitative and quantitative analyses in areas such as metallurgy geology machine manufacturing petrochemical industry commodity inspection medicine environmental monitoring food inspection agricultural chemistry and teaching in colleges and universities etc Characteristic features e Single beam wavelength scanning in a wavelength range of 900 1730 nm e Spectral resolution 3 nm 2 nm on request e Full Software controlled operation under Windows 98SE 2000 XP Vista e Customization of operating software on request e Synchronization with external devices by I O signals e Wide sample compartment for long path length cells of up to 10cm e Various kinds of sample holder can be integrated e Dynamic range of absorbance A 0 2 Specifications 900 1730 nm wavelength range Light Source Tungsten lamp Detector InGaAs photodiode Wavelength range 900 nm 1730 nm Wavelength accuracy 0 5 nm Wavelength reproducibility lt 0 3 nm Spectral ba
9. elength and Scan Collect Data are control buttons and indicate the status of the respective processes see below The red or green squares on right hand side of the display indicate the status of 3 O ports 0 5 VDC that enable the synchronization of the spectrometer with external devices Digital In and Sync out These options can be implemented into the software according to the requirements of the customer Analogue out indicates that an analogue output voltage 0 5 VDC 10 bit resolution is given to an external device This option can be implemented into the software as well Digital I O levels and analogue output can be given to BNC connectors at the backside of the device These options are not activated in the standard software If you need a synchronization or communication with external devices please discuss your requirements Like this we can adapt software according to your needs The grey fields display the actual wavelength and the signal of a time scan or wavelength scan in real time Input fields and green buttons on left hand side Parameter and the start of a measurement are set by the input fields and the green buttons at the left hand side The green buttons perform the initialization and start a measurement time scan wavelength scan and measurement at fixed wavelength can be performed Initialization After switching on the spectrometer the initialization has to be performed first
10. ensures that the raw data of the original measurement are always maintained Smooth Adjacent Average 3 5 Raw Data Corrected manipulated data Smoothes data by calculating the average value of a data point and the adjacent two adjacent average 3 or four adjacent average 5 data points The data point is replaced by the average value of the 3 or 5 data points This can be applied to raw data and to corrected manipulated data as well If corrected manipulated data are smoothed they are overwritten by this new data set If raw data are smoothed and there is already a corrected manipulated data set this data set is overwritten by the new data set The raw data are always maintained Differentiation 1st derivative raw data Corrected manipulated data Calculates the first derivative of the raw data or a data set that has been already corrected or manipulated If corrected manipulated data are differentiated they are overwritten by this new data set If raw data are differentiated and there is already a corrected manipulated data set this data set is overwritten by the new data set The raw data are always maintained Differentiation 4th derivative raw data Corrected manipulated data Calculates the fourth derivative of the raw data or a data set that has been already corrected or manipulated If corrected manipulated data are differentiated they are overwritten by this new data set If raw data are differentiated and th
11. ere is already a corrected manipulated data set this data set is overwritten by the new data set The raw data are always maintained Scales Linear Logarithmic Calculates the linear or logarithmic y log x values of a data set If a linear data set is displayed in logarithmic form it can be get back by choosing the linear display of this data set or vice versa Raw data only Displays the original raw data on the screen without any additional data set of corrected manipulated values Grid ON OFF Switches the grid on and off Cursor ON OFF Switches the cursor on and off The cursor is the mouse and the values of x wavelength or time and y optical density transmission or energy are displayed in the white boxes on top of the screen Maintenance and trouble shooting The instrument will be guaranteed for one year from the date of arrival It s not possible to generate a mistake in operation by using the software If the user should choose parameters that doesn t fit or are out of range of the instrument this is indicated by the orange message box and the spectrometer wouldn t start However if the function of the spectrometer should be not normal it s recommended to perform a new initialization If this doesn t help the spectrometer should be switched off and on after some seconds It s also recommended to unplug and plug the USB cable connection and to restart the software Afterwards a new initialization has t
12. il the white light passes onto the entrance slit Adjust the tungsten lamp up and down or left and right in order to achieve a light spot on the slit as shown below in the sketch Don t touch the lamp directly by hand as it s extremely hot e After the position of the light spot has been well adjusted well switch off the power supply of the instrument then recover the outer cover of the instrument After the replacement switch on the instrument and start an initialization If no error occurs the replacement is completed Schematic diagram of lamp and light spot on the entrance slit of the monochromator Waste disposal This product doesn t is to be disposed in normal garbage waste If this spectrometer is no longer employed and should be disposed please refer to the service address indicated in the scope of delivery System components Spare parts and services identification of the manufacturer Latronics GmbH H ttenstrasse 7 D 52068 Aachen GERMANY Email latronicsgmbh aol com Phone 49 0 241 8882 120 Fax 49 0 241 8882 121
13. ndwidth 3 nm others on request Minimal wavelength increment 0 3 nm Minimal sampling interval kinetics 0 5 s other minimal time on request Range of absorbance A 0 2 Photometric accuracy 0 5 T T transmission Photometric reproducibility lt 0 3 T Baseline flatness A 0 01 Drift lt 0 004 A h O 1350 nm after warm up Noise lt 0 4 T peak to peak 01350 nm duration of measurement 3 min Ambient temperature 10 35 C Humidity lt 85 Power supply 220 10 VAC 50 Hz lt 50 W Dimensions weight 487x388x185mm lt 20 kg Control Windows software 98SE 2000 XP or Vista Pentium3 processor or higher recommended Special features Communication with further devices by I O signals or RS232 on request Adaptation of control software according to customers needs SAFETY RULES The spectrometer has to be operated in accordance with the operating instructions Improper operation and handling can endanger the safety of persons and lead to damage to the device The electrical safety of the power supply units in particular against contact with voltage and current carrying has to be guaranteed Basically ensure that all plug connections are securely fixed Installation The instrument should be installed in an environment that fulfils the following requirements e Avoid a place that is exposed to direct sunlight or high temperature changes e The instrument should be placed on a stable
14. o be performed If the error message Connection to Spectrometer lost is displayed in the orange message box please check whether the instrument is switched on and the power switch is illuminated If this is o k the connection cable for the USB ports should be disconnected and connected again after some seconds Then an operation like Goto wavelength Time scan or wavelength scan should be performed If the spectrometer shouldn start the process and the orange control box steadily indicates Connection to Spectrometer lost the USB connection cable should be checked or the spectrometer should be switched off and on again after some seconds It s also recommended to restart the software Afterwards a new initialization has to be made If the procedures described above don t help or often occur please report the problems to Latronics GmbH Don t try to repair the device by yourself while the unit is still under warranty Also if the device is no longer under warranty it s strongly recommended to contact Latronics GmbH for problem solving and or repair Replacement of the tungsten lamp Tungsten lamps are articles of consumption and have a certain lifetime If the operating time has exceeded the normal operating period the light emission stability will deteriorate Stability of the lamp can easily be checked by running a time scan by measuring the transmission over time When the stability of the light emission is
15. s on the lines per mm of the grating When choosing 0 3 nm the exact step size is 0 2896 nm and concerning 1 nm 3 nm and 10 nm it is 0 8688 nm 2 896 nm and 8 688 nm respectively The grey control field beside Wavelength displays the actual wavelength rounded to 0 1 nm Of course the data are stored with the exact wavelength values During a scan the signal corresponding to the wavelength is indicated in the grey control field at the bottom On measurements of transmission or optical density a reference sample has to be measured before measurement of the sample A measurement is started by the green button Start Scan If for further measurements the scan parameters wavelength range dwell time step size stay the same it can be chosen whether a new measurement of a reference sample shall be performed This holds also if just the dwell time is changed for a new measurement When performing further operations time scans for instance measurements at fixed wavelength between wavelength scans it is recommended to record a new reference scan even if the scan parameters of the wavelength scan stayed the same This holds also if there are longer time periods between wavelength scans During a scan the little control button indicates by green colour when the signal is collected by the detector The menus File and Data ESE gt fo ej x a gt fosa Bam y r dst derivative Ath derivative Raw data
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