Operating Instructions
Contents
1. No The following settings are possible Unit Factor for calculating gas concentration in ppm volume concentration parts per million mg m mass concentration per volume mg kWh mass concentration over output Undiluted Calculation of gas concentration using reference oxygen YES NO Formula for calculation 21 0 Eea rel meas 21 0 2meas Reference Oo input reference oxygen value Oprel Boiler temp input boiler temperature Air pressure barometric air pressure used in the dew point calculation see appendix Page 24 ecom JN Probe heating soot probe heating on off Fuel change the fuel type e g when measuring on combination systems Clock set set the internal clock Fuel type lt PC changes the fuel type menu in the instruments EEPROM by accessing PC data via the RS 232 port Times set the memory and output options for sending data to RAM card and Centronics port Data logger switch the data output and storing on or off 6 Servicing To ensure interruption free use of the ecom JN please take note of the following information for servicing and maintaining parts Filter The JN is equipped with filters to protect the tubing and sensors and these need to be checked regularly Fine dust filter on the gas cooler Unscrew the lid of the gas cooler and Fine dust filter check the particle filter It should be changed when the filter is dark grey to2. black in colour where the gas comes in smoke number approx 2 3 da ecom JN Page 25 Filter in the heated probe only applies to instruments with the heated sampling system Important Always remove the mains connection before opening the probe the heating requires 230 V Open the bayonet fitting on the probe and remove the filter if it is dark grey in colour The filter used is a 8 um boron silicate glass fibre material SO2 NOx filter In the tubing leading to the CO sensor on the rear of the instrument there is a chemical filter for filtering SO2 and NOx out of the flue gas The filter material is manganese 4 oxide granules and should be changed once it has turned grey colour change pink gt brown gt black gt grey gt white Sensors After switching on the sensors are calibrated with fresh air The instrument constantly checks the sensor status New sensors age due to the reagents being used up oxygen sensor or due to dirt or being exposed to concentrations above their standard rang toxic gas sensors The initial values for sensors in check mode are Oxygen sensor approx 18 000 mV Toxic gas sensor 0 mV 150 These values are relative values created by the programming The check mode lt CTRL gt for the toxic gas sensors should show a value lt 150 mV if not the calibration should be repeated If an error occurs during calibration and does not disappear after repeating the calibration several times the in
3. press ENTER On the JN select the function Send general data and press lt E gt Page 20 ecom JN Select and View Print The functions Select and View Print can be used for checking the measurement results and printing them out Select the data to be viewed by entering a search pattern e g the name of a distributor or a customer number or memory number If no data can be found check the search pattern to see if it is correct The complete data base is searched and data retrieved when at least 4 characters are in agreement with the search string Once the search is completed the data is displayed and can be confirmed or re selected View Print can be used to view the entire contents of the memory and print them out 4 2 Working with chip cards Only for instruments with chip card slot The ecom JN can read from and write to 512 byte chip cards These data carriers which look like telephone cards can store approx 500 characters of information A chip card can be used as a installation data card a measurement file or as a job card Service card data Meas values Record gt MC Report The cards memory is divided into two areas standard data measurements ecom JN Page 21 Standard data Standard data are data describing an installation Owner max 60 characters Customer number max 20 characters Burner manufacturer max 20 characters Burner type max 2
4. printer instead of thermal printer Peltier cooler instead of condensation trap Probe holder movable Undercase Extended sensor on request Keyboard functions Contrast Print Set menu Cursor ET contro lt PRINT gt lt SET gt BimSchV up basya Zoom Paper line CO meas menu lt ZOOM gt feed lt MODE gt lt ESC gt a BESDBDD Display Draft meas Control Cursor light lt DRAFT gt menu down lt CTRL gt CO sensor Soot meas Memory Enter on off lt SOOT gt lt m gt lt E gt ecom JN Page 5 Accessories ecom N Item nr 52162 without picture Undercase Data cable Item nr Item nr 52981 53532 full height without picture 53201 half height Adapter cable USB RS 232 NOx hose soot probe Item nr F cael 10177 3 5 m 30001188 5 m NOx hose probe without soot measurement Item nr _ 30002193 3 5 m 30002213 5 m Filtering plate solid combustibles Item nr 10137 ry Filtering case solid i f combustibles Item nr 55810 Gas washing bottle only with peltier cooler Item nr 5044043 T room stick Item nr 51446 Page 6 ecom JN 3 Flue gas measurement 3 1 Flue gas analysis After selecting the appropriate probe for the measurement this should be attached to the measurement point and the temperature sensor for the input air should be positioned Care should be taken to ensure that all tubing an
5. the soot measurement Press lt SET gt to switch the probe heating off as the previous settings are stored and would cause unnecessary drain on the power supply when using the batteries ecom JN Page 11 Manual soot measurement and entering the values If the soot measurement is carried out manually using a hand held soot pump to reduce the load on the sensors the results can be stored in the instruments memory The soot measurements are added to the printer report and to the data for the measurement Press lt SOOT gt and then lt MODEs gt Enter the smoke number decimal point using the arrow key and confirm with lt E gt Repeat twice more and then continue as described above The values are stored automatically 3 4 CO measurement flue gas check When testing the safety of a gas fired incinerator a flue gas path test often called a CO measurement is carried out The CO content of the flue gas is measured after the flow restriction and the undiluted value 0 oxygen remaining in the flue gas is calculated The flow of flue gas after the flow restriction is no longer homogenous due to secondary air flow and so the main stream measurement will contain errors The analysis of the gas therefore is carried out using a multi hole probe optional extra Align the holes of the multi hole probe against the flow direction in the gas stream Press the lt MODE gt key and the 4 values required for a CO measure ment are shown in the displ
6. visible in the display the temperature being measured is rising i e the probe is moving towards the centre of the main gas stream A sign means that the probe is being moved away from the gas stream centre and the temperature is dropping The display is deleted if no change occurs for 3 seconds or more 2 Correct measurements appear in the display after a short delay due to the time taken for the gas to reach the sensors and the time taken for the electrochemical sensors to reach a stable signal between 1 and 1 5 minutes Measurements should not be saved noted or ac cepted until the values are stabilised If the values still vary by more than 2 ppm this could be due to an unstable draft behaviour in the flue gas which gives rise to a variable gas stream centre This can be confirmed by checking the draft value in the display If this value varies strongly or is considerably higher than 0 20 hPa this can effect the measurement 3 The values for CO Eta Losses Exc air and Dew point are calculated They can only be calculated correctly when realistic values for O2 and temperature are available Care must be taken to ensure that Oo lt 20 5 and T gas T air gt 5 C The dewpoint can only be calculated accurately if the current barometric pressure was entered under lt SET gt If the gas temperature falls below the dewpoint between 25 and 65 C ETA will be calculated with condensation In the display C appears behind E
7. 0 characters Year of manufacture max 10 characters Fuel type max 20 characters Hu kWh m3 max 6 characters Jet size max 9 characters Jet pressure max 6 characters Boiler manufacturer max 20 characters Boiler type max Characters Year of manufacture max Characters Nominal performance kW max 11 characters Set performance kW max 6 characters This data is either on the card if it has been prepared previously or it can be entered directly into the ecom JN using the keyboard if the chip card is to be prepared during servicing or installing The standard data required is fixed as the length of the data areas If a chip card is inserted into the ecom JN the data is read from the card into the instruments RAM Measurements The measurement results contain all measurement informations If a chip card has been inserted into the ecom JN and the lt m gt key is pressed the results are transferred from the instrument s RAM to the chip card Any data already on the chip card is over replaced Page 22 ecom JN Store gt MC If the chip card is used as an installation card it generally remains with the heating installation with the data stored on it The data can be transferred to a RAM card and then to a data processing system for general processing or report generation This is done by selecting Store gt MC with the cursor MC means memory card and storing the data on the un res
8. ECO Creative technology made by rbr Operating Instructions ECOM e JN Index 1 Introduction 2 Equipment 3 Flue gas measurement 3 1 Flue gas analysis 3 2 Draft measurement 3 3 Soot measurement 3 4 CO measurement flue gas check 3 5 Storing and printing results 3 6 NOx measurement NOx standard 4 Data processing 4 1 Data base RAM 4 2 Working with chip cards 5 Instrument settings 6 Servicing 7 Technical data Page 2 Page 24 25 27 ecom JN 1 Introduction The ecom JN is a combination measurement instrument for analysing flue gases and other combustion process parameters The flue gas analysis is carried out using electrochemical fuel cells Flue gas temperature input air temperature differential pressure soot number and any values calculated from these values such as flue gas losses efficiency and the excess air complete the list of results available and form the necessary parameters for the classification of small heating installation according to the 1st BImSchV The ecom JN is the result of the many years of experience which many users have had with the ecom J and J Plus series and combines the highest possible safety requirements with user friendly operation and technology using the best most modern circuitry in a future oriented design The following instructions describe the simple operation of the instrument in the first shorter section This section should be read to avoid mistake
9. TA Once the measurements are stable and reliable press lt m gt to store the values in the memory They can be stored here for printing out at a later stage ecom JN Page 9 3 2 Draft measurement The draft present in the flue gas channel has already been indicated by the trend display earlier The chimney draft value is not stored by pressing lt m gt as the differential pressure sensor is very sensitive and drifts For this reason it is recommended to re calibrat the sensor immediately before a measurement to ensure a good accuracy Adifferential pressure measurement is started by pressing lt DRAFT gt The current value is displayed as well as a reminder to reset zero point Remove the draft tubing and press the lt MODE gt key The sen sor will now be re calibrated Draft measurement Draft 0 05hPa Reset zero point release draft hose then press lt MODE gt Fix the tubing The display now shows the exact value which can saved value 0 08 hPa be stored by pressing lt m gt This value will be added to those already stored The value saved is displayed To leave the draft measurement press lt ESC gt Page 10 ecom JN 3 3 Soot measurement A soot measurement is started by pressing lt SOOT gt A soot measure ment at oil fired systems consists of three suction phases in which a volume of 1 63 0 07 litres is drawn in The colour greyness of the soot filter paper is graded according t
10. actors ppm mg m3 mg kWh Gas ppm to mg m3 mg m3to ppm fuel type co NOx so2 02 1 429 0 699 Nat gasL 1 092 1 795 co 1 25 0 8 Nat gasH 1 073 1 762 NO 1 34 0 75 Propan 1 05 1 722 NO2 2 05 0 49 Town gas 1 002 1 647 SO2 2 86 0 35 Oil EL 1 105 1 816 2 587 Oil S 1 12 1 847 2 63 Dew point calculation The dew point calculation uses the approximation given in DIN 4705 part 1 100 M fth u in 9 oisture content ofthe gas mo F 11 in 1 WwW CO fw is a fuel factor gas 57 town gas 53 liquid gas 77 oil 111 Partial pressure of steam calculation Kmo P in Pa D air 100 Pair atmospheric air pressure 900 1100 mbar 4077 9 Dew point calculation T 236 67 ins 23 6448 In P ecom JN Page 29 Gas cooler illustration Gas Gas in out gt Peltier TE element Sep SS warm Level eae indikatar ERS Ventila tor Condensation _ removal Gas at a temperature above the steam condensation point 35 65 C passes through a long surface treated metal spiral with good heat conducting properties The gas losses its heat to the metal A direct current driven peltier element semi conductor cooling element is thermal connected to the metal spiral and to another spiral with ventilation and cooling fins The current flowing through the peltier element causes a heat transfer from warm to cold thus removing the warmth from the gas flow
11. ay The value shown after CO U is the calculated CO content assuming the oxygen content is 0 the undi luted CO concentration in the flue gas 02 17 5 7 CO U 738 ppm co 123 ppm Exc air 1 03 Once the display is stable press the lt m gt key to store the value Press lt MODES gt to return to the standard flue gas measurement mode Page 12 ecom JN 3 5 Storing and printing results The rbr ecom JN has a 58 mm thermal printer for printing reports optional matrix printer The printed report can be used as a copy of the work carried out for the customer or as an archive copy of the measurements A report is printed by pressing lt PRINT gt and contains only those values stored in the memory at that time A described earlier the individual measurements are stored by pressing lt m gt the soot measurement is stored automatically Once lt PRINT gt has been pressed the stored values can be checked The report is printed by selecting Start print and is structured as follows Customers name and address form the data JN base only appears if the relevant options on have been selected or installed name 1 text 2 lines each 20 characters long name 2 comments notes information linet line 2 Date Time date and time of report 12 0994 12 34 56 CO measurement result from flue check 02 17 5 CO U 738 ppm co 123 ppm Lambo 1 15 flue gas analysis results according BI
12. d connections between the probe and the instrument are correct If a mains supply 230 V 50 Hz is available nearby mains cable is 5 m long it should be used The instrument can be powered by the rechargeable batteries when using a heated sampling system mains supply must be used If needed a tube should be connected to the air input and an external air supply A container for condensate should be placed near the condensation pump outlet which is on the lower right hand side of the instrument case Switch on the instrument Gas analysis Data bank RAM Service card fl select lt E gt confirm Depending on the instrument version either a menu appears on the display or if there is no data processing software present the 3 minute calibration phase starts immediately To carry out a flue gas analysis select Flue gas measurement with the cursor and confirm by pressing lt E gt The last selected fuel type will now appear in the display The fuel type can be selected using the arrow keys to change the display to the fuel required and is selected by pressing lt E gt l select lt E gt confirm Fuel type CO2max Calibration phase 2 59 min Natural gas Naturalgas 11 8 Town gas 11 7 CO2max 11 8 Al 0 37 B 0 009 Coke gas 10 2 Liquid gas 14 0 Oil 15 4 ecom JN Page 7 If the optional data processing package has been installed the user is asked for using the data base function If YES is selec
13. e instructions given in the programme on the PC The data transfer must also be confirmed on the JN before transferring The reserved area on the card is formatted differently in a few seconds progress is shown on the display The JN is then ready to accept data from the PC The functions Select and View Print are now available The office work with the JN is now finished and the JN can now be used for actual measurements The decisions whether to use a data base and which storage medium to use are made after switching on the instrument The settings for storing general data on RAM cards are found under Set menu lt SET gt function times and data logger YES Send data bank Connect the JN and the PC via their RS 232 ports and start the programme and follow the instructions Chose the function Send data bank on the JN and press lt E gt Clolinmum i eatin Load data bank Send data bank Send general data The data will be sent to the PC The data base on the RAM card contains information about changes made which means that only data corre sponding to actual measurements are transferred If there is general data in the reserved area on the RAM card which is to be transferred to the PC e g measurements from the data logger the RAM card data programme should be used Connect the PC and JN via the RS 232 port Start the programme on the PC Set the required options on the PC and
14. erneath the cooler and can be removed by pumping out either as required or automatically when the instrument is switched off ecom JN Page 15 The gas is in the tubing for such a short time and is unable to react or cool down any further on its way to the sensors so no further condensation occurs The nitrogen oxides are measured separately using two sensors Both values are displayed and dealt with separately Their sum is calculated according to the conditions set NOx in ppm NOX ppm NO ppm NO2 ppm NOx in mg m3 NOx in mg kWh Calculated from tables according to TA Luft and the fuel type The conversion factors for the individual gases are in the appendices Please note the following when measuring nitrogen oxides 1 Use the heated sampling system Measurement carried out using the normal sampling system without the gas cooler can have an error due to up to 40 of the NO2 concentration being washed out 2 The heated sampling system can only be used with a mains power supply The power consumption is approx 400 W 3 The set temperature is reached after approx 5 minutes and is then controlled by the programme 4 Be sure to connect the condensation tubing when using the heated sampling system and gas cooler to avoid problems due to condensation being pumped off Page 16 ecom JN 4 Data processing The ecom JN data processing package consists of RAM card slot Extended software External keyb
15. erved part of the RAM card general data Report In many cases it is necessary to store additional information along with the measurement information already available Up to now the data processing and handling using the ecom JN has been done without paper using the most modern techniques It is therefore only natural that any additional information is handled in the same way Select Report with the cursor a blank display screen appears which can accept up to 280 characters from the external keyboard 7 x 40 charakters of text can be entered Report Delete lt F2 gt There are no restraints on the text which can be entered and it is stored as written in the instrument s RAM The function Store gt MC transfers the text along with the chip cards contents to the RAM card Once the JN is switched off all of the data in its RAM is deleted only data stored on RAM cards or chip cards remains ecom JN Page 23 5 Instrument settings The ecom JN functions are described in the previous sections The calculated and measured values can be altered by changing certain options via the settings on the JN Pressing lt SET gt when in the flue gas measurement mode accesses the options menu Move the cursor to the relevant position and press lt E gt Ei p Sie S Livange ini ppm Fuel Undiluted Nein Clock set Refe 02 00 4 Fuel ty PC Boiler temp Times Air pres 1013 mbar Data logger No Probe heat
16. ing procedure deletes all of the data previously stored on the card and is irreversible Approx 1 kB is reserved on the card for system information RAM cards are formatted by choosing the option RAM card from the menu Select Visualize Print Communication RAM card A list of further options appears along with information on the RAM card Format Cancel files Configurate Capac it valle ele General Data 0 Reserved 250 kB Free 261 kB Select Format and after the warning message has been confirmed the RAM card is formatted Once the formatting is finished the main menu reappears Note The standard setting for RAM cards is 512 kB if RAM cards of different capacity are used this must be set under Configurate as otherwise the card will be incorrectly formatted The RAM cards can be used for storage and for data base functions With the data base function data is loaded from a PC e g installation data customer data and the measurements are added later in situ Once the measurements are completed the data can be transfered back to the PC in the correct form and under the correct area To do this an area of the RAM card must be reserved Page 18 ecom JN The rest of the card can be used for other measurement data which does not need to be stored under a specific installation e g when using the data logger function Select Configurate from the menu Two lines appear in
17. ing through the spiral and transfers it to the cooler This heat is then removed by the ventilator The condensation formed by the gas cooling is collected in a container below the cooler and periodically pumped off using a peristaltic pump triggered by the operator or by the level indicator The gas suction pump prevents the gas from remaining too long in the presence of condensation and so reduces any losses due to washing out reactions The gas temperature on leaving the cooler is approx 5 C with a relative humidity of approx 100 water vapour fraction lt 7 g kg Page 30 ecom JN Coaxial probe 1 Inner tube gas inner 6 mm outer 8 mm 2 Outer tube draft inner 9 mm outer 10 mm 3 Draft connection 4 Gas connection 5 Connection for T gas 6 Temperature sensor for T gas NiCr Ni 7 Slot for soot filter with pressure piston 8 Trigger for the piston ecom JN Page 31 Subject to technical changes V1 7 10 2007 rbr Messtechnik GmbH Am GroBen Teich 2 D 58640 Iserlohn S mmern Telefon 49 0 23 71 9 45 5 Telefax 49 0 23 71 4 03 05 Internet http www rbr de eMail info rbr de Page 32 ecom JN
18. limit over charge protection Power consumption max 100 W without heated sampling system and gas cooler approx 400 W with heated sampling system and gas cooler Optional extras heated sampling system Tmax 100 C length 3 5 m with heated probe and pre filter hot gas filter T gas max 200 C RAM card data carrier Standard 512 kB PCMCIA norm case for additional equipment Dimensions Case W x Lx H 450mm x 300mm x 250mm Weight approx 12 kg with standard probe 300 mm ecom JN Page 27 Measured values Parameter 02 CO NO Option NO2 Option SO2 Option CO Option Draft T Gas T Air Calculated values Parameter CO2 Losses Efficiency Excess air Fuel types Fuel Fuel oil Natural gas Town gas Coke gas Liquid gas Page 28 Range 21 Vol 4 000 ppm 2 000 ppm 200 ppm 2000 ppm w 10 Vol 20 hPa 500 C 99 C 050050 00 S Principle Electrochemistry Electrochemistry Electrochemistry Electrochemistry Electrochemistry Electrochemistry DMS bridge Thermocouple NiCr Ni Semi conductor Range Formula ea 0 Conax CO CO 21 0 99 9 s T Fy 2 s as ir qa 21 0 G A 0 99 9 Eff 100 q O 1 co 2 21 0 2 CO2max values and factors Al A2 0 50 0 68 0 37 0 66 0 35 0 63 0 29 0 60 0 42 0 63 B CO2max 0 007 15 4 0 009 11 8 0 011 11 7 0 011 10 2 0 008 14 0 ecom JN Conversion f
19. mSchV to BImSchV Fuel type Heating oil Tair 22 C T gas 140 C 02 13 2 NO NO3 NOx only shown if option installed CO 85 ppm NO 43 ppm NO2 5 ppm Differential pressure measurement NOx 48 ppm Draft 0 05 hPa soot measurement results Smoke no 1 2 1 3 1 4 Oil derivative No 8 lines of text max 20 characters which can max 8 lines of 20 be programmed according to the customers characters requirements either before delivery or bya name shee telephon service check e g firm address eM ecom JN Page 13 Text input lines 1 and 2 In certain cases it can be useful to include additional comments in the report notes comments observations etc This can be achieved by selecting Text input with the cursor and pressing lt E gt Insert text Cancel with lt ESC gt delete with lt F2 gt Two lines each 20 characters in length are available for inputting any information required An external keyboard is available as part of the data processing package without this keyboard only numeric data can be entered using the internal keyboard Whilst the report is being collated and printed all other functions are inoperative Note The memory contents can be deleted by pressing lt m gt in the appropriate mode BImSchV measurement CO measurement or draft measurement The m in the display disappears and the values in the memory are deleted without being over written with by any current results To
20. o the 10 level Bacharach scale SOc MAA gs Ue Gm hm tc smoke no 1 smoke no 2 smoke no 3 an ee Oe a BEN oat oil trace Mean value All three individual measurements are recorded We recommend that the soot measurements are heated to avoid the filter paper becoming wet from the condensation which will effect the colour of the soot deposited The filter paper assembly in the probe is heated to 70 C Electric soot measurement with the ecom JN Switch on the heating for the sampling probe by pressing lt SET gt move the cursor to Probe heating NO and press lt E gt to change it to YES lt ESC gt leaves the menu Place a filter paper into the holder in the probe and press lt E gt to start the measurement The volume drawn is displayed and once 1 63 litres has been reached the greyness value must be entered To do this remove the filter paper from the holder and compare it with the colours on the scale If a greater accuracy is required a densitometer reflec tion photometer can be used which gives a value accurate to one decimal place Enter the result and confirm with lt E gt The cursor now moves to the second soot measurement Repeat this procedure until all three soot measurements have been completed The cursor has now moved to the oil derivative display lt E gt switches between YES NO and The average is calculated and automatically stored Pressing the lt ESC gt key ends
21. oard Centronics parallel port Optional RAM cards in different sizes standard 512 kB The extended software enables additional functions for storing and administrating measurement results as well as long term measurements with data logging Data processing consists of two different methods 1 Processing of individual measurements and installation data This data can be stored on an external data carrier for processing at a later stage The data is stored in a standard format compatible with PC data formats and existing software e g regional administration programmes data bases 2 Processing of long term measurement data with automatic recording data logger The instrument records all measurement data over a time period at programmable intervals or sends them via the serial and parallel ports to a PC or printer The preferred data carrier is again the RAM card if a PC is connected the data can be written directly to the hard disk The data processing functions other than those connected with recording measurement data can be used when the instrument is not measuring The pump and the sensors remain switched off and no calibration is carried out when the instrument is switched on ecom JN Page 17 4 1 Data base RAM The JN uses RAM cards as storage medium for large amounts of data RAM cards with capacities up to 4 MB 4096 kB can be used As a disks a RAM card must be formatted before it can be used The formatt
22. s and problems when using the instrument The servicing and maintenance information and the information on possible errors should also be read The second somewhat longer section describes the function of the processes used in the instrument and contains details on technical data The instruction manual is set out to cover all possible options and so includes the NOx and data processing modules Finally we would like to wish you every success in using the ecom JN in your every day work ecom JN Page 3 2 Equipment Probes Pistol grip probe standard suitable for combined gas flue gas losses draft measurement and soot measurement Depth 290 mm Diameter 10 mm Coaxial form with Thermocouple NiCr Ni T GaSmax 500 C Triple chamber tubing 3 m long Heated soot measurement point Positioning cone Multi hole probe option CO measurement of gas burners 3 meter tubing Heated sampling system option Heated tubing 100 C 3 5 m long Heated probe 100 C with 300 mm probe tubing and integrated NiCr Ni thermoelement T Gasmax 200 C Hot gas filter Sensors T room sensor standard Room temperature sensor with positioning magnet T rooMmax 99 C Page 4 ecom JN Standard fittings Soot number comparison scale Replacement filter Case carrying strap Operating instructions Data sheet Optional extras RAM cards standard 512 kB Additional keyboard Matrix
23. store the current values the lt m gt key must be pressed again and the m appears in the top right hand corner of the display again Page 14 ecom JN 3 6 NOx measurement NOx standard The ecom JN can be equipped with a complete NOx module which comprises NO sensor NO sensor Peltier cooled gas heat exchanger Heated sampling system 3 5 m long The instrument can also be equipped with only one sensor for measuring the NO concentration although no NOx calculation can be made in this case NOx is made up of the sum of the NO and NO concentrations in the flue gas which depend on the fuel and the combustion process Legal limits and recommendation always refer to the sum of nitrogen oxides NOx Under normal conditions NO is very reactive and will be washed out by condensation to form nitric acid HNO3 For this reason the gas path from the measurement point to the instrument must be kept condensation free to avoid washing out of NOs The heated sampling system heats the head of the probe and the tubing to a temperature standard 100 C above the water condensation point this is normally between 45 and 60 C and so prevents condensation forming The peltier cooled gas heat exchanger shock cools the gas down to a temperature of between 5 and 8 C This causes excess water and water vapour which can no longer be kept in the gas at this temperature to condense out The condensation is collected in a container und
24. strument should be sent in for servicing The oxygen sensor should read gt 7000 mV If this is not the case it should be exchanged Probe and tubing The tubing and the probe should be cleaned regularly depending on use to remove dirt and to avoid wear due to corrosion taking place The coaxial probe can be dismantled by unscrewing the outer tube The inner tube is connected to the grip The thermocouple is perma nently attached to the grip The tubing can be cleaned after removing it from the connections on the instrument and probe use warm water and allow to dry or blow dry Page 26 ecom JN Power supply A rechargeable battery is used for mains free operation The battery has a capacity of 3 4 Ah and the autonomy use depends on the operating mode approx 1 hour with gas cooler and internal heating with heated soot measurements The battery is recharged by plugging the instrument to the power supply charge time approx 10 hours Switching on is not necessary The battery should be recharged once the voltage display reads less than 11 V the critical point is 10 5 V after this the instrument will not function The battery voltage is only displayed when the instrument is not using the mains supply 7 Technikal data General data Power supply mains 220 240 V 50 Hz battery 12 V 3 4 Ah lead gel Battery operation gt 1 hour with full load low charge protection 10 5 V Charge time approx 8 10 hours charging current
25. ted the data field type can be selected See chapter Data processing for detailed informations Once the 1 minute calibration phase is completed the instrument is ready for measuring The gas path inside the instrument is switched from fresh air to GAS and after a pause of approx 20 seconds the time for gas to reach the sensor the complete measurement display appears The display can differ depending on the sensors included in the instrument rbr ecom JN 1009794 Tag sys 02 17 35 Exe air t15 CO2 10 1 T gas 140 Ie co 145 pom T air 24 C NO 38 ppm Draft 0 05 hPa Eta Qo 5 Dew p AG Oe Losses 7 3 Instruments with the NOx module have a separate display for NO NO2 and NOx The lt ZOOMs key can double the display size i e after pressing once the display changes from 8 lines to 4 lines 02 17 57 co2 10 1 amp co 145 ppm Losses 1 3 The arrow keys can be used to alter the last two lines in the enlarged display in this case CO and Losses The upper lines can be changed by pressing the lt ZOOM gt key again switching to a two line display 2 17 5 ca 10 1 The last setting chosen remains so that the important values can be set in the display Page 8 ecom JN Please note 1 The measurement must be carried out in the gas stream centre The gas stream centre is where T gas is at a maximum which can easily be found using the trend display As long as a sign is
26. the display Total 512 kB Reserved 256 kB Total determines the total capacity of the RAM card If this is different from 512 kB press lt E gt to set the correct capacity The values shown are those for acceptable RAM cards The reserved area is set similarly by moving the cursor to Reserved and pressing lt E gt until the desired value is reached The reserved value is increased in steps of 64 kB Once the settings are correct press lt ESC gt to leave this menu Cancel files does not need much explaining After the warning has been answered with YES all files on the card are deleted Warning Due to the read write mechanism used with RAM cards accidentally deleted files cannot be recovered The delete and format functions should therefore only be used after the data on the card has been copied onto a PC Communication Once the RAM card has be prepared it can be used The option Communication accesses the functions load data base send data base and general data transfer The options are selected with the cursor and lt E gt Load data bank Data is transferred from the PC via the RS 232 port from a particular programme e g the regional administration software To do this the RS 232 port on the ecom JN is connected to the serial port on the PC Croimim un iela thionn gt Load data bank Send data bank Send general data ecom JN Page 19 Data is transmitted according to th
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