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ELTRA ON-900 Operation Manual
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ELTRA ON-900 Operation Manual

Oxygen/nitrogen determinator
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ELTRA GmbH
Retsch-Allee 1-5
42781 Haan Germany
www.eltra.org

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Summary of Contents for ELTRA ON-900

  • Page 1 ELTRA GmbH Retsch-Allee 1-5 42781 Haan Germany www.eltra.org...
  • Page 2 4.1 Measuring principle 4.2 Gas flow system 4.3 Infrared cell 4.4 Thermoconductivity cell 5 MISCELLANEOUS 5.1 Ordering numbers 5.2 Packing 5.3 Trouble shooting 5.4 ON-900 Pre-installation guide Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 0.2-1...
  • Page 3 Under no conditions should the device be placed in direct sunlight ! Avoid places exposed to the wind of air conditioners or to the wind blowing through open windows or doors. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 1.1-1...
  • Page 4 Catalyst furnace Sample drop Mains switch Crucible pedestal Carrier gas pre-cleaning Pneumatic lift O - trap Upper furnace part IR-cell purge pre-cleaning Lower furnace part Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 1.2-1...
  • Page 5 First connect the analyser to the mains power and switch it on. The switch, located on the fore side of the analyser, is to be set to position 1. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 1.3-1...
  • Page 6 The computer is already provided with an operating system and software for controlling the analyser. NOTE: For all instructions on operating the PC software refer to the Help-function of the software. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 1.4-1...
  • Page 7 The flow rate is stabilised after several seconds to 15 l/h and can be read from the lower flow indicator. At the same time the cooling water pump starts. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 1.5-1...
  • Page 8 1.6 Cooling water The ELTRA ON-900 has two cooling water circulation systems, a primary and a secondary system. The primary system provides furnace cooling, and consists of:  The external barrel.  The internal section of the analyser, which includes water pump, equalising tank and furnace.
  • Page 9 Water pump Furnace Tap water temperature solenoid valve sensor Tap water inlet Water temperature sensor Secondary water cooling tank Tap water drain Tap water coil Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 1.6-2...
  • Page 10  If the rotation is erratic, then there is still some air in the cooling system.  Switch the mains switch back to pos. 1, reopen the air bleeder and add some more water into the equalising tank. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 1.7-2...
  • Page 11 Bleeder Water flow wheel Water flow 32480 Graphit crucible Pump inlet+dose Graphite tip Remove this serew to get access to the shaft 01-06 Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 1.7-3...
  • Page 12 The furnace should be open only as long as absolutely necessary. If the furnace is unnecessarily opened to long, you waste purging gas and additionally the electrodes may oxidise from the air. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 1.8-1...
  • Page 13 2 ANALYSIS 2.1 Working procedure The ELTRA ON-900 analyser is designed for the analysis of metals. Should other materials be analysed, take care that the furnace and the gas flow are not contaminated by dust or other combustion products. The analysis procedure is described in the following section.
  • Page 14 After closing the furnace the analysis is continued. Please, refer to chapter for instructions about the settings for making analyses of different materials. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 2.1-2...
  • Page 15 The furnace only remains open when the analyser is completely switched off. The mains switch is only set to zero for safety reasons, the crucible lift is then at the bottom Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 2.2-1...
  • Page 16 Once the analysis has delivered precise results, the signals from the oxygen analyser has to be divided. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 2.3-1...
  • Page 17 A typical pre-selection for furnace power ramp- function, is from 1.0 kW to 5.0 kW in 200s. The oxygen profile of the tested material is shown in figure 1 Figure 1 Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 2.3-2...
  • Page 18 At the end of this analysis we obtain the total oxygen result. This should be in an acceptable range, or else the temperature program needs to be modified. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 2.3-3...
  • Page 19 Only this way, it is possible to analyse each oxygen phase. We have to calculate all the peaks out of our “mountains” of signals. Figure 4 Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 2.3-4...
  • Page 20 “fingerprint” of the material. It is very useful to compare the fingerprints of different materials to control or check a production process. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 2.3-1...
  • Page 21 Integration delay: Analysis power / time: 2,8 kW for 30s Min. analysis time: Accelerator / Flux: 1g Sn Calibration: Standard copper. Furnace cleaning after each analysis Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 2.4-1...
  • Page 22 Min. analysis time: Accelerator / Flux: (250mg) sample placed in a 1g nickel basket Calibration: Standard titanium 100 ppm. N / 1000 ppm O. High crucibles required. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 2.4-2...
  • Page 23 3,0 kW for 60s Min. analysis time: 100s Accelerator / Flux: None Calibration: Pure chemicals in similar range. 10 – 100mg sample weight depending on oxygen concentration. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 2.4-3...
  • Page 24 2.5 Gas conservation Saving carrier gas: When the ON-900 is in analysis mode, but it has nor been used for a while, the gas consumption will automatically be reduced to a very low level. This low flow keeps the gas flow system flooded with carrier gas, preventing the air from penetrating the system.
  • Page 25  Replace the copper oxide in the catalyst furnace, take the electrodes from the furnace chamber out to clean them with a brush. Remark: The above is related to steel analyses and helium 99.995% pure. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.1-1...
  • Page 26 With catalyst furnaces, the copper oxide is replaced after about 3000 analyses. See . It is safer, but not absolutely essential, to switch the analyser off. The components are refitted in reverse order. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.2-1...
  • Page 27 The quartz tube (1) is pulled put diagonally downwards The furnace (2), together with the grid (3) is removed. The components are refitted in reverse order. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.2-2...
  • Page 28 This will be easier to assemble or disassemble and further it improves the sealing. Make sure that the O-rings are completely sealed around the glass tubes. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.3-1...
  • Page 29 The chemical containers must be closed very tightly, immediately after use, so that they do not become contaminated with air moisture or CO Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.3-2...
  • Page 30 This simplifies the fitting and particularly the removal of the tube, and ensures proper sealing. Make sure that the O-rings are completely sealed around the glass tubes. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.3-3...
  • Page 31 Each filling quantity carries a tolerance of ± 20 % Quartz wool 90330 Copper oxide on rare soils 90289 Anhydrone 90200 Sodium hydroxide 90210 Glass wool 90331 Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.3-4...
  • Page 32 Each filling quantity carries a tolerance of ± 20 % Quartz wool 90330 Copper turnings 90245 21120 6-2-3 Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.3-5...
  • Page 33 O - rin g V OL T C RA F T O - rin g O - rin g 0 5 - 5 - 1 Fig.1 Fig. 2 Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.4-1...
  • Page 34 The dust trap is the glass tube, filled with quartz wool. If this quartz wool is dirty it must be replaced, see U0T2T 0T2TU U0T2T Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.5-1...
  • Page 35  Clean the lower electrode with the small brush (5) or a soft cloth.  Put the sample drop back into the furnace  Shut the furnace Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.6-1...
  • Page 36 (1), and then the graphite tip (3).  Reassemble the new graphite tip and both the electrodes in the reverse order. Secure the screws holding the electrodes well. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.7-1...
  • Page 37 (9), and finally replace the graphite tip (10).  Reassemble in reverse order. Secure the screws (8) well. 6 - 6 Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 3.7-2...
  • Page 38 The pump sucks the gas through the catalyst furnace. There it is converted from CO to CO . After that the CO is detected in the IR-cell. The nitrogen is detected by a thermal-conductivity-cell. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 4.1-1...
  • Page 39 4.2 Gas flow system Gas flow diagram: Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 4.2-1...
  • Page 40 The infrared analyser is thermostatically controlled, so that the sample gas which flows through it is brought to a constant temperature. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 4.3-1...
  • Page 41 (6). The base line is automatically set to zero, so that no adjustment is necessary. The thermo stabilisation takes care, that the surrounding has no influence on the cell. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 4.4-1...
  • Page 42 Pressure gauge 77411 Panel meter 5A 78015 Mains power switch 72010 70230 b a r 72010 70210 b a r 78015 70230 20000 70210 8-1-ON Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.1-1...
  • Page 43 Chopper blade holder 05065 Chopper motor 05048 Infrared source ( emitter ) 70280 O - ring 70330 O - ring 75120 Spring 75130 Retaining washer 75190 Washer Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.1-2...
  • Page 44 Cable 06421 Infrared power supply assembly 06670 IRT zero adjustment board 06748 Infrared electronic board IR41(2channels) 06749 Infrared electronic board IR41(1channel) 15205 Gas flow sensor Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.1-3...
  • Page 45 Upper furnace part 60234 Pneumatic valve 31246 Combustion chamber 77033 Circuit breaker 32A 31325 Sample drop mechanism 77051 Thyristor block 31331 Abdeckung Wasserkühlung 77140 HF-filter 250 V Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.1-4...
  • Page 46 IR/TC cell 11390 Gas valve 12044 Transformer 15037 Voltage stabiliser board NR32/IR version 15266 Gas pump 15268 Pump control board PC1 18467 Microcontroller board UNI Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.1-5...
  • Page 47 72102 Screw 90191 Graphite crucible 70430 70435 31325 72101 70410 70415 31331 71010 70425 31246 31250 90190 31360 72102 31365 70405 31380 31220 31393 06-5 Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.1-6...
  • Page 48 Upper bride 31466 Eccentric wheel 31480 Support for motor bracket 33120 Tube for dust trap 77423 Temperature sensor 77460 Micro switch 78054 Motor for sample drop Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.1-7...
  • Page 49 The analyser and furnace should be wrapped in plastic foil, especially when you use chips or any other kind of material in small pieces. The glass tubes must be empty. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.2-1...
  • Page 50 Tilt the analyser to the other side and place the second piece of foam at the right place. If necessary, a third piece of foam can be placed on to the pallet. foam 08-2 Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.2-2...
  • Page 51 There must be a gap between the upper furnace and the plastic disc of the lower furnace. If there is no gap, change the lower electrode. If this is not the problem, change the upper electrode. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.3-1...
  • Page 52 Make sure that the temperature is less than 70°C. Test the secondary cooling system. If the temperature is not above 70°C, an electric fault is the problem, call a service engineer. Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.3-2...
  • Page 53  Use tap water for cooling, with at least 4 bar (60 psi) pressure. Connector for water supply: outer diameter = R¾". (The tubes supplied together with the analyser, carry a connector with G¾" inner diameter). Copyright  2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.4-1...
  • Page 54 Copyright © 2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900 5.4-5...