Presentation on theme: "Dumas Analytical System Laboratory Instruments Dumatherm."— Presentation transcript:
Dumas Analytical System Laboratory Instruments Dumatherm
DUMATHERM COMPETITION LECO Corp. St. Joseph, Michigan, USA Dr. Werner Küppers C. Gerhardt GmbH, Königswinter SALES TRAINING
TOPICS LECO competition Company profile and history Product range of LECO Truespec N as direct competition Principle Features and benefits Comparison with DUMATHERM Summary in table form
DUMATHERM – Keyfeatures We are the fastest We have less maintenance We have the easiest up- to-date technology Helium technology allows lowest nitrogen contents
Combustion technology easy and straightforward Combustion of samples with pure oxygen Reduction of all nitrogen oxides Easy separation of CO 2 and H 2 O Analysis of resulting gases with a thermal conductivity detector Combustion Reduction Connector tubing CO 2 Adsorbers Nafion tubing Detector
COMBUSTION PRINCIPLE C n H m N x + a O °C Must be separated ! Oxidation: n CO 2 + ½ m H 2 O + x N-Oxides Combustion of samples with pure oxygen (i.e. system must be purged to get rid of air) Remaining ash must be separated Reduction of all nitrogen oxides Separation of CO 2 and H 2 O Analysing of resulting gases with a thermal conductivity detector
COMPETITION DUMATHERM LECO Corp. Laboratory Equipment Corporation St. Joseph, Michigan, USA
LECO Truespec N Long history of combustion instruments since 1936 with an estimated market share of approximately 50% or more TruespecN is the end of a long history of models in the combustion field LECO is a specialist in carbon analysis with a focus on steel industry Food and feed instruments were added in the early 90s to complete the product range available since 2004
LECO Principle Combustion with high excess of oxygen Separation of dust with two filters Separation of water Collection of gases in ballast volume Aliquot of 2 ml is taken out and transported to the detector after passing some more scrubbers Brochure FP-2000
LECO Autosampler LECO Autosampler (silver) compared with our (black) plate Who can put more sample weight into his autosampler ?
How to put in1gram into a LECO ? LECO autosampler with a tin foil ball with 500 mg of milk powder Impossible to analyse !!!
Combustion Principle LECO C n H m N x ml O °C Oxidation with tremendous excess of oxygen: x N-Oxides Combustion is ALWAYS done with 4500 ml oxygen, not looking at the sample type (no difference between 5 mg EDTA or 1000 mg of animal feed) We use e.g. 100 ml oxygen for 100 mg EDTA which saves 4400 liter gas Handling oxygen lance: breaks often and has to be connected to the flange on top Ash insert is a porous ceramic crucible
LECO Combustion Tube / Old Type Tube is firmly fixed in the furnace and difficult to be taken out Furnace has to be almost cool for exchanging tubes While taking it out it is easily destroyed Material inside is just for filtering off the dust particles from the combustion LECO combustion
U-shaped tube cracks often and is difficult to mount and dismount More O-rings=more leaks Oxygen lance must be fixed very complicated at the lance holder and cracks very often during this operation (costs 350 Euro) Crucible: 210 Euro Trapping material is to absorb the dust during combustion LECO Combustion Tube / New
DUMATHERM: Combustion Tubes Easy to handle Exchange in hot status possible Only two o-rings for fixation and for sealing Oxygen dosing is done according to the sample weight (200 mg EDTA = 200 ml oxygen) 1:1 dosing results in less dust
Separation of Dust with LECO Combustion at lower temperature and with high excess of oxygen causes problems with dust Dust filters are needed Extra filter is mounted in the furnace The dust from the combustion is separated to a large amount Dust filter trap must be emptied and refilled by the customer (hazardous powders)
Ballast Volume and Aliquot Valve Ballast tank collects all combustion gases Aliquot valve takes out a loop of 2 ml from 4500 ml (0.04 %) and ONLY 2 ml are analysed with the detector This operation is needed, because these 4400 ml non-consumed oxygen would oxidise the copper for reduction completely during one analysis Ballast tank must be calibrated according to the surrounding air pressure. This calibration must be adjusted day by day Ballast control needs 9 additional valves Aliquot Valve with 2 ml loop
Ballast Volume LECO Gases should be filtered befor entering the ballast volume Effectivity of dust traps is very poor, because dust particles are always passing the traps into the ballast volume which makes frequently cleaning and volume calibration necessary More sample weight = more dust = MUCH more maintenance! Used and brand new ballast volume
Water Absorber LECOSORB No specialty, just sodium hydroxide on a little bit of silica support Hazardous consumable Customer has to refill the trap every week
Electronics and Structure Old fashioned and not up to date electronics with touch panel and keyboard at the instrument e.g. in the FP-2000 In general, electronic boards are not protected in a separated area Cables everywhere in this chaotic construction !!
DUMATHERM Electronics Clear structure One mainboard Easy to understand Electronics separated from the rest of the instrument …
Detector with LECO Old fashioned and not up to date detection technology based on the wheatstone resistance bridge principle Measuring gas flow and reference gas flow MUST be kept 100% constant Once again: chaotic construction
Detector Calibration LECO Data series for the calibration [in mg Aspartic acid or EDTA] : 1, 2, 3, 5, 7.5, 10, 15, 20, 25, 30, 50, 75, 100, 125, 150, 175, 200, 250, 300, 350 Daily Routine LECO: Two calibration standards are measured after the system has stabilized and the result is taken to shift the calibration upwards or downwards. System must be perfectly stable within this period. DUMATHERM: 5-8 points
SPEED: We are the fastest ! Based on the ballast volume principle, LECO has to fill the 4.5 litre ballast volume with every sample or blank value. This takes always the same time while we adjust the combustion time on the sample weight (i.e. less sample weight means less analysis time, e.g. 100 mg EDTA = 15 s No nitrogen analyser can do a nitrogen determination based on a reference method faster than DUMATHERM in about 3 minutes Duma is the Kisuaheli expression for cheetah, the worlwide fastest animal on land
Never ending list of O-rings of different sizes and materials Single parts expensive (service kits available) Often LECO service is needed for the change of those parts Service expensive 35 valves (we have only 10!) COSTS
O-Rings reference card with 26 different types DUMATHERM: just 4 different o-rings > 6 times less Maintenance to be done by customer Taken from the service manual for Truespec N
Spare Parts and Service DUMATHERM vs. Truespec No other instrument worldwide has less parts in the spare part catalogue than we have E.g. LECO has 26 different o-rings in the Truespec, DUMATHERM needs only 4! No other instrument worldwide has such a service friendly construction and such a clear structure Service with LECO can only be done by LECO specialists while DUMATHERM can be maintained by the customer No other instrument worldwide has less articles in the spare part catalogue LECO has a never ending list of spare parts No other instrument worldwide can be installed in the morning and gives good analytical results in the afternoon LECO needs a set-up-time of 2-3 days at least bevor starting the first EDTA…
Routine work on a LECO: If the combustion tube needs replacement you have to cool down the system and you need a full tool kit, which means that you are off for hours. Customer experience:Very few people have a comfortable experience with LECO these days. They used to be very close to their customers and form strong relationships, but the current ethos leaves people feeling somewhat cheated and facing high costs. Many users source their consumables and service from third parties because of high LECO prices … Disadvantages of LECO
Striking Arguments against LECO Compacter DUMATHERM design (65 kg against 130 kg) Clearer construction easy to understand allows well-founded customer training within one day. Analysis of all combustion gases and not only an aliquot is analysed after passing the ballast volume Maintenance free parts for water and carbon dioxide separation whereas LECO uses traps which must be emptied frequently Low service and maintenance costs due to well-thought construction Truespec must be kept ON to prevent long set-up-times after restarting the unit 20 times more oxygen consumption in every analysis, even with blanks Gas dilution causes massive problems with low nitrogen ranges (e.g. < 0.1% N)
LECO only sells instruments because of their historic position DUMATHERM is the better instrument, it is reliable, precise, easy to use and to maintain
Flowchart DUMATHERM Easy principle and only 10 valves!
DUMATHERM Combustion Easy access without further dismounting of parts No need to cool down the system completely Well-priced ash inserts with high capacity Catalyst to support the combustion reaction and avoid dust problems
DUMATHERM Bottom Connection Easy access without further dismounting Well-priced plastic tubing as the only part to be exchanged If dust is passing the reactor, it is trapped in the quartz wool
Reduction 650 °C copper reduced N- oxidesN2N2 We have the best copper chips with the largest surface More surface = more capacity for reaction Easy to take out the tube Easy to refill Costs acc. to price lists : LECO 250g=132 EUR Gerhardt 250g=65 EUR
Water Separation with Nafion TM Maintenance free system ! Inside: gas stream with helium, nitrogen, water and carbon dioxide Membrane: polar and chemical inert material Specific reaction with water In-built functional groups, each of them can trap 13 water molecules Outside: counterflow of pure nitrogen separates 100% of the absorbed water
News: Water Trap to analyse as well liquid samples Target: pre-condensation of 95 % of all water with automated drainage controlled by software Remaining water is separated with Nafion Easy discharging of separated water With LECO the water is trapped with Peltier technique befor going into the ballast volume If the separation was not 100 %, water condensation is found in the ballast volume = cooling down and cleaning is a must With liquid samples we have now good chances to win against LECO !!
Direct Comparison of Specifications ModelLECO TRUSPEC NDUMATHERM Positions Autosampler30 (60, 90, 120)40 (80, 120) Possible sample weights according to brochureup to 1 g Typical sample weights in reality mg mg Detection limit (in mg Nitrogen absolute)0.01 mg N0.ic01 mg N All combustion gases analysed ?no (aliquot)yes Detectorclassic TCDinnovative TCD Daily adjustment of calibrationyesno Analysis time4 to 6 minutes3 to 4 minutes Number of valves3510 Number of o-rings248 Combustion tube u-shaped quartz with dust filtersstraight quartz with catalyst