885 Compact Oven Sample Changer Affordable, automated sample preparation for Karl Fischer titration Automated thermal sample preparation for Karl Fischer titration The 885 Compact Oven Sample Changer is the so lu tion The substance to be analyzed is weighed out into a sample 02 for thermal sample preparation in Karl Fischer titration. In vial, which is then hermetically sealed. The sample is placed the oven the samples can be heated up to 250 °C. The on the changer and heated in the oven. A double hollow moisture contained in the sample evaporates and is trans-needle pierces the septum and a dry stream of carrier gas ported by a stream of dry carrier gas into the titration cell, transports the released water to the titration cell. where the analysis proper takes place. The advantage of the oven method is that the sample Principle and applications of the oven method itself does not get in contact with the KF reagent. This The oven method is suitable for samples that release their prevents contamination of the oven and titration cell; water only at high temperatures, are difficult to dissolve carryover or memory effects that could distort the results or react with the KF reagent. of the analysis are ruled out. Diagram of oven method Advantages of the 885 Compact Oven Sample Changer • Small footprint • Great flexibility 03 The name of the 885 Compact Oven Sample Changer Depending on the sample, Karl Fischer titration can says it all: the instrument provides automation in a very be performed coulometrically or volumetrically. Either small space. After the sample has been weighed in, the way, the 885 Compact Oven Sample Changer can hermetically sealed vials are simply placed on the rack be operated with all stand-alone Karl Fischer titrators of the sample changer and the sample series is started. with sample table. One sample after the other is automatically delivered for analysis. • Easy to use The 885 Compact Oven Sample Changer is controlled by way of the integral keypad. Only the oven temperature and the gas flow need to be defined and the number of test samples set. If the titrator is linked with a balance, not even the weight of the samples need to be entered manually. • Reusable sample vials Screw-cap vials are used with the 885 Compact Oven Sample Changer. After measuring, this type of sample vial can be opened and cleaned without any problem and then reused. Only the pierced septum needs to be replaced. Technical specifications Rack positions 18 Temperature range 50–250 °C Heating rate typically 15 °C/min Cooling rate typically 9 °C/min Gas flow 10–150 mL/min Nominal operation range 5–45 °C Humidity < 80% Voltage 100–120 / 220–240 V Frequency 50 / 60 Hz Power input 200 W Ordering information 2.885.0010 Compact Oven Sample Changer Optional accessories 2.756.0110 756 KF Coulometer 2.831.0110 831 KF Coulometer 2.851.0120 851 Titrando Coulometer with diaphragmless generator electrode and 900 Touch Control 2.852.0160 852 Titrando Coulometer with diaphragmless generator electrode and 900 Touch Control 2.890.0110 890 Titrando with 900 Touch Control 2.899.0110 899 Coulometer with generator electrode without diaphragm 6.1448.067 Screwcap with septum (100 pieces) 6.1448.077 Septum for 6.1448.067 (100 pieces) 6.2420.007 Sample vessel (8 mL) with thread (100 pieces) 6.2141.340 Remote-cable Compact Oven Sample Changer – Coulometer/Titrando 6.2148.010 Remote box G, CH-9100 Herisau ohm A witzerland by Metr www.metrohm.com , printed in S SW 12 Subject to change Layout by Ecknauer+Schoch A 8.885.5000EN – 2014-