Do you have a question about the 874 and is the answer not in the manual?
Questions and answers
Dasari ajay
March 5, 2025
Is there any specific limit for blank determination in oven technique
2 comments:
Mr. Anderson
March 5, 2025
The blank determination in the oven technique for the Metrohm 874 requires three to five empty, tightly sealed vials as blank samples. These blank samples should be placed on Positions 1 to 3 (or 5) on the sample rack, and the sample table must include corresponding lines for blank value determination.
This answer is automatically generated
Dasari ajay
March 6, 2025
@Mr. Anderson is there any pharmacopia or any specific limit for that one
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Technical Communication Metrohm AG CH-9100 Herisau techcom@metrohm.com This documentation is protected by copyright. All rights reserved. This documentation has been prepared with great care. However, errors can never be entirely ruled out. Please send comments regarding possible errors to the address above.
1 Introduction Instrument description The 874 Oven Sample Processor is used wherever the heating of a sample and/or the thermal expulsion of moisture in solids or liquids is required. In combination with a coulometric or volumetric KF titrator, the 874 Oven...
32 mm). 1.1.3 Intended use The 874 Oven Sample Processor is designed for usage as an auxiliary device for automated sample preparation in analytical laboratories. Its main area of application is water content determination using Karl Fischer titration (coulometric or volumetric). The 874 Oven Sample Processor ena- bles the application of thermal gas extraction technology.
This symbol draws attention to a possible hazard due to heat or hot instrument parts. WARNING This symbol draws attention to a possible biological hazard. CAUTION This symbol draws attention to possible damage to instruments or instrument parts. ■■■■■■■■ 874 Oven Sample Processor...
The electrical safety when working with the instrument is ensured as part of the international standard IEC 61010. WARNING Only personnel qualified by Metrohm are authorized to carry out service work on electronic components. WARNING Never open the housing of the instrument. The instrument could be damaged by this.
Personnel safety WARNING Wear protective goggles and working clothes suitable for laboratory work while operating the 874 Oven Sample Processor. It is also advisa- ble to wear gloves when caustic liquids are used or in situations where glass vessels could break.
WARNING The 874 Oven Sample Processor is not suitable for utilization in bio- chemical, biological or medical environments in its basic equipment ver- sion.
The correct disposal of your old instrument will help to prevent negative effects on the environment and public health. More details about the disposal of your old instrument can be obtained from your local authorities, from waste disposal companies or from your local dealer. ■■■■■■■■ 874 Oven Sample Processor...
■■■■■■■■■■■■■■■■■■■■■■ 2 Overview of the instrument Figure 1 874 Oven Sample Processor front Safety shield (6.2751.140) Conditioning position For the conditioning vessel. Sample rack (6.2041.720) Turntable For 36 sample vials (6 mL). Guide bolts Guide rod For the sample rack.
18 Oven housing With PTFE covering. With ventilation slits. US B 2 Figure 2 874 Oven Sample Processor rear USB connector (USB 1 and USB 2) Controller connector USB ports (type A) for connecting a printer, For connecting a computer with installed USB hub, Titrandos, additional USB devices computer software.
■■■■■■■■■■■■■■■■■■■■■■ MSB connector (MSB 1 to MSB 3) Power socket Metrohm Serial Bus. For connecting external dosing devices, stirrers or Remote Boxes. Mini DIN, 9-pin. Type plate Warning symbol Contains specifications concerning supply Biological hazard, (see chapter 1.3.4, page voltage, instrument type and serial number.
Unplug the power plug immediately if you suspect that moisture has ■ gotten inside the instrument. Only personnel who have been issued Metrohm qualifications may ■ perform service and repair work on electrical and electronic parts. ■■■■■■■■...
Connect the power cord to the power grid. ■ Mounting the sample holder The dimensions of the supplied sample holder are optimized for the use of 6.2419.007 6-mL sample vials by Metrohm . This ensures the best possible transfer of heat between oven and sample. 6.2063.020 6.2627.010...
Needle holders with the dimensions required for situations calling for spe- cial sample vessels can be supplied by Metrohm upon request. ■■■■■■■■ 874 Oven Sample Processor...
4 Screw the 6.1805.470 FEP tubing onto the opening of the distri- butor by hand. Screw the other end of the tube into the opening of the gas outlet on the upper side of the tower. ■■■■■■■■ 874 Oven Sample Processor...
50 °C as soon as the instrument is switched on. This prevents conden- sation of moisture in the tubing when it is removed from the sample and transferred to a KF titration cell with a carrier gas. ■■■■■■■■ 874 Oven Sample Processor...
If drying flask caps or filter tubes are not tightened well, the gas flow may not be precise and regular. An error message displaying an erroneous gas flow usually appears when there are leaks in the threaded connections. ■■■■■■■■ 874 Oven Sample Processor...
M6 connectors of the drying flasks. The marking Drying flask on the left-hand side of the tower dis- plays the diagram for the tubing. NOTICE Tighten the screw connections well by hand. ■■■■■■■■ 874 Oven Sample Processor...
Enclosed with the instrument is the 6.1808.040 M6/M8 thread adapter for a tubing with an M8 thread. The 6.1808.050 tubing adapter olive can additionally be put in place in order to connect a simple tubing. ■■■■■■■■ 874 Oven Sample Processor...
Figure 11 External gas connector WARNING If gas is fed from a pressure line or a pressure vessel, a pressure reduc- tion valve must be activated. The gas pressure must not exceed 0.3 bar of overpressure. ■■■■■■■■ 874 Oven Sample Processor...
Figure 12 Mounting the safety shield WARNING The safety shield must be installed before the 874 Oven Sample Pro- cessor is used for the first time. The device may not be operated with- out a safety shield. Proceed as follows: 1 Undo the hex screws on the sides of the tower with the accompany- ing hex key.
The following description is provided as an example for the mounting of a coulometric KF titration cell. The necessary accessory parts are, with the exception of the 6.2013.010 clamping ring, not included in the scope of delivery of the 874 Oven Sample Processor. 6.1403.030 6.0341.100 6.0345.100...
3.11 Inserting the heating tube into the KF titration cell The 874 Oven Sample Processor can be used in combination with a KF coulometer or a volumetric KF titrator. The mounting of the tip of the heating tube is accomplished in different ways for the respective KF titra- tion cells.
E.3010.032 O-ring. The latter you will still need. A 6.2730.020 septum stopper is enclosed with every KF titrator ■ made by Metrohm. Disassemble this septum stopper into three parts and remove the septum. It will not be required. ■■■■■■■■ 874 Oven Sample Processor...
The tip must not however be permitted to get in the way of the stirring bar in the KF titration cell. Afterwards give the septum stop- per its final tightening. ■■■■■■■■ 874 Oven Sample Processor...
Figure 15 Attaching rack The turntable of the 874 Oven Sample Processor must be in starting posi- tion before the sample rack can be removed or put it into place. To accomplish this, carry out the [Rack Reset] function in the manual con- trol of the control software.
Cable connection and driver installation A driver installation is required in order to ensure that the 874 Oven Sam- ple Processor is recognized by the computer software. To accomplish this, you must comply with the procedures specified. The following steps are...
The plug on the instrument end of the 6.2151.000 controller cable is protected against accidental disconnection by means of a pull-out pro- tection feature. If you wish to pull out the plug, you first need to pull back the outer plug sleeve marked with arrows. ■■■■■■■■ 874 Oven Sample Processor...
In order to connect MSB devices, e.g. stirrers or dosing devices, Metrohm instruments are equipped with up to a maximum of four connectors on what is referred to as the Metrohm Serial Bus (MSB). Various kinds of peripheral devices can be connected in sequence (in series, as a "Daisy Chain") at a single MSB connector (8-pin Mini DIN socket) and con-...
MSB connector. The operating unit or the control software enters the connected MSB devices into the system configuration (device manager). MSB connections can be extended with the 6.2151.010 cable. The maxi- mum connection length permitted is 15 m. ■■■■■■■■ 874 Oven Sample Processor...
685 Dosimat plus ■ WARNING If a Dosino is connected to the 874 Oven Sample Processor, then the connection cable must be equipped with a T.2400.102 ferrite core. The ferrite core diminishes any interference voltages and thus ensures com- pliance with the strict EMC standards in accordance with the applicable technical standards, see EU declaration of conformity of the instrument.
(socket with stirrer symbol) of the titration stand. Start the control software. ■ US B 1 Co ntr . MS B 2 MS B 3 Figure 20 Connecting an MSB stirrer Figure 21 Connecting the rod stirrer to the titration stand ■■■■■■■■ 874 Oven Sample Processor...
Instruments that are controlled via remote lines and/or that send control signals via remote lines can be connected via the 6.2148.010 Remote Box. In addition to Metrohm, other instrument manufacturers also use similar connectors that make it possible to connect different instruments together.
Connecting USB devices Two USB connectors (type A sockets) are available for connecting instru- ments with an USB interface. The 874 Oven Sample Processor then func- tions as USB hub (distributor). If you wish to connect more than two USB devices, you can also use an additional, commercially available USB hub.
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02 (STX or Ctrl B) to be sent as the first character. Set the "Postamble", "Record Suffix" or "Postfix Code" for the ■ ASCII character 04 (EOT or Ctrl D) to be sent as the last character. Close programming mode. ■ ■■■■■■■■ 874 Oven Sample Processor...
Place an empty, sealed vial as conditioning vessel at the Cond. Pos. position on the sample rack of the 874 Oven Sample Processor. The empty blank samples are placed on Positions 1 to 3 (or 5) on the sample rack.
5 Operation and maintenance 5 Operation and maintenance General notes The 874 Oven Sample Processor requires appropriate care. Excess contam- ination of the instrument may result in malfunctions and a reduction in the service life of the sturdy mechanical and electronic components.
System is leaking Check all tubing connections and drying flasks not achieved. for leaks. Pressure from external gas Adjust gas pressure (max. 0.3 bar). supply either too low or too high. Pump defective Contact a service technician. ■■■■■■■■ 874 Oven Sample Processor...
Pin assignment of remote socket and remote plug The above figure of the pin assignment of a Metrohm remote interface does not only apply for the Remote Box, but also for all Metrohm devices with 25-pin D-Sub remote connectors. ■■■■■■■■...
Rotational speed in revolutions per minutes = 125 · 8 = 1,000 r/min 2000 1500 1000 Figure 26 Rotational speed depending on the stirring rate The information on the separately connectable 802 propeller stirrer can be found in the "802 Stirrer" manual. ■■■■■■■■ 874 Oven Sample Processor...
Dependent on temperature, supply voltage, sample amount and vessel dimensions Cooling rate Typically 9 °C/min (at 80 - 180 °C) Dependent on temperature, sample amount and vessel dimensions Gas flow Flow range 10 - 150 mL/min Under normal conditions ■■■■■■■■ 874 Oven Sample Processor...
Three 9-pin Mini DIN sockets for connecting dosing devices (Dosino/ Dosimat), stirrers, etc. USB connectors Two USB downstream ports (type A sockets), each 500 mA, for con- necting Metrohm instruments or USB peripheral devices of other man- ufacturers. Power connection Supply voltage...
+25 °C (±3 °C) ture ≤ 60% Relative humidity Supply voltage 230 V Dimensions Width 0.28 m Height 0.55 m Depth 0.49 m 15.50 kg Weight (without accessories) Material (housing) Metal housing, surface-treated Oven covering: PTFE ■■■■■■■■ 874 Oven Sample Processor...
Downloading the accessories list 1 Enter https://www.metrohm.com/ into your Internet browser. 2 Enter the article number (e.g. 874) into the search field. The search result is displayed. 3 Click on the product. Detailed information regarding the product is shown on various tabs.
Need help?
Do you have a question about the 874 and is the answer not in the manual?
Questions and answers
Is there any specific limit for blank determination in oven technique
The blank determination in the oven technique for the Metrohm 874 requires three to five empty, tightly sealed vials as blank samples. These blank samples should be placed on Positions 1 to 3 (or 5) on the sample rack, and the sample table must include corresponding lines for blank value determination.
This answer is automatically generated
@Mr. Anderson is there any pharmacopia or any specific limit for that one