Metrohm 874 User manual

874 Oven Sample Processor

Manual

8.874.8002EN / 2019-11-11

Metrohm AG

CH-9100 Herisau

Switzerland

Phone +41 71 353 85 85

Fax +41 71 353 89 01

[email protected]

www.metrohm.com

874 Oven Sample Processor

Manual

8.874.8002EN / 2019-11-11

Technical Communication

Metrohm AG

CH-9100 Herisau

[email protected]

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.

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of contents

874 Oven Sample Processor ￭￭￭￭￭￭￭￭ III

Table of contents

1 Introduction 1

1.1 Instrument description ......................................................... 1

1.1.1 Instrument versions ................................................................. 1

1.1.2 Instrument components ........................................................... 2

1.1.3 Intended use ........................................................................... 2

1.2 About the documentation ................................................... 3

1.2.1 Symbols and conventions ........................................................ 3

1.3 Safety instructions ................................................................ 4

1.3.1 General notes on safety ........................................................... 4

1.3.2 Electrical safety ........................................................................ 4

1.3.3 Tubing and capillary connections ............................................. 5

1.3.4 Personnel safety ....................................................................... 5

1.3.5 Flammable solvents and chemicals ........................................... 6

1.3.6 Recycling and disposal ............................................................. 7

2 Overview of the instrument 8

3 Installation 11

3.1 Setting up the instrument .................................................. 11

3.1.1 Packaging .............................................................................. 11

3.1.2 Checks .................................................................................. 11

3.1.3 Location ................................................................................ 11

3.2 Connecting the instrument to the power grid ................. 11

3.3 Mounting the sample holder ............................................. 12

3.4 Mounting needles ............................................................... 13

3.5 Mounting the heating tubing ............................................ 16

3.6 Mounting the drying flask ................................................. 17

3.7 Mounting the dust filter .................................................... 19

3.8 Mounting the air/nitrogen connector ............................... 19

3.9 Mounting the safety shield ................................................ 21

3.10 Mounting the KF titration cell ........................................... 22

3.11 Inserting the heating tube into the KF titration cell ....... 23

3.12 Attaching a sample rack .................................................... 26

3.13 Adjusting the guide rod ..................................................... 27

3.14 Connecting a computer ...................................................... 27

3.15 Connecting MSB devices .................................................... 29

3.15.1 Connecting a dosing device ................................................... 31

Table of contents ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭

IV ￭￭￭￭￭￭￭￭ 874 Oven Sample Processor

3.15.2 Connecting a stirrer or titration stand .................................... 32

3.15.3 Connecting a Remote Box ..................................................... 33

3.16 Connecting USB devices ..................................................... 34

3.16.1 Connecting a barcode reader ................................................. 34

4 Processing a sample series 36

5 Operation and maintenance 37

5.1 General notes ...................................................................... 37

5.2 Care ...................................................................................... 37

6 Troubleshooting 38

6.1 Problems and their solutions ............................................. 38

7 Appendix 39

7.1 Remote interface ................................................................ 39

7.1.1 Pin assignment of the remote interfaces ................................ 39

7.2 Stirring rate ......................................................................... 41

8 Technical specifications 42

8.1 Lift and turntable ............................................................... 42

8.2 Oven ..................................................................................... 42

8.3 Gas flow .............................................................................. 42

8.4 Outlet heater ....................................................................... 43

8.5 Interfaces ............................................................................. 43

8.6 Power connection ............................................................... 43

8.7 Ambient temperature ......................................................... 43

8.8 Reference conditions .......................................................... 44

8.9 Dimensions .......................................................................... 44

9 Accessories 45

Index 46

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ Table of figures

874 Oven Sample Processor ￭￭￭￭￭￭￭￭ V

Table of figures

Figure 1 874 Oven Sample Processor front ...................................................... 8

Figure 2 874 Oven Sample Processor rear ....................................................... 9

Figure 3 Sample rack 6.2041.720 ................................................................. 10

Figure 4 Mounting the sample holder ........................................................... 12

Figure 5 Mounting the needles ..................................................................... 14

Figure 6 Mounting the tubing ....................................................................... 15

Figure 7 Mounting the heating tubing .......................................................... 16

Figure 8 Preparing the drying flasks ............................................................... 17

Figure 9 Mounting the tubings ..................................................................... 18

Figure 10 Mounting the dust filter .................................................................. 19

Figure 11 External gas connector .................................................................... 20

Figure 12 Mounting the safety shield .............................................................. 21

Figure 13 Coulometric KF titration cell ............................................................ 24

Figure 14 Volumetric KF titration cell ............................................................... 25

Figure 15 Attaching rack ................................................................................. 26

Figure 16 Adjusting the guide rod ................................................................... 27

Figure 17 Connecting the computer ................................................................ 28

Figure 18 MSB connections ............................................................................ 30

Figure 19 Connecting a dosing device ............................................................. 31

Figure 20 Connecting an MSB stirrer ............................................................... 32

Figure 21 Connecting the rod stirrer to the titration stand ............................... 32

Figure 22 Connecting the Remote Box ............................................................ 33

Figure 23 USB connectors ............................................................................... 34

Figure 24 Connectors of the Remote Box ........................................................ 39

Figure 25 Pin assignment of remote socket and remote plug ........................... 39

Figure 26 Rotational speed depending on the stirring rate ............................... 41

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction

874 Oven Sample Processor ￭￭￭￭￭￭￭￭ 1

1 Introduction

1.1 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

Sample Processor is the ideal analysis system for water content determina-

tion in samples that contain disruptive components or from which mois-

ture can be removed only with difficulty.

One of its decisive advantages is reducing sample preparation to a mini-

mum. Thanks to the use of hermetically sealed sample vessels ("headspace

vials"), samples can be filled directly on-site. The PTFE-coated septa guar-

antee a constant, unaltered water content, even after prolonged holding

times.

The sample heated in the oven module releases its moisture in the form of

water vapor, which is conveyed into a measuring cell with the aid of a gas

flow. An air pump is installed to generate the gas flow. An inlet valve is

available for nitrogen or other inert gases. The moisture can be deter-

mined in the measuring cell either coulometrically or volumetrically using

Karl Fischer titration.

The 874 Oven Sample Processor is operated and controlled via the tiamo

computer software. This enables convenient programming of method

runs, ranging from the simple to the complex. The integration of the 874

Oven Sample Processor together with other instruments, e.g. with a coul-

ometer, within one user interface does not only allow for simple opera-

tion, but also for evaluation and storage of the measurement data from all

of the connected instruments in a single database.

1.1.1 Instrument versions

The 874 Oven Sample Processor is available in two versions with different

accessories.

￭Version 2.874.0010 with accessories for the use of standard vials

(volume 6 mL).

￭Version 2.874.0020 without accessories for the use of standard vials.

Appropriate accessories can be ordered for specific vessel sizes.

1.1 Instrument description ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭

2￭￭￭￭￭￭￭￭ 874 Oven Sample Processor

1.1.2 Instrument components

The 874 Oven Sample Processor has the following components:

￭Oven

Oven module made of aluminum with software-operated temperature

control for heating the sample vessel.

￭Fan

Propeller fan for cooling the oven module.

￭Inlet valve

Valve for switching over the source of the gas flow.

￭Air pump

Pump for generating the gas flow.

￭Outlet heater

Heating tubing for preventing the condensation of moisture.

￭Lift with rods

Guidance device with needle adapter and tubing for the gas flow.

￭Turntable

For the standard sample rack with a capacity of 36 sample vials (6 mL)

or the special sample rack with a capacity of 25 sample vials (⌀ = 16 -

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 instrument is suitable for processing chemicals and flammable sam-

ples. Therefore, the use of the 874 Oven Sample Processor requires the

user to have basic knowledge and experience in handling toxic and caustic

substances. Knowledge regarding the application of fire prevention meas-

ures prescribed for laboratories is also mandatory.

Table of contents

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