Metrohm 893 Manual de usuario

893 Professional Biodiesel Rancimat

Manual

8.893.8001EN / 2020-01-28

Metrohm AG

CH-9100 Herisau

Switzerland

Phone +41 71 353 85 85

Fax +41 71 353 89 01

[email protected]

www.metrohm.com

893 Professional Biodiesel Rancimat

Manual

8.893.8001EN / 2020-01-28

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

893 Professional Biodiesel Rancimat ￭￭￭￭￭￭￭￭ III

Table of contents

1 Introduction 1

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

1.2 About the documentation ................................................... 2

1.2.1 Symbols and conventions ........................................................ 2

1.3 Safety instructions ................................................................ 3

1.3.1 General notes on safety ........................................................... 3

1.3.2 Electrical safety ........................................................................ 3

1.3.3 Flammable solvents and chemicals ........................................... 5

1.3.4 Recycling and disposal ............................................................. 5

2 Overview of the instrument 6

2.1 Front of the instrument ........................................................ 6

2.2 Rear of the instrument ......................................................... 7

2.3 Instrument display ................................................................ 8

3 Installation 10

3.1 Setting up the instrument .................................................. 10

3.1.1 Packaging .............................................................................. 10

3.1.2 Checks .................................................................................. 10

3.1.3 Location ................................................................................ 10

3.2 Mounting accessories ......................................................... 11

3.2.1 Mounting the internal air supply ............................................ 11

3.2.2 Mounting the external air supply ........................................... 13

3.2.3 Assembling the reaction and measuring vessels ..................... 14

3.2.4 Inserting vessels / Establishing tubing connections ................. 17

3.2.5 Mounting the exhaust air collection tube ............................... 18

3.3 Power connection ............................................................... 19

3.3.1 Connecting the power cord to the energy supply ................... 19

3.3.2 Replacing fuses ...................................................................... 20

3.3.3 Switching the instrument on and off ...................................... 21

3.4 Connecting a computer ...................................................... 22

3.4.1 Connecting the 893 Professional Biodiesel Rancimat and the

computer .............................................................................. 22

4 Operation 24

4.1 Rancimat method ............................................................... 24

4.2 Calibration functions .......................................................... 25

4.2.1 Determining the cell constant ................................................ 25

4.2.2 Determining the temperature correction ................................ 26

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

IV ￭￭￭￭￭￭￭￭ 893 Professional Biodiesel Rancimat

4.3 Determinations ................................................................... 29

4.3.1 Preparing the instrument and the accessories ......................... 29

4.3.2 Preparing the determination .................................................. 30

4.3.3 Cleaning the accessories ........................................................ 32

4.3.4 Cleaning the oil separator ...................................................... 33

5 Operation and maintenance 36

5.1 General notes ...................................................................... 36

5.1.1 Care ...................................................................................... 36

5.1.2 Maintenance by Metrohm Service .......................................... 36

5.1.3 Cleaning the instrument ........................................................ 37

5.2 Replacing the dust filter .................................................... 38

5.3 Regenerating or replacing the molecular sieve ............... 39

6 Troubleshooting 40

6.1 Problems .............................................................................. 40

7 Technical specifications 45

7.1 General data ........................................................................ 45

7.2 Temperature control and measurement ........................... 45

7.3 External temperature sensor ............................................. 46

7.4 Conductivity measurement ................................................ 46

7.5 Gas flow regulation ............................................................ 47

7.6 USB interface ...................................................................... 47

7.7 Power socket ...................................................................... 47

7.8 Ambient temperature ......................................................... 47

7.9 Dimensions/Material .......................................................... 48

8 Accessories 49

Index 50

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

893 Professional Biodiesel Rancimat ￭￭￭￭￭￭￭￭ V

Table of figures

Figure 1 Front 893 Professional Biodiesel Rancimat ......................................... 6

Figure 2 893 Professional Biodiesel Rancimat rear ........................................... 7

Figure 3 Instrument display ............................................................................. 8

Figure 4 Mounting accessories for the air supply ........................................... 11

Figure 5 Drying flask - Individual parts ........................................................... 12

Figure 6 Drying flask mounted in place ......................................................... 13

Figure 7 Equipping the reaction and measuring vessels ................................. 15

Figure 8 Mounting the air tube: correct - incorrect ........................................ 17

Figure 9 Mounting the foam barrier .............................................................. 17

Figure 10 Instrument display with instrument name ........................................ 21

Figure 11 Instrument display with "no connection" symbol ............................. 21

Figure 12 Instrument display without instrument name and symbol ................ 22

Figure 13 Instrument display with serial number ............................................. 22

Figure 14 Measuring arrangement (schematic representation) ......................... 25

Figure 15 Assembling the reaction vessel for determining the temperature correc-

tion ................................................................................................. 27

Figure 16 Oil separator (6.2753.200), disassembled ........................................ 34

Figure 17 Dust filter - conditions ..................................................................... 38

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction

893 Professional Biodiesel Rancimat ￭￭￭￭￭￭￭￭ 1

1 Introduction

1.1 Instrument description

The 893 Professional Biodiesel Rancimat is a computer-controlled measur-

ing device for determining the oxidation stability of biodiesel and biodiesel

blends (mixture of biodiesel and conventional diesel fuel) according to the

standards EN 14112 and EN 15751.

It is equipped with two heating blocks each with 4 measuring positions.

Each block can be heated individually, i.e., 4 samples can each be mea-

sured at two different temperatures or 8 samples at the same tempera-

ture. The measurements at the individual measuring positions can be

started individually for this.

The 893 Professional Biodiesel Rancimat is controlled by means of the

StabNet computer software and a computer that is connected via the

USB interface. Up to 4 instruments can be controlled and monitored by

each computer, hence allowing a maximum of 32 samples to be analyzed

at the same time. The evaluation algorithm of the computer software

determines the break point of the Rancimat curve and thus the induction

time fully automatically. Besides the induction time, the so-called stabil-

ity time, i.e., the time until a defined conductivity change has been

achieved, can also be determined. In the case of conductivity changes

(stages) which do not have anything to do with the autoxidation, the eval-

uation can be suspended for definite time intervals. The results deter-

mined can be further processed mathematically.

Each Rancimat curve can also be evaluated manually. A computer-sup-

ported tangential method is available for this, in which you can position

the tangents anywhere on your curves. This makes evaluations possible in

extreme cases as well.

The results of the determinations are saved in a database together with all

method and determination data. Determinations can be searched for,

sorted, filtered, exported and printed in the Database program part.

Apart from graphically displaying individual and multiple curves, the soft-

ware is also capable of conducting recalculations with changed parame-

ters and extrapolating the results to a certain temperature.

1.2 About the documentation ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭

2￭￭￭￭￭￭￭￭ 893 Professional Biodiesel Rancimat

1.2 About the documentation

CAUTION

Please read through this documentation carefully before putting the

instrument into operation. The documentation contains information

and warnings which the user must follow in order to ensure safe opera-

tion of the instrument.

1.2.1 Symbols and conventions

The following symbols and formatting may appear in this documentation:

Cross-reference to figure legend

The first number refers to the figure number, the sec-

ond to the instrument part in the figure.

Instruction step

Carry out these steps in the sequence shown.

Method Dialog text, parameter in the software

File ▶ New Menu or menu item

[Next] Button or key

WARNING

This symbol draws attention to a possible life-threat-

ening hazard or risk of injury.

WARNING

This symbol draws attention to a possible hazard due

to electrical current.

WARNING

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.

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