runge mikron 81 User manual

mikron 81 conductivity meter
Operations manual
mikron 81
leitfähigkeitsmeßgerät

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© 2021
Wissenschaftliche Gerätebau „F. F. Runge“ Gmb
(“F. F. Runge” Scientific Instruments)
David-Gilly-Straße 1
14469 Potsdam
Germany
Telephone +49 (0) 3 31 / 96 79 75 00
Telefax +49 (0) 3 31 / 96 79 75 02
E-Mail [email protected]
Internet www.ff-runge.de
We reserve the right to make changes
Reprints – even for excerpts – not permitted
Runge is a registered trademark of Wissenschaftliche Gerätebau „F. F. Runge“ Gmb .
Any other marks and protected trademarks named in the following are the property of their respective owners.
Printed in Germany 81.6A0.2106.en

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Table of contents
Introduction............................................................................................................................................................ 5
Safety regulations............................................................................................................................................... 6
Intended use...................................................................................................................................... 6
Occupational safety......................................................................................................................... 7
Ambient conditions........................................................................................................................... 7
An overvie of the detector........................................................................................................................... 8
Technical data....................................................................................................................................................... 9
Method of measurement.............................................................................................................................. 10
Equipment delivered...................................................................................................................... 11
Setting up............................................................................................................................................................. 12
Mounting, fastening....................................................................................................................... 12
Liquid connectors.......................................................................................................................... 14
Electrical connection..................................................................................................................... 15
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Operation.............................................................................................................................................................. 16
Switching on and off...................................................................................................................... 16
Display of the operating status.................................................................................................... 16
Choice of data rate and time constant...................................................................................... 17
Measurement by temperature equalisation............................................................................... 18
Determining the specific temperature coefficient for the material........................................19
Rinsing, cleaning and storing the measurement cell...............................................................19
Replacing the measurement cell................................................................................................. 20
Calibration....................................................................................................................................... 22
Trouble shooting............................................................................................................................................... 23
Annexe 1: Spare parts list............................................................................................................................ 25
Annexe 2: GLP detector specifications.................................................................................................. 27
Conformity declaration.................................................................................................................................. 29
UK Declaration of Conformity acc. to BS EN ISO/IEC 17050-1...............................................30

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Introduction
Thank you for deciding for a Runge detector.
Our mikron apparatus differs both in its concept and size from traditional detectors: it gives
you the the performance of advanced laboratory detectors in the form of a test head. This
gives you new application possibilities. Important aims in its development were durability,
ease of maintenance and a good price/performance ratio.
We develop and produce all Runge instruments in Germany. We rely on competent
suppliers in Brandenburg and in Berlin. We hope that you will be satisfied with our detector
in its day to day usage and that we can gain your long-term custom.
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Safety regulations
This detector meets the prescribed safety regulations. Incorrect operation can however lead
to injury and damage. Consequently read these operating instructions carefully before put-
ting the detector into operation.
Runge cannot accept responsibility for damage caused by not following these instructions.
Intended use
This detector is to be used in analytical and preparative liquid chromatography equipment
and in general for the photometric analysis of liquids. The insertion and operation of the
detector shall only be carried out by trained laboratory technicians with knowledge in this
field and experience in handling the chemicals used.

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Occupational safety
When using the apparatus observe the health and safety regulations (among others those
concerning protective clothing and laboratory equipment). In the United Kingdom, relevant
information is provided by the ealth and Safety Executive. In Ireland it is the ealth and
Safety authority, in Australia, Safe Work Australia and in New Zealand, Worksafe. In the
United States of America it is the OS A, in Canada the CSC.
Ambient conditions
The detector is to be operated only in the following conditions:
•Temperature 3...45 °C (37.4...113 °F)
•umidity 0...90 %, non-condensing
•Atmosphere: air in room, inert gas, no explosive or corrosive fumes
•No direct sunlight (danger of overheating)
•No ignition sources in the vicinity of flammable solvents
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An overvie of the detector
1 2
3
4
5
6
3
3
3
1 measurement cell (various types can be supplied)
2 detector block
3 liquid joint
4 status indicator
5 electrical connection (USB-C or RS-485)
6 name plate
Fig. 1: The mikron 81 detector

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Technical data
Type mikron 81, conductivity meter
Conduct. measuring range mS/cm (Z=10/cm) indicating 0.002 … 100 linear 0.002 … 100
mS/cm (Z=50/cm) indicating 0.010 … 500 linear 0.010 … 300
Conductivity accuracy % (Z=10/cm) ±2 % / ±1 mS/cm (the higher value applies)
(Z=50/cm) ±2 % / ±2 mS/cm (the higher value applies)
Conductivity scanning rate z 10
Temperature meas. range °C 0 … 100 +/– 0,1
Temperature scanning rate z 10
Power take-up W < 2,5
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Method of measurement
The concentration, valence and mobility of the ions dissolved in the liquid indicates its
composition, for example the salt content. The electric conductivity of the liquid is
proportional to the aforementioned ion properties, with their mobility depending on the
temperature of the liquid. The conductivity is measured with a high degree of accuracy by
applying an AC voltage to a cuvette (either filled with the liquid or subjected to a flow of the
liquid) of known measurements (cross-sectional area, separation of the electrodes) via the
zero voltage point (UW = 0) of a Wien bridge.
2
3
1
1 measuring cell
2 electrode
3 sample
Across-section
ldistance
G conductance
Zimpedance
Uq~ source voltage
UW Wien voltage
l
Gcell
σ=
R1
Z3
Fig. 2: Using a Wien measurement bridge for measuring electrical conductivity
[σ]= S/m
Al
2 2
Zcell
U
R2
Zcell
q~
U
q~
UW
V
3A