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Instruction manual for
Conductivity measuring cells type
LF 513T, 613T, 713T, 713T-250,
LF 813T, 913T, 913T-ID
Picture of exemplary electrodes
Xylem Analytics Germany GmbH
Am Achalaich 11
82362 Weilheim
Germany
SI Analytics
Tel.: +49.(0)6131.66.5119
Fax: +49.(0)6131.66.5001
E-mail: Service-Sensors.si-analytics@xylem.com
www.XylemAnalytics.com
Putting into operation
The LF913 T-ID conductivity measuring cell is equipped
automatic sensor detection system in the connection plug. This system
stores the sensor type and the serial number as well as the calibration
data. To be able to use the automatic sensor detection feature, you will
need a measurement device supporting this function. For further
information, please refer to the operating instructions of the
measurement device.
2 pole measuring cells (LF 513T) are delivered platinated.
4 channel and 5 channel conductivity measuring cells (LF613T, 713T
713T-250 and LF 813T, 913T, 913T-ID) are immediately ready for use
and do not need to be platinum plated.
Please check the cell constant prior to the first use. The interval of the
next following verification will depend on the circumstances of use.
The shaft of the conductivity measuring cell has to immerse by a
minimum of 65 mm (ring mark) in the solution to be measured. The
measurement value may be read off as soon as the signal has
stabilised. In the case of temperature changes, this may take up to two
minutes.
The detachable threaded protection cap (only PPO shaft) at the front
end of the measurement cell (LF513T, 613T, 813T) will protect the glass
tube with the platinum rings and determines the cell constant.
Storage and maintenance
The storage conditions for conductivity measuring cells may be within
the range of a 0-50°C and 5-95% relative humidity. Any conditions
leading to condensation of water at the plug ought to be avoided. Prior
to any extended period of storage, the electrodes (platinum rings) of the
measuring cell should be cleaned, if applicable (please refer below), and
the measuring cell should be stored in its original cardboard box.
Cleaning
Thorough cleaning is particularly recommended prior to measuring low
conductivities. To clean the device, please detach the sensor.
Unscrew and remove the protective cap (only LF513T, 613T, 813T) of
the mesuring cell.
2 pole measuring cells should only be rinsed with water, if necessary
with diluted hydrochloric acid or sodium hydroxide. After mechanical
treatment a platination is necessary, therefore the electrode can be sent
to SI Analytics.
Contamination on the sensor can be removed with the following
procedure:
Grease or oil, carefully clean the glass part and the ring electrodes
using warm water containing a dishwashing detergent and a sponge. In
the case of serious contamination, you may also gently remove it with
an abrasive powder. In the presence of lime, please place the parts
shortly (five minutes) in acetic acid (10Vol%). To clean the protective
cap, please use a small bottle brush or a cotton bud.
When using acids, leaches and solvents for cleaning, please make sure
that they are compatible with the material of the shaft!
An optimum cleaning of the inner glass part of the LF 713 T, LF 713T-
250 and LF 913 T-ID conductivity measuring cells is achieved with a
tobacco pipe cleaner. The use of acids (exception: HF!), leaches and
solvents is uncritical for these cells.
Exemplified check and setting of the cell constant
with an
To verify the cell constant, you need test solutions, for instance the
®
SI Analytics
ampoules set LF 995. Immerse the measuring cell in a
suitable test solution by a minimum of 65 mm, for instance in KCl 0.01
mol/l. Then keep the temperature constant and set the corresponding
conductivity value on the conductometer, for instance 1.413 mS/cm at
25°C for KCl 0.01 mol/l. For other solutions or different temperatures,
please take the appropriate values from the table. To minimise the
measuring incertainty over the entire range of use, calibration should
be performed both at low and high conductivities. The appropriate cell
constant should be set as a function of the measurement range.
Setting and reading off of the cell constant is done according to the
operating instructions of the conductometer used.
Electrical conductivity mS/cm of KCl solutions as a function of
temperature
KCl-Konzentration in mol/l
Temp.(°C)
0,001
18
0,127
1,225
19
0,13
1,251
20
0,133
1,278
21
0,136
1,305
22
0,138
1,332
23
0,141
1,359
24
0,144
1,386
25
0,147
1,413
Quality
Each electrode must meet the strict quality requirements of final
testing. The durability depends mainly on the usage conditions.
Hydrofluoric acid, sodium hydroxide and hot phosphoric acid corrode
glass.
Further information
Further information can be found in our product catalogs.
Subject to technical amendment.
0,01
0,1
1
11,19
98,24
11,43
100,16
11,67
102,09
11,91
104,02
12,15
105,94
12,39
107,89
12,64
109,84
12,88
111,8
GA_LF513-613-813-913_us_T814838_210928
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