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8.4.3 Single-Point Calibration
„One point“
Calibrate the measuring signal at this one point using a defined calibration solution or a known set point value,
e. g. determined by a separate method or by means of another laboratory/field instrument. At first, you will be
prompted to dip the sensor into the corresponding calibration medium.
After this step press
. to accept the dialogue. Now, the currently measured value will be displayed. After the
measured value has attained a stable state, accept the dialogue again by pressing
. You will now be
prompted to enter the set point value.
Select the position you would like to change by using the buttons
or
and change with
or
.
Press the
-button to accept and save the entry. To cancel the input dialogue without saving the value press
+
.
As a result, you will now be given the new calibration values that will be save in the device.
8.4.4 Automatic Calibration
The automatic calibration of the oxygen content measurement is a single-point calibration in the ambient air up to
102%.
At first, you will be prompted to dip the sensor into the corresponding calibration medium (outside air).
After this step press
to accept the dialogue. Now, the currently measured value will be displayed. After the
measured value has attained a stable state, accept the dialogue again by pressing
.
As a result, you will now be given the new calibration value that will be save in the device.
8.4.5 Calibration error
In each device predefined ranges for the calibration values are stored. If the determined calibration value is out of
the range the message
!Out of limit!
appears in the calibration information CAL INFORMATION. The deter-
mined calibration value will be stored nevertheless, so that the measuring and controlling is secured. In this case
a new calibration or a replace of the sensor / sensor part (
membrane head, electrolyte
) is necessary.
9
LF 40
9.1 Application Fields LF 40
The LF 40 measures the electrical conductivity, the salinity and the temperature in accordance with the German
standard methods for the examination of water, waste water and sludge and combines the features for mobile
application in the field with the precision and comfort of a laboratory meter. LF 40 features simultaneous meas-
urement of conductivity, temperature and salinity, high measuring accuracy, multi function display with plaint text
menu structure, integrated data logging system and a rugged watertight IP 65 enclosure.
9.2 Construction LF 40
LF 40/Set comes completely with the conductivity sensor LTC0,35/23-K010-U and accessories in a protective
case. This combination operates in accordance with the standardized requirements for determination of conduc-
tivity; electrochemical probe method acc. EN ISO 27888:1993. The instrument in connection with the sensor indi-
cates the conductivity in aqueous solutions in µS or mS as well as the relevant temperature simultaneously.
All Meinsberg Conductivity Sensors are available with fixed cable and connector BK. The description of the used
conductivity sensor is listed in the separate instructions for use for the sensor.
