Operating manual
AR
O
C
A
L
AR
S
/
cm
Tref25
nLF
0
5
2
3
0
5
°
C
TP
M
handylab LF 11
ba75365d04 01/2011
Conductivity Meter
handylab LF 11
Accuracy when
going to press
Warranty We guarantee the instrument described for 3 years from the date of
The use of advanced technology and the high quality standard of our
instruments are the result of continuous development. This may result
in differences between this operating manual and your instrument. Also, we cannot guarantee that there are absolutely no errors in this manual. Therefore, we are sure you will understand that we cannot accept
any legal claims resulting from the data, figures or descriptions.
purchase.
The instrument warranty covers manufacturing faults that are discovered within the warranty period. The warranty does not cover components that are replaced during maintenance work, e.g. batteries.
The warranty claim extends to restoring the instrument to readiness for
use but not, however, to any further claim for damages. Improper handling or unauthorized opening of the instrument invalidates any warranty claim.
Copyright
© 2011, SI Analytics GmbH
Reproduction in whole - or even in part - is prohibited without the
express written permission of SI Analytics GmbH, Mainz.
Printed in Germany.
2
ba75365d04 01/2011
handylab LF 11 List of contents
handylab LF 11 - List of contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Switching on the measuring instrument . . . . . . . . . . . . . . . . . 15
4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.2 Conductivity / Resistivity . . . . . . . . . . . . . . . . . . . . . . . 17
4.2.3 Salinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.4 TDS (Total dissolved solids) . . . . . . . . . . . . . . . . . . . . 18
4.3 Determining/setting up the cell constant [C] . . . . . . . . . . . . . . 20
4.3.1 Determining the cell constant (calibrating in the
control standard) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3.2 Setting the cell constant manually . . . . . . . . . . . . . . . 23
4.3.3 Setting the temperature compensation TC . . . . . . . . . 26
4.4 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.5 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . . . . . 33
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3
List of contents handylab LF 11
4
ba75365e04 01/2011
handylab LF 11 Overview
AR
O
C
A
L
AR
S
/
cm
Tref25
nLF
0
5
2
3
0
5
°
C
TP
1
2
3
M
1 Overview
The compact precision handheld meter handylab LF 11 enables you to carry
out conductivity measurements rapidly and reliably.
The handylab LF 11 provides the maximum degree of operating comfort, reliability and measuring certainty for all applications.
The proven procedure for adjusting or setting the cell constant and the special AutoRead function support you in your work with the handylab LF 11.
1 Keypad
2 Sample display
3 Jack field
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5
Overview handylab LF 11
CAL
RUN/ENTER
AR
M
M
CAL
AR
RUN/ENTER
1.1 Keypad
Key functions
Select the measuring mode <M>:
– Conductivity/Resistivity
– Salinity
– Total dissolved solids (TDS)
Switch measuring instrument on/off
<ON/OFF>
– Determine or set up the cell constant
– Select temperature compensation
<CAL>
Activate/deactivate the AutoRead function
<AR>
Increase values, scroll
<V >
Decrease values, scroll
<W >
Confirm entries, start AutoRead
<RUN/ENTER>
6
ba75365e04 01/2011
handylab LF 11 Overview
mg/l
%
/
K
RCL
Auto
Store
Lin
Time
Baud
Day.Month No.
Ident
Year
S
AutoCal DIN
AutoCal TEC
%
mV/pH
Sal
°
F
mbar
OUpH
8
8.
8
8
8
8
°
LoBat
Cal
ARng
AR
TP
1
m
S/
cm
Sal
cm
1/
C
Tref25
Tref20
nLF
M
cm
TDS
Status display
Meas. value display
Function and
temperature display
Sensor symbol
1
1.2 Display
1.3 Jack field
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1 Conductivity measuring cell
Caution
Only connect conductivity measuring cells to the measuring instrument that
cannot return any voltages or currents that are not allowed
(> SELV and > current circuit with current limiting).
Nearly all measuring cells - especially SI Analytics measuring cells - fulfill
these conditions.
7
Overview handylab LF 11
1.4 Technical Data
Dimensions
and weight
Mechanical
structure
Electrical safety
Test certificates
Ambient
conditions
Length [mm] 172
Width [mm] 80
Height [mm] 37
Weight [kg] Approx. 0.3
Type of protection IP 66
Protective class III
cETLus, CE
Storage - 25 °C ... + 65 °C
Operation -10 °C ... + 55 °C
Relative atmospheric
< 90 % of annual average
humidity
Measuring ranges
ϰ [µS/cm]
0.000 ... 1.999
(only for cell constant = 0.010 cm
-1
)
0.00 ... 19.99
(only at a cell const. = 0.010 cm
cell const. = 0.090 ... 0.110 cm
-1
-1
and
)
0.0 ... 199.9
0 ... 1999
ϰ [mS/cm]
0.00 ... 19.99
0.0 ... 199.9
0 ... 500
Spec. resistance
[MΩ*cm]
0.000 ... 1.999
0.00 ... 19.99
0.0 ... 199.9
0 ... 1999
SAL 0.0 ... 70.0 according to the IOT table
TDS [mg/l] 0 ... 1999
Factor can be set to between 0.40 ... 1.00
T [°C] − 5.0 ... + 105.0
8
ba75365e04 01/2011
handylab LF 11 Overview
Accuracy
(±1 digit)
ϰ ,
Resistivity
No compensation: 0.5 %
Nonlinear compensation :
Precision Sample temperature
± 0.5 % 0 °C ... 35 °C
according to EN 27 888;
± 0.5 % 35 °C ... 50 °C
extended nLF function
Linear compensation
Accuracy Sample temperature
± 0.5 % 10 °C ... 75 °C
(The accuracy percentage always refers to
the measured value.)
SAL Range 0.0 ... 42.0
Accuracy Sample temperature
± 0.1 5 °C ... 25 °C
± 0.2 25 °C ... 30 °C
Cell constant,
calibration
Cell constant,
selection
Reference
temperature
TDS [mg/l] 1
T [°C] NTC 30:
Accuracy ± 0.1
PT 1000:
Accuracy Operating temperature
± 0.5 0 °C ... 15 °C
± 0.1 5 °C ... 35 °C
± 1 35 °C ... 55 °C
C [cm-1] 0.450 ... 0.500
0.800 ... 1.200
C [cm-1] 0.010 fixed
0.090 ... 0.110
0.250 ... 2.500
Tref Can be set to 20 °C or 25 °C
Temperature input
ba75365e04 01/2011
Manual [°C] -5 ... +100
9
Overview handylab LF 11
FCC Class A Equipment Statement
Note: This equipment has been tested and found to comply with
the limits for a Class A digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is
operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause
harmful interference in which case the user will be required to
correct the interference at his own expense.
Power supply
Batteries 4 x 1.5 V alkali-manganese batteries, Type
AA
Operational life Approx. 2500 operating hours (depending
on conductivity)
Applicable
guidelines and
norms
EMC EC guideline 2004/108/EC
EN 61326-1
EN 61000-3-2
EN 61000-3-3
FCC Class A
Instrument safety EC guideline 2006/95/EC
EN 61010-1
ANSI/UL 61010-1
CAN/CSA-C22.2 No. 61010-1
Climatic class VDI/VDE 3540
Type of protection EN 60529
10
ba75365e04 01/2011
handylab LF 11 Safety
2Safety
This operating manual contains basic instructions that you must follow during
the commissioning, operation and maintenance of the conductivity measuring instrument. Consequently, all responsible personnel must read this operating manual before working with the measuring system. The operating
manual must always be available within the vicinity of the measuring system.
Target group The measuring instrument was developed for work in the field and in the lab-
oratory.
We assume that, as a result of their professional training and experience, the
operators will know the necessary safety precautions to take when handling
chemicals.
Safety
instructions
Further notes
The individual chapters of this operating manual use safety instructions such
as the label shown below to indicate various hazards or dangers:
Caution
indicates instructions that must be followed precisely in order to avoid the
possibility of slight injuries or damage to the instrument or the environment.
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating manuals.
2.1 Authorized use
The authorized use of the measuring instrument consists exclusively of the
measurement of conductivity, salinity, temperature and TDS (total dissolved
solids) in the field and laboratory.
The technical specifications as given in section 1.4 T
observed. Only the operation and running of the measuring instrument according to the instructions given in this operating manual is authorized.
Any other use is considered to be unauthorized.
ECHNICAL DATA must be
ba75365e04 01/2011
11
Safety handylab LF 11
2.2 General safety instructions
This instrument is built and inspected according to the relevant guidelines
and norms for electronic measuring instruments (see section 1.4 T
D
ATA).
It left the factory in a safe and secure technical condition.
ECHNICAL
Function and oper-
ating safety
The smooth functioning and operational safety of the measuring instrument
can only be guaranteed if the generally applicable safety measures and the
specific safety instructions in this operating manual are followed during operation.
The smooth functioning and operational safety of the measuring instrument
can only be guaranteed under the environmental conditions that are specified
in section 1.4 T
ECHNICAL DATA.
If the instrument was transported from a cold environment to a warm environment, the formation of condensate can lead to the faulty functioning of the instrument. In this event, wait until the temperature of the instrument reaches
room temperature before putting the instrument back into operation.
Safe operation If safe operation is no longer possible, the instrument must be taken out of
service and secured against inadvertent operation!
Safe operation is no longer possible if the measuring instrument:
z has been damaged in transport
z has been stored under adverse conditions for a lengthy period of time
z is visibly damaged
Obligations of the
purchaser
z no longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the instrument.
The purchaser of the measuring instrument must ensure that the following
laws and guidelines are observed when using dangerous substances:
z EEC directives for protective labor legislation
z National protective labor legislation
z Safety regulations
z Safety datasheets of the chemical manufacturers.
12
ba75365e04 01/2011
handylab LF 11 Commissioning
3 Commissioning
3.1 Scope of delivery
z Handheld meter, handylab LF 11
z Operating manual and short operating manual
z 4 batteries, 1.5 V Mignon type AA (in the instrument)
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13
Commissioning handylab LF 11
14
ba75365e04 01/2011
handylab LF 11 Operation
4 Operation
4.1 Switching on the measuring instrument
1 Connect a conductivity measuring cell to the measuring instrument.
2 Press the <ON/OFF> key.
The display test appears briefly on the display.
Subsequently, the selected cell constant and the temperature compensation that was set up appear for approx. one second one after
the other.
The measuring instrument then automatically switches to the measuring mode that was last selected.
Note
The measuring instrument has an energy saving feature to avoid unnecessary battery depletion. The energy saving feature switches the measuring instrument off if no key has been pressed for an hour. The energy saving
feature is not active when the AutoStore function is active.
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15
Operation handylab LF 11
4.2 Measuring
4.2.1 General information
Preparatory
activities
Temperature
sensor
Temperature
compensation
Perform the following preparatory activities when you want to measure:
1 Connect the conductivity measuring cell to the measuring instru-
ment.
2 In conjunction with the measuring cell, check or calibrate the measur-
ing instument. How to calibrate is described in section 4.3.
3 Select the measuring mode with <M>.
Only carry out measurements with a temperature sensor. The temperature
sensor is shown on the display by TP.
Note
The conductivity measuring instrument automatically recognizes the type of
the temperature sensor used. This enables to connect measuring cells with
the NTC30 or Pt1000.
The instrument has a nonlinear temperature compensation that can be
switched off (see section 4.3.3 S
ETTING THE TEMPERATURE COMPENSATION
TC).
Reference
temperature, Tref
The reference temperature (Tref) can be switched between 20 °C and 25 °C.
It appears on the display as Tref20 or Tref25. To switch over the reference
temperature, see section 4.4 C
ONFIGURATION.
16
ba75365e04 01/2011
handylab LF 11 Operation
AR
8
1
cm
1/
/
K
%
°
F
ARng
RCL
Cal
Lin
Tref20
LoBat
M
m
Sal
TDS
S
Auto
Store
Sal
mbar
%
mg/l
OUpH
mV/pH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
0
5
2
3
0
5
°
TP
S/
cm
C
Tref25
nLF
m
%
mg/l
S/
cm
S
AR
8
cm
1/
/
K
%
°
F
ARng
RCL
Cal
Lin
Tref20
LoBat
Sal
TDS
Auto
Store
Sal
mbar
OUpH
mV/pH
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
0
5
2
8
6
8
°
TP
C
Tref25
nLF
1
M
cm
4.2.2 Conductivity / Resistivity
Note
You can display measured values in the units μS/cm (conductivity) or MΩcm
(resistivity). This setting is described in section 4.4 C
Thus, you can carry out conductivity measurements or measurements of the
resistivity:
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the <M> key until ϰ appears on the status display. Depending
on the setting, one of the following display indicators appears on the
display:
Conductivity
μS/cm
ONFIGURATION.
Resistivity
MΩ⋅cm
ba75365e04 01/2011
4 Wait for a stable measured value.
17
Operation handylab LF 11
Tref25
/
K
cm
1/
°
F
%
8
mg/l
1
RCL
ARng
AR
LoBat
Cal
Tref20
Lin
m
S/
cm
M
TDS
S
Auto
Store
Sal
mbar
%
OUpH
mV/pH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
2
1
2
2
3
3
°
TP
Sal
C
nLF
4.2.3 Salinity
You can measure the salinity as follows:
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the <M> key until Sal appears on the status display. The sa-
linity value appears on the display.
4 Wait for a stable measured value.
4.2.4 TDS (Total dissolved solids)
You can measure the total dissolved solids as follows:
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the <M> key until TDS appears on the status display.
The value of the total dissolved solids appears in the upper display
line. The TDS factor appears in the lower display line.
18
4 Using <V> <W>, set the TDS factor (0.40 ... 1.00).
(The TDS factor has to be determined by a comparison measurement before.)
ba75365e04 01/2011
handylab LF 11 Operation
8
1
cm
1/
/
K
%
°
F
ARng
RCL
Cal
Lin
Tref20
LoBat
M
m
Sal
TDS
S
Auto
Store
Sal
mbar
%
mg/l
OUpH
mV/pH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
0
5
2
3
0
5
°
AR
TP
S/
cm
C
Tref25
nLF
5 Wait for a stable measured value.
AutoRead AR
(drift control)
The AutoRead function (drift control) checks the stability of the measurement
signal. The stability has a considerable effect on the reproducibility of the
measured value.
1 Select the required measuring mode with <M>.
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
3 Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
ba75365e04 01/2011
4 If necessary, start the next AutoRead measurement with <RUN/EN-
TER>.
5 To terminate AutoRead: Press the <AR> key.
Note
The current AutoRead measurement can be terminated at any time (accepting the current value) by pressing <RUN/ENTER>.
19
Operation handylab LF 11
4.3 Determining/setting up the cell constant [C]
Why determine/set
up the cell
constant?
Procedure The cell constant is determined in the control standard, 0.01 mol/l KCl.
Aging slightly changes the characteristics of the cell, e. g. by coatings. As a
result, an inexact measured value is displayed. The original characteristics of
the cell can often be restored by cleaning the cell. Calibration determines the
current cell constant and stores it in the instrument.
Thus, you should calibrate at regular intervals (we recommend: every 6
months).
You can determine the actual cell constant of the conductivity measuring cell
by calibrating with the control standard in the following ranges:
z 0.450 ... 0.500 cm
z 0.800 ... 1.200 cm
-1
-1
Besides, you can set the cell constant manually in the following ranges:
z 0.090 ... 0.110 cm
z 0.250 ... 2.500 cm
-1
-1
The fixed cell constant, 0.010 cm-1 can also be selected. It is not necessary
to calibrate or adjust it.
Cell constants outside the above mentioned ranges cannot be calibrated.
Calibration
evaluation
After the calibration, the measuring instrument automatically evaluates the
current status of the calibration. The evaluation appears on the display.
Display Cell constant [cm
0.450 ... 0.500 cm
0.800 ... 1.200 cm
-1
]
-1
-1
outside the ranges
E3
Eliminate the error according to
chapter 6 W
HAT TO DO IF...
0.450 ... 0.500 cm
or
0.800 ... 1.200 cm
-1
-1
20
ba75365e04 01/2011
handylab LF 11 Operation
OUpH
L
F
Sal
Store
RCL
AR
Auto
AutoCal DIN
AutoCal TEC
LoBat
Cal
ARng
Tref25
Tref20
Lin
nLF
Sal
%
mg/l
mV/pH
cm
°
°
TP
m
S/
cm
cm
1/
F
C
%
/
K
M
TDS
8
1
S
mbar
Time
Baud
Day.Month No.
Ident
Year
L
CL
E
A
L
C
S
1
LoBat
Lin
nLF
Tref20
RCL
ARng
AR
°
°
TP
F
C
%
/
K
M
%
mg/l
mV/pH
m
S/
cm
Sal
TDS
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
5
0 7
4
Cal
cm
1/
Tref25
4.3.1 Determining the cell constant (calibrating in the control standard)
Note
This method of automatically determining the cell constant by calibration with
the 0.01 mol/l KCL standard solution can only be used for measuring cells
with cell constants in the range 0.450 ... 0.500 cm
This is how you can determine the cell constant:
1 Press the <CAL> key until CELL appears on the display.
-1
or 0.800 ... 1.200 cm-1.
2 Press the <RUN/ENTER> key.
3 Press the <CAL> key repeatedly, until the calibrated cell con-
stant appears on the display: CAL appears on the display.
4 The displayed value is the current, calibrated cell constant. You
can:
– accept this setting for measuring with <M> or
– continue with step 5 and start a new calibration.
5 Immerse the measuring cell in the control standard solution,
0.01 mol/KCl.
ba75365e04 01/2011
21
Operation handylab LF 11
A
L
C
1
LoBat
Lin
nLF
Tref20
RCL
ARng
°
°
TP
F
C
%
/
K
M
%
mg/l
mV/pH
m
S/
cm
Sal
TDS
S
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
6
0 7
4
Cal
cm
1/
Tref25
AR
6 Press the <RUN/ENTER> key.
– If no temperature sensor is connected, enter the current
temperature of the solution with <V> <W>
and confirm with <RUN/ENTER>.
– If a temperature sensor is connected, the AR measurement
to determine the cell constant starts.
The AR display indicator flashes until a stable signal is
reached. The cell constant determined is displayed. The measuring instrument automatically stores the cell constant.
Note
If the error message E3 appears, refer to chapter 6 W
HAT TO DO IF...
22
ba75365e04 01/2011
handylab LF 11 Operation
OUpH
L
F
Sal
Store
RCL
AR
Auto
AutoCal DIN
AutoCal TEC
LoBat
Cal
ARng
Tref25
Tref20
Lin
nLF
Sal
%
mg/l
mV/pH
cm
°
°
TP
m
S/
cm
cm
1/
F
C
%
/
K
M
TDS
8
1
S
mbar
Time
Baud
Day.Month No.
Ident
Year
L
CL
E
Cal
1
LoBat
Lin
Tref20
RCL
AR
°
°
TP
F
C
%
/
K
M
%
mg/l
mV/pH
m
Sal
TDS
S
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
8
0 7
2
2
8
4
cm
1/
S/
cm
Tref25
nLF
ARng
Cal
1
LoBat
Lin
Tref20
RCL
AR
°
°
TP
F
C
%
/
K
M
%
mg/l
mV/pH
m
Sal
TDS
S
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
4
0 1
6
8
0
6
cm
1/
S/
cm
Tref25
nLF
ARng
4.3.2 Setting the cell constant manually
Note
The cell constant to be set must either be taken from the operating manual of
the measuring cell or is printed on the measuring cell.
You can set the cell constant manually as follows:
Range
0.250 ... 2.500 cm
-1
1 Press the <CAL> key repeatedly until CELL appears on the
display.
2 Press the <RUN/ENTER> key.
3 Press the <CAL> repeatedly until the adjustable cell constant,
e.g. 0.278 cm
-1
appears.
ba75365e04 01/2011
4 Set the cell constant to be used with <V> <W> , e.g.
0.614 cm
-1
.
23
Operation handylab LF 11
OUpH
L
F
Sal
Store
RCL
AR
Auto
AutoCal DIN
AutoCal TEC
LoBat
Cal
ARng
Tref25
Tref20
Lin
nLF
Sal
%
mg/l
mV/pH
cm
°
°
TP
m
S/
cm
cm
1/
F
C
%
/
K
M
TDS
8
1
S
mbar
Time
Baud
Day.Month No.
Ident
Year
L
CL
E
Cal
1
LoBat
Lin
Tref20
RCL
AR
°
°
TP
F
C
%
/
K
M
%
mg/l
mV/pH
m
Sal
TDS
S
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
0
00
1
2
5
9
cm
1/
S/
cm
Tref25
nLF
ARng
Range
0.090 ... 0.110 cm
5 To return to the measuring mode: Press the <M> key.
From now on, the cell constant 0.614 cm
-1
1 Press the <CAL> key repeatedly until CELL appears on the
display.
2 Press the <RUN/ENTER> key.
3 Press the <CAL> key repeatedly until a cell constant in the
range 0.090 ... 0.110 cm
-1
appears on the display.
-1
will be used.
24
4 Set the cell constant to be used with <V> <W> , e.g.
0.105 cm
5 To return to the measuring mode: Press the <M> key. Now this
setting is accepted for measuring.
-1
.
ba75365e04 01/2011
handylab LF 11 Operation
OUpH
L
F
Sal
Store
RCL
AR
Auto
AutoCal DIN
AutoCal TEC
LoBat
Cal
ARng
Tref25
Tref20
Lin
nLF
Sal
%
mg/l
mV/pH
cm
°
°
TP
m
S/
cm
cm
1/
F
C
%
/
K
M
TDS
8
1
S
mbar
Time
Baud
Day.Month No.
Ident
Year
L
CL
E
Cal
1
LoBat
Lin
Tref20
RCL
AR
°
°
TP
F
C
%
/
K
M
%
mg/l
mV/pH
m
Sal
TDS
S
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
0
0 1
0
2
5
9
cm
1/
S/
cm
Tref25
nLF
ARng
Setting the fixed
cell constant
0.010 cm
You can set the fixed value 0.010 cm-1 for the cell constant as follows:
-1
1 Press the <CAL> key repeatedly until CELL appears on the display.
2 Press the <RUN/ENTER> key.
3 Press the <CAL> key repeatedly until the cell constant
0.010 cm
-1
appears on the display.
ba75365e04 01/2011
4 To return to the measuring mode: Press the <M> key.
From now on, the cell constant 0.010 cm
-1
will be used.
25
Operation handylab LF 11
4.3.3 Setting the temperature compensation TC
The calculation of the temperature compensation is based on the preset reference temperature, Tref 20 or Tref 25 (see section 4.4 C
ONFIGURATION).
You can select one of the following temperature compensation methods:
z Nonlinear temperature compensation (nLF)
according to EN 27 888
z Linear temperature compensation (Lin)
with selectable coefficients of 0.001 ... 3.000 %
/K
z No temperature compensation (- - - -)
Note
ips Select the following temperature compensations given in the table according
to the respective test sample:
Application tips
Test sample Temperature
compensation (TC)
Natural water
(ground water, surface
water and drinking water)
nLF
according to DIN 38404
EN 27 888
Ultrapure water nLF
according to DIN 38404
EN 27 888
Other aqueous solutions Set linear temperature coeffi-
cient
0.001 ... 3.000 %/K
Salinity (seawater) Automatically nLF according to
IOT
Display
indicator
Sal,
26
ba75365e04 01/2011
handylab LF 11 Operation
OUpH
L
F
C
E
Store
RCL
AR
Auto
AutoCal DIN
AutoCal TEC
LoBat
Cal
ARng
Tref25
Tref20
Lin
nLF
Sal
%
mg/l
mV/pH
cm
°
°
TP
m
S/
cm
cm
1/
F
C
%
/
K
M
TDS
Sal
8
1
S
mbar
Time
Baud
Day.Month No.
Ident
Year
c
t
mg/l
AR
Store
O Sal
TDS
°
C
TP
/
K
cm
1/
°
F
%
8
1
RCL
LoBat
Cal
Tref20
Lin
m
M
S
Auto
Sal
mbar
%
UpH
mV/pH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
F
L
n
8
4
6
nLF
Tref25
ARng
S/
cm
Selecting the
nonlinear
temperature
compensation
You can select the nonlinear temperature compensation as follows:
1 Press the <CAL> key repeatedly until tc appears on the dis-
play.
2 Press the <RUN/ENTER> key.
3 Press the <CAL> key repeatedly until nLF appears on the dis-
play.
ba75365e04 01/2011
4 To return to the measuring mode: Press the <M> key. From
now on, nLF will be used for the temperature compensation.
27
Operation handylab LF 11
OUpH
L
F
C
E
Store
RCL
AR
Auto
AutoCal DIN
AutoCal TEC
LoBat
Cal
ARng
Tref25
Tref20
Lin
nLF
Sal
%
mg/l
mV/pH
cm
°
°
TP
m
S/
cm
cm
1/
F
C
%
/
K
M
TDS
Sal
8
1
S
mbar
Time
Baud
Day.Month No.
Ident
Year
c
t
S
nLF
TP
C
°
F
cm
1/
Cal
LoBat
Tref20
RCL
AR
°
M
%
mg/l
mV/pH
m
Sal
TDS
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
0
20
0
2
4
2
S/
cm
Tref25
ARng
%
/
K
Lin
1
S
nLF
TP
C
°
F
cm
1/
Cal
LoBat
Tref20
RCL
AR
°
M
%
mg/l
mV/pH
m
Sal
TDS
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
0
18
8
2
4
2
S/
cm
Tref25
ARng
%
/
K
Lin
1
Selecting the
linear
temperature
compensation
You can select the linear temperature compensation as follows:
1 Press the <CAL> key repeatedly until tc appears on the display.
2 Press the <RUN/ENTER> key.
3 Press the <CAL> key repeatedly until the adjustable linear tempera-
ture coefficient appears on the display.
28
4 Set the temperature coefficient with <V> <W> , e.g. 1.880 %/K.
5 To return to the measuring mode: Press the <M> key. From now on,
the adjusted linear temperature coefficient will be used for the temperature compensation.
ba75365e04 01/2011
handylab LF 11 Operation
OUpH
L
F
C
E
Store
RCL
AR
Auto
AutoCal DIN
AutoCal TEC
LoBat
Cal
ARng
Tref25
Tref20
Lin
nLF
Sal
%
mg/l
mV/pH
cm
°
°
TP
m
S/
cm
cm
1/
F
C
%
/
K
M
TDS
Sal
8
1
S
mbar
Time
Baud
Day.Month No.
Ident
Year
c
t
nLF
Cal
Tref20
Tref25
Lin
TP
C
°
%
/
K
S
F
cm
1/
LoBat
RCL
AR
°
M
%
mg/l
mV/pH
m
Sal
TDS
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
-
--
-
2
4
2
S/
cm
ARng
1
Switching the
temperature
compensation off
You can switch off the temperature compensation as follows:
1 Press the <CAL> key repeatedly until tc appears on the display.
2 Press the <RUN/ENTER> key.
3 Press the <CAL> key repeatedly until the following display appears.
ba75365e04 01/2011
4 The temperature compensation is switched off.
5 To return to the measuring mode: Press the <M> key. From now on,
the instrument will measure without temperature compensation.
29
Operation handylab LF 11
RCL
AR
ARng
Sal
/
K
%
TP
C
°
°
F
cm
1/
M
cm
mbar
S
E
Y
SalO
Store
1
S
m
%
mg/l
S/
cm
mV/pH
Baud
4
Day.Month No.
Time
Auto
LoBat
nLF
Cal
Lin
Tref20
TDS
UpH
AutoCal DIN
AutoCal TEC
Ident
Year
5
2
t
Tref25
4.4 Configuration
You can adapt the measuring instrument to your individual requirements. To
do this, the following parameters can be changed (the status on delivery is
marked in bold):
Reference temperature – 25 °C (TREF25)
– 20 °C (TREF20)
Reference
temperature
Display of the measured value as
conductivity or resistivity
Note
You can leave the configuration menu at any time with <M> . The parameters
that have already been changed are stored.
1 Switch off the measuring instrument.
2 Press the <M> key and hold it down.
3 Press the <ON/OFF> key.
The display test appears briefly on the display. t25 appears on the
display.
S/cm or MΩ
30
4 Using <V> <W>, switch between t25 and t20.
5 Confirm with <RUN/ENTER>. Cond appears on the display.
ba75365e04 01/2011
handylab LF 11 Operation
RCL
AR
Store
Sal
/
K
TP
%
C
°
°
F
cm
1/
nLF
Lin
Tref25
LoBat
Cal
Tref20
Baud
No.
Ident
cm
m
M
mbar
ARng
Auto
AutoCal DIN
AutoCal TEC
1
S
5
2
t
SalO
%
mg/l
mV/pH
Day.Month
Time
TDS
UpH
Year
d
n
o
C
cm
S/
Display of the
measured value as
conductivity /
resistivity
6 Using <V> <W>, switch between S/cm and MΩcm.
7 Confirm with <RUN/ENTER>.
The measuring instrument automatically switches to the measuring
mode.
ba75365e04 01/2011
31
Operation handylab LF 11
ARng
Y
SalO
Sal
/
K
%
TP
C
°
°
F
Store
cm
1/
1
S
M
m
%
mg/l
cm
S/
cm
mV/pH
mbar
Baud
4
Day.Month No.
Time
Auto
LoBat
Tref25
nLF
RCL
AR
Cal
Lin
Tref20
TDS
UpH
AutoCal DIN
AutoCal TEC
Ident
Year
o
n
I
n
I
4.5 Reset
Measurement
parameters
Resetting the
measuring
parameters
The following measured parameters (ϰ InI) are reset to the default condition:
Measuring mode
Cell constant 0.475 cm-1 (calibrated)
Temperature compensation nLF
Reference temperature
Temperature coefficient of the linear temperature compensation
TDS factor 1.00
Note
The calibration data gets lost when the measuring parameters are reset.
Recalibrate after performing a reset.
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <CAL> key.
ϰ
0.475 cm
2.000 %/K
-1
(set up)
32
3 Using <V> <W>, switch between no and YES.
YES: Resetting the measuring parameters
no: Retaining settings.
4 Confirm with <RUN/ENTER>.
The measuring instrument automatically switches to the measuring
mode.
ba75365e04 01/2011
handylab LF 11 Maintenance, cleaning, disposal
1
2
5 Maintenance, cleaning, disposal
5.1 Maintenance
The measuring instrument is almost maintenance-free.
The only maintenance task is replacing the batteries.
LoBat indicates that the batteries should be changed. The batteries are then
largely depleted.
Replacing the
batteries
1 Open the housing after the instrument has been switched off:
– Undo the four screws on the underside of the instrument
– Pull down the lower cover (1).
ba75365e04 01/2011
2 If necessary, take the four depleted batteries (2) out of the bat-
tery compartment.
3 Place four new batteries (type Mignon AA) in the battery com-
partment.
4 Close the lower cover (1).
Caution
Make sure that the poles of the batteries are the right way round.
The
± signs on the batteries must correspond to the ± signs in the battery
compartment.
Only use leakproof alkaline manganese batteries.
33
Maintenance, cleaning, disposal handylab LF 11
Note
For the maintenance of the measuring cells, follow the corresponding operating manual.
5.2 Cleaning
Occasionally wipe the outside of the measuring instrument with a damp, lintfree cloth. Disinfect the housing with isopropanol as required.
Caution
The housing is made of a synthetic material (ABS). Thus, avoid contact with
acetone and similar detergents that contain solvents. Remove any splashes
immediately.
5.3 Disposal
Packing This measuring instrument is sent out in a protective transport packing.
We recommend: Keep the packing material. The original packing protects the
instrument against damage during transport.
Batteries This note refers to the battery regulation that applies in the Federal Republic
of Germany. We would ask end-consumers in other countries to follow their
local statutory provisions.
Note
This instrument contains batteries. Batteries that have been removed must
only be disposed of at the recycling facility set up for this purpose or via the
retail outlet.
It is illegal to dispose of them in household refuse.
Measuring
instrument
Dispose of the measuring instrument as electronic waste at an appropriate
collection point. It is illegal to dispose of the instrument in household refuse.
34
ba75365e04 01/2011
handylab LF 11 What to do if...
6 What to do if...
LoBat display
Instrument does
not react to key-
stroke
Cause Remedy
– Batteries almost empty – Replace batteries
(see section 5.1 M
Cause Remedy
– Operating condition
undefined or EMC load
unallowed
– Processor reset:
Press the <CAL> and
<ON/OFF> keys at the same
time and release them again.
The software version is
displayed.
AINTENANCE)
Error message OFL
Error message E3
Display to
Cause Remedy
The measured value lies outside
the measuring range
– Measuring cell not connected – Connect measuring cell
– Cable broken – Replace measuring cell
Cause Remedy
– Measuring cell contaminated – Clean cell and
replace it if necessary
– Unsuitable calibration
– Check calibration solutions
solution
Cause Remedy
– Time-out of the interface – Check the instrument that is
connected
ba75365e04 01/2011
35
What to do if... handylab LF 11
36
ba75365e04 01/2011
handylab LF 11 Lists
7Lists
This chapter provides additional information and orientation aids.
Abbreviations The list of abbreviations explains the indicators and the abbreviations that ap-
pear on the display and in the manual.
Specialist terms The glossary briefly explains the meaning of the specialist terms. However,
terms that should already be familiar to the target group are not described
here.
Index The index will help you to find the topics that you are looking for.
ba75365e04 01/2011
37
Lists handylab LF 11
Abbreviations
Conductivity value (international γ)
AR AutoRead (drift control)
ARng Automatic range switching
Measuring instrument measures with highest resolution
-1
C Cell constant [cm
] (internat. k)
°C Temperature unit, degrees Celsius
Cal Calibration
InI Initialization
Resets individual basic functions to the status they
had on delivery
Lin Linear temperature compensation
LoBat Batteries almost empty(Low Battery)
nLF Nonlinear temperature compensation
OFL Display range exceeded (Overflow)
SELV Safety Extra Low Voltage
TC Temperature coefficient (internat. α)
TDS Total Dissolved Solids
TP Temperature measurement active (Temperature
Probe)
20/T20 Reference temperature of 20 °C
T
Ref
25/T25 Reference temperature of 25 °C
T
Ref
38
ba75365e04 01/2011
handylab LF 11 Lists
Glossary
Adjusting To manipulate a measuring system so that the relevant value (e. g. the
displayed value) differs as little as possible from the correct value or
a value that is regarded as correct, or that the difference remains within the tolerance.
AutoRange Name of the automatic selection of the measuring range.
AutoRead Name for a function to check the stability of the measured value.
Calibration Comparing the value from a measuring system (e. g. the displayed
value) to the correct value or a value that is regarded as correct. Often, this expression is also used when the measuring system is adjusted at the same time (see adjusting).
Cell constant, k Characteristic quantity of a conductivity measuring cell, depending on
the geometry.
Conductivity Short form of the expression, specific electrical conductivity. It is a
measured value of the ability of a substance to conduct an electric current. In water analysis, the electrical conductivity is a dimension for the
ionized substances in a solution.
Conductometry Name of the conductivity measuring technique.
Measured parameter The measured parameter is the physical dimension determined by
measuring, e. g. pH, conductivity or D. O. concentration.
Measured value The measured value is the special value of a measured parameter to
be determined. It is given as a combination of the numerical value and
unit (e. g. 3 m; 0.5 s; 5.2 A; 373.15 K).
Measuring system The measuring system comprises all the devices used for measuring,
e. g. measuring instrument and probe. In addition, there is the cable
and possibly an amplifier, terminal strip and armature.
Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol-
vent.
Reference
temperature
Fixed temperature value to compare temperature-dependent measured values. For conductivity measurements, the measured value is
converted to a conductivity value at a reference temperature of 20 °C
or 25 °C.
Reset Restoring the original condition of all settings of a measuring system.
Resistance Short name for the specific electrolytic resistance. It corresponds to
the reciprocal value of the electrical conductivity.
Resolution Smallest difference between two measured values that can be dis-
ba75365e04 01/2011
played by a measuring instrument.
Slope The slope of a linear calibration function.
39
Lists handylab LF 11
Standard solution The standard solution is a solution where the measured value is
known by definition. It is used to calibrate a measuring system.
TDS Total dissolved solids
TDS factor In conductometric measurements, the measuring instrument calcu-
lates the total dissolved solids (TDS) from the electric conductivity of
the test sample. For the calculation, a simple multiplication factor between 0.4 and 1.0 suffices. The exact factor depends on the quality of
the water to be examined and has to be determined for each water
type.
Temperature
Value of the slope of a linear temperature function.
coefficient
Temperature
compensation
Name of a function that considers the temperature influence on the
measurement and converts it accordingly. Depending on the measured parameter to be determined, the temperature compensation
functions in different ways. For conductometric measurements, the
measured value is converted to a defined reference temperature. For
potentiometric measurements, the slope value is adjusted to the temperature of the test sample but the measured value is not converted.
Temperature function Name of a mathematical function expressing the temperature behav-
ior of a test sample, a probe or part of a probe.
Test sample Designation of the sample ready to be measured. Normally, a test
sample is made by processing the original sample. The test sample
and original sample are identical if the test sample was not processed.
40
ba75365e04 01/2011
handylab LF 11 Index
Index
A
Authorized use 11
AutoRead 19
C
Calibration 20
Calibration evaluation 20
Cell constant 20
determine 21
set manually 23
Conductivity 17
D
Default condition 32
Display 7
Drift control 19
E
Energy saving feature 15
Error messages 35
S
Safety 11
Safety precautions 11
Salinity 18
Scope of delivery 13
T
TDS 18
TDS factor 18
Temperature compensation
26, 29
Temperature compensation
(conductivity)
Temperature sensor
Conductivity
Total dissolved solids 18
16
16
K
Keys 6
L
Linear
temperature compensati-
on
28
LoBat 35
N
Nonlinear
temperature compensati-
on
27
O
Operating safety 12
R
Reference temperature
(conductivity)
Replacing the batteries 33
Reset 32
16
ba75365e04 01/2011
41
Index handylab LF 11
42
ba75365e04 01/2011
SI Analytics GmbH
Postfach 2443
D-55014 Mainz
Hattenbergstr. 10
D-55122 Mainz
Telefon +49 (0) 61 31/66 5111
Telefax +49 (0) 61 31/66 5001
Email: support@
si-analytics.com
Internet: www.si-analytics.com
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