SCHOTT Instruments handylab LF 11 User manual

ba75365d04 01/2011
Operating manual
handylab LF 11
Conductivity Meter
AR
O
CAL
AR
S/
cm
Tref25
nLF
0
5
2
30
5
°
C
TP
M

handylab LF 11
2ba75365d04 01/2011
Accuracy when
going to press
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. Al-
so, we cannot guarantee that there are absolutely no errors in this man-
ual. Therefore, we are sure you will understand that we cannot accept
any legal claims resulting from the data, figures or descriptions.
Warranty We guarantee the instrument described for 3 years from the date of
purchase.
The instrument warranty covers manufacturing faults that are discov-
ered within the warranty period. The warranty does not cover compo-
nents 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 han-
dling or unauthorized opening of the instrument invalidates any warran-
ty 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.

handylab LF 11 List of contents
3
handylab LF 11 - List of contents
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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
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

List of contents handylab LF 11
4ba75365e04 01/2011

handylab LF 11 Overview
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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, re-
liability and measuring certainty for all applications.
The proven procedure for adjusting or setting the cell constant and the spe-
cial AutoRead function support you in your work with the handylab LF 11.
1Keypad
2Sample display
3Jack field
AR
O
CAL
AR
S/
cm
Tref25
nLF
0
5
2
30
5
°
C
TP
1
2
3
M

Overview handylab LF 11
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1.1 Keypad
Key functions
CAL
RUN/ENTER
AR
M
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>
M
CAL
AR
RUN/ENTER

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1.2 Display
1.3 Jack field
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.
1Conductivity measuring cell
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
88
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

Overview handylab LF 11
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1.4 Technical Data
Dimensions
and weight
Mechanical
structure
Electrical safety
Test certificates
Ambient
conditions
Measuring ranges
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
humidity
< 90 % of annual average
ϰ[µS/cm]
ϰ[mS/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-1 and
cell const. = 0.090 ... 0.110 cm-1)
0.0 ... 199.9
0 ... 1999
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

handylab LF 11 Overview
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Accuracy
(±1 digit)
Cell constant,
calibration
Cell constant,
selection
Reference
temperature
Temperature input
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
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
Manual [°C] -5 ... +100

Overview handylab LF 11
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Power supply
Applicable
guidelines and
norms
Batteries 4 x 1.5 V alkali-manganese batteries, Type
AA
Operational life Approx. 2500 operating hours (depending
on conductivity)
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
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.

handylab LF 11 Safety
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2Safety
This operating manual contains basic instructions that you must follow during
the commissioning, operation and maintenance of the conductivity measur-
ing instrument. Consequently, all responsible personnel must read this oper-
ating 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
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.
Further notes
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 TECHNICAL DATA must be
observed. Only the operation and running of the measuring instrument ac-
cording to the instructions given in this operating manual is authorized.
Any other use is considered to be unauthorized.

Safety handylab LF 11
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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 TECHNICAL
DATA).
It left the factory in a safe and secure technical condition.
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 oper-
ation.
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 TECHNICAL DATA.
If the instrument was transported from a cold environment to a warm environ-
ment, the formation of condensate can lead to the faulty functioning of the in-
strument. 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:
zhas been damaged in transport
zhas been stored under adverse conditions for a lengthy period of time
zis visibly damaged
zno longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the instrument.
Obligations of the
purchaser
The purchaser of the measuring instrument must ensure that the following
laws and guidelines are observed when using dangerous substances:
zEEC directives for protective labor legislation
zNational protective labor legislation
zSafety regulations
zSafety datasheets of the chemical manufacturers.

handylab LF 11 Commissioning
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3 Commissioning
3.1 Scope of delivery
zHandheld meter, handylab LF 11
zOperating manual and short operating manual
z4 batteries, 1.5 V Mignon type AA (in the instrument)

Commissioning handylab LF 11
14 ba75365e04 01/2011

handylab LF 11 Operation
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4 Operation
4.1 Switching on the measuring instrument
Note
The measuring instrument has an energy saving feature to avoid unneces-
sary battery depletion. The energy saving feature switches the measuring in-
strument off if no key has been pressed for an hour. The energy saving
feature is not active when the AutoStore function is active.
1Connect 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 com-
pensation that was set up appear for approx. one second one after
the other.
The measuring instrument then automatically switches to the mea-
suring mode that was last selected.

Operation handylab LF 11
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4.2 Measuring
4.2.1 General information
Preparatory
activities
Perform the following preparatory activities when you want to measure:
Temperature
sensor
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.
Temperature
compensation
The instrument has a nonlinear temperature compensation that can be
switched off (see section 4.3.3 SETTING 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 CONFIGURATION.
1Connect 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.
3Select the measuring mode with <M>.

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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 CONFIGURATION.
Thus, you can carry out conductivity measurements or measurements of the
resistivity:
Conductivity
μS/cm
Resistivity
MΩ⋅cm
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3Press the <M> key until ϰappears on the status display. Depending
on the setting, one of the following display indicators appears on the
display:
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
30
5
°
TP
S/
cm
C
Tref25
nLF
4Wait for a stable measured value.
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
86
8
°
TP
C
Tref25
nLF
1
M
cm

Operation handylab LF 11
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4.2.3 Salinity
You can measure the salinity as follows:
4.2.4 TDS (Total dissolved solids)
You can measure the total dissolved solids as follows:
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3Press the <M> key until Sal appears on the status display. The sa-
linity value appears on the display.
4Wait for a stable measured value.
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
23
3
°
TP
Sal
C
nLF
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3Press 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.
4Using <V> <W>, set the TDS factor (0.40 ... 1.00).
(The TDS factor has to be determined by a comparison measure-
ment before.)

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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.
Note
The current AutoRead measurement can be terminated at any time (accept-
ing the current value) by pressing <RUN/ENTER>.
5Wait for a stable measured value.
1Select the required measuring mode with <M>.
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
3Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
4If necessary, start the next AutoRead measurement with <RUN/EN-
TER>.
5 To terminate AutoRead: Press the <AR> key.
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
30
5
°
AR
TP
S/cm
C
Tref25
nLF

Operation handylab LF 11
20 ba75365e04 01/2011
4.3 Determining/setting up the cell constant [C]
Why determine/set
up the cell
constant?
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).
Procedure The cell constant is determined in the control standard, 0.01 mol/l KCl.
You can determine the actual cell constant of the conductivity measuring cell
by calibrating with the control standard in the following ranges:
z0.450 ... 0.500 cm-1
z0.800 ... 1.200 cm-1
Besides, you can set the cell constant manually in the following ranges:
z0.090 ... 0.110 cm-1
z0.250 ... 2.500 cm-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-1]
0.450 ... 0.500 cm-1
0.800 ... 1.200 cm-1
E3
Eliminate the error according to
chapter 6 WHAT TO DO IF...
outside the ranges
0.450 ... 0.500 cm-1
or
0.800 ... 1.200 cm-1