SCHOTT handylab LF 11 User manual

ba75365e01 02/2003
ba75365e
handylab LF 11
Operating manual
Conductivity measuring instrument
AR
O
CAL
c
AR
S/
cm
Tref25
nLF
0
5
2
30
5
°
C
TP

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 ©Mainz, Schott-Geräte GmbH, 2002
Reproduction in whole - or even in part - is prohibited without the ex-
press written permission of Schott-Geräte GmbH, Mainz.
Printed in Germany.

handylab LF 11 List of contents
3
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 / Specific resistance . . . . . . . . . . . 17
4.2.3 Salinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.4 TDS (Total dissolved solids) . . . . . . . . . . . . . . . 18
4.3 Determining/setting up the cell constant [C] . . . . . . . . . . 21
4.3.1 Determining the cell constant (calibrating in the
control standard) . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.2 Setting the cell constant manually . . . . . . . . . . . 24
4.3.3 Setting the temperature compensation TC . . . . 28
4.4 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.5 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5 Maintenance, cleaning, disposal. . . . . . . . . . . . . . . . . 35
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

List of contents handylab LF 11
4

handylab LF 11 Overview
5
1Overview
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 com-
fort, 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.
1Keypad
2Sample display
3Jack field
AR
O
CAL
c
AR
S/
cm
Tref25
nLF
0
5
2
30
5
°
C
TP
1
2
3

Overview handylab LF 11
6
1.1 Keypad
Key functions
c
CAL
RUN/ENTER
AR
Select the measuring mode <S
SS
S>:
–Conductivity/Specific resistance
–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
<
 >
Decrease values, scroll
<
 >
Confirm entries, start AutoRead
<RUN/ENTER>
c
CAL
AR
RUN/ENTER

handylab LF 11 Overview
7
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 SCHOTT 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
8
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
GS, cETLus, CE
Storage - 25 °C ... + 65 °C
Operation -10 °C ... + 55 °C
Relative atmospheric
humidity
< 90 % of annual average
[µS/cm]
[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
9
Accuracy
(±1 digit)
Cell constant,
calibration
Cell constant,
selection
Reference
temperature
Temperature input
,
Specific resistance
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
10
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 EEC guideline 89/336/EWG
EN 61326-1:1997
EN 61000-3-2:1995 + pr A14:2000
EN 61000-3-3:1995
FCC Class A
Instrument safety EEC guideline 73/23/EWG
EN 61010-1 A2:1995
Climatic class VDI/VDE 3540
Type of protection EN 60529:1991

handylab LF 11 Safety
11
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the conduc-
tivity 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 vi-
cinity of the measuring system.
Target group The measuring instrument was developed for work in the field and in
the laboratory.
We assume that, as a result of their professional training and experi-
ence, 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 envi-
ronment.
Further notes
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating manu-
als.
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 in-
strument according to the instructions given in this operating manual is
authorized.
Any other use is considered to be unauthorized.

Safety handylab LF 11
12
2.2 General safety instructions
This instrument is built and inspected according to the relevant guide-
lines 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 operating
safety The smooth functioning and operational safety of the measuring instru- ment can only be guaranteed if the generally applicable safety mea-
sures and the specific safety instructions in this operating manual are
followed during operation.
The smooth functioning and operational safety of the measuring instru-
ment 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
environment, the formation of condensate can lead to the faulty func-
tioning 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:
lhas been damaged in transport
lhas been stored under adverse conditions for a lengthy period of
time
lis visibly damaged
lno 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 fol- lowing laws and guidelines are observed when using dangerous sub-
stances:
lEEC directives for protective labor legislation
lNational protective labor legislation
lSafety regulations
lSafety datasheets of the chemical manufacturers.

handylab LF 11 Commissioning
13
3 Commissioning
3.1 Scope of delivery
lHandheld meter, handylab LF 11
lOperating manual and short operating manual
l4 batteries, 1.5 V Mignon type AA (in the instrument)

Commissioning handylab LF 11
14

handylab LF 11 Operation
15
4 Operation
4.1 Switching on the measuring instrument
Note
The measuring instrument has an energy saving feature to avoid un-
necessary 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 ac-
tive.
1Connect a conductivity measuring cell to the measuring instru-
ment.
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.

Operation handylab LF 11
16
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 temper-
ature 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 measur-
ing 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 COMPENSA-
TION 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 in-
strument.
2 In conjunction with the measuring cell, check or calibrate the
measuring instument. How to calibrate is described in section
4.3.
3Select the measuring mode with <S
SS
S>.

handylab LF 11 Operation
17
4.2.2 Conductivity / Specific resistance
Note
You can display measured values in the units µS/cm (conductivity) or
MΩcm (specific resistance). This setting is described in section
4.4 CONFIGURATION.
Thus, you can carry out conductivity measurements or measurements
of the specific resistance:
Conductivity µS/cm
Specific resistance
MΩ⋅cm
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3Press the <S
SS
S>key until appears on the status display. De-
pending 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
18
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 <S
SS
S>key until Sal appears on the status display. The
salinity 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 <S
SS
S>key until TDS appears on the status display.
The value of the total dissolved solids appears in the upper dis-
play line. The TDS factor appears in the lower display line.

handylab LF 11 Operation
19
AutoRead AR
(drift control)
The AutoRead function (drift control) checks the stability of the mea-
surement signal. The stability has a considerable effect on the repro-
ducibility of the measured value.
4Using <  > <  >, set the TDS factor (0.40 ... 1.00).
(The TDS factor has to be determined by a comparison mea-
surement before.)
5Wait for a stable measured value.
1Select the required measuring mode with <S
SS
S>.
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/ENTER>.
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
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.