handylab LF 12
Operating manual
handylab LF 12
Tref2
nLF 5
53
25
M
CAL
0
0
S/cm
°C
TP
AR
STO
O
RCL
AR
Conductivity Meter
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handylab LF 12
Accuracy when
going to press
Warranty
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.
We guarantee the instrument described for 3 years from the date of
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
2
© 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.
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handylab LF 12
List of contents
handylab LF 12 - List of contents
1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
1.2
1.3
1.4
2
4.3
4.4
4.5
4.6
4.7
01/2011
Switching on the measuring instrument . . . . . . . . . . . . . . . . .
Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.2 Conductivity / Resistivity . . . . . . . . . . . . . . . . . . . . . . .
4.2.3 Salinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.4 TDS (Total dissolved solids) . . . . . . . . . . . . . . . . . . . .
Determining/setting up the cell constant [C] . . . . . . . . . . . . . .
4.3.1 Determining the cell constant
(calibrating in the control standard) . . . . . . . . . . . . . .
4.3.2 Setting the cell constant manually . . . . . . . . . . . . . . .
4.3.3 Setting the temperature compensation TC . . . . . . . . .
Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.2 Saving automatically . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.3 Outputting the data storage . . . . . . . . . . . . . . . . . . . .
4.4.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.1 Data transmission interval (Int 2) . . . . . . . . . . . . . . . .
4.5.2 Recorder (analog output) . . . . . . . . . . . . . . . . . . . . . .
4.5.3 PC/external printer (RS232 interface) . . . . . . . . . . . .
4.5.4 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
18
18
19
20
20
22
23
25
28
32
32
34
36
40
41
41
43
44
44
45
48
Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . . . . . 51
5.1
5.2
5.3
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Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1
4.2
5
Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1
3.2
4
6
7
7
8
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1
2.2
3
Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3
List of contents
4
handylab LF 12
6
What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7
Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
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handylab LF 12
Overview
1
Overview
The compact precision handheld meter handylab LF 12 enables you to carry
out conductivity measurements rapidly and reliably.
The handylab LF 12 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 12.
3
Tref2
nLF 5
53
25
M
C AL
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Keypad
2
Sample display
3
Jack field
0
S/cm
°C
2
TP
AR
STO
O
RCL
AR
1
0
1
5
Overview
handylab LF 12
1.1
Keypad
M
STO
CAL
RCL
AR
RUN/ENTER
Key functions
M
Select the measuring mode <M>:
– Conductivity/Resistivity
– Salinity
– Total dissolved solids (TDS)
STO
Save a measured value
<STO>
Switch measuring instrument on/off
<ON/OFF>
CAL
– Determine or set up the cell constant
– Select temperature compensation
<CAL>
RCL
AR
Display/transmit measured values
<RCL>
Activate/deactivate the AutoRead function
<AR>
Increase values, scroll
<V >
Decrease values, scroll
<W >
RUN/ENTER
6
Confirm entries, start AutoRead
<RUN/ENTER>
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handylab LF 12
Overview
1.2
Display
Status display
TDS UpH O
S
Sal
mV/pH
% mg/l
mS/cm
mbar M cm
1/ cm Sal
°F° % /K TP
Sensor symbol
1888
Baud
Time
Day.Month No.
Year
Ident
8 8 .8
Tref25 Tref20
LoBat nLF Lin Cal
1.3
AutoCal DIN
AutoCalTEC
Meas. value display
Function and
temperature display
C
Auto Store
ARng AR RCL
Jack field
3
2
1
1
Conductivity measuring cell
2
Plug-in power supply (optional)
3
Serial Interface RS 232 / analog output (recorder)
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.
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7
Overview
handylab LF 12
1.4
Dimensions
and weight
Technical Data
Length [mm]
172
Width [mm]
80
Height [mm]
37
Weight [kg]
Approx. 0.3
Type of protection
IP 66
Electrical safety
Protective class
III
Test certificates
cETLus, CE
Mechanical
structure
Ambient
conditions
Measuring ranges
Storage
- 25 °C ... + 65 °C
Operation
-10 °C ... + 55 °C
Relative atmospheric
humidity
< 90 % of annual average
ϰ [µS/cm]
ϰ [mS/cm]
8
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
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handylab LF 12
Accuracy
(±1 digit)
Overview
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
± 0.5
± 0.1
± 1
Operating temperature
0 °C ... 15 °C
5 °C ... 35 °C
35 °C ... 55 °C
Cell constant,
calibration
C [cm-1]
0.450 ... 0.500
0.800 ... 1.200
Cell constant,
selection
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
Reference
temperature
Temperature input
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9
Overview
Analog output
Serial interface
10
handylab LF 12
Automatic switchover when a recorder is connected.
Output signal
0 ... 1.999 V for range 0 ... 1999 digits
Accuracy
± 0.5 % of display value
Internal resistance
< 5 Ohm (curr
ent limited to max. 0.2 mA output current)
Automatic switchover when a PC or printer is connected.
Type
RS232, data output
Baud rate
Can be set to
1200, 2400, 4800, 9600 Baud
Data bits
8
Stop bit
2
Parity
None
Handshake
RTS/CTS + Xon/Xoff
Cable length
Max. 15 m
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handylab LF 12
Power supply
Applicable
guidelines and
norms
Overview
Batteries
4 x 1.5 V alkali-manganese batteries, Type
AA
Operational life
Approx. 2500 operating hours (depending
on conductivity)
Mains
FRIWO FW7555M/09, 15.1432.500-00
Friwo Part. No. 1883259
Input: 100 ... 240 V ~ / 50 ... 60 Hz / 400 mA
Output: 9 V = / 1.5 A
Connection max. overvoltage category II
Primary plugs contained in the scope of
delivery: Euro, US, UK and Australian.
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.
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11
Overview
12
handylab LF 12
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handylab LF 12
Safety
2
Safety
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 laboratory.
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 according to the instructions given in this operating manual is authorized.
Any other use is considered to be unauthorized.
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13
Safety
handylab LF 12
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 operating 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 TECHNICAL 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
z no 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:
z EEC directives for protective labor legislation
z National protective labor legislation
z Safety regulations
z Safety datasheets of the chemical manufacturers.
14
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handylab LF 12
Commissioning
3
Commissioning
3.1
Scope of delivery
z Handheld meter, handylab LF 12
z Operating manual and short operating manual
z 4 batteries, 1.5 V Mignon type AA (in the instrument)
3.2
Initial commissioning
Perform the following activities:
z Set the date and time
z Connect the plug-in power supply, optional.
Setting the date
and time
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1
Press the <M> key and hold it down.
2
Press the <ON/OFF> key.
The display test appears briefly on the display.
3
Press the <RUN/ENTER> key repeatedly until the date appears on the display.
4
Set the date of the current day with <V> <W>.
5
Confirm with <RUN/ENTER>.
The date (month) flashes in the display.
6
Set the current month with <V> <W>.
7
Confirm with <RUN/ENTER>.
The year appears on the display.
8
Set the current year with <V> <W>.
9
Confirm with <RUN/ENTER>.
The hours flash on the display.
10
Set the current time with <V> <W>.
11
Confirm with <RUN/ENTER>.
The minutes flash on the display.
12
Set the current time with <V> <W>.
13
Confirm with <RUN/ENTER>.
The instrument switches to the measuring mode.
15
Commissioning
Connecting the
plug-in power
supply (option)
handylab LF 12
You can either operate the measuring instrument with batteries or with the
plug-in power supply. The plug-in power supply supplies the measuring instrument with low voltage (12 V DC). This saves the batteries.
Caution
The line voltage at the operating site must lie within the input voltage range
of the original plug-in power supply (see
section 1.4 TECHNICAL DATA).
Caution
Use original plug-in power supplies only (see
section 1.4 TECHNICAL DATA).
2
3
1
1
Plug the jack (1) into the socket (2) of the measuring instrument.
2
Connect the original SI Analytics plug-in power supply (3) to an
easily accessible mains socket.
Note
You can also measure without the plug-in power supply.
16
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handylab LF 12
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.
The energy saving feature is also not active
z if the power is supplied by the plug-in power supply,
z if the communication cable and a PC with a running communication program are connected,
z if the recorder cable is connected,
z if the printer cable is connected (for external printers).
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17
Operation
Preparatory
activities
handylab LF 12
4.2
Measuring
4.2.1
General information
Perform the following preparatory activities when you want to measure:
1
Connect the conductivity measuring cell to the measuring instrument.
2
In conjunction with the measuring cell, check or calibrate the
measuring instument. How to calibrate is described in section
4.3.
3
Select the measuring mode with <M>.
Caution
When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result. The RS232 interface is not galvanically isolated.
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
Reference
temperature, Tref
18
The instrument has a nonlinear temperature compensation that can be
switched off (see section 4.3.3 SETTING THE TEMPERATURE COMPENSATION
TC).
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 4.6 CONFIGURATION.
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handylab LF 12
Operation
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 4.6 CONFIGURATION.
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
Conductivity
μS/cm
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:
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1530
Baud
Time
Day.Month No.
Year
Ident
8250
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
Resistivity
MΩ⋅cm
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1886
Baud
Time
Day.Month No.
Year
Ident
8250
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
4
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Wait for a stable measured value.
19
Operation
handylab LF 12
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
salinity value appears on the display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1323
Baud
Time
Day.Month No.
Year
Ident
8212
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
4
4.2.4
Wait for a stable measured value.
TDS (Total dissolved solids)
You can measure the total dissolved solids as follows:
20
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.
4
Using <V> <W>, set the TDS factor (0.40 ... 1.00).
(The TDS factor has to be determined by a comparison measurement before.)
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handylab LF 12
Operation
5
AutoRead AR
(drift control)
Wait for a stable measured value.
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.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1530
Baud
Time
Day.Month No.
Year
Ident
8250
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
4
If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
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>.
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21
Operation
handylab LF 12
4.3
Why determine/set
up the cell
constant?
Procedure
Determining/setting up the cell constant [C]
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).
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:
z 0.450 ... 0.500 cm-1
z 0.800 ... 1.200 cm-1
Besides, you can set the cell constant manually in the following ranges:
z 0.090 ... 0.110 cm-1
z 0.250 ... 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.
Printing the
calibration
record
The calibration protocol contains the calibration data of the current calibration.
You can transmit the calibration protocol to a printer via the serial interface
(see page 39).
Note
You can automatically print a calibration protocol after the calibration. To do
so, connect a printer to the interface according to section 4.5.3 before calibrating. After a valid calibration, the record is printed.
Sample printout:
CALIBRATION PROTOCOL
14.04.01
11:37
Device No.: 99990000
Calibration Conductivity
Cal time: 14.04.01 / 11:37
Cal interval: 180d
Cal Std.:
0.01 mol/l KCL
40.0 °C
Conduct./Tref25: 1413µS/cm
Cell Const : 0.478
1/cm
Probe :
+++
Calibration
evaluation
22
After the calibration, the measuring instrument automatically evaluates the
current status of the calibration. The evaluation appears on the display.
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handylab LF 12
Operation
Cell constant [cm-1]
Display
0.450 ... 0.500 cm-1
0.800 ... 1.200 cm-1
E3
Eliminate the error according to
chapter 6 WHAT TO DO IF...
4.3.1
outside the ranges
0.450 ... 0.500 cm-1
or
0.800 ... 1.200 cm-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-1 or 0.800 ... 1.200 cm-1.
This is how you can determine the cell constant:
1
Press the <CAL> key until CELL appears on the display.
TDS UpH O
S
18L F
Baud
Time
Day.Month No.
Year
Ident
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
CELL
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
ba75367e04
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2
Press the <RUN/ENTER> key.
3
Press the <CAL> key repeatedly, until the calibrated cell constant appears on the display: CAL appears on the display.
23
Operation
handylab LF 12
TDS UpH O
S
1C AL
Baud
Time
Day.Month No.
Year
Ident
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
0475
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
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.
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.
TDS UpH O
S
1C AL
Baud
Time
Day.Month No.
Year
Ident
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
0476
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
Note
If the error message E3 appears, refer to chapter 6 WHAT TO DO IF...
24
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handylab LF 12
Operation
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.
TDS UpH O
S
18L F
Baud
Time
Day.Month No.
Year
Ident
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
CELL
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
2
Press the <RUN/ENTER> key.
3
Press the <CAL> repeatedly until the adjustable cell constant,
e.g. 0.278 cm-1 appears.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1428
Baud
Time
Day.Month No.
Year
Ident
0278
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
4
Set the cell constant to be used with <V> <W> , e.g.
0.614 cm-1.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1680
Baud
Time
Day.Month No.
Year
Ident
06 14
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
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25
Operation
Range
0.090 ... 0.110 cm-1
handylab LF 12
5
To return to the measuring mode: Press the <M> key.
From now on, the cell constant 0.614 cm-1 will be used.
1
Press the <CAL> key repeatedly until CELL appears on the
display.
TDS UpH O
S
18L F
Baud
Time
Day.Month No.
Year
Ident
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
CELL
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
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.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1925
Baud
Time
Day.Month No.
Year
Ident
0100
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
26
4
Set the cell constant to be used with <V> <W> , e.g.
0.105 cm-1.
5
To return to the measuring mode: Press the <M> key. Now this
setting is accepted for measuring.
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handylab LF 12
Setting the fixed
cell constant
0.010 cm-1
Operation
You can set the fixed value 0.010 cm-1 for the cell constant as follows:
1
Press the <CAL> key repeatedly until CELL appears on the
display.
TDS UpH O
S
18L F
Baud
Time
Day.Month No.
Year
Ident
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
CELL
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
2
Press the <RUN/ENTER> key.
3
Press the <CAL> key repeatedly until the cell constant
0.010 cm -1 appears on the display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1925
Baud
Time
Day.Month No.
Year
Ident
0010
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
4
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To return to the measuring mode: Press the <M> key.
From now on, the cell constant 0.010 cm-1 will be used.
27
Operation
handylab LF 12
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 4.6 CONFIGURATION).
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 (- - - -)
ips
Application tips
28
Note
Select the following temperature compensations given in the table according
to the respective test sample:
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
coefficient
0.001 ... 3.000 %/K
Salinity (seawater)
Automatically nLF according to IOT
Display
indicator
Sal,
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handylab LF 12
Selecting the
noninear
temperature
comensation
Operation
You can select the nonlinear temperature compensation as follows:
1
Press the <CAL> key repeatedly until tc appears on the display.
TDS UpH O
S
18L F
Baud
Time
Day.Month No.
Year
Ident
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
CEtc
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
2
Press the <RUN/ENTER> key.
3
Press the <CAL> key repeatedly until nLF appears on the display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1684
Baud
Time
Day.Month No.
Year
Ident
8nL F
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
4
ba75367e04
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To return to the measuring mode: Press the <M> key. From
now on, nLF will be used for the temperature compensation.
29
Operation
Selecting the linar
temperature
compensation
handylab LF 12
You can select the linear temperature compensation as follows:
1
Press the <CAL> key repeatedly until tc appears on the display.
TDS UpH O
S
18L F
Baud
Time
Day.Month No.
Year
Ident
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
CEtc
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
2
Press the <RUN/ENTER> key.
3
Press the <CAL> key repeatedly until the adjustable linear
temperature coefficient appears on the display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1224
Baud
Time
Day.Month No.
Year
Ident
2000
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
4
Set the temperature coefficient with <V> <W> , e.g. 1.880 %/
K.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1224
Baud
Time
Day.Month No.
Year
Ident
1880
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
5
30
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.
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handylab LF 12
Switching the
temperature
compensation off
Operation
You can switch off the temperature compensation as follows:
1
Press the <CAL> key repeatedly until tc appears on the display.
TDS UpH O
S
18L F
Baud
Time
Day.Month No.
Year
Ident
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
CEtc
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
2
Press the <RUN/ENTER> key.
3
Press the <CAL> key repeatedly until the following display appears.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1224
Baud
Time
Day.Month No.
Year
Ident
----
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
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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.
31
Operation
handylab LF 12
4.4
Saving
The measuring instrument has an internal data memory. It can store up to
800 data records.
A complete data record consists of:
z Storage location
z Date/time
z Measured value
z Temperature
z Temperature measuring procedure
z ID number
You can transmit measured values (data records) to the data storage in two
ways:
z Save manually
z Switch on AutoStore (Int 1).
4.4.1
Saving manually
You can transmit a measured value to the data storage as follows:
1
Press the <STO> key.
The current number (location number No.) of the next free storage location appears under the current measured value on the
display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
155 3
Baud
Time
Day.Month No.
Year
Ident
0014
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
2
32
Confirm with <RUN/ENTER>.
The display switches to entering the ID number.
ba75367e04
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handylab LF 12
Operation
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
155 3
Baud
Time
Day.Month No.
Year
Ident
0011
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
Message StoFull
3
Using <V> <W>, enter the required ID number
(1 ... 999).
4
Confirm with <RUN/ENTER>.
The instrument changes to the measuring mode.
This message appears when all of the 800 storage locations are occupied.
You have the following options:
ba75367e04
01/2011
Saving the current measured value.
The oldest measured value (storage
location 1) will be overwritten by this
Press
<RUN/ENTER>.
Returning to the measuring mode without
saving
press any key
Outputting the data storage
see
section 4.4.3
Clearing the memory
see
section 4.4.4
33
Operation
handylab LF 12
4.4.2
Saving automatically
The save interval (Int 1) determines the chronological interval between automatic save processes.
After the fixed interval has expired, the current data record is transmitted to
the storage and to the interface.
Setting the save
interval
The default setting for the save interval (Int 1) is OFF.
By this, the AutoStore function is switched off.
To switch the function on, set an interval (5 s, 10 s, 30 s, 1 min, 5 min, 10 min,
15 min, 30 min, 60 min):
1
Press the <RUN/ENTER> key and hold it down.
2
Press the <STO> key. Int 1 appears on the display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1nt 1
Baud
Time
Day.Month No.
Year
Ident
8OFF
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
3
Set the required interval between the saving procedures with
<V> <W>.
4
Confirm with <RUN/ENTER>.
The number of free memory locations appears on the display.
5
As soon as all of the 800 storage locations are occupied,
AutoStore is terminated (Int 1 = OFF).
If there are not enough storage locations available for your
measurements:
– Output and backup the data storage (see page 36) and
– clear the memory (see page 40).
34
ba75367e04
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handylab LF 12
Operation
6
Confirm with <RUN/ENTER>.
The prompt for the ID number appears on the display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1999
Baud
Time
Day.Month No.
Year
Ident
Fr e1
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
7
Set the required ID number with <V> <W>.
8
Confirm with <RUN/ENTER>.
The instrument switches to the measuring mode and starts the
measuring and saving process.
AutoStore flashes on the display.
Note
The AutoStore function is interrupted if you start other functions, e.g. output
the data storage.
After the function is finished, the AutoStore function is continued. By this,
however, temporal gaps in the recording of the measured values will occur.
Switching off
AutoStore
Switch AutoStore off by:
z setting the save interval (Int 1) to OFF, or
z switching the measuring instrument off and then on again.
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35
Operation
handylab LF 12
4.4.3
Outputting the data storage
You can output the contents of the data storage:
z Stored data on the display
z Calibration data on the display
z Stored data on the serial interface
z Calibration protocol to the interface
Outputting stored
data on the display
1
Press the <RCL> key repeatedly until StO dISP appears on the
display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1ST O
Baud
Time
Day.Month No.
Year
Ident
dIsp
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
2
Press the <RUN/ENTER> key.
A measured value appears on the display.
The storage location of the data record is displayed for approx.
2 s, then the respective temperature appears.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
155 3
Baud
Time
Day.Month No.
Year
Ident
0250
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
You can perform the following activities:
36
Display further elements of the data record
(ID number, date, time, storage location)
Press
<RUN/ENTER>.
Advance one data record (storage location)
Press <V>
Go back one data record (storage location)
Press <W>
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handylab LF 12
Operation
Note
If you want to search for a certain element (e.g. date), proceed as follows:
Outputting stored
data to the
interface
1
Using <RUN/ENTER>, select the element (e.g. date).
2
Press <V> or <W> repeatedly until the required date appears
on the display.
After approx. 2 s the temperature of the displayed measured
value appears.
1
Press the <RCL> key repeatedly until Sto SEr appears on the
display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1St o
Baud
Time
Day.Month No.
Year
Ident
SER
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
2
Press the <RUN/ENTER> key.
The complete storage content is transmitted to the interface;
during the data transmission the numbers of the currently
transmitted storage locations run through. After the data transmission, the measuring instrument automatically switches to
the measuring mode.
Note
You can cancel the transmission with <M> or <RUN/ENTER>.
After the instrument number, the printout contains the complete storage contents in ascending order of the storage location numbers.
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37
Operation
handylab LF 12
Sample printout:
Device No.: 99990000
No.
1:
01.01.99
00:04
2.40 mS/cm
25
°C
Tman
nLF
Tref25 C = 0.475 1/cm
Ident : 1
No.
2:
10.01.99
10:09
2.40 mS/cm
25.3 °C
Tauto
nLF
Tref25 C = 0.475 1/cm
Ident : 1
No.
3:
12.01.99
01:48
2.40 mS/cm
21.6 °C
Tauto
nLF
Tref25 C = 0.475 1/cm
Ident : 1
...
Outputting the
calibration data
on the display
1
Press the <RCL> key repeatedly until CAL dISP appears on
the display.
ISE UpH
mol/L
mV/pH
% ppm
mg/L
S
1 0 C A L°F
Baud
Time
Day.Month No.
Year
LoBat
2
38
Ident
d i s p °C %
TP
AutoCal DIN Auto Store CalError TempError
AutoCal TEC ConCal
ARng AR
RCL
Press the <RUN/ENTER> key.
The cell constant on the display, but the CAL display only appears when the displayed value was determined by calibrating
the measuring cell.
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handylab LF 12
Outputting the
calibration
protocol on the
interface
Operation
3
Using <M> or <RUN/ENTER>, you can switch back to the
measuring mode.
1
Press the <RCL> key repeatedly until CAL appears on the display.
ISE UpH
mol/L
mV/pH
% ppm
mg/L
S
1 0 C A L°F
Baud
Time
Day.Month No.
Year
LoBat
2
Ident
d s e r °C %
TP
AutoCal DIN Auto Store CalError TempError
AutoCal TEC ConCal
ARng AR
RCL
Press the <RUN/ENTER> key.
The calibration protocol is transmitted to the interface.
After the data transmission, the measuring instrument automatically switches to the measuring mode.
Note
You will find a sample calibration protocol in PRINTING THE CALIBRATION RECORD, page 22).
ba75367e04
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39
Operation
handylab LF 12
4.4.4
Clearing the memory
With this function, you can delete stored data records. 800 storage locations
will then be available again.
Note
The Clear memory function only appears when there are data records stored
in the memory. Otherwise, the measuring instrument automatically switches
to the measuring mode.
Proceed as follows to clear all data records:
1
Switch off the measuring instrument.
2
Press the <STO> key and hold it down.
3
Press the <ON/OFF> key.
The display test appears briefly on the display.
Subsequently, Sto clr appears.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1St o
Baud
Time
Day.Month No.
Year
Ident
dc l r
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
4
Confirm the clearing process with <RUN/ENTER>.
Pressing any other key prevents the clearing, the data records
will remain stored.
Note
The calibration data remain stored and can be called up.
40
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handylab LF 12
Operation
4.5
Transmitting data
You have the following possibilities of transmitting data:
z One of the following options:
– With the AutoStore function (page 34), measured values are
periodically saved internally (save interval Int 1) and output on the
interface.
– With the Data transmission interval function (Int 2), measured values
are periodically output on the interface (see below).
z With the Output data storage function (page 36), calibration data or saved
measured values are output on the interface.
z Via the analog recorder output (page 43), measured values are output as
voltage values.
z With a communication kit (accessory), data can be transmitted bidirectionally (page 44).
Note
If you connect a recorder (analog output), the output on the digital interface
is switched off.
4.5.1
Data transmission interval (Int 2)
The interval to the data transmission (Int 2) determines the chronological interval between automatic data transmissions. After the selected interval expires, the current data record is transmitted to the interface.
Note
When the AutoStore function is active, the data transmission is performed according to the setting of the save interval (Int 1). Set the save interval (Int 1)
to OFF to activate the Data transmission interval (Int 2).
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41
Operation
Setting the
Data transmission
interval
handylab LF 12
The default setting for the interval is OFF.
To start the data transmission, set an interval (5 s, 10 s, 30 s, 1 min,
5 min, 10 min, 15 min, 30 min, 60 min):
1
Press the <RUN/ENTER> key and hold it down.
2
Press the <RCL> key. Int 2 appears on the display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1nt 2
Baud
Time
Day.Month No.
Year
Ident
8OFF
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
42
3
Set the required interval between the saving procedures with
<V> <W>.
4
Confirm with <RUN/ENTER>.
The measuring instrument automatically switches to the measuring mode.
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handylab LF 12
Operation
4.5.2
Recorder (analog output)
You can transmit data to a recorder via the analog output. Connect the analog output to the recorder via the Z 394 interface cable.
The data output automatically switches to Recorder output.
Socket
assignment
1
4
2
3
RS 232
REC
1 free
2 Plug coding
3 Ground
4 Analog output
(internal resistance < 5 Ohm)
Note
The analog output is activated automatically in the cable by connecting 2 and
3.
The signal range of the analog output depends on the measured variable and
the measuring range:
Conductivity/
Resistance
Salinity
TDS
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Measuring range
Voltage
Resolution
0.000 ... 1.999 µS/cm
0 ... 1999 mV
1 mV
0.00 ... 19.99 µS/cm
0 ... 1999 mV
1 mV
0.0 ... 199.9 µS/cm
0 ... 1999 mV
1 mV
0 ... 1999 µS/cm
0 ... 1999 mV
1 mV
0.00 ... 19.99 mS/cm
0 ... 1999 mV
1 mV
0.0 ... 199.9 mS/cm
0 ... 1999 mV
1 mV
0 ... 500 mS/cm
0 ... 500 mV
1 mV
Measuring range
Voltage
Resolution
0 ... 70.0
0 ... 700 mV
1 mV
Measuring range
Voltage
Resolution
0 ... 1999 mg/l
0 ... 1999 mV
1 mV
43
Operation
handylab LF 12
4.5.3
PC/external printer (RS232 interface)
Via the RS 232 interface, you can transmit the data to a PC or an external
printer.
Use the Z 395 (PC) or Z 391 (ext. printer) cable to connect the interface to
the instruments.
The data output automatically switches to the RS232 interface.
Caution
The RS232 interface is not galvanically isolated.
When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result.
Set up the following transmission data on the PC/printer:
Baud rate
selectable between: 1200, 2400, 4800, 9600
Handshake
RTS/CTS + Xon/Xoff
Parity
none
Data bits
8
Stop bits
1
Socket
assignment
1
4
2
3
1 CTS
2 RxD
3 Ground
4 TxD
RS 232
REC
4.5.4
Remote control
The handheld meter can be remotely controlled from a PC. This requires a
communication kit (communication cable + communication program) which is
available upon request. The instrument is then controlled via commands that
simulate keystrokes and request the current display contents.
Note
A more detailed description is provided within the scope of delivery of the
communication kit.
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Operation
4.6
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):
Baud rate
1200, 2400, 4800, 9600
Calibration interval (Int 3)
1 ... 180 ... 999 d
AutoRange ARng
On or off
Reference temperature
– 25 °C (TREF25)
– 20 °C (TREF20)
Display of the measured value
as conductivity or resistivity
S/cm or MΩ
Date/time
Any
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. The measuring
instrument then switches automatically to the setting of the
baud rate.
Baud rate
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1nt 2
Baud
Time
Day.Month No.
Year
Ident
4800
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
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4
Select the required Baud rate with <V> <W>.
5
Confirm with <RUN/ENTER>. Int 3 appears on the display.
45
Operation
handylab LF 12
Calibration interval
TDS UpH O
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
S
1nt 3
Baud
Time
Day.Month No.
Year
Ident
d180
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
AutoRange
(automatic
selection of the
measurement
range)
6
Set the required interval in days with <V> <W>.
7
Confirm with <RUN/ENTER>.
Arn appears on the display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1Ar n
Baud
Time
Day.Month No.
Year
Ident
4YES
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
Reference
temperature
8
Using <V> <W>, switch between no and YES.
YES: Switch on AutoRange.
no: Switch off AutoRange.
9
Confirm with <RUN/ENTER>.
t25 appears on the display.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1t 25
Baud
Time
Day.Month No.
Year
Ident
4YES
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
46
10
Using <V> <W>, switch between t25 and t20.
11
Confirm with <RUN/ENTER>. Cond appears on the display.
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Display of the
measured value as
conductivity /
resistivity
Operation
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbar M cm
1/ cm Sal
°F° % /K TP
1t 25
Baud
Time
Day.Month No.
Year
Ident
C ond
Tref25 Tref20
LoBat nLF Lin Cal
C
Auto Store
ARng AR RCL
AutoCal DIN
AutoCalTEC
12
Using <V> <W>, switch between S/cm and MΩcm.
13
Confirm with <RUN/ENTER>.
The date flashes on the display.
Date and time
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1Dis
Baud
Time
Day.Month No.
Year
Ident
0904
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR
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14
Set the date of the current day with <V> <W>.
15
Confirm with <RUN/ENTER>.
The date (month) flashes in the display.
16
Set the current month with <V> <W>.
17
Confirm with <RUN/ENTER>.
The year appears on the display.
18
Set the current year with <V> <W>.
19
Confirm with <RUN/ENTER>.
The hours flash on the display.
20
Set the current time with <V> <W>.
21
Confirm with <RUN/ENTER>.
The minutes flash on the display.
22
Set the current time with <V> <W>.
23
Confirm with <RUN/ENTER>.
The measuring instrument automatically switches to the measuring mode.
47
Operation
handylab LF 12
4.7
Reset
You can reset (initialize) the measurement parameters and the configuration
parameters separately from one another.
Measurement
parameters
The following measured parameters (ϰ InI) are reset to the default condition:
Measuring mode
ϰ
Cell constant
0.475 cm-1 (calibrated)
0.475 cm-1 (set up)
Temperature compensation
nLF
Reference temperature
Temperature coefficient of the linear temperature compensation
2.000 %/K
TDS factor
1.00
Note
The calibration data gets lost when the measuring parameters are reset.
Recalibrate after performing a reset.
Configuration
parameters
48
The following configuration parameters (InI) are reset to the delivery status:
Baud rate
4800
Interval 1
(automatic save)
OFF
Interval 2
(for data transmission)
OFF
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Resetting the
measuring
paramters
Operation
1
Press the <RUN/ENTER> key and hold it down.
2
Press the <CAL> key.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1In I
Baud
Time
Day.Month No.
Year
Ident
4Yno
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
Resetting the
configuration
parameters
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 switches to the configuration parameters.
TDS UpH O
S
Sal
mV/pH
% mg/l
m S/cm
mbarM cm
1/ cmSal
°F° % /K TP
1In I
Baud
Time
Day.Month No.
Year
Ident
4Yno
C
Tref25 Tref20 AutoCal DIN Auto Store
LoBat nLF Lin Cal AutoCal TEC ARng AR RCL
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5
Using <V> <W>, switch between no and YES.
YES: Resetting the configuration parameters
no: Retaining settings.
6
Confirm with <RUN/ENTER>.
The measuring instrument automatically switches to the measuring mode.
49
Operation
50
handylab LF 12
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Maintenance, cleaning, disposal
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
2
1
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).
2
If necessary, take the four depleted batteries (2) out of the battery compartment.
3
Place four new batteries (type Mignon AA) in the battery compartment.
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.
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Maintenance, cleaning, disposal
handylab LF 12
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
52
Dispose of the measuring instrument as electronic waste at an appropriate
collection point. It is illegal to dispose of the instrument in household refuse.
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What to do if...
6
LoBat display
Instrument does
not react to keystroke
Error message OFL
What to do if...
Cause
Remedy
– Batteries almost empty
– Replace batteries
(see section 5.1 MAINTENANCE)
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.
Cause
Remedy
The measured value lies outside
the measuring range
Error message E3
Display to
Probe symbol
flashes
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– 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
solution
– Check calibration solutions
Cause
Remedy
– Time-out of the interface
– Check the instrument that is
connected
Cause
Remedy
– Calibration interval expired
– Recalibrate the measuring
system
53
What to do if...
Message StoFull
54
handylab LF 12
Cause
Remedy
– All memory locations are full
– Output data storage and clear
data storage
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handylab LF 12
Lists
7
Lists
This chapter provides additional information and orientation aids.
Abbreviations
Specialist terms
Index
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The list of abbreviations explains the indicators and the abbreviations that appear on the display and in the manual.
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.
The index will help you to find the topics that you are looking for.
55
Lists
handylab LF 12
Abbreviations
Conductivity value (international γ)
56
AR
AutoRead (drift control)
ARng
Automatic range switching
Measuring instrument measures with highest resolution
C
Cell constant [cm-1] (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)
TRef 20/T20
Reference temperature of 20 °C
TRef 25/T25
Reference temperature of 25 °C
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Lists
Glossary
Adjusting
AutoRange
AutoRead
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.
Name of the automatic selection of the measuring range.
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
Measured parameter
Name of the conductivity measuring technique.
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 solvent.
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 displayed by a measuring instrument.
Slope
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The slope of a linear calibration function.
57
Lists
handylab LF 12
Standard solution
TDS
TDS factor
Temperature
coefficient
The standard solution is a solution where the measured value is
known by definition. It is used to calibrate a measuring system.
Total dissolved solids
In conductometric measurements, the measuring instrument calculates 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.
Value of the slope of a linear temperature function.
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 behavior 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.
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Index
Index
A
LoBat 53
Analog output 43
Authorized use 13
AutoRead 21
N
C
Calibration 22
Calibration evaluation 22
Calibration protocol 22
Cell constant 22
determine 23
set manually 25
Conductivity 19
Conductivity/ Resistance 43
Connecting a printer 44
Connecting the plug-in power
supply 16
D
Data record 32
Data transmission (interval)
42
Default condition 48
Display 7
Drift control 21
E
Energy saving feature 17
Error messages 53
I
Initial commissioning 15
Initialization 48
Interval
data transmission 41
save 34
O
Operating safety 14
P
Printing
calibration protocol 22
R
Reference temperature
(conductivity) 18
Remote control 44
Replacing the batteries 51
Reset 48
RS232 interface 44
S
Safety 13
Safety precautions 13
Salinity 20, 43
Save interval 34
Scope of delivery 15
Setting the baud rate 45
Setting the date 15, 47
Setting the time 15, 47
T
TDS 20, 43
TDS factor 20
Temperature compensation
28, 31
K
Keys 6
L
Linear
temperature compensation 30
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Temperature compensation
(conductivity) 18
Temperature sensor
Conductivity 18
Total dissolved solids 20
59
Index
60
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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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