ba75370e01 12/2002
Operating manual
ba75370e
handylab pH/LF 12
AR
O
RCL
STO
C
A
L
AR
S
/
cm
Tref25
nLF
0
5
2
3
0
5
°
C
TP
M
pH/Conductivity measuring instrument
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.
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.
Warranty 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
© Mainz, Schott-Geräte GmbH, 2002
Reproduction in whole - or even in part - is prohibited without the
express written permission of Schott-Geräte GmbH, Mainz.
Printed in Germany.
handylab pH/LF 12 Contents
3
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.5 Operating structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.6 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 14
3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Switching on the measuring instrument . . . . . . . . . . . . . 17
4.2 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . 18
4.2.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 20
4.2.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 22
4.3 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.4 Conductivity/Salinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 35
4.4.2 Measuring the conductivity . . . . . . . . . . . . . . . . 37
4.4.3 Measuring the salinity . . . . . . . . . . . . . . . . . . . . 37
4.4.4 AutoRead AR (drift control) . . . . . . . . . . . . . . . . 38
4.4.5 Determining the cell constant (Calibration in the
control standard) . . . . . . . . . . . . . . . . . . . . . . . . 39
4.4.6 Setting the temperature compensation . . . . . . . 42
4.5 Calibration intervals (Int 3, Int 5) . . . . . . . . . . . . . . . . . . 46
4.6 Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.6.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 47
4.6.2 Switching on AutoStore (Int 1) . . . . . . . . . . . . . 49
4.6.3 Outputting the data storage . . . . . . . . . . . . . . . . 51
4.6.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 56
4.7 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.7.1 Data transmission interval (Int 2) . . . . . . . . . . . 57
4.7.2 PC/external printer (RS232 interface) . . . . . . . . 58
4.7.3 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.8 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Contents handylab pH/LF 12
4
4.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 67
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.1 pH system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.2 Conductivity system messages . . . . . . . . . . . . . . . . . . . 71
6.3 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
7 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
handylab pH/LF 12 Overview
5
1Overview
1.1 General features
This compact precision handheld meter enables you to carry out pH /
ORP measurements and conductivity measurements rapidly and reliably.
The handheld meter provides the maximum degree of operating comfort, reliability and measuring certainty for all applications.
The proven MultiCal
®
calibration procedures or the proven procedure
for adjusting or setting the cell constant and the special AutoRead function support you in your work with the handheld meter.
1 Keypad
2 Sample display
3 Jack field
AR
O
RCL
STO
C
A
L
AR
S
/
cm
Tref25
nLF
0
5
2
3
0
5
°
C
TP
M
1
2
3
Overview handylab pH/LF 12
6
1.2 Keypad
Key functions
M
CAL
STO
RUN/ENTER
AR
RCL
Select the measured variable <M>:
– pH value / ORP voltage
– Conductivity / salinity
Save a measured value
<STO>
Switch measuring instrument on/off
<ON/OFF>
Calibrate the currently set measured variable
<CAL>
Display/transmit measured values
<RCL>
Activate/deactivate the AutoRead function
<AR>
Select the measuring mode, increase values,
scroll <
>
Select the measuring mode, decrease values,
scroll <
>
Confirm entries, start AutoRead
<RUN/ENTER>
M
STO
CAL
RCL
AR
RUN/ENTER
handylab pH/LF 12 Overview
7
1.3 Display
1.4 Jack field
1 Conductivity measuring cell
2 pH electrode
3 pH temperature probe
4 Plug-in power supply (optional)
5 Serial interface RS 232
Sal
S
mg/l
M
cm
%
mbar
O
°
F
TDS
Time
Baud
Day.Month No.
Ident
Year
8
8.
8
8
8
8
°
C
LoBat
1
UpH
RCL
Auto
Store
ARng
AR
S/
m
AutoCal DIN
AutoCalTEC
cm
Lin
Tref25
Tref20
nLF
Cal
mV/pH
Sal
1/
cm
/
K
%
TP
Status display
Meas. value display
Function and
temperature display
Probe symbol
5
123
4
Overview handylab pH/LF 12
8
1.5 Operating structure
The following overview diagram shows which keys you have to press
to select between the different measuring modes:
Note
When connecting a conductivity measuring cell with temperature
probe, the measuring instrument recognizes the probe and automatically switches to the last selected conductivity measuring mode. As
soon as the probe is disconnected, the instrument switches to the pH
or ORP measuring mode.
handylab pH/LF 12 Overview
9
1.6 Technical data
Dimensions
and weight
Mechanical
structure
Electrical
safety
Test certificates
Ambient
conditions
pH/ORP measuring
ranges
Precision of
pH/ORP
(± 1 digit)
pH correction function
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
annual average < 90 %
Measuring range Resolution
pH - 2.00 ... + 19.99 0.01
U [mV] - 1999 ... + 1999 1
T [°C] - 5.0 ... + 105.0 0.1
pH (after calibration) ± 0.01
U [mV] ± 1
T [°C] ± 0.1
Temperature input
Manually [°C] - 20 ... + 130
Overview handylab pH/LF 12
10
Measuring ranges of
conductivity
Precision of
conductivity (± 1 digit)
Cell constant,
calibrating
Reference
temperature of
conductivity
Measuring range Resolution
[µS/cm] 0 ... 1999 1
[mS/cm] 0.00 ... 19.99
0.0 ... 199.9
0 ... 500
0.01
0.1
1
SAL 0.0 ... 70.0 accord-
ing to the IOT table
0.1
T [°C]
− 5.0 ... + 105.0 0.1
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
T [°C] ± 0.1
C [cm-1] 0.450 ... 0.500
Tref Can be set to 20 °C or 25 °C
handylab pH/LF 12 Overview
11
Serial
interface
Automatic switchover if a PC or printer is connected.
Power
supply
Type RS232, data output
Baud rate Selectable 1200, 2400, 4800, 9600 baud
Data bits 8
Stop bit 2
Parity None
Handshake RTS/CTS + Xon/Xoff
Cable length Max. 15 m
Batteries 4 x 1.5 V alkali-manganese batteries, Type
AA
Operational life approx. 3000 operating hours
Mains The following applies to all plug-in power
supplies:
Connection max. overvoltage category II
Plug-in power supply with Euro plug:
FRIWO FW1199, 11.7864
Friwo Part. No. 1762613
Input: 230 V ~ / 50 Hz / 5.6 VA
Output: 12 V = / 130 mA / 1.56 VA
Plug-in power supply with US plug:
FRIWO FW1199, 11.7880
Friwo Part. No. 1794043
Input: 120 V ~ / 60 Hz / 6 VA
Output: 12 V = / 150 mA
Plug-in power supply with UK plug:
FRIWO FW1199, 11.7872
Friwo Part No. 1816491
Input: 230V ~ / 50 Hz / 5.6 VA
Output: 12 V = / 130 mA / 1.56 VA
Overview handylab pH/LF 12
12
Applicable
guidelines and norms
EMC EEC guideline 89/336/EEC
EN 61326-1:1997
EN 61000-3-2:1995 + pr A14:2000
EN 61000-3-3:1995
FCC Class A
Instrument safety EG guideline 73/23/EEC
EN 61010-1 A2:1995
Climatic class VDI/VDE 3540
Type of protection EN 60529:1991
handylab pH/LF 12 Safety
13
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the 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 the following safe-
ty labels to indicate various types of danger:
Warning
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 pH and ORP measurement or the measurement of the conductivity
and salinity in the field and laboratory.
The technical specifications as given in section 1.6 T
ECHNICAL 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.
Safety handylab pH/LF 12
14
2.2 General safety instructions
This instrument is built and inspected according to the relevant guidelines and norms for electronic measuring instruments (see
section 1.6 T
ECHNICAL 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 chapter 6 W
HAT TO DO IF....
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:
l has been damaged in transport
l has been stored under adverse conditions for a lengthy period of
time
l is visibly damaged
l no longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the instrument.
Obligations of the pur-
chaser
The purchaser of the measuring instrument must ensure that the following laws and guidelines are observed when using dangerous substances:
l EEC directives for protective labor legislation
l National protective labor legislation
l Safety regulations
l Safety datasheets of the chemical manufacturers.
handylab pH/LF 12 Commissioning
15
3 Commissioning
3.1 Scope of delivery
l handylab pH/LF 12 handheld meter
l Operating manual and short operating manual
l 4 batteries, 1.5 V Mignon type AA (in the instrument)
3.2 Initial commissioning
Perform the following activities:
l Set the date and time
l Connect the plug-in power supply (optional)
Setting the date and
time
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 ap-
pears on the display.
4 Set the date of the current day with <
> <>.
5 Confirm with <RUN/ENTER>.
The date (month) flashes in the display.
6 Set the current month with <
> <>.
7 Confirm with <RUN/ENTER>.
The year appears on the display.
8 Set the current year with <
> <>.
9 Confirm with <RUN/ENTER>.
The hours flash on the display.
10 Set the current time with <
> <>.
11 Confirm with <RUN/ENTER>.
The minutes flash on the display.
12 Set the current time with <
> <>.
13 Confirm with <RUN/ENTER>.
The instrument switches to a measuring mode.
Commissioning handylab pH/LF 12
16
Connecting the original
plug-in power supply
unit
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 VDC). This saves the batteries.
Warning
The line voltage at the operating site must lie within the input voltage
range of the original plug-in power supply (see section 1.6 T
ECHNICAL
DATA).
Warning
Use original plug-in power supplies only (see
section 1.6 T
ECHNICAL DATA).
1 Plug the jack (1) into the socket (2) of the measuring instru-
ment.
2 Connect the original SCHOTT plug-in power supply (3) to an
easily accessible mains socket.
2
1
3
handylab pH/LF 12 Operation
17
4 Operation
4.1 Switching on the measuring instrument
Measuring mode when
switching on
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
l if the power is supplied by the plug-in power supply,
l if the AutoStore function is active,
l if the communication cable and a PC with a running communication
program are connected,
l if the printer cable is connected (for external printers).
1 Press the <ON/OFF> key.
The display test appears briefly on the display.
After this, the measuring instrument automatically switches to
the measuring mode.
Connected sensor Measuring mode
No sensor or pH/ORP electrode pH or ORP measurement (de-
pending on the last setting)
Conductivity measuring cell Last selected measuring mode
2 sensors Last selected measuring mode
Operation handylab pH/LF 12
18
4.2 pH value / ORP voltage
4.2.1 General information
Preparatory activities Perform the following preparatory activities when you want to measure:
Note
Incorrect calibration of pH electrodes leads to incorrect measured values. Calibrate regularly before measuring. You can only connect electrodes of the NTC30 type or without temperature probe.
Warning
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.
1 Connect the pH electrode to the measuring instrument.
If necessary, press the <M> key repeatedly until the status dis-
play pH (pH measurement) or U (measurement of the ORP
voltage) appears.
2 Adjust the temperature of the buffer solutions or test solutions,
or measure the current temperature, if you measure without a
temperature probe.
3 Calibrate or check the measuring instrument with the elec-
trode.
4Using <
> <>, toggle between the pH or mV measuring
modes.
handylab pH/LF 12 Operation
19
Temperature measure-
ment in pH measure-
ments
You can perform pH measurements with or without a temperature
probe as well as with the temperature probe of a conductivity measuring cell. The measuring instrument recognizes which sensors are connected and automatically switches to the correct mode for the
temperature measurement.
The following cases are distinguishable.
* If you do not wish that, you can:
– either disconnect the 2nd sensor and use the manual temperature
input or
– use an electrode with a temperature probe.
If a temperature probe is connected, it is indicated on the display by TP.
Note
When calibrating without a temperature probe (no TP display indicator
displayed), enter the current temperature of the respective buffer solution manually using the <
> <> keys while keeping the
<RUN/ENTER> key depressed.
Temperature probe Display Mode
pH Cond
yes - TP Automatic with
pH temperature probe
yes yes TP
- - Manual
-yesTP
flashes
The temperature value of the
2nd sensor (Cond) in the
same test sample is used for
the pH measurement*
Operation handylab pH/LF 12
20
4.2.2 Measuring the pH value
AutoRead AR
(drift control)
The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of the measured values.
For identical measurement conditions, the following criteria apply:
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the pH electrode in the test sample.
3 Press the <> <> keys until pH appears in the status display.
The pH value appears on the display.
4 When measuring without a connected temperature probe:
Options:
l Determine the current temperature using a thermometer
and, while keeping the <RUN/ENTER> key depressed, enter this temperature value with <
> <>.
l TP display indicator not displayed, socket for the second
probe is free:
Connect the second probe (Cond) and immerse it in the
same test sample. TP flashes, the temperature is automatically measured using the second probe.
Tref20
Lin
Cal
8
1
S
SalOU
%
mg/l
mV/pH
1/
cm
Sal
AutoCal DIN
Tref25
nLF
AutoCalTEC
RCL
Auto
Store
LoBat
ARng
AR
Time
Baud
Day.Month No.
Ident
Year
mbar
TDS
cm
M
°
F
/
K
%
S/
m
cm
8
4
2
9
9
6
°
C
TP
pH
Reproducibility Response time
Better than 0.02 > 30 seconds
1 Call up the pH measuring mode with <M> and <> <> .
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
handylab pH/LF 12 Operation
21
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
3 Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
This measured value is transmitted to the interface.
4 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
5 To terminate the AutoRead function: Press the <AR> key.
Operation handylab pH/LF 12
22
4.2.3 Measuring the ORP voltage
In conjunction with an ORP electrode, e.g. BlueLine 31Rx, the measuring instrument can measure the ORP voltage (mV) of a solution.
Note
ORP electrodes are not calibrated. However, you can check ORP electrodes using a test solution.
1 Perform the preparatory activities according to section 4.2.1.
2 Submerse the ORP electrode in the sample.
3 Press the <> <> keys until the U status display appears.
The ORP voltage (mV) of the test sample appears on the display.
4 Wait for a stable measured value.
/pH
Tref20
Cal
8
TDS
S
8
1
pH
SalO
%
mg/l
1/
cm
Sal
AutoCal DIN
Lin
Tref25
nLF
AutoCalTEC
RCL
Auto
Store
LoBat
ARng
AR
Time
Baud
Day.Month No.
Ident
Year
mbar
cm
M
°
F
/
K
%
S/
m
cm
8
4
2
2
3
°
C
TP
U
mV
handylab pH/LF 12 Operation
23
4.3 pH calibration
Why calibrate? pH electrodes age. This changes the asymmetry (zero point) and slope
of the pH electrode. As a result, an inexact measured value is displayed. Calibration determines the current values of the asymmetry
and slope of the electrode and stores them in the measuring instrument. Thus, you should calibrate at regular intervals.
When to calibrate?
l After connecting another electrode
l When the sensor symbol flashes
– (after the calibration interval has expired)
– after a voltage interruption, e. g. after changing the batteries
You can select one of 3 calibration procedures:
AutoCal TEC is specially matched to the SCHOTT technical buffer solutions as a fully
automatic two-point calibration. The buffer solutions are automatical-
ly recognized by the measuring instrument. Depending on the instrument setting (see section 4.8 C
ONFIGURATION), the instrument displays
the relevant buffer nominal value or the current electrode voltage in
mV. The calibration can be terminated after the first buffer solution.
This corresponds to a single-point calibration. When doing so, the in-
strument uses the Nernst slope (-59,2 mV/pH at 25 °C) and determines
the asymmetry of the electrode.
AutoCal DIN is specially adapted to the permanently programmed buffer solutions in
accordance with DIN 19266 as a fully automatic two-point calibration.
The operating sequence of the AutoCal DIN calibration corresponds to
that of the AutoCal TEC calibration. The calibration can only be terminated after the first buffer solution (single point calibration).
ConCal This function is a conventional two-point calibration using two buffer
solutions (pH 7.0 ± 0.5 and any other buffer solution) or a single-point
calibration using any buffer solution, which is used as a high-speed
method.
AutoRead When calibrating with AutoCal TEC and AutoCal DIN, the AutoRead
function is automatically activated.
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
Displaying the calibra-
tion data
You can view the data of the last calibration on the display. The proceeding is described on page 53.
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 55).
Operation handylab pH/LF 12
24
Note
You can automatically print a calibration protocol after the calibration.
To do so, connect a printer to the interface according to section 4.7.2
before calibrating. After a valid calibration, the record is printed.
Sample printout:
Calibration evaluation After the calibration, the measuring instrument automatically evaluates
the calibration. The asymmetry and slope are evaluated separately.
The worst evaluation appears on the display.
CALIBRATION PROTOCOL
02.03.01 14:19
Device No.: 12345678
Calibration pH
Cal time: 01.03.01 / 15:20
Cal interval: 7d
AutoCal TEC Tauto
Buffer 1 2.00
Buffer 2 4.01
Buffer 3 7.00 *
Buffer 4 10.01
C1 184.1 mV 25.0°C
C2 3.0 mV 25.0°C
S1 -59.4 mV/pH
ASY1 - 4 mV
Display Asymmetry
[mV]
Slope
[mV/pH]
-15 ... +15 -60.5 ... -58
-20 ... +20 -58 ... -57
-25 ... +25 -61 ... -60.5
or
-57 ... -56
Clean the electrode according to the
electrode operating manual
-30 ... +30 -62 ... -61
or
-56 ... -50
E3
Eliminate the error according to chapter 6 W
HAT TO DO IF...
< -30 or
> 30
< -62 or
> -50
handylab pH/LF 12 Operation
25
Preparatory activities
4.3.1 AutoCal TEC
For this procedure, use any two technical buffer solutions (pH values at
25 °C: 2.00 / 4.01 / 7.00 / 10.01).
Note
The calibration for pH 10.01 is optimized for the SCHOTT technical
buffer solution pH 10.01. Other buffer solutions can lead to an erroneous calibration. The correct buffer solutions are given in the SCHOTT
catalog or in the Internet.
Note
The buffer solutions are automatically recognized by the measuring instrument. Depending on the instrument setting (see
section 4.8 C
ONFIGURATION ), the instrument displays the relevant buff-
er nominal value or the current electrode voltage in mV.
Note
Skip the steps 2 and 7 if you use a pH electrode with a temperature
probe or the temperature probe of a conductivity measuring cell.
1 Connect the pH electrode to the measuring instrument.
If necessary, press the <M> key repeatedly until the status display pH (pH measurement) or U (measurement of the ORP
voltage) appears.
2 Keep the buffer solutions ready.
3 Adjust the temperature of the solution and measure the current
temperature if the measurement is made without the use of a
temperature probe (the TP display indicator is missing from the
display).
1 Press the <CAL> key repeatedly until the Ct1 display indicator
and the function display AutoCal TEC appears. The sensor
symbol displays the evaluation of the last calibration (or no
sensor symbol in the delivery state or after the measurement
parameters have been reset).
Operation handylab pH/LF 12
26
Note
At this point, the AutoCal TEC calibration can be terminated with <M>.
This corresponds to a single-point calibration. When doing so, the in-
2 If required, enter the temperature of the first buffer solution with
<
> <> while keeping the <RUN/ENTER> key depressed.
3 Immerse the pH electrode in the first buffer solution.
4 Press the <RUN/ENTER> key.
The AR display indicator flashes.
The electrode voltage (mV) or the buffer nominal value appears on the display. Example:
5 When the measured value is stable, Ct2 appears.
/pH
mV
TDS
OU
Tref20
Cal
8
S
1
Sal
%
mg/l
1/
cm
Sal
AutoCal DIN
Lin
Tref25
nLF
RCL
Auto
Store
LoBat
ARng
AR
Time
Baud
Day.Month No.
Ident
Year
mbar
cm
M
°
F
/
K
%
S/
m
cm
8
4
2
t
1
°
C
TP
pH
C
AutoCalTEC
cm
3
7
°
F
0
Cal
Tref20
Lin
0
Cal
Tref25
ARng
AutoCal DIN
Tref25
Auto
AutoCal DIN
ARng
Tref20
Lin
F
cm
1/1/
cm
AR
AR
RCL
RCL
OO UpHUpH SalSal
Store
Store
Auto
LoBat
LoBat
nLF
nLF
SalSal
%%
mg/lmg/l
mV/pHmV/pH
cm
°
mm
S/S/
cmcm
%%
//
KK
MM
TDSTDS
11
SS
mbarmbar
Time
Baud
Day.Month No.
Ident
Year
Time
Baud
Day.Month No.
Ident
Year
0
03
7
pHpH
C
°
C
°
AutoCalTEC
AutoCalTEC
ARAR
mV
88
44
22
TP
TP
/pH
mV
TDS
OU
Tref20
Cal
8
S
1
Sal
%
mg/l
1/
cm
Sal
AutoCal DIN
Lin
Tref25
nLF
RCL
Auto
Store
LoBat
ARng
AR
Time
Baud
Day.Month No.
Ident
Year
mbar
cm
M
°
F
/
K
%
S/
m
cm
8
4
2
t
2
°
C
TP
pH
C
AutoCalTEC
handylab pH/LF 12 Operation
27
strument uses the Nernst slope (-59,2 mV/pH at 25 °C) and determines
the asymmetry of the electrode.
6 Thoroughly rinse the electrode with deionized water.
7 If required, enter the temperature of the second buffer solution
with <
> <> while keeping the <RUN/ENTER> key de-
pressed.
8 Immerse the pH electrode in the second buffer solution.
9 Press the <RUN/ENTER> key.
The AR display indicator flashes.
The electrode voltage (mV) or the buffer nominal value appears on the display. Example:
10 When the measured value is stable, AR disappears. The value
of the slope (mV/pH) appears on the display. The probe symbol
shows the evaluation of the current calibration.
11 Press the <RUN/ENTER> key. The value of the asymmetry
(mV) appears on the display.
1
TDS
S
°
F
0
Cal
Tref20
Lin
0
Cal
Tref25
ARng
AutoCal DIN
Tref25
Auto
AutoCal DIN
ARng
Tref20
Lin
F
cm
1/1/
cm
AR
AR
RCL
RCL
OO UpHUpH SalSal
Store
Store
Auto
LoBat
LoBat
nLF
nLF
SalSal
%%
mg/lmg/l
mV/pHmV/pH
cmcm
°
mm
S/S/
cmcm
%%
//
KK
MM
TDS
1
S
mbarmbar
Time
Baud
Day.Month No.
Ident
Year
Time
Baud
Day.Month No.
Ident
Year
88
44
08
14
4
pHpH
C
°
C
°
AutoCalTEC
AutoCalTEC
ARAR
mV
1
22
TP
TP
O
L
S
RCL
Sal
cm
AutoCal DIN
Day.Month
S
Tref20
Cal
Ident
No.
Year
Time
Baud
1
TDS
Sal
Store
AR
Tref25
cm
C
/
%
K
TP
°
M
mbar
1/
%
m
mg/l
cm
S/
Lin
OU
nLF
Auto
LoBat
ARng
°
F
9
4
pH
5
mV/pH
AutoCalTEC
Operation handylab pH/LF 12
28
12 Switch to the measuring mode with <M>.
YA
S
0
RCL
Sal
cm
AutoCal DIN
Time
Day.Month
Sal
Store
AR
8
No.
Ident
Tref20
Tref25
Year
Baud
cm
C
/
%
K
TP
°
M
mbar
1/
%
m
mg/l
cm
S/
TDS
6
Lin
Cal
1
S
OU
nLF
Auto
LoBat
ARng
°
F
2
pH
mV
AutoCalTEC
handylab pH/LF 12 Operation
29
4.3.2 AutoCal DIN
For this procedure, use two different standard buffer solutions according to DIN 19266 (type A, C, D or F with pH values at 25 °C of: 1.679 /
4.006 / 6.865 / 9.180).
Note
Skip the steps 2 and 7 if you use a pH electrode with a temperature
probe or the temperature probe of a conductivity measuring cell.
1 Press the <CAL> key repeatedly until the display Cd1 and the
function display AutoCal DIN appear. The sensor symbol displays the evaluation of the last calibration (or no sensor symbol
in the delivery state or after the measurement parameter has
been reset).
2 If required, enter the temperature of the first buffer solution with
<
> <> while keeping the <RUN/ENTER> key depressed.
3 Immerse the pH electrode in the first buffer solution.
4 Press the <RUN/ENTER> key.
The AR display indicator flashes.
The electrode voltage (mV) or the buffer nominal value appears on the display. Example:
AutoCalTEC
/pH
mV
TDS
OU
Tref20
Cal
8
S
1
Sal
%
mg/l
1/
cm
Sal
Lin
Tref25
nLF
RCL
Auto
Store
LoBat
ARng
AR
Time
Baud
Day.Month No.
Ident
Year
mbar
cm
M
°
F
/
K
%
S/
m
cm
8
4
2
d
1
°
C
TP
pH
C
AutoCal DIN
AutoCalTEC
AutoCalTEC
°
F
0
Cal
Tref20
Lin
0
Cal
Tref25
ARng
Tref25
Auto
ARng
Tref20
Lin
F
cm
1/1/
cm
AR
AR
RCL
RCL
OO UpHUpH SalSal
Store
Store
Auto
LoBat
LoBat
nLF
nLF
SalSal
%%
mg/lmg/l
mV/pHmV/pH
cmcm
°
mm
S/S/
cmcm
%%
//
KK
MM
TDSTDS
11
SS
mbarmbar
Time
Baud
Day.Month No.
Ident
Year
Time
Baud
Day.Month No.
Ident
Year
0
17
4
pHpH
C
°
C
°
ARAR
mV
88
44
22
TP
TP
7
1
AutoCal DIN AutoCal DIN
Operation handylab pH/LF 12
30
Note
At this point, the AutoCal DIN calibration can be terminated with <M>.
This corresponds to a single-point calibration. When doing so, the in-
strument uses the Nernst slope (-59,2 mV/pH at 25 °C) and determines
the asymmetry of the electrode.
5 When the measured value is stable, Cd2 appears.
6 Thoroughly rinse the electrode with deionized water.
7 If required, enter the temperature of the second buffer solution
with <
> <> while keeping the <RUN/ENTER> key de-
pressed.
8 Immerse the pH electrode in the second buffer solution.
9 Press the <RUN/ENTER> key.
The AR display indicator flashes.
The electrode voltage (mV) or the buffer nominal value appears on the display. Example:
AutoCalTEC
/pH
mV
TDS
OU
Tref20
Cal
8
S
1
Sal
%
mg/l
1/
cm
Sal
Lin
Tref25
nLF
RCL
Auto
Store
LoBat
ARng
AR
Time
Baud
Day.Month No.
Ident
Year
mbar
cm
M
°
F
/
K
%
S/
m
cm
8
4
2
d
2
°
C
TP
pH
C
AutoCal DIN
AutoCalTEC
AutoCalTEC
°
F
0
Cal
Tref20
Lin
0
Cal
Tref25
ARng
Tref25
Auto
ARng
Tref20
Lin
F
cm
1/1/
cm
AR
AR
RCL
RCL
OO UpHUpH SalSal
Store
Store
Auto
LoBat
LoBat
nLF
nLF
SalSal
%%
mg/lmg/l
mV/pHmV/pH
cmcm
°
mm
S/S/
cmcm
%%
//
KK
MM
TDSTDS
11
SS
mbarmbar
Time
Baud
Day.Month No.
Ident
Year
Time
Baud
Day.Month No.
Ident
Year
1
89
9
pHpH
C
°
C
°
ARAR
mV
88
44
22
TP
TP
2
1
AutoCal DIN
AutoCal DIN
handylab pH/LF 12 Operation
31
10 When the measured value is stable, AR disappears. The value
of the slope (mV/pH) appears on the display. The probe symbol
shows the evaluation of the current calibration.
11 Press the <RUN/ENTER> key. The value of the asymmetry
(mV) appears on the display.
12 Switch to the measuring mode with <M>.
O
L
S
RCL
Sal
cm
AutoCal DIN
Day.Month
S
Tref20
Cal
Ident
No.
Year
Time
Baud
1
TDS
Sal
Store
AR
Tref25
cm
C
/
%
K
TP
°
M
mbar
1/
%
m
mg/l
cm
S/
Lin
OU
nLF
Auto
LoBat
ARng
°
F
9
4
pH
5
mV/pH
AutoCalTEC
AutoCalTEC
YA
S
0
RCL
Sal
cm
Time
Day.Month
Sal
Store
AR
8
No.
Ident
Tref20
Tref25
Year
Baud
cm
C
/
%
K
TP
°
M
mbar
1/
%
m
mg/l
cm
S/
TDS
6
Lin
Cal
1
S
OU
nLF
Auto
LoBat
ARng
°
F
2
pH
mV
AutoCal DIN
Operation handylab pH/LF 12
32
4.3.3 ConCal
Two-point calibration For this procedure, use two buffer solutions:
l pH 7.0 ± 0.5
l any other buffer solution
Note
Skip the steps 2 and 9 if you use a pH electrode with a temperature
probe or the temperature probe of a conductivity measuring cell.
Note
At this point, the ConCal calibration can be broken off with <M>. This
corresponds to a single-point calibration. When doing so, the instru-
ment uses the Nernst slope (-59,2 mV/pH at 25 °C) and the fixed asymmetry of the electrode.
1 Press the <CAL> key repeatedly until the ASY display and the
Cal function display appears. The sensor symbol displays the
evaluation of the last calibration (or no sensor symbol in the delivery state or after the measurement parameter has been reset).
2 If required, enter the temperature of the first buffer solution with
<
> <> while keeping the <RUN/ENTER> key depressed.
3 Immerse the pH electrode in the first buffer solution (pH 7.0 ±
0.5 in two-point calibration).
4 Press the <RUN/ENTER> key.
The measured pH value appears on the display.
5 Set the measured value to the nominal pH value of the buffer
solution (at the current temperature) with <
> <>.
6 When the measured value is stable, press the <RUN/ENTER>
key. The value of the asymmetry appears.
7 Press the <RUN/ENTER> key. SLO appears.
/
K
cm
Sal
1
S
OU
8
°
F
%
1/
cm
mV/pH
S/
m
cm
M
%
mg/l
mbar
Lin
Tref25
nLF
Time
Baud
Day.Month No.
Ident
Year
LoBat
AutoCal DIN
AutoCalTEC
RCL
Auto
Store
ARng
AR
TDS
Sal
Tref20
8
4
2
S
Y
A
pH
Cal
°
C
TP
handylab pH/LF 12 Operation
33
8 Thoroughly rinse the electrode with deionized water.
9 If required, enter the temperature of the second buffer solution
with <
> <> while keeping the <RUN/ENTER> key de-
pressed.
10 Immerse the pH electrode in the second buffer solution.
11 Press the <RUN/ENTER> key.
12 Set the measured value to the nominal pH value of the buffer
solution (at the current temperature) with <
> <>.
13 When the measured value is stable, press the <RUN/ENTER>
key. The value of the slope (mV/pH) appears on the display.
The probe symbol shows the evaluation of the current calibration.
14 Press the <RUN/ENTER> key. The value of the asymmetry
(mV) appears on the display.
/
K
cm
Sal
1
S
OU
8
°
F
%
1/
cm
mV/pH
S/
m
cm
M
%
mg/l
mbar
Lin
Tref25
nLF
Time
Baud
Day.Month No.
Ident
Year
LoBat
AutoCal DIN
AutoCalTEC
RCL
Auto
Store
ARng
AR
TDS
Sal
Tref20
8
4
2
L
O
S
pH
Cal
°
C
TP
AutoCalTEC
O
L
S
RCL
Sal
cm
AutoCal DIN
Day.Month
S
Tref20
Ident
No.
Year
Time
Baud
1
TDS
Sal
Store
AR
Tref25
cm
C
/
%
K
°
M
mbar
1/
%
m
mg/l
cm
S/
Lin
OU
nLF
Auto
LoBat
ARng
°
F
9
2
pH
5
mV/pH
Cal
TP
Operation handylab pH/LF 12
34
15 Switch to the measuring mode with <M>.
Lin
AutoCal DIN
AutoCalTEC
YA
S
0
RCL
Sal
cm
Time
Day.Month
Sal
Store
AR
8
No.
Ident
Tref20
Tref25
Year
Baud
cm
C
/
%
K
TP
°
M
mbar
1/
%
m
mg/l
cm
S/
TDS
6
1
S
OU
nLF
Auto
LoBat
ARng
°
F
3
pH
mV
Cal
handylab pH/LF 12 Operation
35
4.4 Conductivity/Salinity
4.4.1 General information
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.
Preparatory activities Perform the following preparatory activities when you want to measure:
Temperature probe Only carry out measurements with a temperature probe. The tempera-
ture probe is shown on the display by TP.
Temperature
compensation
Selectable linear or nonlinear temperature compensation, can be
switched off (see section 4.8 C
ONFIGURATION).
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 S
WITCHING OVER THE REFERENCE TEMPERA-
TURE, page 62.
1 Connect a conductivity measuring cell to the measuring instru-
ment. The instrument automatically switches over to conductivity measurement (status display or SAL).
If the conductivity measuring cell is already connected, press
the <M> key repeatedly until the status display or SAL ap-
pears.
2 Check the selected cell constant (see below) or calibrate the
measuring instrument with the measuring cell (see
section 4.4.5).
3 Using <> <>, toggle between the measuring modes, con-
ductivity ( in
µS/cm) or salinity (SAL).
Operation handylab pH/LF 12
36
Checking the cell con-
stant
1 Press the <RCL> key repeatedly until CAL disp appears on the
display.
2 Press the <RUN/ENTER> repeatedly until the last calibrated
cell constant is displayed, e. g. 0.472 cm
-1
.
3 To return to the measuring mode: Press the <M> key when the
correct cell constant is displayed.
4 If you want to recalibrate the cell constant, proceed according
to section 4.4.5 D
ETERMINING THE CELL CONSTANT (CALIBRATION
IN THE CONTROL STANDARD).
OUpH Sal
Store
AR
Auto
AutoCal DIN
AutoCalTEC
LoBat
Cal
ARng
Tref25
Tref20
Lin
nLF
Sal
%
mg/l
mV/pH
cm
°
°
TP
m
S/
cm
cm
1/
F
C
%
/
K
M
TDS
1
S
mbar
Time
Baud
Day.Month No.
Ident
Year
P
dS
I
RCL
A
L
C
L
C
S
1
LoBat
Lin
nLF
Tref20
ARng
AR
°
°
TP
F
C
%
/
K
M
%
mg/l
mV/pH
m
S/
cm
Sal
TDS
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCalTEC
Time
Baud
Day.Month No.
Ident
Year
2
07
4
cm
1/
Tref25
RCL
C
Cal
handylab pH/LF 12 Operation
37
4.4.2 Measuring the conductivity
You can meaure the conductivity as follows:
4.4.3 Measuring the salinity
You can measure the salinity as follows:
1 Perform the preparatory activities according to section 4.4.1.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the < > <> keys until and the unit µS/cm appears
in the status display. The conductivity value appears on the display.
1 Perform the preparatory activities according to section 4.4.1.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the <> <> keys until the Sal status display appears.
The salinity value appears on the display.
AR
8
1
cm
1/
/
K
%
°
F
RCL
Cal
Lin
Tref20
LoBat
M
m
Sal
TDS
S
Auto
Store
Sal
mbar
%
mg/l
OUpH
mV/pH
cm
AutoCal DIN
AutoCalTEC
Time
Baud
Day.Month No.
Ident
Year
0
4
2
3
0
5
°
TP
S/
cm
C
Tref25
nLF
ARng
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
AutoCalTEC
Time
Baud
Day.Month No.
Ident
Year
2
1
2
2
3
3
°
TP
Sal
C
nLF
Operation handylab pH/LF 12
38
4.4.4 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
(accepting the current value) by pressing <RUN/ENTER>. You can
only change to another measuring mode after completion of AutoRead.
1 Select the or SAL measuring mode with <M> and/or <>
<
>.
2 Immerse the conductivity measuring cell in the test sample.
3 Activate the AutoRead function with <AR>. The current mea-
sured value is frozen (hold function).
4 Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
This measured value is transmitted to the interface.
5 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
6 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
AutoCalTEC
Time
Baud
Day.Month No.
Ident
Year
0
5
2
3
0
5
°
AR
TP
S/
cm
C
Tref25
nLF
handylab pH/LF 12 Operation
39
4.4.5 Determining the cell constant (Calibration in the control
standard)
Why determine the cell
constant?
Aging slightly changes the cell constant, 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 value of the cell constant and stores this value in the
instrument.
Thus, you should calibrate at regular intervals.
In the delivery condition, the cell constant of the measuring instruments
is set to 0.475 cm
-1
.
AutoRead The calibration procedure automatically activates the AutoRead func-
tion. The AR display indicator flashes. The calibration process is finished when AR stops flashing.
Displaying calibration
data
You can view the data of the last calibration on the display. The proceeding is described on page 53.
Printing the
calibration protocol
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 55).
Note
You can automatically print a calibration protocol after the calibration.
To do so, connect a printer to the interface according to section 4.7.2
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 : +++
Operation handylab pH/LF 12
40
Calibration evaluation After the calibration, the measuring instrument automatically evaluates
the current status of the calibration. The evaluation appears on the display.
Determining the cell
constant
You can determine the cell constant as follows:
Display Cell constant [cm
-1
]
0.450 ... 0.500 cm
-1
E3
Eliminate the error according to
chapter 6 W
HAT TO DO IF...
Outside the range
0.450 ... 0.500 cm
-1
1 Press the <CAL> key repeatedly until the and CELL status
displays appear.
2 Press the <RUN/ENTER> key. The CAL display appears, as
well as
– the current, calibrated cell constant (with sensor symbol on
the display) or
– the fixed cell constant 0.475 1/cm (without sensor symbol
on the display). In this case, the measurement parameters
are initialized. See “Reset” on page 64.
3 Immerse the conductivity measuring cell in the control standard
solution, 0.01 mol/l KCI.
4 Press the <RUN/ENTER> key.
The AutoRead 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.
AR
AR
RCL
RCL
OO UpHUpH SalSal
Store
Store
Auto
Auto
AutoCal DINAutoCal DIN
AutoCalTEC
AutoCalTEC
LoBat
LoBat
ARng
ARng
Tref20
Tref20
Lin
Lin
nLF
nLF
SalSal
%%
mg/lmg/l
mV/pHmV/pH
cmcm
°°
°°
TP
TP
mm
S/S/
cmcm
FF
CC
%%
//
KK
MM
TDSTDS
11
SS
mbarmbar
Time
Baud
Day.Month No.
Ident
Year
Time
Baud
Day.Month No.
Ident
Year
52
0077
44
AA
LL
CC
cmcm
1/1/
Tref25
Tref25
Cal
Cal
handylab pH/LF 12 Operation
41
Note
If the error message
E3
E3E3
E3
appears, refer to chapter 6 WHAT TO DO IF...
5 To return to the measuring mode: Press the <M> key. The de-
termined cell constant is taken over for the measurement.
S
1
LoBat
Lin
nLF
Tref20
RCL
ARng
AR
°
°
TP
F
C
%
/
K
M
%
mg/l
mV/pH
m
S/
cm
Sal
TDS
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCalTEC
Time
Baud
Day.Month No.
Ident
Year
3
07
4
Cal
cm
1/
Tref25
A
L
C
AR
Operation handylab pH/LF 12
42
4.4.6 Setting the temperature compensation
The calculation of the temperature compensation is based on the preset reference temperature, Tref 20 or Tref 25 (see
section 4.8 C
ONFIGURATION).
You can select one of the following temperature compensations:
l Nonlinear temperature compensation (nLF)
according to EN 27 888
l Linear temperature compensation (Lin) with adjustable coeffi-
cient in the range 0.001 ... 3.000 %
/K
l No temperature compensation (----)
Note
ips Select the following temperature compensations given in the table ac-
cording to the respective test sample:
Application tips
Test sample Temperature compensation Display in-
dicator
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
Sal,
handylab pH/LF 12 Operation
43
Selecting the nonlinear
temperature compensa-
tion
You can select the nonlinear temperature compensation as follows:
Selecting the linear
temperature compensa-
tion
You can select the linear temperature compensation as follows:
1 Press the <CAL> key repeatedly until the status displays
and tC appear.
2 Press the <RUN/ENTER> key.
3 Press the <CAL> key repeatedly until nLF appears on the dis-
play.
4 To return to the measuring mode: Press the <M> key. From
now on, nLF will be used for the temperature compensation.
nLF is displayed on the display.
OUpH
L
F
C
E
Store
RCL
AR
Auto
AutoCal DIN
AutoCalTEC
LoBat
Cal
ARng
Tref25
Tref20
Lin
nLF
Sal
%
mg/l
mV/pH
cm
°
°
TP
m
S/
cm
cm
1/
F
C
%
/
K
M
TDS
Sal
8
1
S
mbar
Time
Baud
Day.Month No.
Ident
Year
C
t
mg/l
AR
Store
OSal
TDS
°
C
TP
/
K
cm
1/
°
F
%
8
1
RCL
LoBat
Cal
Tref20
Lin
m
M
S
Auto
Sal
mbar
%
UpH
mV/pH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
F
L
n
8
4
6
nLF
Tref25
ARng
S/
cm
1 Press the <CAL> key repeatedly until tc appears on the dis-
play.
Operation handylab pH/LF 12
44
2 Press the <RUN/ENTER> key.
3 Press the <CAL> key repeatedly until the adjustable linear
temperature coefficient (%/K) appears on the display.
4 Set the temperature coefficient with <> <
> , e.g. 1.880 %/K.
5 To return to the measuring mode: Press the <M> key. From
now on, the adjusted linear temperature coefficient will be used
for the temperature compensation. Lin is displayed on the display.
OUpH
L
F
C
E
Store
RCL
AR
Auto
AutoCal DIN
AutoCalTEC
LoBat
Cal
ARng
Tref25
Tref20
Lin
nLF
Sal
%
mg/l
mV/pH
cm
°
°
TP
m
S/
cm
cm
1/
F
C
%
/
K
M
TDS
Sal
8
1
S
mbar
Time
Baud
Day.Month No.
Ident
Year
C
t
S
nLF
TP
C
°
F
cm
1/
Cal
LoBat
Tref20
RCL
AR
°
M
%
mg/l
mV/pH
m
Sal
TDS
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
0
20
0
2
4
2
S/
cm
Tref25
ARng
%
/
K
Lin
1
S
nLF
TP
C
°
F
cm
1/
Cal
LoBat
Tref20
RCL
AR
°
M
%
mg/l
mV/pH
m
Sal
TDS
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
0
18
8
2
4
2
S/
cm
Tref25
ARng
%
/
K
Lin
1
handylab pH/LF 12 Operation
45
Switching the tempera-
ture compensation off
You can switch off the temperature compensation as follows:
1 Press the <CAL> key repeatedly until tc appears on the dis-
play.
2 Press the <RUN/ENTER> key.
3 Press the <CAL> key repeatedly until four bars appear in the
lower line of the display.
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.
OUpH
L
F
C
E
Store
RCL
AR
Auto
AutoCal DIN
AutoCalTEC
LoBat
Cal
ARng
Tref25
Tref20
Lin
nLF
Sal
%
mg/l
mV/pH
cm
°
°
TP
m
S/
cm
cm
1/
F
C
%
/
K
M
TDS
Sal
8
1
S
mbar
Time
Baud
Day.Month No.
Ident
Year
C
t
nLF
Cal
Tref20
Tref25
Lin
TP
C
°
%
/
K
S
F
cm
1/
LoBat
RCL
AR
°
M
%
mg/l
mV/pH
m
Sal
TDS
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCal TEC
Time
Baud
Day.Month No.
Ident
Year
-
--
-
2
4
2
S/
cm
ARng
1
Operation handylab pH/LF 12
46
4.5 Calibration intervals (Int 3, Int 5)
For each measured variable, a time interval is stored. When it has expired, you will be reminded to calibrate. After a calibration interval has
expired, the probe symbol of the relevant measured variable flashes. It
is still possible to measure. By calibrating the relevant probe, the function is reset and the interval starts anew.
The following calibration intervals are set in the factory:
Setting the calibration
interval
You can change each of these intervals (1 ... 999 days):
Measured
parameter
Designation Default setting
pH/ORP Int 3 7 days (d 7)
Conductivity Int 5 180 days (d 180)
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. After this, the
measuring instrument automatically switches over to configuration.
4 Press the <RUN/ENTER> key repeatedly until Int 3 or Int 5 and
the required measured variable pH or appears. Example:
5 Set the required interval (in days) until the next calibration with
<
> <>.
6 Confirm with <RUN/ENTER>.
7 Switch to the measuring mode with <M>.
O
8
1
°
C
TP
ARng
mg/l
LoBat
Baud
Day.Month No.
Ident
Year
Sal
%
mbar
S
RCL
AR
Store
Auto
°
F
1/
cm
/
K
%
TDS
Sal
mV/pH
S/
m
cm
cm
M
Lin
Tref25
Tref20
nLF
AutoCal DIN
AutoCalTEC
7
t
3
n
1
d
Time
Cal
pH
handylab pH/LF 12 Operation
47
4.6 Saving
The measuring instrument has an internal data memory. It can store up
to 500 data records.
A complete data record consists of:
l Number of the storage location
l Date/time
l Measured values of the probes connected
l Temperature
l Temperature measuring procedure
l ID number
You can transmit measured values (data records) to the data storage
in two ways:
l Save manually
l Switch on AutoStore (Int 1), (see page 49).
4.6.1 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.
2 Confirm with <RUN/ENTER>.
The display switches to entering the ID number.
%
OU
TP
°
C
7
1
m
Sal
mg/l
8
LoBat
Time
Baud
Day.Month
Ident
Year
Sal
mbar
1
S
RCL
AR
Auto
Cal
°
F
1/
cm
/
K
%
TDS
mV/pH
S/
cm
cm
M
Lin
Tref25
Tref20
nLF
AutoCal DIN
AutoCalTEC
4
9
9
6
ARng
No.
Store
pH
Operation handylab pH/LF 12
48
Message StoFull
StoFullStoFull
StoFull This message appears when all of the 500 storage locations are occu-
pied.
You have the following options:
3 Using <> <>, set the required ID number
(1 ... 999).
4 Confirm with <RUN/ENTER>.
The measured values are stored. The instrument changes to
the measuring mode.
No.
ARng
%
OU
TP
°
C
7
1
m
Sal
mg/l
8
LoBat
Time
Baud
Day.Month
Year
Sal
mbar
1
S
RCL
AR
Auto
Cal
°
F
1/
cm
/
K
%
TDS
mV/pH
S/
cm
cm
M
Lin
Tref25
Tref20
nLF
AutoCal DIN
AutoCalTEC
2
9
9
6
Store
pH
Ident
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 4.6.3
Clearing the memory see
section 4.6.4
handylab pH/LF 12 Operation
49
4.6.2 Switching on AutoStore (Int 1)
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 internal 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.
3 Set the required interval between the saving procedures with
<
> <> (Selection: 5 s, 10 s, 30 s, 1 min, 5 min, 10 min,
15 min, 30 min, 60 min).
4 Confirm with <RUN/ENTER>.
The number of free memory locations appears on the display.
5 Confirm with <RUN/ENTER>.
The prompt for the ID number appears on the display.
LoBat
Tref25
nLF
/
K
%
RCL
Sal
°
AR
TP
C
M
m
%
mg/l
cm
S/
cm
S
8
cm
1/
°
F
ARng
Cal
Lin
Tref20
Sal
TDS
mbar
OUpH
mV/pH
AutoCal DIN
AutoCalTEC
Time
Baud
Day.Month No.
Ident
Year
F
F
O
t
1
n
1
Store
Auto
S
1
LoBat
Tref25
nLF
/
K
%
RCL
Sal
°
AR
TP
C
M
m
%
mg/l
cm
S/
cm
cm
1/
°
F
ARng
Cal
Lin
Tref20
Sal
TDS
mbar
OUpH
mV/pH
AutoCal DIN
AutoCalTEC
Time
Baud
Day.Month No.
Ident
Year
e
e
r
9
9
4
Store
Auto
F
Operation handylab pH/LF 12
50
As soon as all of the 500 storage locations are occupied, AutoStore is
terminated (Int 1 = OFF). If there are not enough storage locations
available for your measurements:
l Output and backup the data storage (see page 51) and
l Clear the memory (see page 56).
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:
l setting the save interval (Int 1) to OFF, or
l switching the measuring instrument off and then on again.
6 Set the required ID number with <> <>.
7 Confirm with <RUN/ENTER>.
The measuring instrument switches to the last active measuring mode and starts the measuring and saving procedure. AutoStore flashes on the display.
e
r
F
9
9
9
S
1
LoBat
Tref25
nLF
/
K
%
RCL
Sal
°
AR
TP
C
M
m
%
mg/l
cm
S/
cm
cm
1/
°
F
ARng
Cal
Lin
Tref20
Sal
TDS
mbar
OUpH
mV/pH
AutoCal DIN
AutoCalTEC
Time
Baud
Day.Month No.
Year
1
Store
Auto
Ident
handylab pH/LF 12 Operation
51
4.6.3 Outputting the data storage
You can output the contents of the data storage:
l Stored data on the display
l Calibration data on the display
l Stored data on the serial interface
l Calibration protocol to the interface
Outputting stored data
on the display
You can perform the following activities:
1 Press the <RCL> key repeatedly until StO dISP appears on the
display.
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.
Display further data of the data record
(ID number, date, time, storage location)
Press <RUN/ENTER>
Toggle between two saved measured
variables
Press <RUN/ENTER>
+ <M>
Advance one data record
(storage location)
Press <
>
Go back one data record (storage location) Press <
>
ARng
ConCal
Store
Auto
0
No.
LoBat
Day.Month
Year
Ident
UpH
AR
%
°F
°C
TP
mV/pH
mol/L
TempError
AutoCal DIN
CalError
AutoCal TEC
Time
Baud
1
S
mg/L
% ppm
ISE
Os
T
pi
s
RCL
d
AR
Store
No.Day.Month
Year
Ident
ARng
%
OU
m
Sal
mg/l
8
LoBat
Time
Baud
Sal
mbar
1
S
Auto
Cal
°
F
1/
cm
/
K
%
TDS
mV/pH
S/
cm
cm
M
Lin
Tref25
Tref20
nLF
AutoCal DIN
AutoCalTEC
8
8
8
6
pH
RCL
TP
2
4
°
C
Operation handylab pH/LF 12
52
Note
If you want to search for a certain element of the data record (e.g. date),
proceed as follows:
Outputting stored data
to the interface
Note
You can cancel the transmission with <M> or <RUN/ENTER>.
The transmitted data contains the entire contents of the storage in incrementing order of the location numbers.
1 Using <RUN/ENTER>, select the element (e.g. date).
2Press <
> or <> repeatedly until the required element ap-
pears 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.
2 Press the <RUN/ENTER> key.
The complete contents of the storage are transmitted to the interface. During the data transmission the instrument increments the storage numbers. After the data transmission, the
instrument automatically switches to the last active measurement mode.
d
ARng
ConCal
Store
Auto
0
No.
LoBat
Day.Month
Year
Ident
UpH
AR
%
°F
°C
TP
mV/pH
mol/L
TempError
AutoCal DIN
CalError
AutoCal TEC
Time
Baud
1
S
mg/L
% ppm
ISE
Os
T
RS
e
RCL
handylab pH/LF 12 Operation
53
Sample printout:
Outputting the
calibration data
on the display
No. 1:
09.03.99 17:10
pH 10.01 25 °C
Tman AR
Ident : 1
No. 2:
09.03.99 17:11
pH 10.01 24.7 °C
Tauto AR
Ident : 1
No. 3:
09.03.99 17:12
305.2 mV
Tauto
Ident : 13
...
1 Press the <RCL> key repeatedly until CAL disp appears on the
display.
2 Press the <RUN/ENTER> key.
The data of the last calibration of all measured variables appears in the following sequence:
l pH: Slope SLO and asymmetry ASY
l Conductivity: Cell constant C
Information concerning the calibration procedure is output as
well.
Store
Auto
Ident
S
1
LoBat
Tref25
nLF
/
K
%
Sal
°
AR
TP
C
M
m
%
mg/l
cm
S/
cm
cm
1/
°
F
ARng
Cal
Lin
Tref20
Sal
TDS
mbar
OUpH
mV/pH
AutoCal DIN
AutoCalTEC
Time
Baud
Day.Month No.
Year
d
P
C
A
L
I
S
RCL
Operation handylab pH/LF 12
54
3 Press <RUN/ENTER> to display the value of the asymmetry
(mV).
4 Press <RUN/ENTER> to display the cell constant. The dis-
played value is:
l the current, calibrated cell constant (with sensor symbol on
the display) or
l the fixed cell constant 0.475 1/cm (without sensor symbol
on the display). In this case, the measuring parameters are
initialized (see section 4.9 R
ESET).
5 With <M> you can switch back to the last active measuring
mode.
Sal
cm
AutoCal DIN
Day.Month
S
Tref20
Cal
Ident
No.
Year
Time
Baud
1
TDS
Sal
Store
AR
Tref25
cm
C
/
%
K
TP
°
M
mbar
1/
%
m
mg/l
cm
S/
Lin
OU
nLF
AutoCalTEC
Auto
LoBat
ARng
°
F
O
9
4
pH
L
S
RCL
5
mV/pH
Sal
cm
AutoCal DIN
Time
Day.Month
Sal
Store
AR
8
No.
Ident
Tref20
Tref25
Year
Baud
cm
C
/
%
K
TP
°
M
mbar
1/
%
m
mg/l
cm
S/
TDS
6
Lin
Cal
1
S
OU
nLF
AutoCalTEC
Auto
LoBat
ARng
°
F
Y
0
1
pH
mV
S
A
RCL
L
C
S
1
LoBat
Lin
nLF
Tref20
ARng
AR
°
°
TP
F
C
%
/
K
M
%
mg/l
mV/pH
m
S/
cm
Sal
TDS
Auto
Store
Sal
mbar
OUpH
cm
AutoCal DIN
AutoCalTEC
Time
Baud
Day.Month No.
Ident
Year
2
07
4
cm
1/
Tref25
RCL
C
Cal
handylab pH/LF 12 Operation
55
Outputting the calibra-
tion protocol on the
interface
Sample printout:
1 Press the <RCL> key repeatedly until CAL SEr appears on the
display.
2 Press the <RUN/ENTER> key.
The calibration protocol for all measured variables is transmitted to the interface. After the data transmission, the instrument
automatically switches to the last active measurement mode.
d
Store
Auto
Ident
S
1
LoBat
Tref25
nLF
/
K
%
Sal
°
AR
TP
C
M
m
%
mg/l
cm
S/
cm
cm
1/
°
F
ARng
Cal
Lin
Tref20
Sal
TDS
mbar
OUpH
mV/pH
AutoCal DIN
AutoCalTEC
Time
Baud
Day.Month No.
Year
R
C
A
L
S
E
RCL
CALIBRATION PROTOCOL
02.03.01 14:19
Device No.: 12345678
Calibration pH
Cal time: 01.10.01 / 15:20
Cal interval: 7d
AutoCal TEC Tauto
Buffer 1 2.00
Buffer 2 4.01
Buffer 3 7.00 *
Buffer 4 10.01
C1 174.1 mV 25.0°C
C2 -133.3 mV 25.0°C
S1 -59.4 mV/pH
ASY1 - 4 mV
Probe: +++
Calibration Conductivity
Cal time: 14.12.00 / 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
Operation handylab pH/LF 12
56
4.6.4 Clearing the memory
With this function, you can delete stored data records. 500 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 last active measuring mode.
Proceed as follows to clear all data records:
Note
The calibration data remain stored and can be called up.
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.
4 Confirm the clearing process with <RUN/ENTER>.
Pressing any other key prevents the clearing, the data records
will remain stored.
handylab pH/LF 12 Operation
57
4.7 Transmitting data
You have the following possibilities of transmitting data:
l One of the following options:
– With the AutoStore function (page 49), 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).
l With the Output data storage function (page 51), calibration data or
saved measured values are output on the interface.
4.7.1 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
The setting of the interval (Int 2) is only effective if the save interval
(AutoStore function) is switched off!
Setting the
Data transmission
interval
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.
3 Set the required interval between the saving procedures with
<
> <>.
Store
Auto
LoBat
Tref25
nLF
/
K
%
RCL
Sal
°
AR
TP
C
M
m
%
mg/l
cm
S/
cm
S
8
cm
1/
°
F
ARng
Cal
Lin
Tref20
Sal
TDS
mbar
OUpH
mV/pH
AutoCal DIN
AutoCalTEC
Time
Baud
Day.Month No.
Ident
Year
F
F
O
t
2
n
1
Operation handylab pH/LF 12
58
Note
When the AutoStore function is active at the same time, 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 in-
terval (Int 2).
4.7.2 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.
Warning
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:
Socket assignment
4 Confirm with <RUN/ENTER>.
The measuring instrument switches to the last active measuring mode.
Baud rate selectable between: 1200, 2400, 4800, 9600
Handshake RTS/CTS + Xon/Xoff
Parity none
Data bits 8
Stop bits 2
Cable length Max. 15 m
1
CTS
2 RxD
3 Ground
4TxD
1
2
3
4
RS 232
REC
handylab pH/LF 12 Operation
59
4.7.3 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.
Operation handylab pH/LF 12
60
4.8 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):
Note
You can leave the configuration menu at any time with <M>. The pa-
rameters that have already been changed are stored.
Baudrate
Baud rate 1200, 2400, 4800, 9600
Display during the
pH calibration
Buffer nominal value, or current
electrode voltage
Intervals
Calibration (Int 3)
in days (d)
– pH: 1 ... 7 ... 999 d Int 3
– : 1 ... 180 ... 999 d Int 5
Reference temperature – 25 °C (TREF25) t25
– 20 °C (TREF20) t20
Date/time Any
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.
4 Select the required Baud rate with <> <>.
5 Confirm with <RUN/ENTER>. CAL dISP appears on the dis-
play.
Day.Month No.
Time
1
2
M
m
%
mg/l
cm
S/
cm
S
mbar
mV/pH
t
n
Store
Auto
LoBat
Tref25
nLF
/
K
%
RCL
Sal
°
AR
TP
C
cm
1/
°
F
ARng
Cal
Lin
Tref20
Sal
TDS
OUpH
AutoCal DIN
AutoCalTEC
Ident
Year
0
0
8
4
Baud
handylab pH/LF 12 Operation
61
Calibration
intervals pH
6 Select the required display during the pH calibration with
<
> <>.
mV: Display of the current electrode voltage
/pH: Display of the buffer nominal value.
7 Confirm with <RUN/ENTER>. On the display, Int 3 appears.
RCL
mV/pH
O
Store
Auto
Ident
S
1
LoBat
Tref25
nLF
/
K
%
Sal
°
AR
TP
C
M
m
%
mg/l
cm
S/
cm
cm
1/
°
F
ARng
Cal
Lin
Tref20
Sal
TDS
mbar
AutoCal DIN
AutoCalTEC
Time
Baud
Day.Month No.
Year
p
C
A
L
i
sd
pH
/pH
8 Set the required interval (in days) with <> <>.
9 Confirm with <RUN/ENTER>. Int 5 and the measured variable
appears on the display.
10 Set the required interval (in days) with <> <>.
1
OU
°
C
1
TP
ARng
mg/l
LoBat
Baud
Day.Month No.
Ident
Year
Sal
%
mbar
S
RCL
AR
Store
Auto
°
F
1/
cm
/
K
%
TDS
Sal
mV/pH
S/
m
cm
cm
M
Lin
Tref25
Tref20
nLF
AutoCal DIN
AutoCalTEC
8
t
3
n
1
d
Time
Cal
pH
O
°
C
TP
ARng
mg/l
LoBat
Baud
Day.Month No.
Ident
Year
Sal
%
mbar
S
RCL
AR
Store
Auto
°
F
1/
cm
/
K
%
TDS
UpH Sal
mV/pH
S/
m
cm
cm
M
Lin
Tref25
Tref20
nLF
AutoCal DIN
AutoCalTEC
0
8
t
5
n
1
d
Time
Cal
1
Operation handylab pH/LF 12
62
Switching over the
reference temperature
Date and time
11 Confirm with <RUN/ENTER>. The reference temperature set
for conductivity measurements appears on the display.
12 Using <> <>, toggle between t20 and t25.
13 Confirm with <RUN/ENTER>.
The date flashes on the display.
RCL
AR
ARng
Sal
/
K
%
TP
C
°
°
F
cm
1/
M
cm
mbar
S
E
Y
SalO
Store
1
S
m
%
mg/l
S/
cm
mV/pH
Baud
4
Day.Month No.
Time
Auto
LoBat
nLF
Cal
Lin
Tref20
TDS
UpH
AutoCal DIN
AutoCalTEC
Ident
Year
5
2
t
Tref25
14 Set the date of the current day with <> <>.
15 Confirm with <RUN/ENTER>.
The date (month) flashes on the display.
16 Set the current month with <> <>.
17 Confirm with <RUN/ENTER>.
The year appears on the display.
18 Set the current year with <> <>.
19 Confirm with <RUN/ENTER>.
The hours flash on the display.
20 Set the current time with <> <>.
S
1
M
m
%
mg/l
cm
S/
cm
mbar
mV/pH
D
i
s
Store
Auto
Ident
LoBat
Tref25
nLF
/
K
%
Sal
°
AR
TP
C
cm
1/
°
F
ARng
Cal
Lin
Tref20
Sal
TDS
OUpH
AutoCal DIN
AutoCalTEC
Time
Baud
No.
Year
4
0
9
0
Day.Month
handylab pH/LF 12 Operation
63
21 Confirm with <RUN/ENTER>.
The minutes flash on the display.
22 Set the current time with <> <>.
23 Confirm with <RUN/ENTER>.
The measuring instrument switches to the last active measuring mode.
Operation handylab pH/LF 12
64
4.9 Reset
You can reset (initialize) the measurement parameters and the configuration parameters separately from one another.
Measurement
parameters
The following measuring parameters are reset to the delivery status:
pH
Conductivity
Note
The calibration data gets lost when the measuring parameters are reset. Recalibrate after performing a reset.
Configuration
parameters
The following configuration parameters (InI) are reset to the delivery
status:
Measuring mode pH
Slope -59.16 mV/pH
Asymmetry 0 mV
Manual temperature input 25 °C
Measuring mode
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
Baud rate 4800
Display during the
pH calibration
Buffer nominal value
Interval 1
(automatic save) OFF
Interval 2
(for data transmission) OFF
handylab pH/LF 12 Operation
65
Resetting the
measuring parameters
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <CAL> key. The setting to reset the pH measuring
parameters appears on the display.
3 Using <> <>, toggle between no and YES.
YES: Resetting the pH measuring parameters
no: Retaining settings.
4 Confirm with <RUN/ENTER>.
The measuring instrument switches to the setting to reset the
conductivity measuring parameters.
5 Using <> <>, toggle between no and YES.
YES: Resetting the conductivity measuring parameters.
no: Retaining settings.
6 Confirm with <RUN/ENTER>.
The measuring instrument switches to the configuration parameters.
O
ARng
Y
Sal
Sal
/
K
%
TP
C
°
°
F
Store
cm
1/
1
S
M
m
%
mg/l
cm
S/
cm
mV/pH
mbar
Baud
4
Day.Month No.
Time
Auto
LoBat
Tref25
nLF
RCL
AR
Cal
Lin
Tref20
TDS
AutoCal DIN
AutoCalTEC
Ident
Year
o
n
I
n
I
pH
OpH
Tref25
Tref20
AutoCalTEC
RCL
LoBat
Cal
ARng
AR
Lin
nLF
Store
Sal
°
°
TP
cm
1/
F
C
%
/
K
8
8
1
S/
cm
m
M
TDS
Sal
S
Auto
mbar
%
mg/l
mV/pH
cm
AutoCal DIN
Time
Baud
Day.Month No.
Ident
Year
o
n
n
I
I
Operation handylab pH/LF 12
66
Resetting the
configuration parame-
ters
7 Using <> <>, toggle between no and YES.
YES: Resetting the configuration parameters
no: Retaining settings.
8 Confirm with <RUN/ENTER>.
The measuring instrument automatically switches to the last
active measuring mode.
OpH
Tref25
Tref20
AutoCalTEC
RCL
LoBat
Cal
ARng
AR
Lin
nLF
Store
Sal
°
°
TP
cm
1/
F
C
%
/
K
8
8
1
S/
cm
m
M
TDS
Sal
S
Auto
mbar
%
mg/l
mV/pH
cm
AutoCal DIN
Time
Baud
Day.Month No.
Ident
Year
o
n
n
I
I
handylab pH/LF 12 Maintenance, cleaning, disposal
67
5 Maintenance, cleaning, disposal
5.1 Maintenance
The measuring instrument is almost maintenance-free.
The only maintenance task is replacing the batteries.
LoBat on the display indicates that the batteries should be changed.
The batteries are then largely depleted.
Replacing the batteries
Warning
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 bat-
tery compartment. Only use leakproof alkaline manganese batteries.
1 Open the housing after the instrument has been switched off:
– Undo the four screws on the underside of the instrument
– Pull down the lower cover (1).
2 If necessary, take the four depleted batteries (2) out of the bat-
tery compartment.
3 Place four new batteries (type Mignon AA) in the battery com-
partment.
4 Close the lower cover (1).
1
2
Maintenance, cleaning, disposal handylab pH/LF 12
68
Note
For maintenance of electrodes and measuring cells, follow the corresponding operating manual.
5.2 Cleaning
Occasionally wipe the outside of the measuring instrument with a
damp, lint-free cloth. Disinfect the housing with isopropanol as required.
Warning
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 Re-
public of Germany. We would ask end-consumers in other countries to
follow their local statutory provisions.
Note
This instrument contains batteries. Batteries that have been removed
must only be disposed of at the recycling facility set up for this purpose
or via the retail outlet.
It is illegal to dispose of them in household refuse.
Measuring instrument Dispose of the measuring instrument as electronic waste at an appro-
priate collection point. It is illegal to dispose of the instrument in household refuse.
handylab pH/LF 12 What to do if...
69
6 What to do if...
6.1 pH system messages
Error message 0FL
0FL0FL
0FL
Error message E3
E3E3
E3
Cause Remedy
pH electrode:
– Not connected – Connect electrode
– Air bubble in front of the
diaphragm
– Remove air bubble
– Air in the diaphragm – Extract air or
moisten diaphragm
– Cable broken – Replace electrode
– Gel electrolyte dried out – Replace electrode
Cause Remedy
Electrode
– Diaphragm contaminated – Clean diaphragm
– Membrane contaminated – Clean membrane
– Moisture in the plug – Dry plug
– Electrolyte out of date – Replenish electrolyte or
replace electrode
– Electrode worn out – Replace electrode
– Electrode broken – Replace electrode
Measuring instrument:
– Incorrect calibration procedure – Select correct procedure
– Incorrect solution temperature
(without temperature probe)
– Set up correct temperature
– Socket damp – Dry socket
What to do if... handylab pH/LF 12
70
No stable measured
value
Obviously incorrect
measured values
Buffer solutions
– Incorrect buffer solutions – Change calibration procedure
– Buffer solutions too old – Use only once.
Note the shelf life
– Buffer solutions depleted – Change solutions
Cause Remedy
pH electrode:
– Diaphragm contaminated – Clean diaphragm
– Membrane contaminated – Clean membrane
Test sample:
– pH value not stable – Measure with air excluded if
necessary
– Temperature not stable – Adjust temperature if
necessary
Electrode + test sample:
– Conductivity too low – Use suitable electrode
– Temperature too high – Use suitable electrode
– Organic liquids – Use suitable electrode
Cause Remedy
pH electrode:
– pH electrode unsuitable – Use suitable electrode
– Temperature difference
between buffer and test
sample too high
– Adjust temperature of buffers
or test samples
– Measurement procedure not
suitable
– Follow special procedure
handylab pH/LF 12 What to do if...
71
6.2 Conductivity system messages
Error message OFL
OFLOFL
OFL
Error message E3
E3E3
E3
6.3 General errors
Display LoBat
Instrument does not
react
to keystroke
Display to
toto
to
Probe symbol flashes
Cause Remedy
The measured value lies outside
the measuring range
– Measuring cell not connected – Connect measuring cell
– Cable broken – Replace measuring cell
Cause Remedy
– Measuring cell contaminated – Clean cell and replace it if
necessary
– Unsuitable calibration
solution
– Check calibration solutions
Cause Remedy
– Batteries almost empty – Exchange the batteries (see
section 5.1 M
AINTENANCE)
Cause Remedy
– Operating condition undefined
or EMC load unallowed
– Processor reset:
Switch the instrument on
while pressing the <CAL> key
Cause Remedy
– Time-out of the interface – Check the instrument that is
connected
Cause Remedy
– Calibration interval expired – Recalibrate the measuring
system
What to do if... handylab pH/LF 12
72
Message StoFull
StoFullStoFull
StoFull
Cause Remedy
– All memory locations are full – Output data storage and clear
data storage
handylab pH/LF 12 Lists
73
7Lists
This chapter provides additional information and orientation aids.
Abbreviations The list of abbreviations explains the indicators and the abbreviations
that appear on the display and in the manual.
Specialist terms The glossary briefly explains the meaning of the specialist terms. How-
ever, terms that should already be familiar to the target group are not
described here.
Index The index will help you to find the topics that you are looking for.
Lists handylab pH/LF 12
74
Abbreviations
Conductivity value (international
γ)
AR AutoRead (drift control)
ARng Automatic range switching
Measuring instrument measures with highest resolution
ASY Asymmetry
AutoCal DIN Automatic pH calibration with buffer solutions pre-
pared according to DIN 19 266
AutoCal TEC Automatic pH calibration with SCHOTT technical
buffer solutions according to DIN 19267
C Cell constant [cm
-1
] (internat. k)
°C Temperature unit, degrees Celsius
Cal Calibration
ConCal Conventional single-point or two-point calibration
for pH measurements
Ct... Display indicator during calibration for pH mea-
surements. Indicates the selection of the buffer
data records for SCHOTT technical buffer solutions
E3 Error message
see chapter 6 W
HAT TO DO IF...
InI Initialization
Resets individual basic functions to the status they
had on delivery
Lin Linear temperature compensation
LoBat Batteries almost empty(Low Battery)
mV Voltage unit
mV/pH Unit of the electrode slope (internat. mV)
nLF Nonlinear temperature compensation
OFL Display range exceeded (Overflow)
pH pH value
S Slope (internat. k)
SAL Salinity
handylab pH/LF 12 Lists
75
SELV Safety Extra Low Voltage
SLO Slope setting on calibration
TC Temperature coefficient (internat.
α)
TP Temperature measurement active (Temperature
Probe)
T
Ref
20/T20 Reference temperature of 20 °C
T
Ref
25/T25 Reference temperature of 25 °C
U
ASY
Asymmetry
Lists handylab pH/LF 12
76
Glossary
Adjusting To manipulate a measuring system so that the relevant value (e. g. the
displayed value) differs as little as possible from the correct value or
a value that is regarded as correct, or that the difference remains within the tolerance.
Asymmetry Designation for the offset potential of a pH electrode. It is the measur-
able potential of a symmetrical electrode, the membrane of which is
immersed in a solution with the pH of the nominal electrode zero point
(electrodes: pH = 7).
AutoRange Name of the automatic selection of the measuring range.
AutoRead Name for a function to check the stability of the measured value.
Calibration Comparing the value from a measuring system (e. g. the displayed
value) to the correct value or a value that is regarded as correct. Often, this expression is also used when the measuring system is adjusted at the same time (see adjusting).
Cell constant, k Characteristic quantity of a conductivity measuring cell, depending on
the geometry.
Conductivity Short form of the expression, specific electrical conductivity. It is a
measured value of the ability of a substance to conduct an electric current. In water analysis, the electrical conductivity is a dimension for the
ionized substances in a solution.
Conductometry Name of the conductivity measuring technique.
Diaphragm The junction is a porous body in the housing wall of reference elec-
trodes or electrolyte bridges. It forms the electrical contact between
two solutions and makes electrolyte exchange more difficult. The expression, junction, is also used for ground or junction-less transitions.
Electrode zero point The zero point of a pH electrode is the pH value at which the electro-
motive force of the pH electrode at a specified temperature is zero.
Normally, this is at 25 °C.
Electromotive force of
an electrode
The electromotive force U of the electrode is the measurable electromotive force of an electrode in a solution. It equals the sum of all the
galvanic voltages of the electrode. Its dependency on the pH results
in the electrode function which is characterized by the parameters,
slope and zero point.
Measured parameter The measured parameter is the physical dimension determined by
measuring, e. g. pH, conductivity or D. O. concentration.
Measured value The measured value is the special value of a measured parameter to
be determined. It is given as a combination of the numerical value and
unit (e. g. 3 m; 0.5 s; 5.2 A; 373.15 K).
handylab pH/LF 12 Lists
77
Measuring system The measuring system comprises all the devices used for measuring,
e. g. measuring instrument and probe. In addition, there is the cable
and possibly an amplifier, terminal strip and armature.
Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol-
vent.
MultiCal
®
Name stating that a measuring instrument provides several calibration
procedures.
Offset potential The measurable potential of a symmetrical electrode, the membrane
of which is immersed in a solution with the pH of the nominal electrode
zero point. The asymmetry is part of the offset potential.
ORP voltage The ORP is caused by oxidizing or reducing substances dissolved in
water if these substances become effective on an electrode surface
(e. g. a gold or platinum surface).
pH value The pH is a measure of the acidic or basic effect of an aqueous solu-
tion. It corresponds to the negative decadic logarithm of the molal hydrogen ions activity divided by the unit of the molality. The practical pH
value is the value of a pH measurement.
Potentiometry Name of a measuring technique. The signal (depending on the mea-
sured parameter) of the electrode is the electrical potential. The electrical current remains constant.
Reference
temperature
Fixed temperature value to compare temperature-dependent measured values. For conductivity measurements, the measured value is
converted to a conductivity value at a reference temperature of 20 °C
or 25 °C.
Reset Restoring the original condition of all settings of a measuring system.
Resistance Short name for the specific electrolytic resistance. It corresponds to
the reciprocal value of the electrical conductivity.
Resolution Smallest difference between two measured values that can be dis-
played by a measuring instrument.
Salinity The absolute salinity S
A
of seawater corresponds to the relationship
of the mass of dissolved salts to the mass of the solution (in g/Kg). In
practice, this dimension cannot be measured directly. Therefore, the
practical salinity is used for oceanographic monitoring. It is determined by measuring the electrical conductivity.
Salt content General designation for the quantity of salt dissolved in water.
Slope The slope of a linear calibration function.
Standard solution The standard solution is a solution where the measured value is
known by definition. It is used to calibrate a measuring system.
Lists handylab pH/LF 12
78
Temperature
coefficient
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 behav-
ior of a test sample, a probe or part of a probe.
Test sample Designation of the sample ready to be measured. Normally, a test
sample is made by processing the original sample. The test sample
and original sample are identical if the test sample was not processed.
handylab pH/LF 12 Index
79
Index
A
Asymmetry 23
Authorized use 13
AutoCal DIN 23, 29
AutoCal TEC 23, 25
AutoRead 20, 38
C
Calibration evaluation 24, 40
Calibration interval 46
Calibration procedures 23
Calibration protocol
Conductivity
39
Calibration protocol (340i) 23
Cell constant 36, 39
ConCal 23, 32
Conductivity 37
Connecting a printer 58
Connecting the original plugin power supply unit
16
D
Data record 47
Data transmission (interval)
57
Delivery status 64
Display 7
Displaying calibration data
39
Drift control 20, 38
E
Energy saving feature 17
Error messages 71
I
Initial commissioning 15
Initialization 64
Interval
calibration
46
data transmission 57
save 49
K
Keys 6
L
Linear
Temperature compensa-
tion
42
temperature compensa-
tion
43
M
Measuring 35
Measuring mode when
switching on
17
Measuring ranges
pH/ORP
9
N
Nonlinear
Temperature compensa-
tion
42
temperature compensa-
tion
43
O
Operating 8
Operating safety 14
ORP electrode 22
ORP voltage 22
P
Printing
calibration protocol
23
R
Reference temperature (conductivity)
35
Remote control 59
Replacing the batteries 67
Reset 64
Resetting the measuring parameters
65
RS232 interface 58
S
Safety 13
safety precautions 13
Salinity 37
Save interval 49
Scope of delivery 15
Setting the baud rate 60
Setting the date 15, 62
Setting the reference temperature
62
Setting the time 15, 62
single-point calibration 23
Single-point calibration (pH)
23, 27, 30, 32
Slope 23
T
Temperature compensation
42, 45
linear 42
nonlinear 42
Temperature compensation
(conductivity)
35
Temperature probe
Conductivity
35
pH 19
Two-point calibration
ConCal
32
two-point calibration 23
Two-point calibration (pH)
23, 27, 30, 32
Index handylab pH/LF 12
80
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