SCHOTT handylab pH 12 User manual

ba75368e01 01/2003
ba75368e
handylab pH 12
Operating manual
pH measuring instrument
AR
pH
O
RCL
STO
CAL
PH
6
4
2
992
6
°
C
TP

Accuracy when
going to press The use of advanced technology and the high quality standard of our instruments are the result of continuous development. This may result
in differences between this operating manual and your instrument. Al-
so, we cannot guarantee that there are absolutely no errors in this man-
ual. Therefore, we are sure you will understand that we cannot accept
any legal claims resulting from the data, figures or descriptions.
Warranty We guarantee the instrument described for 3 years from the date of
purchase.
The instrument warranty covers manufacturing faults that are discov-
ered within the warranty period. The warranty does not cover compo-
nents that are replaced during maintenance work, e.g. batteries.
The warranty claim extends to restoring the instrument to readiness for
use but not, however, to any further claim for damages. Improper han-
dling or unauthorized opening of the instrument invalidates any warran-
ty claim.
Copyright ©Mainz, Schott-Geräte GmbH, 2002
Reproduction in whole - or even in part - is prohibited without the ex-
press written permission of Schott-Geräte GmbH, Mainz.
Printed in Germany.

handylab pH 12 List of contents
3
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 12
3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Switching on the measuring instrument . . . . . . . . . . . . . 15
4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . 16
4.2.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 17
4.2.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 19
4.3 Calibrating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.4 Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.2 Saving automatically . . . . . . . . . . . . . . . . . . . . . 36
4.4.3 Outputting the data storage . . . . . . . . . . . . . . . . 38
4.4.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 43
4.5 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.5.1 Data transmission interval (Int 2) . . . . . . . . . . . 44
4.5.2 Recorder (analog output) . . . . . . . . . . . . . . . . . 46
4.5.3 PC/external printer (RS232 interface) . . . . . . . . 47
4.5.4 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.6 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
4.7 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5 Maintenance, cleaning, disposal. . . . . . . . . . . . . . . . . 53
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

List of contents handylab pH 12
4
7 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

handylab pH 12 Overview
5
1Overview
The compact precision handheld meter handylab pH 12 enables you to
carry out pH measurements rapidly and reliably.
The handylab pH 12 provides the maximum degree of operating com-
fort, reliability and measuring certainty for all applications.
The proven calibration procedures and the special AutoRead function
support you in your work with the handylab pH 12.
1Keypad
2Sample display
3Jack field
AR
pH
O
RCL
STO
CAL
PH
6
4
2
992
6
°
C
TP
1
2
3

Overview handylab pH 12
6
1.1 Keypad
Key functions
pH
CAL
STO
RUN/ENTER
AR
RCL
Select the measuring mode <pH>:
–pH value
–ORP voltage
Save a measured value
<STO>
Switch measuring instrument on/off
<ON/OFF>
Calibration of the current 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>
pH
STO
CAL
RCL
AR
RUN/ENTER

handylab pH 12 Overview
7
1.2 Display
1.3 Jack field
Caution
Only connect electrodes to the measuring instrument that cannot return
any voltages or currents that are not allowed
(> SELV and > current circuit with current limiting).
Nearly all electrodes - especially SCHOTT electrodes - fulfill these con-
ditions.
1pH electrode or single-rod measuring electrode
2Reference electrode
3Plug-in power supply (optional)
4Temperature probe
5Serial interface RS 232 / analog output (recorder)
%
°F
S
TempError
mg/L
% ppm
mol/L
ISE
RCL
8
8.
8
888
8
mV/pH
°C
LoBat
AutoCal DIN
CalError
ARng AR
AutoCal TEC
TP
1
UpH
Time
Baud
Day.Month No.
Ident
Year
Auto Store
ConCal
Status display
Meas. value display
Function and
temperature display
Sensor symbol
Ref
5
123
4

Overview handylab pH 12
8
1.4 Technical Data
Dimensions
and weight
Mechanical structure
Electrical safety
Test certificates
Ambient
conditions
pH/ORP measuring
ranges
Precision of
pH/ORP
(± 1 digit)
Length [mm] 172
Width [mm] 80
Height [mm] 37
Weight [kg] Approx. 0.3
Type of protection IP 66
Protective class III
GS, cETLus, CE
Storage - 25 °C ... + 65 °C
Operation -10 °C ... + 55 °C
Relative atmospheric
humidity
< 90 % of annual average
Measuring range Resolution
pH - 2.000 ... + 19.999
- 2.00 ... + 19.99
0.001
0.01
U [mV] - 999.9 ... + 999.9
- 1999 ... + 1999
0.1
1
T [°C] - 5.0 ... + 105.0 0.1
pH
(± 2 pH units from the
calibration point)
± 0.005 at + 15 °C ... + 35 °C
± 0.01
U [mV] ± 0.3 at + 15 °C ... + 35 °C
± 1
T [°C] NTC 30:
Accuracy ± 0.1
PT 1000:
Accuracy Operating temperature
± 0.5 0 °C ... 15 °C
± 0.1 15 °C ... 35 °C
± 1 35 °C ... 55 °C

handylab pH 12 Overview
9
Correction function
Analog output Automatic switchover if a recorder is connected.
Serial interface Automatic switchover if a PC or printer is connected.
Temperature input
Manually [°C] - 20 ... + 130
Output signal Corresponds to the electrode voltage,
i.e. 50-62 mV/pH unit
Accuracy ± 0.1 % of the measured value ± 4 mV
Internal resistance < 5 Ohm (current limited to max. 0.2 mA
output current)
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

Overview handylab pH 12
10
Power supply
Applicable
guidelines and norms
Batteries 4 x 1.5 V alkali-manganese batteries, Type
AA
Operational life Approx. 5000 operating hours
Mains operation The following specifications apply to all plug-
in power supplies:
Max. overvoltage connection 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
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 EC guideline 73/23/EEC
EN 61010-1 A2:1995
Climatic class VDI/VDE 3540
Type of protection EN 60529:1991

handylab pH 12 Safety
11
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the pH meter.
Consequently, all responsible personnel must read this operating man-
ual 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 experi-
ence, the operators will know the necessary safety precautions to take
when handling chemicals.
Safety
instructions The individual chapters of this operating manual use safety instructions such as the label shown below to indicate various hazards or dangers:
Caution
indicates instructions that must be followed precisely in order to avoid
the possibility of slight injuries or damage to the instrument or the envi-
ronment.
Further notes
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating manu-
als.
2.1 Authorized use
The authorized use of the measuring instrument consists exclusively of
the pH and ORP measurement in the field and laboratory.
The technical specifications as given in section 1.4 TECHNICAL DATA
must be observed. Only the operation and running of the measuring in-
strument according to the instructions given in this operating manual is
authorized.
Any other use is considered to be unauthorized.

Safety handylab pH 12
12
2.2 General safety instructions
This instrument is built and inspected according to the relevant guide-
lines and norms for electronic measuring instruments (see section
1.4 TECHNICAL DATA).
It left the factory in a safe and secure technical condition.
Function and operating
safety The smooth functioning and operational safety of the measuring instru- ment can only be guaranteed if the generally applicable safety mea-
sures and the specific safety instructions in this operating manual are
followed during operation.
The smooth functioning and operational safety of the measuring instru-
ment can only be guaranteed under the environmental conditions that
are specified in section 1.4 TECHNICAL DATA.
If the instrument was transported from a cold environment to a warm
environment, the formation of condensate can lead to the faulty func-
tioning of the instrument. In this event, wait until the temperature of the
instrument reaches room temperature before putting the instrument
back into operation.
Safe operation If safe operation is no longer possible, the instrument must be taken out
of service and secured against inadvertent operation!
Safe operation is no longer possible if the measuring instrument:
lhas been damaged in transport
lhas been stored under adverse conditions for a lengthy period of
time
lis visibly damaged
lno longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the instrument.
Obligations of the
purchaser The purchaser of the measuring instrument must ensure that the fol- lowing laws and guidelines are observed when using dangerous sub-
stances:
lEEC directives for protective labor legislation
lNational protective labor legislation
lSafety regulations
lSafety datasheets of the chemical manufacturers.

handylab pH 12 Commissioning
13
3 Commissioning
3.1 Scope of delivery
lHandheld meter, handylab pH 12
lOperating manual and short operating manual
l4 batteries, 1.5 V Mignon type AA (in the instrument)
3.2 Initial commissioning
Perform the following activities:
lSet the date and time
lConnect the plug-in power supply.
Setting the date and
time 1Press the <pH> key and hold it down.
2 Press the <ON/OFF> key.
The display test appears briefly on the display.
3Press the <RUN/ENTER> key repeatedly until the date ap-
pears on the display.
4 Set the date of the current day with <
 > <  >.
5Confirm with <RUN/ENTER>.
The date (month) flashes in the display.
6 Set the current month with <
 > <  >.
7Confirm with <RUN/ENTER>.
The year appears on the display.
8 Set the current year with <
 > <  >.
9Confirm 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 the pH measuring mode.

Commissioning handylab pH 12
14
Connecting the plug-in
power supply (option) You can either operate the measuring instrument with batteries or with the plug-in power supply. The plug-in power supply supplies the mea-
suring 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).
Note
You can also measure without the plug-in power supply.
1Plug 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.
Ref
2
1
3

handylab pH 12 Operation
15
4 Operation
4.1 Switching on the measuring instrument
Note
The measuring instrument has an energy saving feature to avoid un-
necessary battery depletion. The energy saving feature switches the
measuring instrument off if no key has been pressed for an hour. The
energy saving feature is not active when the AutoStore function is ac-
tive.
The energy saving feature is also not active
lif the power is supplied by the plug-in power supply,
lif the communication cable and a PC with a running communication
program are connected,
lif the recorder cable is connected,
lif the printer cable is connected (for external printers).
1Press the <ON/OFF> key.
The display test appears briefly on the display.
Subsequently, the slope and asymmetry used appear for ap-
prox. one second one after the other. In addition, the calibration
procedure of the last calibration is shown (AutoCal TEC or
AutoCal DIN or no display in the delivery state or following ini-
tialization).
The measuring instrument then automatically switches to the
measuring mode that was last selected.

Operation handylab pH 12
16
4.2 Measuring
4.2.1 General information
You can measure the following variables:
lpH value
lORP voltage
Preparatory activities Perform the following preparatory activities when you want to measure:
Caution
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result. The RS232
interface is not galvanically isolated.
Note
Incorrect calibration of pH electrodes leads to incorrect measured val-
ues. Calibrate regularly before measuring.
Temperature sensor You can measure with or without a temperature sensor. If a tempera-
ture sensor is connected, it is indicated on the display by TP.
Note
The measuring instrument automatically recognizes the type of the
temperature sensor used. Therefore, you can connect temperature
sensors of the NTC30 or Pt1000 type.
1Connect the electrode to the measuring instrument.
2 Adjust the temperature of the buffer solutions or test solutions,
or measure the current temperature, if you measure without a
temperature sensor.
3In conjunction with the electrode, check or calibrate the mea-
suring instument. How to calibrate is described in section 4.3.
4 Select the measuring mode with <pH>.

handylab pH 12 Operation
17
The temperature measurement is absolutely essential for a reproduc-
ible pH measurement. If the measurement is made without a tempera-
ture sensor, proceed as follows:
4.2.2 Measuring the pH value
Setting the resolution The measuring instrument shows the pH value with a resolution of 0.01
or 0.001. (Default setting is 0.01). To change the resolution, press the
<pH> key while pressing the <RUN/ENTER> key.
1Measure the current temperature of the test sample using a
thermometer.
2 Enter the temperature on the instrument: Set the temperature
value of the test sample using <
 > <  >.
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the pH electrode in the test sample.
3Press the <pH> key until pH appears on the status display. The
pH value appears on the display.
mV/pH
mol/L
8
Auto Store
TempError
RCL
LoBat
AutoCal DIN
CalError
ARng AR
AutoCal TEC
ConCal
Time
Baud
Day.Month No.
Ident
Year
1
U
%
°F
S
mg/L
% ppm
ISE
8
4
2
299
6
°C
TP
pH

Operation handylab pH 12
18
AutoRead
(drift control) The AutoRead function (drift control) checks the stability of the mea- surement signal. The stability has a considerable impact on the repro-
ducibility of the measured values.
For identical measurement conditions, the following criteria apply:
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
Reproducibility Response time
Better than 0.02 > 30 seconds
1Call up the pH measuring mode with <pH> and <  > <  > .
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
3Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
This measured value is transmitted to the interface.
4 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
5To terminate the AutoRead function: Press the <AR> key.

handylab pH 12 Operation
19
4.2.3 Measuring the ORP voltage
In conjunction with an ORP electrode, e.g. BlueLine 31Rx, the measur-
ing instrument can measure the ORP voltage (U) of a solution.
Note
ORP electrodes are not calibrated. However, you can check ORP elec-
trodes using a test solution.
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the ORP electrode in the test sample.
3Press the <pH> key until U appears on the status display.
The ORP voltage (mV) of the test sample appears on the dis-
play.
4 Wait for a stable measured value.
/pH
ConCal
Auto Store
LoBat
AutoCal DIN
CalError
ARng AR
AutoCal TEC
8
pH
1
%
°F
S
Time
Baud
Day.Month No.
Ident
Year
RCL
TempError
mg/L
% ppm
mol/L
ISE
3
1
2
2
0
mV
°C
U
TP
17

Operation handylab pH 12
20
4.3 Calibrating
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 dis-
played. Calibration determines the current values of the asymmetry
and slope of the electrode and stores them in the measuring instru-
ment.
Thus, you should calibrate at regular intervals.
When to calibrate? lAfter connecting another electrode
lWhen the sensor symbol flashes:
–after the calibration interval has expired
–after a voltage interruption, e. g. after changing the batteries
Calibration interval The calibration interval (Int 3) is set to 7 days in the factory. You can
select the interval in the range of 1 ... 999 days (see section
4.6 CONFIGURATION).
You can select between 3 calibration procedures:
AutoCal TEC is specially adapted to the SCHOTT technical buffer solutions as a fully
automatic two-point or three-point calibration. The buffer solutions
are automatically recognized by the measuring instrument. Depending
on the instrument setting (see section 4.6 CONFIGURATION), the instru-
ment displays the relevant buffer nominal value or the current electrode
voltage in mV. The calibration can be terminated after the first buffer so-
lution. This corresponds to a single-point calibration. For this, 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 DIN19266 as a fully automatic two-point or three-
point calibration. The buffer solutions are automatically recognized by
the measuring instrument. Depending on the instrument setting (see
section 4.6 CONFIGURATION), 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. For this, the instrument uses the Nernst
slope (-59.2 mV/pH at 25 °C) and determines the asymmetry of the
electrode.
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 and is used as a high-speed
method.