wtw pH/Oxi 340i User manual

pH/Oxi 340i
ba52315edfs04 06/2004
ba52315edfs
Operating manual
Bedienungsanleitung
Mode d’emploi
Instrucciones de operación
pH/Oxygen Pocket Meter Page 3
pH/Sauerstoff-Taschenmeßgerät Seite 17
pH/Oxymètre de poche Page 31
Medidor manual pH/oxígeno Página 45
AR
RCL
STO
CAL
M
O
6
7
1
92
7
O
°
C
mg/l
ARng
TP

pH/Oxi 340i
2
Note to this
operating manual This operating manual contains a description of
lall basic functions,
lall instructions for a safe operation, and
lall technical data in a compact form.
A more detailed description with notes for special applications is available as
a pdf document via internet under http://www.WTW.com.
Hinweise zu dieser
Bedienungs-
anleitung
Diese Bedienungsanleitung enthält in kompakter Form
ldie Beschreibung aller Grundfunktionen,
lalle Hinweise für den sicheren Betrieb und
lalle technischen Daten.
Eine ausführlichere Beschreibung mit Hinweisen für besondere Anwendun-
gen ist als pdf-Dokument im Internet unter http://www.WTW.com erhältlich.
Remarque àce
mode d’emploi Ce mode d'emploi contient sous forme compacte
lla description de toutes les fonctions de base et
ltoutes les informations assurant un fonctionnement sûr, ainsi que
ltous les données techniques.
Une description plus étendue contenant les informations sur des emplois
spéciaux peut être obtenue sous forme pdf dans l'internet sous http://
www.WTW.com.
Observatión
a estas
instrucciones
Este manual de instrucciones incluye la descripción en forma resumida de
ltodas las funciones básicas,
ltodas las observaciones que le garantizan el
lfuncionamiento normal y seguro, asimismo todo las especificaciones y
datos técnicos.
En el internet, bajo http://www.WTW.com encuentra Ud. una descripción
más detallada, en formato pdf, para aplicaciones especiales.
Copyright ©Weilheim 2004, WTW GmbH

pH/Oxi 340i List of contents
3
pH/Oxi 340i - List of contents
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Display and jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Mains power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Switching on the measuring instrument . . . . . . . . . . . . . . . . . . 5
Measuring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Oxygen calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Saving data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Outputting the data memory. . . . . . . . . . . . . . . . . . . . . . . . . . 11
Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Configuring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Resetting to default settings. . . . . . . . . . . . . . . . . . . . . . . . . . 13
Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Safety pH/Oxi 340i
4
Safety
Safety
instructions The individual chapters of this operating manual use the following safety in- struction 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.
Display and jack field
Display
Jack field
Warning
Only connect sensors to the measuring instrument that cannot return any
voltages or currents that are not allowed (> SELV and > current circuit with
current limiting). Almost all sensors - in particular WTW sensors - fulfill these
conditions.
Sal
°
F
1/
cm
/
K
%
TDS
S/
m
cm
cm
M
Lin
Tref25 Tref20
nLF
Time
Baud
Day.Month No.
Ident
Year
8
8.
8
88
8
O
°
Sal
C
%
mg/l
LoBat
TP
1
mbar
S
UpH
RCL
Auto
Store
ARng AR
Cal
mV/pH
AutoCal DIN
AutoCalTEC
Status display indicator
Measured value display
Function and
Temperature display
Sensor symbol
1Oxygen sensor 4Plug-in power supply unit
2pH electrode 5RS232 serial interface
3pH temperature sensor
5
123
4

pH/Oxi 340i Mains power
5
Mains power
You can either operate the measuring instrument with batteries or with the
plug-in power supply. The plug-in power supply provides the measuring in-
strument with low voltage (7.5 V ... 12 V DC). 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 TECHNICAL DATA).
Warning
Only use original plug-in power supplies (see TECHNICAL DATA).
Switching on the measuring instrument
Measuring mode
when switching on
2
1
3
lPlug the jack (1) into the socket (2) of the measuring instrument.
lConnect the original WTW plug-in power supply (3) to an easily accessi-
ble mains socket.
lPress the <>key.
Display test appears briefly on the display.
After this, the measuring instrument automatically switches to the mea-
suring mode. The display shows the relevant measured value.
Connected sensor Measuring mode
No sensor
or pH/ORP electrode pHorORPmeasurement(depending on the last selected setting)
Oxygen sensor Last selected measuring mode
2 sensors of any type Last selected measuring mode

Measuring pH/Oxi 340i
6
Measuring
Overview of the measuring modes:
Special functions:
AutoRead
(drift control) The AutoRead function checks the stability of the measurement signal (ex- cept for the measurement of the ORP voltage). Activate AutoRead with
<AR>. Press <RUN/ENTER> to start the AutoRead measurement. During
the AutoRead measurement, AR flashes on the display until a stable mea-
sured value is reached. This can be terminated at any time taking over the
current measured value with <RUN/ENTER>.
Temperature
measurement
during pH
measurements
You can perform pH measurements with or without a temperature sensor as
well as with the temperature sensor of an oxygen sensor. The measuring in-
strument recognizes which sensors are connected and switches automatical-
ly to the correct mode for the temperature measurement (display TP).
Manual temperature input: Set the temperature value with <▲> <▼>while
pressing the <RUN/ENTER> key.
AutoRange
measuring range
selection
There are several measuring ranges available for oxygen measurements. If
a measuring range is exceeded, AutoRange causes the measuring instru-
ment to change automatically to the next measuring range.
Salt content
correction in
O2measurements
A salt content correction is required in the oxygen concentration measure-
ment of samples with a salt content of more than 1 g/l. To do so, press the
<CAL> key repeatedly until Sal appears on the display. Then, enter the salt
content with <▲> <▼>. Switch on the salt content correction with <▲> while
pressing the <RUN/ENTER> key (display SAL). To switch it off, press <▼>
while pressing the <RUN/ENTER> key.
pH value Redox-
voltage
mV
▲
▼<M>
connect or
disconnect
the D. O. probe
or
Oxygen
concentration
mg/l
Oxygen
saturation
%▲
▼

pH/Oxi 340i pH calibration
7
pH calibration
AutoCal TEC This process is specially adapted to the WTW technical buffer solutions as a
fully automatic single or two-point calibration. The buffer solutions are
automatically recognized by the measuring instrument. Depending on the
instrument setting, the instrument displays the relevant buffer nominal value
or the current electrode voltage in mV.
Valid buffer (values at 25 °C): 2.00 / 4.01 / 7.00 / 10.01
Note
The calibration for pH 10.01 is optimized for the WTW technical buffer solu-
tion TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead to an
erroneous calibration. The correct buffer solutions are given in the WTW
catalog or in the Internet.
AutoCal DIN as AutoCal TEC, but matched to buffer solutions according to DIN 19266.
Valid buffer (values at 25 °C): 1.679 / 4.006 / 6.865 / 9.180
ConCal is the 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.
Calibration
evaluation After calibrating, the measuring instrument automatically evaluates the cali- bration. The asymmetry and slope are evaluated separately. The worst eval-
uation appears on the display.
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
Invalid calibration
< -30 or > 30 < -62 or > -50

pH calibration pH/Oxi 340i
8
Note
If a printer isconnected to theinterface,a calibrationprotocol is automatically
printed after a valid calibration.
AutoCal TEC / AutoCal DIN procedure:
The following example shows the AutoCal TEC calibration. In the
AutoCal DIN calibration, Cd... instead of Ct... appears on the display. Other-
wise, both procedures are identical.
lConnect 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.
lPress the <CAL> key repeatedly until the display Ct1 and the function
display AutoCal TEC appears. The sensor symbol displays the evalua-
tion of the last calibration (or no sensor symbol in the delivery state or af-
ter the measurement parameter has been reset).
lImmerse the pH electrode into the first buffer solution.
lWhen measuring without a temperature sensor:
Enter the temperature of the first buffer solution with <▲> <▼>while
pressing the <RUN/ENTER> key.
lPress <RUN/ENTER>. The AutoRead measurement begins. The elec-
trode voltage (mV) or the buffer nominal value appears on the display. If
the measured value is stable, Ct2 appears.
Note
At this point, the AutoCal TEC calibration can be terminated
with <M>. This corresponds to a single-point calibration.
To do this, the instrument uses the Nernst slope (-59.2 mV/pH
at 25 °C) and determines the asymmetry of the electrode.
lImmerse the two-point calibration pH electrode in the secondbuffer so-
lution to continue.
lWhen measuring without a temperature sensor:
Enter the temperature of the second buffer solution with <▲> <▼>while
pressing the <RUN/ENTER> key.
lPress <RUN/ENTER>. The AutoRead measurement begins. The elec-
trode voltage (mV) or the buffer nominal value appears on the display.
lWhen the measured value is stable, the instrument displays the value of
the slope and the calibration evaluation.
lPress <RUN/ENTER>. The instrument displays the value of the asym-
metry.
lSwitch to the measuring mode with <M>.
8
4
2
t1
°
C
TP
pH
C
AutoCalTEC
8
4
2
t2
°
C
TP
pH
C
AutoCalTEC
94
pH
5
mV/pH
2
pH
mV

pH/Oxi 340i pH calibration
9
ConCal procedure:
lConnect 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.
lPress the <CAL> key repeatedly until the display ASY and the function
display Cal appears. The sensor symbol displays the evaluation of the
last calibration (or no sensorsymbol in thedelivery state or afterthe mea-
surement parameter has been reset).
lImmerse the pH electrode in the first buffer solution
(pH 7.0 ± 0.5 in two-point calibration).
lWhen measuring without a temperature sensor:
Enter the temperature of the first buffer solution with <▲> <▼>while
pressing the <RUN/ENTER> key.
lPress the <RUN/ENTER> key.
The measured pH value appears on the display.
lSet the measured value to the nominalpH value of the buffer solution (at
the current temperature) with <▲> <▼>.
lIfthe measuredvalueis stable,press the<RUN/ENTER> key.The value
of the asymmetry appears.
lPress the <RUN/ENTER> key. SLO appears.
Note
At this point, the ConCal calibration can be terminated with
<M>. This corresponds to a single-point calibration.
To do this, the instrument uses the Nernst slope (-59.2 mV/pH
at 25 °C) and determines the asymmetry of the electrode.
lImmerse the two-point calibration pH electrode in the secondbuffer so-
lution to continue.
lWhen measuring without a temperature sensor:
Enter the temperature of the second buffer solution with <▲> <▼>while
pressing the <RUN/ENTER> key.
lPress <RUN/ENTER>.
lSet the measured value to the nominalpH value of the buffer solution (at
the current temperature) with <▲> <▼>.
lWhen the measured value is stable, press the <RUN/ENTER> key. The
instrument displays the value of the slope and the calibration evaluation.
lPress <RUN/ENTER>. The instrument displays the value of the asym-
metry.
lSwitch to the measuring mode with <M>.
8
4
2
SY
A
pH
Cal
°
C
TP
8
4
2
02
7
pH
Cal
°
C
TP
8
4
2
LO
s
pH
Cal
°
C
TP
8
4
2
58
4
pH
Cal
°
C
TP
92
pH
5
mV/pH
3
pH
mV

Oxygen calibration pH/Oxi 340i
10
Oxygen calibration
Calibration
procedures The calibration is performed in water vapor-saturated air. Use the OxiCal®-SL air calibration vessel (accessories) for the calibration.
Sensor evaluation After the calibration, the measuring instrument evaluates the current status
of the sensor against the relative slope. The evaluation appears on the dis-
play. Therelative slope has no effect onthe measuring accuracy. Low values
indicate that the electrolyte will soon be depleted and the probe will have to
be regenerated.
Oxygen calibration procedure:
Display Relative slope
S = 0.8 ... 1.25
S = 0.7 ... 0.8
S = 0.6 ... 0.7
E3
Invalid calibration
S < 0.6 or S > 1.25
lKeep the OxiCal®-SL air calibration vessel ready.
lConnect the D. O. probe to the measuring instrument.
If necessary, press the <M> key repeatedly until the status display O2
(oxygen measurement) appears.
lPut the D. O. probe into the air calibration vessel.
lPress the <CAL> key repeatedly until the oxygen calibration mode ap-
pears (display O2CAL).
lPress <RUN/ENTER>. The AutoRead measurement begins.
lWhen the measured value is stable, the instrument displays the value of
the relative slope and the sensor evaluation.
lSwitch to the measuring mode with <M>.
6
7
1
AL
C
O
°
C
TP
Cal
6
7
1
88
0
O
°
C
TP
Cal
AR
S

pH/Oxi 340i Saving data
11
Saving data
Saving data
manually Press the <STO> key in the measuring mode (display No. with the number of thenextfree memory location).Then, press<RUN/ENTER> and enterthe ID
number with <▲> <▼>. Terminate the save with <RUN/ENTER>. The instru-
ment changes to the measuring mode.
Saving data
automatically
Int 1
The pH/Oxi 340i portable measuring instrument has an internal data memo-
ry. It can store up to 500 datasets. The save interval (Int 1) determines the
chronological interval between automatic save processes.
To set up the save interval, press <STO> while pressing the <RUN/ENTER>
key (display Int 1) and set the interval with<▲> <▼>key . Then, press <RUN/
ENTER> and enter the ID number with <▲> <▼>. Change to the last active
measuring mode with <RUN/ENTER>. The automatic save is switched on
(display Auto Store).
Outputting the data memory
You can output the data memory with the <RCL> key. By repeatedly press-
ing the <RCL> key, you reach the following functions:
Start the output with <RUN/ENTER>.
Transmitting data
Transmitting data
manually Press the <RUN/ENTER> key in the measuring mode. This manually triggers a data transmission of the current measured value to
the serial interface at any time - independently of the selected intervals.
Transmitting data
automatically
Int 2
The interval to the data transmission (Int 2) determines the chronological in-
terval between automatic data transmissions. After the selected interval ex-
pires, the current data record is transmitted to the interface. To set up the
transmission interval, press <RCL> while holding down the <RUN/ENTER>
key (display Int 2). Then set the interval with <▲> <▼>.
StO dISP Output stored data on the display
StO SEr Output stored data on the serial interface
CAL dISP Output calibration data on the display
CAL SEr Output calibration data on the serial interface

Configuring pH/Oxi 340i
12
Configuring
Note
You can leave theconfiguration menu at anytime with <M>. The parameters
already changed are stored.
Configuring procedure (factory settings appear in bold typeface):
lSwitch off the measuring instrument.
lWhile pressing the <M> key, press <>.
lSelect the required Baud rate with <▲> <▼>.
Selection: 1200, 2400, 4800, 9600 Baud.
lThen press the <RUN/ENTER> key.
lSelect the required display during the pH calibration with <▲> <▼>.
Selection:Buffer nominal value (/pH) or current electrode voltage (mV).
lThen press the <RUN/ENTER> key.
lThe air pressure is only displayed if an oxygen sensor is connected. Oth-
erwise, "---" appears.
lContinue with the <RUN/ENTER> key.
lSelect the required calibration interval for pH/ORP measurements with
<▲> <▼>.
Selection: 1... 7... 999 d.
lThen press the <RUN/ENTER> key.
lSelect the required calibration interval for oxygen measurements with
<▲> <▼>.
Selection: 1... 14... 999 d.
lThen press the <RUN/ENTER> key.
lSelect the date and time step-by-step with <▲> <▼>. In between, press
the <RUN/ENTER> key each time.
lWhen the last <RUN/ENTER> key has been pressed, the instrument
changes to the last active measuring mode.
Baud
0
40
8
p
ds
i
AL
C
/pH
pH
mbar
9
4
9
p
Time
7
d
T3
n
1
pH
Time
4
d
T4
n
1
1
O
Day.Month
4
00
9

pH/Oxi 340i Resetting to default settings
13
Resetting to default settings
You can reset the measurement parameters and the configuration to the de-
livery status separately from one another (initialization).
Measurement
parameters The following measurement parameters (pH/O2InI)can be reset to the deliv-
ery status:
Configuration
parameters The following configuration parameters (InI) can be reset to the delivery sta- tus:
Procedure of the reset:
pH/ORP (pH InI)
Measuring mode pH
Asymmetry 0 mV
Slope -59.16 mV
Oxygen (O2InI)
Measuring mode D. O. concentration
Relative slope 1.00
Salinity (value) 0.0
Salinity (function) off
Baud rate 4800
Display during pH calibration Buffer nominal value
Interval 1
(automatically saved) OFF
Interval 2
(for data transmission) OFF
lTo switch it off, press <CAL> while pressing the <RUN/ENTER> key.
lTo reset the measurement parameters with <▲> <▼>, select YES and
confirm with <RUN/ENTER>, or
lcontinue with the next parameters without a reset with the <RUN/EN-
TER> key (O2InI > InI).
lAfter the configuration parameters, InI changes the instrument to the last
active measurement mode.
o
n
ni
i
pH

Technical data pH/Oxi 340i
14
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
cETLus, CE
Storage - 25 °C ... + 65 °C
Operation -10 °C ... + 55 °C
Climatic class 2
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

pH/Oxi 340i Technical data
15
Oxi measuring
ranges
Precision of
Oxi (± 1 digit)
Correction
functions of Oxi
Serial interface Automatic switchover when a PC or a printer is connected via the cable, AK
340/B or AK 325/S.
mg/l %
Measuring range I
Resolution 0 ... 19.99 0.01 0 ... 199.9 0.1
Measuring range II
Resolution 0 ... 90.0l 0.1 0 ... 600 1
Concentration ± 0.5 % of measured value
at ambient temperature of 5 °C ... 30 °C
Saturation ± 0.5 % of measured value
when measuring in the range of
± 10 K around the calibration temperature
Temperature
compensation < 2 % at 0 ... 40 °C
T [°C] ± 0.1
Salinity correction 0 ... 70.0 SAL
Air pressure correction Automatic through installation of pressure
sensor in the range 500 ... 1100 mbar
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

Technical data pH/Oxi 340i
16
Power supply
Guidelines
and norms used
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 unit
(Euro, US , UK, Australian plug)
FRIWO FW7555M/09, 15.1432
Friwo Part. No. 1822089
Input: 100 ... 240 V ~ / 50 ... 60 Hz / 400 mA
Output: 9 V = / 1,5 A
EMC EG guideline 89/336/EWG
EN 61326 A1:1998
EN 61000-3-2 A14:2000
EN 61000-3-3:1995
FCC Class A
Instrument safety EG guideline 73/23/EWG
EN 61010-1 A2:1995
Climatic class VDI/VDE 3540
Type of protection EN 60529:1991
FCC Class A Equipment Statement
Note: This equipment has been tested and found to comply with the
limits for a Class A digital device, pursuant to Part15 of the FCC Rules.
These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.

pH/Oxi 340i Inhaltsverzeichnis
17
pH/Oxi 340i - Inhaltsverzeichnis
Sicherheit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Display und Buchsenfeld . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Netzbetrieb. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Meßgerät einschalten. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Messen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Kalibrieren pH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Kalibrieren Sauerstoff. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Speichern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Datenspeicher ausgeben . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Daten übertragen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Konfigurieren . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Rücksetzen (Reset) auf Grundeinstellungen . . . . . . . . . . . . . 27
Technische Daten . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Sicherheit pH/Oxi 340i
18
Sicherheit
Sicherheits-
hinweise In den einzelnen Kapiteln dieser Bedienungsanleitung weisen die folgenden Sicherheitshinweise auf verschiedene Stufen von Gefahren hin:
Achtung
kennzeichnet Hinweise, die genau beachtet werden müssen, um mögliche
leichteVerletzungen oder Schädenam Gerät oderder Umwelt zu vermeiden.
Display und Buchsenfeld
Display
Buchsenfeld
Achtung
Schließen Sie an das Meßgerät nur Sensoren an, die keine unzulässigen
Spannungen oder Ströme (> SELV und > Stromkreis mit Strombegrenzung)
einspeisen können.Nahezu alle Sensoren - insbesondere WTW-Sensoren -
erfüllen diese Bedingungen.
Sal
°
F
1/
cm
/
K
%
TDS
S/
m
cm
cm
M
Lin
Tref25 Tref20
nLF
Time
Baud
Day.Month No.
Ident
Year
8
8.
8
88
8
O
°
Sal
C
%
mg/l
LoBat
TP
1
mbar
S
UpH
RCL
Auto
Store
ARng AR
Cal
mV/pH
AutoCal DIN
AutoCalTEC
Statusanzeige
Meßwertanzeige
Funktions- und
Temperaturanzeige
Sensorsymbol
1Sauerstoffsensor 4Steckernetzgerät
2pH-Meßkette 5Serielle Schnittstelle RS232
3Temperaturmeßfühler pH
5
123
4

pH/Oxi 340i Netzbetrieb
19
Netzbetrieb
Sie könnendasMeßgerätwahlweise mitBatterienoder mitdemSteckernetz-
gerät betreiben. Das Steckernetzgerät versorgt das Meßgerät mit Kleinspan-
nung (7,5 V ... 12 V DC). Die Batterien werden dabei geschont.
Achtung
Die Netzspannung am Einsatzort mußinnerhalb des Eingangs-Spannungs-
bereichs des Original-Steckernetzgeräts liegen (siehe TECHNISCHE DATEN).
Achtung
Verwenden Sie nur Original-Steckernetzgeräte (siehe TECHNISCHE DATEN).
Meßgerät einschalten
Meßmodus beim
Einschalten
2
1
3
lStecker (1) in die Buchse (2) des Meßgeräts stecken.
lOriginal WTW-Steckernetzgerät (3) an eine leicht zugängliche Steckdo-
se anschließen
lTaste <>drücken.
Im Display erscheint kurz der Displaytest.
Das Meßgerät schaltet danach automatisch in den Meßmodus. Das Dis-
play zeigt den zugehörigen Meßwert an.
Angeschlossener Sensor Meßmodus
Kein Sensor
oder pH-/Redox-Meßkette pH- oder Redoxmessung (je nach zu- letzt gewählter Einstellung)
Sauerstoffsensor zuletzt eingestellter Meßmodus
2 Sensoren zuletzt eingestellter Meßmodus

Messen pH/Oxi 340i
20
Messen
Überblick über die Meßmodi:
Spezialfunktionen:
AutoRead
(Driftkontrolle) Die Funktion AutoRead prüft die Stabilität des Meßsignals (außer bei der Messung bei Redoxspannung). AutoRead mit <AR> aktivieren. Zum Starten
der AutoRead-Messung <RUN/ENTER> drücken. Während der AutoRead-
Messung blinkt die Anzeige AR, bis ein stabiler Meßwert vorliegt. Ein Ab-
bruch mit Übernahme des aktuellen Meßwerts ist jederzeit mit
<RUN/ENTER> möglich.
Temperaturmes-
sung bei pH-Mes-
sungen
Sie können pH-Messungen mit und ohne Temperaturmeßfühler sowie mit
dem Temperaturmeßfühler eines Sauerstoffsensors durchführen. Das Meß-
gerät erkennt, welche Sensoren angeschlossen sind und schaltet automa-
tisch in den richtigen Modus der Temperaturmessung (Anzeige TP).
Manuelle Temperatureingabe: Bei gedrückter Taste <RUN/ENTER> Tempe-
raturwert mit <▲> <▼>einstellen.
Meßbereichswahl
AutoRange Für Sauerstoffmessungen stehen mehrere Meßbereiche zur Verfügung. AutoRangebewirkt,daßdasMeßgerätbeiÜberschreiteneinesMeßbereichs
automatisch in den nächsten Meßbereich wechselt.
Salinitäts-
korrektur bei
O2-Messungen
Bei der Sauerstoff-Konzentrationsmessung von Meßlösungen mit einem
Salzgehalt von mehr als 1 g/l ist eine Salinitätskorrektur erforderlich. Dazu
die Taste <CAL> so oft drücken, bis im Display Sal erscheint. Anschließend
mit <▲> <▼>Salinität eingeben. Anschließend mit <M> in den Meßmodus
Sauerstoffkonzentration wechseln.
Salinitätskorrektur bei gedrückter Taste <RUN/ENTER> mit <▲> einschal-
ten (Anzeige SAL). Zum Ausschalten <▼> bei gedrückter Taste <RUN/
ENTER> drücken.
pH-Wert Redox-
spannung
mV
▲
▼<M>
Sauerstoffsensor
verbinden
bzw. abstecken
oder
Sauerstoff-
konzentration
mg/l
Sauerstoff-
sättigung
%▲
▼