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