wtw Cond 340i User manual

Multi 340i
ba52319edfs04 06/2004
ba52319edfs
Operating manual
Bedienungsanleitung
Mode d’emploi
Instrucciones de operación
Universal Pocket Meter Page 3
Universal-Taschenmeßgerät Seite 17
Instrument de poche universel Page 31
Instrumento manual de medición universal Página 45
AR
RCL
STO
CAL
M
O
6
7
1
92
7
O
°
C
mg/l
ARng
TP

Multi 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

Multi 340i List of contents
3
Multi 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Conductivity: Determining the cell constants . . . . . . . . . . . . . 10
Saving data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Outputting the data memory. . . . . . . . . . . . . . . . . . . . . . . . . . 11
Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Configuring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Resetting to default settings. . . . . . . . . . . . . . . . . . . . . . . . . . 13
Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Safety Multi 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.
ARng
Tref20
AutoCal DIN
Lin
TDS
cm
M
°
F
/
K
%
Time
Baud
Day.Month No.
Ident
Year
8
8.
8
88
8
°
C
%
mg/l
TP
1
mV/pH
UpH SalO
S
Tref25
nLF
AutoCalTEC
RCL
Auto
Store
LoBat
Cal
AR
1/
cm
Sal
mbar
S/
m
cm
Status display indicator
Measured value display
Function and
Temperature display
Sensor symbol
1Oxygen sensor or conductivity
measuring cell 4Plug-in power supply unit
2pH electrode 5RS232 serial interface
3pH temperature sensor
5
123
4

Multi 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
or conductivity measuring cell Last selected measuring mode
2 sensors of any type Last selected measuring mode

Measuring Multi 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 mea-
surement 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 or a conductivity
measuring cell. The measuring instrument recognizes which sensors are
connected and switches automatically to the correct mode for the tempera-
ture measurement (display TP).
Manual temperature input: Set the temperature value with <▲> <▼>while
pressing the <RUN/ENTER> key.
AutoRange mea-
suring range
selection
There are several measuring ranges available for both oxygen and conduc-
tivity measurements. If a measuring range is exceeded, AutoRange causes
the measuring instrument 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.
Reference
temperature of the
conductivity, Tref
The reference temperature can be switched between 20 °C and 25 °C. It ap-
pears on the display as Tref20 or Tref25. To switchover the reference tem-
perature, see CONFIGURING.
Connect or
disconnect
the D. O. probe or or
pH value Redox-
voltage
mV
Connect or disconnect
the conductivity
measuring cell
<M> <M>
Oxygen
concentration
mg/l
Oxygen
saturation
%
Conductivity
µS/cm
Exchange probe
Salinity
Sal
▲
▼▲
▼
▲
▼

Multi 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 au-
tomatically recognized by the measuring instrument. Depending on the in-
strument 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 er-
roneous calibration. The correct buffer solutions are given in the WTW
catalog or in the Internet.
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.
Note
Ifaprinterisconnectedtotheinterface,acalibrationprotocolis automatically
printed after a valid calibration.
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 Multi 340i
8
AutoCal TEC procedure (single and two-point calibration):
lConnect the pH electrode to the measuring instrument.
If necessary, press the <M> key untilthe status display pH (pH measure-
ment) or U(measurement of the ORP voltage) appears.
lPress the <CAL> key. The Ct1 display and the function display AutoCal
TEC appears. The sensor symbol displays the evaluation of the last cal-
ibration (or no sensor symbol in the delivery state or after the measure-
ment 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

Multi 340i Oxygen calibration
9
Oxygen calibration
Calibration proce-
dures 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 on themeasuring 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

Conductivity: Determining the cell constants Multi 340i
10
Conductivity: Determining the cell constants
Procedure The cell constants are determined in the control standard 0.01 mol/l KCl.
Calibration
evaluation After the calibration, the measuring instrument automatically evaluates the current status of the calibration. The evaluation appears on the display.
Procedure for determining the cell constants:
Display Cell constant [cm-1]
0.450 ... 0.500 cm-1
E3
Invalid calibration
Outside the range
0.450 ... 0.500 cm-1
lConnect a conductivity measuring cell to the measuring instrument.
If necessary, press the <M> key repeatedly until the status display
(conductivity measurement) appears.
lPress the <CAL> key. Depending on the calibration status, 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.
Note
At this point, the procedure can be terminated with <M>.
lImmerse the conductivity measuring cell in the control standard solution,
0.01 mol/l KCI.
lPress <RUN/ENTER>. The AutoRead measurement begins.
lWhen the measured value is stable, the instrument displays the deter-
mined cell constants and the calibration evaluation. The measuring in-
strument automatically stores the cell constants.
lSwitch to the measuring mode with <M>.
2
07
4
Cal
cm
1/
Tref25
AL
C
3
07
4
Cal
cm
1/
Tref25
AL
C