Xylem MULTI-3400i User Manual
pH/Cond 3400i
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Operating manual
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ba75687e01 01/2007
pH/Conductivity measuring instrument
Accuracy when
going to press
Warranty We guarantee the instrument described for 3 years from the date of
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.
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.
To ascertain the warranty liability, return the instrument and proof of
purchase together with the date of purchase freight paid or prepaid.
Copyright
© Weilheim 2007, WTW GmbH
Reproduction in whole - or even in part - is prohibited without the
express written permission of WTW GmbH, Weilheim.
Printed in Germany.
pH/Cond 3400i Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 SETs of equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.5 Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.6 Operating structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
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 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . 16
4.2.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 18
4.2.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 20
4.3 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.4 Conductivity/Salinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 33
4.4.2 Measuring the conductivity . . . . . . . . . . . . . . . . 35
4.4.3 Measuring the salinity . . . . . . . . . . . . . . . . . . . . 35
4.4.4 AutoRead AR (drift control) . . . . . . . . . . . . . . . . 36
4.4.5 Determining the cell constant (Calibration in the
control standard) . . . . . . . . . . . . . . . . . . . . . . . . 37
4.4.6 Setting the temperature compensation . . . . . . . 40
4.5 Calibration intervals (Int 3, Int 5) . . . . . . . . . . . . . . . . . . 44
4.6 Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.6.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 45
4.6.2 Switching on AutoStore (Int 1) . . . . . . . . . . . . . 47
4.6.3 Outputting the data storage . . . . . . . . . . . . . . . . 49
4.6.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 54
4.7 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.7.1 Data transmission interval (Int 2) . . . . . . . . . . . 55
4.7.2 PC/external printer (RS232 interface) . . . . . . . . 56
4.7.3 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.8 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
3
Contents pH/Cond 3400i
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 65
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
6.1 pH system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
6.2 Conductivity system messages . . . . . . . . . . . . . . . . . . . 69
6.3 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
4
pH/Cond 3400i Overview
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.
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1 Keypad
2 Sample display
3 Jack field
Note
If you need further information or application notes, you can obtain the
following material from WTW:
z Application reports
z Primers
z Safety datasheets.
You will find information on available literature in the WTW catalog or
via the Internet.
5
Overview pH/Cond 3400i
1.2 SETs of equipment
The measuring instrument is also available as part of individual SETs
of equipment.
You will find additional information on this and other accessories in the
WTW catalog or via the Internet.
6
pH/Cond 3400i Overview
Set (sample configuration):
1 pH/Cond 3400i measuring instrument
2 Beaker, 50 ml
3 Stand
4 Calibration and control standard for conductivity measuring
cells, 50 ml
5 50 ml pH buffer solution, STP 4
6 50 ml pH buffer solution, STP 7
7 Storing solution for pH electrodes
8 Conductivity measuring cell
9 pH combination electrode
10 Plug-in power supply (optional)
7
Overview pH/Cond 3400i
1.3 Keypad
STOM
ARRCLCAL
RUN/ENTER
Key functions
M
STO
CAL
RCL
AR
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 <▼ >
RUN/ENTER
Confirm entries, start AutoRead
<RUN/ENTER>
8
pH/Cond 3400i Overview
1.4 Display
Status display
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AutoCal DIN
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AutoCal TEC
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Sal
mV/pH
%
m
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1/
°
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Auto
ARng
mg/l
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cm
M
cm
°
%
C
Store
AR
Sal
K
/
cm
TP
RCL
Probe symbol
Meas. value display
Function and
temperature display
5
4
123
1 TetraCon 325 conductivity measuring cell
2 pH electrode
3 pH temperature sensor
4 Plug-in power supply (optional)
5 Serial interface RS 232
9
Overview pH/Cond 3400i
1.6 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 sensor, 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.
10
pH/Cond 3400i Safety
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 chapter 7 T
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.
ECHNICAL DATA
11
Safety pH/Cond 3400i
2.2 General safety instructions
This instrument is built and inspected according to the relevant guidelines and norms for electronic measuring instruments (see chapter
7T
ECHNICAL DATA).
It left the factory in a safe and secure technical condition.
Function and operating
safety
Safe operation If safe operation is no longer possible, the instrument must be taken out
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.
of service and secured against inadvertent operation!
Safe operation is no longer possible if the measuring instrument:
z has been damaged in transport
z has been stored under adverse conditions for a lengthy period of
time
Obligations of the pur-
chaser
12
z is visibly damaged
z no longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the instrument.
The purchaser of the measuring instrument must ensure that the following laws and guidelines are observed when using dangerous substances:
z EEC directives for protective labor legislation
z National protective labor legislation
z Safety regulations
z Safety datasheets of the chemical manufacturers.
pH/Cond 3400i Commissioning
3 Commissioning
3.1 Scope of delivery
z 3400i handheld meter
z Plug-in power supply (optional)
z Operating manual and short operating manual
z 4 batteries, 1.5 V Mignon type AA (in the instrument)
Setting the date and
time
For details of scope of delivery of SETs, see chapter 1.2 SET
EQUIPMENT and WTW catalog.
3.2 Initial commissioning
Perform the following activities:
z Set the date and time
z Connect the plug-in power supply (optional)
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.
S OF
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
Commissioning pH/Cond 3400i
13 Confirm with <RUN/ENTER>.
The instrument switches to a measuring mode.
14 Switch the instrument off using <ON/OFF>.
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 chapter 7 T
TA).
ECHNICAL DA-
Warning
Use original plug-in power supplies only (see
chapter 7 T
ECHNICAL DATA).
2
1
3
14
1 Plug the jack (1) into the socket (2) of the measuring instru-
ment.
2 Connect the original WTW plug-in power supply (3) to an easily
accessible mains socket.
pH/Cond 3400i Operation
4 Operation
4.1 Switching on the measuring instrument
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.
Measuring mode when
switching on
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
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
z if the power is supplied by the plug-in power supply,
z if the AutoStore function is active,
z if the communication cable and a PC with a running communication
program are connected,
z if the printer cable is connected (for external printers).
15
Operation pH/Cond 3400i
4.2 pH value / ORP voltage
4.2.1 General information
Preparatory activities Perform the following preparatory activities when you want to measure:
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 sensor.
3 Calibrate or check the measuring instrument with the elec-
trode.
4Using <▲ > <▼>, toggle between the pH or mV measuring
modes.
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 sensor.
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.
16
pH/Cond 3400i Operation
Temperature measure-
ment in pH measure-
ments
You can perform pH measurements with or without a temperature sensor as well as with the temperature sensor 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.
Temperature sensor Display Mode
pH Cond
yes - TP Automatic with
pH temperature sensor
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*
* 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 sensor.
If a temperature sensor is connected, it is indicated on the display by
TP.
Note
When calibrating without a temperature sensor (no TP display indicator
displayed), enter the current temperature of the respective buffer solution manually using the <▲> <▼> keys while keeping the <RUN/EN-
TER> key depressed.
17
Operation pH/Cond 3400i
4.2.2 Measuring the pH value
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.
TDS
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4 When measuring without a connected temperature sensor:
Options:
z Determine the current temperature using a thermometer
z TP display indicator not displayed, socket for the second
pH
9
2
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AutoCal DIN
Tref20
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Cal
AutoCal TEC
and, while keeping the <RUN/ENTER> key depressed, enter this temperature value with <▲> <▼>.
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.
9
4
SalOU
mV/pH
%
m
mbar
1/
°
F
8
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
TP
RCL
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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:
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).
pH/Cond 3400i Operation
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.
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
19
Operation pH/Cond 3400i
4.2.3 Measuring the ORP voltage
In conjunction with an ORP electrode, e.g. SenTix ORP, the measuring
instrument can measure the ORP voltage (mV) of a 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.
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pH
U
2
AutoCal DIN
AutoCal TEC
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4
SalO
mV
%
m
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1/
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ARng
/pH
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
TDS
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Note
ORP electrodes are not calibrated. However, you can check ORP electrodes using a test solution.
20
pH/Cond 3400i Operation
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? z After connecting another electrode
z 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 WTW technical buffer solutions as a fully au-
tomatic two-point calibration. The buffer solutions are automatically
recognized by the measuring instrument. Depending on the instrument
setting (see section 4.8 C
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 instrument
uses the Nernst slope (-59,2 mV/pH at 25 °C) and determines the
asymmetry of the electrode.
ONFIGURATION), the instrument displays the
AutoCal DIN is specially adapted to the permanently programmed buffer solutions in
ConCal This function is a conventional two-point calibration using two buffer
AutoRead When calibrating with AutoCal TEC and AutoCal DIN, the AutoRead
Displaying the calibra-
tion data
Printing the calibration
record
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).
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.
function is automatically activated.
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
You can view the data of the last calibration on the display. The proceeding is described on page 51.
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 53).
21
Operation pH/Cond 3400i
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
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 10.00
C1 184.1 mV 25.0°C
C2 3.0 mV 25.0°C
S1 -59.4 mV/pH
ASY1 - 4 mV
Probe: +++
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.
Display Asymmetry
[mV]
Slope
[mV/pH]
-15 ... + 15 -60.5 ... -58
-20 ... +20 -58 ... -57
-25 ... +25 -61 ... -60.5
or
-57 ... -56
-30 ... +30 -62 ... -61
or
-56 ... -50
22
Clean the electrode according to the
electrode operating manual
E3
Eliminate the error according to chapter 6 W
HAT TO DO IF...
< -30 or
> 30
... -62 or
... -50
pH/Cond 3400i Operation
Preparatory activities
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 sensor (the TP display indicator is missing from
the display).
4.3.1 AutoCal TEC
For this procedure, use any two WTW 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 WTW technical buffer
solution 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.
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
sensor or the temperature sensor of a conductivity measuring cell.
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).
23
Operation pH/Cond 3400i
TDS
S
C
1
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Day.Month No.
Year
Ident
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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:
7
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
pH
OU
Sal
/pH
mV
%
mg/l
m
S/
cm
cm
M
t
2
8
AutoCal DIN
Tref20
Cal
Lin
AutoCal TEC
3
22
0
AutoCal DIN
Tref20
Cal
Lin
AutoCal TEC
mbar
1
Sal
cm
1/
TP
°
K
%
/
°
C
F
8
4
44
Store
Auto
ARng
AR
RCL
TDSTDS
mV
SS
cm
cm
TP
°
°
C
F
88
Store
Auto
ARng
AR
RCL
7
11
Time
Day.Month No.
Year
Tref25
LoBat
nLF
Baud
Ident
Lin
0
0
Tref20
Cal
pHpH
OO UpHUpH SalSal
03
AutoCal DIN
AutoCal TEC
mbarmbar
mV/pHmV/pH
%%
mm
1/1/
°
Auto
ARng
F
mg/lmg/l
S/S/
°
cmcm
MM
cm
%%
C
Store
ARAR
AR
SalSal
KK
//
cm
TP
RCL
24
5 When the measured value is stable, Ct2 appears.
Lin
t
8
Tref20
Cal
pH
OU
2
2
4
AutoCal DIN
AutoCal TEC
Sal
mV
%
m
mbar
1/
°
F
8
Auto
ARng
/pH
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
TDS
S
C
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
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-
pH/Cond 3400i Operation
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 depressed.
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:
TDS
mV
S
1
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
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.
TDS
22
0
Tref20
Lin
44
AutoCal DIN
Cal
AutoCal TEC
pH
OU
S
9
1
Time
Day.Month
Year
LoBat
5
Baud
No.
Ident
Tref25
nLF
Tref20
Lin
S
Cal
4
L
AutoCal DIN
AutoCal TEC
cm
TP
°
°
C
F
88
Store
Auto
ARng
AR
RCL
Sal
mV/pH
%
mg/l
m
S/
cm
cm
M
mbar
Sal
cm
1/
TP
°
K
%
/
°
C
F
O
Store
Auto
ARng
AR
RCL
TDS
S
4
1
Time
Day.Month No.
Year
Tref25
LoBat
nLF
Baud
Ident
Lin
08
0
Tref20
Cal
pHpH
OO UpHUpH SalSal
14
AutoCal DIN
AutoCal TEC
mbarmbar
ARng
mV/pHmV/pH
%%
mm
°
Auto
1/1/
F
mg/lmg/l
S/S/
MM
cm
°
%%
C
Store
ARAR
AR
cmcm
cmcm
SalSal
TP
KK
//
RCL
11 Press the <RUN/ENTER> key. The value of the asymmetry
(mV) appears on the display.
25
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