pH/ION 3400i
Operating manual
6
M
C
AL
S
T
O
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AR
pH
9
2
29
4
8
°C
TP
O
pH/Ion meter
ba75685e01 01/2007
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/ION 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 . . . . . . . . . . . . . . . . . . 17
4.2.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 19
4.3 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.4 Ion concentration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 32
4.4.2 Measuring the ion concentration . . . . . . . . . . . . 33
4.4.3 Calibration for ion selective measurements . . . 34
4.5 Calibration interval (Int 3) . . . . . . . . . . . . . . . . . . . . . . . 41
4.6 Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.6.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 42
4.6.2 Switching on AutoStore (Int 1) . . . . . . . . . . . . . 44
4.6.3 Outputting the data storage . . . . . . . . . . . . . . . . 46
4.6.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 52
4.7 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.7.1 Data transmission interval (Int 2) . . . . . . . . . . . 53
4.7.2 PC/external printer (RS232 interface) . . . . . . . . 54
4.7.3 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.8 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
5 Maintenance, cleaning, disposal. . . . . . . . . . . . . . . . . 63
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
3
Contents pH/ION 3400i
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.1 pH system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.2 ISE system messages . . . . . . . . . . . . . . . . . . . . . . . . . . 67
6.3 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
4
pH/ION 3400i Overview
1Overview
1.1 General features
This compact precision handheld meter enables you to carry out pH /
ORP measurements and concentration measurements using ion selective electrodes 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 and the special AutoRead
function support you in your work with the handheld meter.
6
M
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pH
9
2
29
4
8
°C
TP
O
3
2
1
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/ION 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/ION 3400i Overview
Set (sample configuration):
1 pH/ION 3400i measuring instrument
2 Stand
3 Measuring beaker,50 ml
4 50 ml pH buffer solution, STP 4
5 50 ml pH buffer solution, STP 7
6 Storing solution for pH electrodes
7 pH combination electrode
8 Plug-in power supply (optional)
7
Overview pH/ION 3400i
1.3 Keypad
STOM
ARRCLCAL
RUN/ENTER
Key functions
M
STO
CAL
RCL
AR
Select the measured variable <M>:
– pH value / ORP voltage
– Ion concentration
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/ION 3400i Overview
1.4 Display
Status display
ISE
UpH
S
8
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
1.5 Jack field
8
8.
Auto
ConCal
8
Store
88
8
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/l
%
Tem pEr ro r
AR
TP
RCL
Probe symbol
Meas. value display
Function and
temperature display
5
4
f
e
R
123
1 pH electrode or ISE (combination) electrode
2 Reference electrode
3 Plug-in power supply (optional)
4 pH temperature sensor
5 Serial interface RS 232 / analog output (recorder)
9
Overview pH/ION 3400i
1.6 Operating structure
The following overview diagram shows which keys you have to press
to select between the different measuring modes:
10
pH/ 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 ion concentration 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/ 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/ 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/ 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
f
e
R
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/ 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.
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/ 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.
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.
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.
The temperature measurement is absolutely essential for a reproducible pH measurement. If the measurement is made without a temperature sensor, proceed as follows:
16
1 Measure the current temperature of the test sample using a
thermometer.
2 Enter the temperature on the instrument: While pressing the
<RUN/ENTER> key, enter the temperature value of the test
sample with <▲ > <▼>.
pH/ 3400i Operation
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 If required, enter the temperature of the test sample with <▲>
<▼> while keeping the <RUN/ENTER> key depressed.
4 Press the <▲> <▼> keys until pH appears in the status display.
The pH value appears on the display.
ISE
U
pH
29
8
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
6
1
Time
Day.Month No.
Year
AutoCal DIN
LoBat
AutoCal TEC
Baud
Ident
8
9
2
Auto
ConCal
4
Store
Setting the resolution
AutoRead AR
(drift control)
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <M> key. The measured values are displayed with a
high resolution, e.g. pH = 4.012.
3 Press the <RUN/ENTER> and <M> key once more.
The measured values are displayed with a low resolution, e.g.
pH = 4.01.
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).
17
Operation pH/ 3400i
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>.
18
pH/ 3400i Operation
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.
ISE
S
6
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
Note
ORP electrodes are not calibrated. However, you can check ORP electrodes using a test solution.
9
8
pH
U
2
Auto
ConCal
0
4
Store
5
8
CalError
ARng
mol/L
mV/pH
mV
% ppm
mg/L
°F
%
°C
TempError
AR
TP
RCL
19
Operation pH/ 3400i
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 (-59,16 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 48.
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 51).
20
pH/ 3400i Operation
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
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
21
Operation pH/ 3400i
Preparatory activities
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 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.
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).
22
pH/ 3400i Operation
Lin
8
Tref20
1
8
pH
t
2
Cal
U
pH
2
Auto
ConCal
OU
1
4
AutoCal DIN
AutoCal TEC
3
4
Store
Sal
mV
%
m
mbar
8
Auto
ARng
3
°F
°C
8
CalError
ARng
/pH
mg/l
S/
cm
M
cm
1/
°
%
°
C
F
Store
AR
mol/L
mV/pH
mV
% ppm
mg/L
%
TempError
AR
cm
Sal
K
/
RCL
TP
RCL
TP
S
7
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
ISE
0
8
U
pH
2
Auto
ConCal
0
4
Store
0
8
CalError
ARng
mol/L
mV
mV/pH
% ppm
mg/L
°F
%
°C
TempError
AR
TDS
S
C
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
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:
ISE
S
6
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
TP
RCL
5 When the measured value is stable, Ct2 appears.
ISE
U
pH
2C
8
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
23
S
6
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
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-
8
t
2
Auto
ConCal
4
Store
Operation pH/ 3400i
strument uses the Nernst slope (-59,16 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 de-
pressed.
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:
ISE
U
pH
8
45
0
mV/pH
mV
% ppm
°F
°C
CalError
ARng
°F
°C
CalError
ARng
mol/L
mg/L
TP
%
TempError
RCL
AR
mol/L
mV/pH
% ppm
mg/L
%
TempError
AR
1
TP
RCL
S
80
1 4
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN AutoCal DIN
LoBat
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.
ISE
8
2
Auto
ConCal
U
pH
4
4
Store
S
6
1
Time
Day.Month No.
Year
AutoCal DIN
LoBat
AutoCal TEC
Baud
Ident
8
9
s
Auto
ConCal
L
Store
ISE
S
Baud
Time
Day.Month No.
Year
Ident
LoBat
AutoCal TECAutoCal TEC
0
8
U
pH
2
Auto
ConCal
0
4
Store
8
8
CalError
ARng
mol/L
mV
mV/pH
% ppm
mg/L
°F
%
°C
TempError
AR
TP
RCL
24
11 Press the <RUN/ENTER> key. The value of the asymmetry
(mV) appears on the display.
pH/ 3400i Operation
ISE
U
pH
4
y
CalError
ARng
mol/L
mV/pH
mV
% ppm
mg/L
°F
%
°C
TempError
AR
TP
RCL
S
5
6
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
12 Switch to the measuring mode with <M>.
8
9
a
Auto
ConCal
s
Store
25
Operation pH/ 3400i
4.3.2 AutoCal DIN
For this procedure, use two different standard buffer solutions according to DIN 19266 (type A, C, D or F with pH values at 25 °C of: 1.679 /
4.006 / 6.865 / 9.180).
Note
Skip the steps 2 and 7 if you use a pH electrode with a temperature
sensor.
1 Press the <CAL> key repeatedly until the display Cd1 and the
function display AutoCal DIN appear. The sensor symbol displays the evaluation of the last calibration (or no sensor symbol
in the delivery state or after the measurement parameter has
been reset).
ISE
U
pH
1C
8
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
6
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
8
d
2
Auto
ConCal
4
Store
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:
ISE
U
pH
8
mV/pH
mV
% ppm
°F
°C
CalError
ARng
mol/L
mg/L
%
TempError
RCL
AR
1
TP
S
77
1 4
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN AutoCal DIN
LoBat
8
7
2
Auto
ConCal
4
Store
ISE
S
Baud
Time
Day.Month No.
Year
Ident
LoBat
AutoCal TECAutoCal TEC
0
8
U
pH
2
Auto
ConCal
0
4
Store
6
8
CalError
ARng
mol/L
mV
mV/pH
% ppm
mg/L
°F
%
°C
TempError
AR
TP
RCL
26
pH/ 3400i Operation
5 When the measured value is stable, Cd2 appears.
ISE
U
pH
2C
8
mV/pH
% ppm
°F
°C
CalError
ARng
mol/L
mg/L
%
TempError
RCL
AR
TP
S
6
1
Baud
Time
Day.Month No.
Year
Ident
8
AutoCal DIN
LoBat
AutoCal TEC
Note
At this point, the AutoCal DIN calibration can be terminated with <M>.
This corresponds to a single-point calibration. When doing so, the in-
strument uses the Nernst slope (-59,16 mV/pH at 25 °C) and determines the asymmetry of the electrode.
d
2
Auto
ConCal
4
Store
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:
ISE
U
pH
8
mol/L
mV/pH
mV
% ppm
°F
°C
CalError
ARng
mg/L
%
TempError
RCL
AR
TP
S
23
1 9
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN AutoCal DIN
LoBat
8
7
2
Auto
ConCal
4
Store
S
1
Baud
Time
Day.Month No.
Year
Ident
LoBat
AutoCal TECAutoCal TEC
ISE
1
8
U
pH
2
Auto
8
4
Store
ConCal
0
8
CalError
ARng
mol/L
mV
mV/pH
% ppm
mg/L
°F
%
°C
TempError
AR
TP
RCL
27
Operation pH/ 3400i
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.
ISE
U
pH
45
0
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
-
1
Baud
Time
Day.Month No.
Year
Ident
8
AutoCal DIN
LoBat
AutoCal TEC
11 Press the <RUN/ENTER> key. The value of the asymmetry
(mV) appears on the display.
9
s
Auto
ConCal
L
Store
ISE
U
pH
4
y
CalError
ARng
mol/L
mV/pH
mV
% ppm
mg/L
°F
%
°C
TempError
AR
TP
RCL
S
5
6
1
Baud
Time
Day.Month No.
Year
Ident
8
AutoCal DIN
LoBat
AutoCal TEC
12 Switch to the measuring mode with <M>.
9
a
Auto
ConCal
s
Store
28
pH/ 3400i Operation
4.3.3 ConCal
Two-point calibration For this procedure, use two buffer solutions:
z pH 7.0 ± 0.5
z any other buffer solution
Note
Skip the steps 2 and 8 if you use a pH electrode with a temperature
sensor.
1 Press the <CAL> key repeatedly until the ASY display and the
ConCal function display appears. The sensor symbol displays
the evaluation of the last calibration (or no sensor symbol in the
delivery state or after the measurement parameter has been
reset).
ISE
U
pH
YA
8
mV/pH
% ppm
°F
°C
CalError
ARng
mol/L
mg/L
%
TempError
RCL
AR
TP
S
6
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
8
S
2
Auto
ConCal
4
Store
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 (pH 7.0 ±
0.5 in two-point calibration).
4 Press the <RUN/ENTER> key.
The measured pH value appears on the display.
5 Set the measured value to the nominal pH value of the buffer
solution (at the current temperature) with <▲> <▼>.
6 When the measured value is stable, press the <RUN/ENTER>
key. The value of the asymmetry appears.
7 Press the <RUN/ENTER> key. SLO appears.
Note
At this point, the ConCal calibration can be broken off with <M>. This
corresponds to a single-point calibration. When doing so, the instru-
ment uses the Nernst slope (-59,16 mV/pH at 25 °C) and the fixed
asymmetry of the electrode.
29
Operation pH/ 3400i
ISE
U
pH
OS
8
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
6
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
8 Thoroughly rinse the electrode with deionized water.
9 If required, enter the temperature of the second buffer solution
with <▲> <▼> while keeping the <RUN/ENTER> key de-
pressed.
8
L
2
Auto
ConCal
4
Store
10 Immerse the pH electrode in the second buffer solution.
11 Press the <RUN/ENTER> key.
12 Set the measured value to the nominal pH value of the buffer
solution (at the current temperature) with <▲> <▼>.
13 When the measured value is stable, press the <RUN/ENTER>
key. The value of the slope (mV/pH) appears on the display.
The probe symbol shows the evaluation of the current calibration.
ISE
U
pH
25
0
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
-
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
8
9
s
Auto
ConCal
L
Store
30
14 Press the <RUN/ENTER> key. The value of the asymmetry
(mV) appears on the display.
pH/ 3400i Operation
ISE
U
pH
3
y
CalError
ARng
mol/L
mV/pH
mV
% ppm
mg/L
°F
%
°C
TempError
AR
TP
RCL
S
5
6
1
Baud
Time
Day.Month No.
Year
Ident
8
AutoCal DIN
LoBat
AutoCal TEC
15 Switch to the measuring mode with <M>.
9
a
Auto
ConCal
s
Store
31
Operation pH/ 3400i
4.4 Ion concentration
4.4.1 General information
Preparatory activities Perform the following preparatory activities when you want to measure
the concentration using an ion selective electrode:
1 Connect the ion selective electrode and the reference elec-
trode to the measuring instrument.
2 If necessary, connect a temperature sensor (sockets 2 and 4,
see section 1.5 J
3 If necessary, press the <M> key repeatedly until the status dis-
play ISE appears.
4 Adjust the temperature of the solutions and measure the cur-
rent temperature if the measurement is made without temperature sensor.
ACK FIELD on page 9.
Note
Incorrect calibration of ion selective electrodes leads to incorrect measured values. Calibrate regularly before measuring.
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.
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.
32
pH/ 3400i Operation
The temperature measurement is absolutely essential for a reproducible ISE measurement. If the measurement is made without a temperature sensor, proceed as follows:
1 Measure the current temperature using a thermometer.
2 Bring the test sample and calibration standards to the same
temperature (± 2 °C).
Note
For ISE measurements and ISE calibration, it is not possible to enter
temperature values manually.
4.4.2 Measuring the ion concentration
To perform ion concentration measurements, proceed as follows:
AutoRead AR
(Drift control)
1 Perform the preparatory activities according to section 4.4.1.
2 Immerse the ISE electrode and, if necessary, the temperature
sensor in the test sample.
ISE
UpH
71
8
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
%
Tem pEr ro r
RCL
AR
TP
S
0
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable effect on the reproducibility of the measured value.
For identical measurement conditions, the following criteria apply:
Reproducibility Response time
8
5
2
Auto
ConCal
0
Store
better ± 0.05 mV > 30 seconds
33
Operation pH/ 3400i
1 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
2 Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
This measured value is transmitted to the interface.
3 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
4 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>.
4.4.3 Calibration for ion selective measurements
Why calibrate? Ion sensitive electrodes age and are temperature dependent. This
changes the slope. As a result, an inexact measured value is displayed.
Calibration determines the current value of the slope of the electrode
and stores it in the measuring instrument.
Thus, you should calibrate before each measurement (if possible), and
at regular intervals.
Note
For calibration, use tempered standard solutions with a temperature
that differs by maximum
± 2 °C from the temperature of the test sam-
ple.
When to calibrate? z Before each ISE measurement if possible
z After connecting another ion selective electrode or reference elec-
trode
z When the sensor symbol flashes after a voltage interruption, e.g.
battery change
ConCal This is the conventional two-point or three-point calibration procedure
that uses 2 or 3 freely selectable standard solutions. The concentration
expected for the measurement determines the concentration of the calibration standards.
34
AutoRead The calibration procedure automatically activates the AutoRead func-
tion. To accept the current measured value without waiting for the AutoRead function to finish, just press <RUN/ENTER>.
pH/ 3400i Operation
TP display If you use a temperature sensor, a flashing TP display indicates that the
difference in temperature of the standard solutions is too high (more
than 2 °C).
Displaying the
calibration data
Printing the
calibration protocol
You can view the data of the last calibration on the display. The proceeding is described on page 48.
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 51).
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
02.03.99 / 16:20
Device No.: 1234
CALIBRATION ISE
Cal time: 01.03.99 / 15:10
Std 1 10,00 mg/l
Std 2 20,00 mg/l
Std 3 50,00 mg/l
C1 0,5 mV 25.0°C
C2 8,4 mV 24.9°C
C3 21,2 mV 25.0°C
S1 26.4 mV
S2 32,1 mV
Probe: +++
Calibration evaluation After the calibration, the measuring instrument evaluates the calibra-
tion. The slope (in mV) is evaluated. The probe symbol shows the calibration evaluation.
Display Slope [mV]
50.0 ... 70.0
25.0 ... 35.0
E3
Eliminate the error according to
chapter 6 W
HAT OT DO IF...
35
Operation pH/ 3400i
Preparatory activities Perform the following preparatory activities:
1 Connect the ion selective electrode and the reference elec-
trode to the measuring instrument.
2 Connect a temperature sensor (sockets 2 and 4, see
section 1.5 J
ACK FIELD on page 9.
3 If necessary, press the <M> key repeatedly until the status dis-
play ISE appears.
4 Keep tempered standard solutions ready.
Note
For calibration, use tempered standard solutions with a temperature
that differs by maximum
± 2 °C from the temperature of the test sam-
ple.
Standard solutions Use two or three different standard solutions from the following selec-
tion. In the three-point calibration, the standards must be selected in
either ascending or descending order.
Parameter Values [mg/l]
Std 1 0.01 / 0.02 / 0.05 / 0.1 / 0.2 / 0.5 / 1 / 2 / 5 / 10 / 20 /
50 / 100 / 200 / 500 / 1000
Std 2
Std 3
If Std 2
If Std 2
> Std 1, Std 3 must be > Std 2
< Std 1, Std 3 must be < Std 2
With a two-point calibration, the calculated slope is used for the entire
measuring range of the electrode. With a three-point calibration, the entire measuring range is divided into measuring range I and II. Different
calibration values apply for the two measuring ranges. The measured
value of standard solution 2 separates the two measuring ranges from
each other.
Note
Among other things, the measuring accuracy depends on the selected
standards solutions. Therefore, the standard solutions selected should
cover the expected value range of the following concentration measurement.
36
pH/ 3400i Operation
Two-point calibration
1 Press the <CAL> key. The previously set up concentration of
the first standard solution and ConCal appear on the display.
ISE
UpH
00
1
mol/L
mV/pH
% ppm
°F
°C
CalError
ARng
mg/l
%
TempError
AR
TP
RCL
S
1
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
2 Enter the current concentration of the first standard solution
with <▲> <▼>.
3 Immerse the ISE electrode and, if necessary, the temperature
sensor in the first standard solution.
4 Press the <RUN/ENTER> key.
The electrode voltage appears on the display, the AR display
indicator flashes.
S
0
t
Auto
ConCal
d
Store
ISE
UpH
5
4
CalError
ARng
mol/L
mV
% ppm
mg/L
°F
°C
TempError
AR
/pH
%
TP
RCL
S
0
1
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
5 As soon as a stable value is achieved, AR stops flashing. The
previously set up concentration of the second standard solution
appears on the display.
2
0
2
Auto
ConCal
3
Store
37
Operation pH/ 3400i
ISE
UpH
00
2
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/l
TP
%
TempError
RCL
AR
S
2
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
6 Enter the current concentration of the second standard solution
with <▲> <▼>.
7 Thoroughly rinse the ion selective electrode and, if necessary,
the temperature sensor with deionized water.
8 Immerse the ion selective electrode and, if necessary, the tem-
perature sensor in the second standard solution.
S
0
t
Auto
ConCal
d
Store
9 Press the <RUN/ENTER> key.
The electrode voltage appears on the display, the AR display
indicator flashes.
ISE
UpH
4
4
CalError
ARng
mol/L
mV
% ppm
mg/L
°F
°C
AR
/pH
TP
%
TempError
RCL
S
0
1
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
10 As soon as a stable value is reached, the AR display indicator
stops flashing. The slope (mV) of the electrode after the twopoint calibration appears on the display.
The probe symbol shows the evaluation of the two-point calibration for the measuring range I.
2
8
2
Auto
ConCal
3
Store
38
pH/ 3400i Operation
ISE
U
pH
4
4
CalError
ARng
mol/L
mV
% ppm
mg/L
°F
%
°C
TempError
AR
/pH
TP
RCL
S
2
1
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
11 To return to the measuring mode: Press the <M> key or go on
to the three-point calibration by pressing the <RUN/ENTER>
key.
2
6
2
Auto
ConCal
3
Store
Three-point
calibration
12 The previously set up concentration of the third standard solu-
tion appears on the display.
ISE
UpH
00
3
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/l
TP
%
TempError
RCL
AR
S
5
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
13 Enter the current concentration of the third standard solution
with <▲> <▼>.
14 Thoroughly rinse the ion selective electrode and, if necessary,
the temperature sensor with deionized water.
15 Immerse the ion selective electrode and, if necessary, the tem-
perature sensor in the third standard solution.
16 Press the <RUN/ENTER> key.
The electrode voltage appears on the display, the AR display
indicator flashes.
S
0
t
Auto
ConCal
d
Store
39
Operation pH/ 3400i
ISE
U
pH
2
6
CalError
ARng
mol/L
mV
% ppm
mg/L
°F
°C
TempError
AR
/pH
%
TP
RCL
S
2
1
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
17 As soon as a stable value is reached, the AR display indicator
stops flashing. The slope (mV) of the electrode for the measuring range II is displayed.
The probe symbol shows the evaluation of the three-point calibration for the measuring range II.
2
1
2
Auto
ConCal
2
Store
ISE
U
pH
1
4
CalError
ARng
mol/L
mV
% ppm
mg/L
°F
°C
TempError
AR
/pH
%
TP
RCL
S
3
1
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
18 To return to the measuring mode: Press the <M> key.
Note
You can prematurely terminate the three-point calibration by pressing
<M>. The values of the two-point calibration will then remain stored.
2
2
2
Auto
ConCal
3
Store
40
pH/ 3400i Operation
4.5 Calibration interval (Int 3)
The flashing probe symbol reminds you to calibrate regularly (pH/
ORP). When the fixed calibration interval (Int 3) has expired, the probe
symbol flashes. It is still possible to measure. The calibration interval is
set to 7 days in the factory.
Note
To ensure the high measuring accuracy of the measuring system, cal-
ibrate after the calibration interval has expired.
Setting the calibration
interval
You can change the interval set in the factory (1 ... 999 days):
1 Switch off the measuring instrument.
2 Press the <M> key and hold it down.
3 Press the <ON/OFF> key.
The display test appears briefly on the display. After this, the
measuring instrument automatically switches over to configuration.
4 Press the <RUN/ENTER> key repeatedly until Int 3 appears.
Example:
ISE
U
pH
3n
7
mol/L
mV/pH
% ppm
°F
°C
CalError
ARng
mg/L
%
TempError
RCL
AR
TP
S
I
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
d
t
2
Auto
ConCal
d
Store
5 Set the required interval (in days) until the next calibration with
<▲> <▼>.
6 Confirm with <RUN/ENTER>.
7 Switch to the measuring mode with <M>.
41
Operation pH/ 3400i
4.6 Saving
The measuring instrument has an internal data memory. It can store up
to 500 data records.
A complete data record consists of:
z Number of the storage location
z Date/time
z Measured value
z Temperature
z Temperature measuring procedure
z ID number
You can transmit measured values (data records) to the data storage
in two ways:
z Save manually
z Switch on AutoStore (Int 1), (see page 44).
Note
If you connect a recorder (analog output), the output on the digital interface is switched off.
4.6.1 Saving manually
You can transmit a measured value to the data storage as follows:
1 Press the <STO> key.
The current number (location number No.) of the next free storage location appears under the current measured value on the
display.
ISE
U
pH
29
4
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
1
Time
Day.Month
Year
LoBat
6
Baud
No.
Ident
8
AutoCal DIN
AutoCal TEC
9
2
Auto
ConCal
4
Store
42
2 Confirm with <RUN/ENTER>.
The display switches to entering the ID number.
pH/ 3400i Operation
ISE
U
pH
29
2
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
6
1
Baud
Time
No.
Day.Month
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
3 Using <▲> <▼>, set the required ID number
(1 ... 999).
4 Confirm with <RUN/ENTER>.
The measured values are stored. The instrument changes to
the measuring mode.
8
9
2
Auto
ConCal
4
Store
Message StoFull
StoFull This message appears when all of the 500 storage locations are occu-
StoFullStoFull
pied.
You have the following options:
Saving the current measured value.
The oldest measured value (storage location 1)
will be overwritten by this
Returning to the measuring mode without saving press any key
Outputting the data storage see
Clearing the memory see
Press
<RUN/ENTER>
section 4.6.3
section 4.6.4
43
Operation pH/ 3400i
4.6.2 Switching on AutoStore (Int 1)
The save interval (Int 1) determines the chronological interval between
automatic save processes. After the fixed interval has expired, the current data record is transmitted to the internal storage and to the interface.
Setting the
save interval
The default setting for the save interval (Int 1) is OFF.
By this, the AutoStore function is switched off.
To switch the function on, set an interval (5 s, 10 s, 30 s, 1 min, 5 min,
10 min, 15 min, 30 min, 60 min):
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <STO> key. Int 1 appears on the display.
ISE
UpH
1n
f
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
I
1
Baud
Time
No.
Day.Month
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
3 Set the required interval between the saving procedures with
<▲> <▼> (Selection: 5 s, 10 s, 30 s, 1 min, 5 min, 10 min,
15 min, 30 min, 60 min).
8
t
O
Auto
ConCal
f
Store
44
4 Confirm with <RUN/ENTER>.
The number of free memory locations appears on the display.
ISE
U
pH
94
E
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
I
1
Baud
Time
No.
Day.Month
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
5 Confirm with <RUN/ENTER>.
The prompt for the ID number appears on the display.
F
9
r
Auto
ConCal
E
Store
pH/ 3400i Operation
ISE
U
pH
9
1
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
°F
%
°C
TempError
AR
TP
RCL
S
4
I
1
Baud
Time
No.Day.Month
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
6 Set the required ID number with <▲> <▼>.
7 Confirm with <RUN/ENTER>.
The measuring instrument switches to the last active measuring mode and starts the measuring and saving procedure. AutoStore flashes on the display.
9
r
Auto
ConCal
EF
Store
As soon as all of the 500 storage locations are occupied, AutoStore is
terminated (Int 1 = OFF). If there are not enough storage locations
available for your measurements:
z Output and backup the data storage (see page 46) and
z Clear the memory (see page 52).
Note
The AutoStore function is interrupted if you start other functions, e.g.
output the data storage. After the function is finished, the AutoStore
function is continued. By this, however, temporal gaps in the recording
of the measured values will occur.
Switching off AutoStore Switch AutoStore off by:
z setting the save interval (Int 1) to OFF, or
z switching the measuring instrument off and then on again.
45
Operation pH/ 3400i
4.6.3 Outputting the data storage
You can output the contents of the data storage:
z Stored data on the display
z Calibration data on the display
z Stored data on the serial interface
z Calibration protocol to the interface
Outputting stored data
on the display
1 Press the <RCL> key repeatedly until StO dISP appears on the
display.
TDS
S
T
S
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
2 Press the <RUN/ENTER> key.
A measured value appears on the display.
The storage location of the data record is displayed for approx.
2 s, then the respective temperature appears.
ISE
Lin
d
Tref20
Cal
I
AutoCal DIN
AutoCal TEC
U
pH
S
6
1
Baud
Time
Day.Month No.
Year
LoBat
Ident
AutoCal DIN
AutoCal TEC
8
2
Auto
ConCal
OUpH
O
s
6
4
Store
Sal
mV/pH
%
m
mbar
1/
°
F
p
Auto
ARng
68
°F
°C
8
CalError
ARng
mg/l
S/
cm
cm
M
Sal
cm
°
K
%
/
C
Store
AR
RCL
mol/L
mV/pH
% ppm
mg/L
%
TempError
AR
TP
TP
RCL
46
You can perform the following activities:
Display further data of the data record
(ID number, date, time, storage location)
Advance one data record
(storage location)
Go back one data record (storage location) Press <▼ >
Press <RUN/ENTER>
Press <▲>
pH/ 3400i Operation
Note
If you want to search for a certain element of the data record (e.g. date),
proceed as follows:
1 Using <RUN/ENTER>, select the element (e.g. date).
2 Press <▲> or <▼> repeatedly until the required element ap-
pears on the display.
After approx. 2 s the temperature of the displayed measured
value appears.
Outputting stored data
to the interface
1 Press the <RCL> key repeatedly until Sto SEr appears on the
display.
TDS
S
t
S
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
2 Press the <RUN/ENTER> key.
The complete contents of the storage are transmitted to the interface. During the data transmission the instrument increments the storage numbers. After the data transmission, the
instrument automatically switches to the last active measurement mode.
Note
You can cancel the transmission with <M> or <RUN/ENTER>.
Lin
Tref20
Cal
S
AutoCal DIN
AutoCal TEC
OUpH
o
E
Sal
mV/pH
%
m
mbar
1/
°
F
R
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
The transmitted data contains the entire contents of the storage in incrementing order of the location numbers.
47
Operation pH/ 3400i
Sample printout:
No. 1:
09.03.99 17:10
pH 10.013 25 °C
Tman AR
Ident : 1
No. 2:
09.03.99 17:11
pH 10.104 24.7 °C
Tauto AR
Ident : 1
No. 3:
09.03.99 17:12
305.2 mV
Tauto
Ident : 13
...
Outputting the
calibration data
on the display
1 Press the <RCL> key repeatedly until CAL disp appears on the
display.
ISE
UpH
S
mol/L
mV/pH
% ppm
mg/L
0
1
Baud
Time
No.
Day.Month
Year
Ident
d
AutoCal DIN
LoBat
AutoCal TEC
2 Press the <RUN/ENTER> key.
The data of the last calibration of all measured variables appears in the following sequence:
z pH: Slope SLO and asymmetry ASY
z ISE: Slope of the electrode for calibration range I (SLO1)
Information concerning the calibration procedure is output as
well.
Auto
ConCal
and calibration range II (SLO2)
A
s
Store
LC
pi
°F
°C
CalError
ARng
%
TempError
AR
TP
RCL
48
pH/ 3400i Operation
ISE
U
pH
45
0
CalError
ARng
4
y
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
°F
%
°C
TempError
AR
mol/L
mV/pH
mV
% ppm
mg/L
°F
%
°C
TempError
AR
TP
RCL
TP
RCL
S
-
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
3 Press <RUN/ENTER> to display the value of the asymmetry
(mV).
ISE
8
s
Auto
ConCal
U
pH
9
L
Store
S
5
6
1
Baud
Time
Day.Month No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
8
9
a
Auto
ConCal
s
Store
4 Press <RUN/ENTER> to display the slope of the ion selective
electrode in the calibration range I.
ISE
U
pH
4
1
CalError
ARng
mol/L
mV
% ppm
mg/L
°F
%
°C
TempError
AR
/pH
TP
RCL
S
1
2
s
3
L
Auto
ConCal
O
Store
1
Baud
Time
Day.Month
No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
5 Press <RUN/ENTER> to display the slope of the ion selective
electrode in the calibration range II.
49
Operation pH/ 3400i
ISE
U
pH
4
2
CalError
ARng
mol/L
mV
% ppm
mg/L
°F
°C
TempError
AR
/pH
%
TP
RCL
S
1
2
s
3
L
Auto
ConCal
O
Store
1
Baud
Time
Day.Month
No.
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
6 With <M> you can switch back to the last active measuring
mode.
50
pH/ 3400i Operation
Outputting the calibra-
tion protocol on the
interface
1 Press the <RCL> key repeatedly until CAL SEr appears on the
display.
ISE
UpH
S
mol/L
mV/pH
% ppm
mg/L
0
1
Baud
Time
No.
Day.Month
Year
Ident
d
AutoCal DIN
LoBat
AutoCal TEC
2 Press the <RUN/ENTER> key.
The calibration protocol for all measured variables is transmitted to the interface. After the data transmission, the instrument
automatically switches to the last active measurement mode.
Sample printout:
Auto
ConCal
A
e
Store
LC
rs
°F
°C
CalError
ARng
%
TempError
AR
TP
RCL
CALIBRATION PROTOCOL
02.03.01 14:19
Device No.: 12345678
Calibration pH
Cal time: 01.10.01 / 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 174.1 mV 25.0°C
C2 -133.3 mV 25.0°C
S1 -59.4 mV/pH
ASY1 - 4 mV
Probe: +++
CALIBRATION ISE
Cal time: 01.10.01 / 15:30
Std 1 10,00 mg/l
Std 2 20,00 mg/l
Std 3 50,00 mg/l
C1 0,5 mV 25.0°C
C2 8,4 mV 24.9°C
C3 21,2 mV 25.0°C
S1 26.4 mV
S2 32,1 mV
Probe: +++
51
Operation pH/ 3400i
4.6.4 Clearing the memory
With this function, you can delete stored data records. 500 storage locations will then be available again.
Note
The Clear memory function only appears when there are data records
stored in the memory. Otherwise, the measuring instrument automatically switches to the last active measuring mode.
Proceed as follows to clear all data records:
1 Switch off the measuring instrument.
2 Press the <STO> key and hold it down.
3 Press the <ON/OFF> key.
The display test appears briefly on the display.
ISE
UpH
oS
rc
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
0
1
Baud
Time
No.
Day.Month
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
4 Confirm the clearing process with <RUN/ENTER>.
Pressing any other key prevents the clearing, the data records
will remain stored.
Note
The calibration data remain stored and can be called up.
d
t
l
Auto
ConCal
Store
52
pH/ 3400i Operation
4.7 Transmitting data
You have the following possibilities of transmitting data:
z One of the following options:
– With the AutoStore function (page 44), measured values are
periodically saved internally (save interval Int 1) and output on the
interface.
– With the Data transmission interval function (Int 2), measured
values are periodically output on the interface (see below).
z With the Output data storage function (page 46), calibration data or
saved measured values are output on the interface.
4.7.1 Data transmission interval (Int 2)
The interval to the data transmission (Int 2) determines the chronological interval between automatic data transmissions. After the selected
interval expires, the current data record is transmitted to the interface.
Setting the
Data transmission
interval
Note
The setting of the interval (Int 2) is only effective if the save interval
(AutoStore function) is switched off!
The default setting for the interval is OFF.
To start the data transmission, set an interval (5 s, 10 s, 30 s, 1 min, 5
min, 10 min, 15 min, 30 min, 60 min):
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <RCL> key. Int 2 appears on the display.
ISE
UpH
2n
fO
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
1
Time
Day.Month
Year
LoBat
I
Baud
No.
Ident
8
AutoCal DIN
AutoCal TEC
t
f
Auto
ConCal
Store
3 Set the required interval between the saving procedures with
<▲> <▼>.
4 Confirm with <RUN/ENTER>.
The measuring instrument switches to the last active measuring mode.
53
Operation pH/ 3400i
S
Note
When the AutoStore function is active at the same time, the data transmission is performed according to the setting of the save interval (Int 1).
Set the save interval (Int 1) to OFF to activate the Data transmission in-
terval (Int 2).
4.7.2 PC/external printer (RS232 interface)
Via the RS 232 interface, you can transmit the data to a PC or an external printer. Use the AK340/B (PC) or AK325/S (ext. printer) cable to
connect the interface to the instruments. The data output automatically
switches to the RS232 interface.
Warning
The RS232 interface is not galvanically isolated.
When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result.
Socket assignment
Set up the following transmission data on the PC/printer:
Baud rate selectable between: 1200, 2400, 4800, 9600
Handshake RTS/CTS + Xon/Xoff
Parity none
Data bits 8
Stop bits 2
Cable length Max. 15 m
1 CT
2 RxD
2
1
4
RS 232
REC
3
3 Ground
4TxD
54
pH/ 3400i Operation
4.7.3 Remote control
The measuring instrument can be remotely controlled from a PC. This
requires the KOM pilot communication kit. It is available as an accessory. The instrument is then controlled via commands that simulate
keystrokes and request the current display contents.
Note
A more detailed description is provided within the scope of delivery of
the communication kit.
55
Operation pH/ 3400i
4.8 Configuration
You can adapt the measuring instrument to your individual requirements. To do this, the following parameters can be changed (the status
on delivery is marked in bold):
Baud rate 1200, 2400, 4800, 9600
Display during the
pH calibration
Intervals
Calibration (Int 3)
in days (d)
Date/time Any
Note
You can leave the configuration menu at any time with <M>. The parameters that have already been changed are stored.
1 Switch off the measuring instrument.
2 Press the <M> key and hold it down.
3 Press the <ON/OFF> key.
The display test appears briefly on the display. The measuring
instrument then switches automatically to the setting of the
baud rate.
Buffer nominal value, or current
electrode voltage
– pH: 1 ... 7 ... 999 d Int 3
– ISE: no interval
56
Baudrate
TDS
S
t
n
1
Baud
Time
Day.Month No.
Year
Ident
Tref25
LoBat
nLF
4 Select the required Baud rate with <▲> <▼>.
5 Confirm with <RUN/ENTER>. CAL dISP appears on the dis-
play.
Lin
4
Tref20
Cal
8
AutoCal DIN
AutoCal TEC
OUpH
2
0
Sal
mV/pH
%
m
mbar
1/
°
F
0
Auto
ARng
mg/l
S/
cm
M
cm
°
%
C
Store
AR
cm
Sal
K
/
RCL
TP
pH/ 3400i Operation
ISE
UpH
LC
pi
°F
°C
CalError
mol/L
mV/pH
/pH
% ppm
mg/L
TP
%
TempError
RCLARng
AR
S
0
1
Baud
Time
No.
Day.Month
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
6 Select the required display during the pH calibration with
<▲> <▼>.
mV: Display of the current electrode voltage
/pH: Display of the buffer nominal value.
7 Confirm with <RUN/ENTER>. On the display, Int 3 appears.
A
sd
Auto
ConCal
Store
Calibration
intervals
Date and time
ISE
U
pH
3n
8
CalError
ARng
4
4
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
°F
%
°C
TempError
AR
mol/L
/pH
mV
% ppm
mg/L
°F
%
°C
TempError
AR
TP
RCL
TP
RCL
S
I
1
Baud
Time
Day.Month No.
Year
Ident
d
AutoCal DIN
LoBat
AutoCal TEC
8 Set the required interval (in days) with <▲> <▼>.
9 Confirm with <RUN/ENTER>. The date flashes on the display.
ISE
U
2
Auto
pH
t
d
Store
ConCal
S
1
2
0
3
9
Auto
ConCal
0
Store
1
Time
Year
LoBat
Baud
No.Day.Month
Ident
AutoCal DIN
AutoCal TEC
10 Set the date of the current day with <▲> <▼>.
11 Confirm with <RUN/ENTER>.
The date (month) flashes on the display.
12 Set the current month with <▲> <▼>.
57
Operation pH/ 3400i
13 Confirm with <RUN/ENTER>.
The year appears on the display.
14 Set the current year with <▲> <▼>.
15 Confirm with <RUN/ENTER>.
The hours flash on the display.
16 Set the current time with <▲> <▼>.
17 Confirm with <RUN/ENTER>.
The minutes flash on the display.
18 Set the current time with <▲> <▼>.
19 Confirm with <RUN/ENTER>.
The measuring instrument switches to the last active measuring mode.
58
pH/ 3400i Operation
4.9 Reset
You can reset (initialize) the measurement parameters and the configuration parameters separately from one another.
Measurement
parameters
pH
Configuration
parameters
The following measuring parameters are reset to the delivery status:
Measuring mode pH
Slope -59.16 mV/pH
Asymmetry 0 mV
Manual temperature input 25 °C
Resolution of pH display 0.001 (high resolution)
Note
The calibration data gets lost when the measuring parameters are reset. Recalibrate after performing a reset.
The following configuration parameters (InI) are reset to the delivery
status:
Baud rate 4800
Display during the
Buffer nominal value
pH calibration
Interval 1
(automatic save) OFF
Interval 2
(for data transmission) OFF
59
Operation pH/ 3400i
Resetting the
measuring parameters
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <CAL> key. The setting to reset the pH measuring
parameters appears on the display.
ISE
U
pH
1I
o
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
S
I
1
Baud
Time
No.
Day.Month
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
3 Using <▲> <▼>, toggle between no and YES.
YES: Resetting the pH measuring parameters
no: Retaining settings.
4 Confirm with <RUN/ENTER>.
The measuring instrument switches to the configuration parameters.
8
n
O
Auto
ConCal
n
Store
60
pH/ 3400i Operation
Resetting the
configuration parame-
ters
1
ISE
S
I
Baud
Time
No.
Day.Month
Year
Ident
AutoCal DIN
LoBat
AutoCal TEC
5 Using <▲> <▼>, toggle between no and YES.
YES: Resetting the configuration parameters
no: Retaining settings.
6 Confirm with <RUN/ENTER>.
The measuring instrument automatically switches to the last
active measuring mode.
8
pH
U
O
Auto
ConCal
n
n
Store
1I
o
°F
°C
CalError
ARng
mol/L
mV/pH
% ppm
mg/L
TP
%
TempError
RCL
AR
61
Operation pH/ 3400i
62
pH/ 3400i Maintenance, cleaning, disposal
5 Maintenance, cleaning, disposal
5.1 Maintenance
The measuring instrument is almost maintenance-free.
The only maintenance task is replacing the batteries.
LoBat on the display indicates that the batteries should be changed.
The batteries are then largely depleted.
Replacing the batteries
2
1
1 Open the housing after the instrument has been switched off:
– Undo the four screws on the underside of the instrument
– Pull down the lower cover (1).
2 If necessary, take the four depleted batteries (2) out of the bat-
tery compartment.
3 Place four new batteries (type Mignon AA) in the battery com-
partment.
4 Close the lower cover (1).
Warning
Make sure that the poles of the batteries are the right way round.
The
± signs on the batteries must correspond to the ± signs in the bat-
tery compartment. Only use leakproof alkaline manganese batteries.
63
Maintenance, cleaning, disposal pH/ 3400i
Note
For maintenance of electrodes and ion-selective electrodes, follow the
corresponding operating manual.
5.2 Cleaning
Occasionally wipe the outside of the measuring instrument with a
damp, lint-free cloth. Disinfect the housing with isopropanol as required.
Warning
The housing is made of a synthetic material (ABS). Thus, avoid contact
with acetone and similar detergents that contain solvents. Remove any
splashes immediately.
5.3 Disposal
Packing This measuring instrument is sent out in a protective transport packing.
We recommend: Keep the packing material. The original packing protects the instrument against damage during transport.
Batteries This note refers to the battery regulation that applies in the Federal Re-
public of Germany. We would ask end-consumers in other countries to
follow their local statutory provisions.
Note
This instrument contains batteries. Batteries that have been removed
must only be disposed of at the recycling facility set up for this purpose
or via the retail outlet.
It is illegal to dispose of them in household refuse.
Measuring instrument Dispose of the measuring instrument as electronic waste at an appro-
priate collection point. It is illegal to dispose of the instrument in household refuse.
64
pH/ 3400i What to do if...
6 What to do if...
6.1 pH system messages
Error message 0FL
0FL
0FL0FL
Cause Remedy
pH electrode:
– Not connected – Connect electrode
Error message E3
E3
E3E3
– Air bubble in front of the
– Remove air bubble
diaphragm
– Air in the diaphragm – Extract air or
moisten diaphragm
– Cable broken – Replace electrode
– Gel electrolyte dried out – Replace electrode
Cause Remedy
Electrode
– Diaphragm contaminated – Clean diaphragm
– Membrane contaminated – Clean membrane
– Moisture in the plug – Dry plug
– Electrolyte out of date – Replenish electrolyte or
replace electrode
– Electrode worn out – Replace electrode
– Electrode broken – Replace electrode
Measuring instrument:
– Incorrect calibration procedure – Select correct procedure
– Incorrect solution temperature
– Set up correct temperature
(without temperature sensor)
– Socket damp – Dry socket
65
What to do if... pH/ 3400i
Buffer solutions
– Incorrect buffer solutions – Change calibration procedure
– Buffer solutions too old – Use only once.
Note the shelf life
– Buffer solutions depleted – Change solutions
No stable measured
Cause Remedy
value
pH electrode:
– Diaphragm contaminated – Clean diaphragm
– Membrane contaminated – Clean membrane
Obviously incorrect
measured values
Test sample:
– pH value not stable – Measure with air excluded if
necessary
– Temperature not stable – Adjust temperature if
necessary
Electrode + test sample:
– Conductivity too low – Use suitable electrode
– Temperature too high – Use suitable electrode
– Organic liquids – Use suitable electrode
Cause Remedy
pH electrode:
– pH electrode unsuitable – Use suitable electrode
– Temperature difference
between buffer and test
– Adjust temperature of buffers
or test samples
sample too high
66
– Measurement procedure not
suitable
– Follow special procedure
pH/ 3400i What to do if...
6.2 ISE system messages
Error message 0FL
0FL
0FL0FL
Cause Remedy
Ion-selective electrode:
– Not connected – Connect the electrode
– Cable broken – Replace the electrode
Error message E3
E3
E3E3
Cause Remedy
Ion-selective electrode:
Concentration
display flashes
– Slope not in the range
50 ... 70 mV or
– Replace the electrode
– recalibrate
23 ... 35 mV
– Moisture in the plug – Dry plug
– Electrode obsolete – Replace the electrode
– Electrode broken – Replace the electrode
Measuring instrument:
– Calibration procedures:
– Select the correct order
Incorrect order of the
standards with 3-point
calibration
– Socket damp – Dry socket
Cause Remedy
In measurement:
– The measured value is outside
the range determined through
calibration
– Select the calibration
standards so that the
measured value is in between
them
In calibration:
U2 U1– 5mV≤
U3 U2– 5mV≤
– Calibration standards lie too
closely together. Select other
calibration standards
67
What to do if... pH/ 3400i
TP and Temp Error flash
Calibration Std 2 flashes
Calibration Std 3 flashes
Cause Remedy
In calibration:
– Calibration standards do not
have the correct temperature
(max. temperature difference
– Temper the calibration
standards
±
2 °C)
In measurement:
– Test sample does not have the
– Temper the test sample
correct temperature (max.
temperature difference
± 2 °C)
Cause Remedy
– Standard 2 = Standard 1 – Use different calibration
standards
Cause Remedy
Display LoBat
Instrument does not
react
to keystroke
Requirement not met:
– Use different standard 3
– Standard 3 > Standard 2, if Std
2 > Std 1 or
– Standard 3 < Standard 2, if Std
2 < Std 1
6.3 General errors
Cause Remedy
– Batteries almost empty – Exchange the batteries (see
section 5.1 M
Cause Remedy
– Operating condition undefined
or EMC load unallowed
– Processor reset:
Switch the instrument on
while pressing the <CAL> key
AINTENANCE)
68
pH/ 3400i What to do if...
Display to
to
toto
Cause Remedy
– Time-out of the interface – Check the instrument that is
connected
Probe symbol flashes
Cause Remedy
– Calibration interval expired – Recalibrate the measuring
system
Message StoFull
StoFull
StoFullStoFull
Cause Remedy
– All memory locations are full – Output data storage and clear
data storage
69
What to do if... pH/ 3400i
70
pH/ 3400i Technical data
7 Technical data
Dimensions and weight
Length [mm] 172
Width [mm] 80
Height [mm] 37
Weight [kg] Approx. 0.3
Mechanical structure
Electrical safety
Ambient
conditions
pH/ORP measuring
ranges
Type of protection IP 66
Protective class III
Storage - 25 °C ... + 65 °C
Operation -10 °C ... + 55 °C
Climatic class 2
Measuring range Resolution
pH - 2.000 ... + 19.999
- 2.00 ... + 19.99
U [mV] - 999.9 ... + 999.9
- 1999 ... + 1999
0.001
0.01
0.1
1
T [°C] - 5.0 ... + 105.0 0.1
Precision of pH/ORP
(± 1 digit)
pH (± 2 pH units from
± 0.003 at + 15 °C ... + 35 °C
the calibration point)
U [mV] ± 0.2 at + 15 °C ... + 35 °C
± 0.1
T [°C] NTC 30:
± 0.1
PT 1000:
± 0.5 at 0 °C ... 15 °C
± 0.1 at 15 °C ... 35 °C
± 1 at 35 °C ... 55 °C
71
Technical data pH/ 3400i
pH temperature input:
ISE measuring ranges
- 20 °C ... + 130 °C
Measuring range 1
Resolution
Measuring range 2
Resolution
Measuring range 3
Resolution
Measuring range 4
Resolution
Usable
ISE electrodes
ISE calibration
procedure
Combination and double electrodes with connector according to DIN
19262
Two point calibration or three point calibration with standards suiting
the sample
ISE slope ranges ± 25 to 35 mV and ±50 to 70 mV
0.000 ... 9.999 mg/l
0.001 mg/l
0.00 ... 99.9 mg/l
0.01 mg/l
0.0 ... 999.9 mg/l
0.1 mg/l
0 ... 1999 mg/l
1mg/l
Analog output Automatic switchover when the recorder is connected by the cable,
AK 323.
Output signals 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)
72
pH/ 3400i Technical data
Serial
interface
Power supply
Automatic switchover when a PC or a printer is connected via the cable,
AK 340/B or AK 325/S.
Type RS232, data output
Baud rate Selectable 1200, 2400, 4800, 9600 baud
Data bits 8
Stop bit 2
Parity None
Handshake RTS/CTS + Xon/Xoff
Cable length Max. 15m
Batteries 4 x 1.5 V alkali-manganese batteries, type
AA
Operational life Approx. 3000 operating hours
Mains (optional) The following specifications apply to all
plug-in power supplies:
Max. overvoltage connection 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
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
73
Technical data pH/ 3400i
Guidelines
and norms used
EMC E.C. guideline 89/336/EEC
EN 61326-1:1997
EN 61000-3-2 A14:2000
EN 61000-3-3:1995
FCC Class A
Instrument safety E.C. guideline 73/23/EEC
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 Part 15 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.
74
Test certificates
cETLus, CE
pH/ 3400i Lists
8Lists
This chapter provides additional information and orientation aids.
Abbreviations The list of abbreviations explains the indicators and the abbreviations
that appear on the display and in the manual.
Specialist terms The glossary briefly explains the meaning of the specialist terms. How-
ever, terms that should already be familiar to the target group are not
described here.
Index The index will help you to find the topics that you are looking for.
75
Lists pH/ 3400i
Abbreviations
AR AutoRead (drift control)
ARng Automatic range switching
Measuring instrument measures with highest resolution
ASY Asymmetry
AutoCal DIN Automatic pH calibration with buffer solutions pre-
pared according to DIN 19 266
AutoCal TEC Automatic pH calibration with WTW technical buff-
er solutions according to DIN 19267
°C Temperature unit, degrees Celsius
Cal Calibration
Cd... Display indicator during calibration for pH mea-
surements. Indicates the selection of the buffer
data record for buffer solutions prepared according
to DIN 19 266
Cm... Display indicator during calibration for pH mea-
surements. Indicates the selection of buffer data
records for buffer solutions of the Merck company
ConCal Conventional single-point or two-point calibration
for pH measurements
Ct... Display indicator during calibration for pH mea-
surements. Indicates the selection of the buffer
data records for WTW technical buffer solutions
E3 Error message
see chapter 6 W
HAT TO DO IF...
InI Initialization
Resets individual basic functions to the status they
had on delivery
ISE Ion sensitive electrode
LoBat Batteries almost empty(Low Battery)
mV Voltage unit
mV/pH Unit of the electrode slope (internat. mV)
76
OFL Display range exceeded (Overflow)
pH pH value
pH/ 3400i Lists
S Slope (internat. k)
SELV Safety Extra Low Voltage
SLO Slope setting on calibration
TP Temperature measurement active (Temperature
Probe)
U
ASY
Asymmetry
77
Lists pH/ 3400i
Glossary
Adjusting To manipulate a measuring system so that the relevant value (e. g. the
displayed value) differs as little as possible from the correct value or
a value that is regarded as correct, or that the difference remains within the tolerance.
Asymmetry Designation for the offset potential of a pH electrode. It is the measur-
able potential of a symmetrical electrode, the membrane of which is
immersed in a solution with the pH of the nominal electrode zero point
(WTW electrodes: pH = 7).
AutoRange Name of the automatic selection of the measuring range.
AutoRead WTW name for a function to check the stability of the measured value.
Calibration Comparing the value from a measuring system (e. g. the displayed
value) to the correct value or a value that is regarded as correct. Often, this expression is also used when the measuring system is adjusted at the same time (see adjusting).
Diaphragm The junction is a porous body in the housing wall of reference elec-
trodes or electrolyte bridges. It forms the electrical contact between
two solutions and makes electrolyte exchange more difficult. The expression, junction, is also used for ground or junction-less transitions.
Electrode zero point The zero point of a pH electrode is the pH value at which the electro-
motive force of the pH electrode at a specified temperature is zero.
Normally, this is at 25 °C.
Electromotive force of
an electrode
The electromotive force U of the electrode is the measurable electromotive force of an electrode in a solution. It equals the sum of all the
galvanic voltages of the electrode. Its dependency on the pH results
in the electrode function which is characterized by the parameters,
slope and zero point.
Measured parameter The measured parameter is the physical dimension determined by
measuring, e. g. pH, conductivity or D. O. concentration.
Measured value The measured value is the special value of a measured parameter to
be determined. It is given as a combination of the numerical value and
unit (e. g. 3 m; 0.5 s; 5.2 A; 373.15 K).
Measuring system The measuring system comprises all the devices used for measuring,
e. g. measuring instrument and probe. In addition, there is the cable
and possibly an amplifier, terminal strip and armature.
78
Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol-
vent.
MultiCal
®
WTW name stating that a measuring instrument provides several calibration procedures.
pH/ 3400i Lists
Offset potential The measurable potential of a symmetrical electrode, the membrane
of which is immersed in a solution with the pH of the nominal electrode
zero point. The asymmetry is part of the offset potential.
ORP voltage The ORP is caused by oxidizing or reducing substances dissolved in
water if these substances become effective on an electrode surface
(e. g. a gold or platinum surface).
pH value The pH is a measure of the acidic or basic effect of an aqueous solu-
tion. It corresponds to the negative decadic logarithm of the molal hydrogen ions activity divided by the unit of the molality. The practical pH
value is the value of a pH measurement.
Potentiometry Name of a measuring technique. The signal (depending on the mea-
sured parameter) of the electrode is the electrical potential. The electrical current remains constant.
Reference
temperature
Fixed temperature value to compare temperature-dependent measured values. For conductivity measurements, the measured value is
converted to a conductivity value at a reference temperature of 20 °C
or 25 °C.
Reset Restoring the original condition of all settings of a measuring system.
Resolution Smallest difference between two measured values that can be dis-
played by a measuring instrument.
Slope The slope of a linear calibration function.
Standard solution The standard solution is a solution where the measured value is
known by definition. It is used to calibrate a measuring system.
Temperature
Value of the slope of a linear temperature function.
coefficient
Temperature function Name of a mathematical function expressing the temperature behav-
ior of a test sample, a probe or part of a probe.
Test sample Designation of the sample ready to be measured. Normally, a test
sample is made by processing the original sample. The test sample
and original sample are identical if the test sample was not processed.
79
Lists pH/ 3400i
80
pH/ION 3400i Index
A
Asymmetry 20
Auslieferzustand 59
Authorized use 11
AutoCal DIN 20, 26
AutoCal TEC 20, 22
AutoRead 17
ISE measurement 33
C
Calibration evaluation 21
Calibration interval 41
Calibration procedures 20
Calibration protocol 20
ISE 35
ConCal 20, 29
ConCal (ISE measurement)
34
Concentration, measuring 33
Conductivity/Resistance 54
Connecting a printer 54
Connecting the original plugin power supply unit
14
D
Data record 42
Data transmission (interval)
53
Display 9
Drift control 17
ISE measurement 33
E
Energy saving feature 15
Error messages 67
I
Initial commissioning 13
Initialization 59
Interval
calibration
data transmission 53
save 44
Ion concentration, measuring
33
ISE calibration 34
41
ISE calibration evaluation 35
K
Keys 8
M
Measuring accuracy 41
O
Operating 10
Operating safety 12
ORP electrode 19
ORP voltage 19
P
Printing
calibration protocol
20
R
Remote control 55
Replacing the batteries 63
Reset 59
Resetting the measuring parameters
RS232 interface 54
60
S
Safety 11
safety precautions 11
Save interval 44
Scope of delivery 13
Setting the baud rate 56
Setting the date 13, 57
Setting the resolution (pH) 17
Setting the time 13, 57
single-point calibration 20
Single-point calibration (pH)
20, 24, 27, 29
Slope 20
T
Temperature sensor 16, 32
Three-point calibration
ConCal (ISE measure-
ment)
39
Two-point calibration
ConCal
ConCal (ISE measure-
two-point calibration 20
Two-point calibration (pH)
29
ment)
37
20, 24, 27, 29
81
Index pH/ION 3400i
82
Wissenschaftlich-Technische Werkstätten GmbH
Dr.-Karl-Slevogt-Straße 1
D-82362 Weilheim
Germany
Tel: +49 (0) 881 183-0
+49 (0) 881 183-100
Fax: +49 (0) 881 183-420
E-Mail: Info@WTW.com
Internet: http://www.WTW.com
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