wtw pH/Cond 340i User manual

ba52312e02 03/2004
pH/Cond 340i
ba52312e
Operating manual
AR
RCL
STO
CAL
M
O
AR
S/
cm
Tref25
nLF
0
5
2
30
5
°
C
TP
pH/Conductivity measuring instrument

Accuracy when
going to press 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.
Warranty We guarantee the instrument described for 3 years from the date of
purchase.
The instrument warranty covers manufacturing faults that are discov-
ered within the warranty period. The warranty does not cover compo-
nents 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 2004, 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 340i Contents
3
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

Contents pH/Cond 340i
4
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

pH/Cond 340i Overview
5
1Overview
1.1 General features
This compact precision handheld meter enables you to carry out pH /
ORP measurements and conductivity measurements rapidly and reli-
ably.
The handheld meter provides the maximum degree of operating com-
fort, 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 func-
tion support you in your work with the handheld meter.
Note
If you need further information or application notes, you can obtain the
following material from WTW:
lApplication reports
lPrimers
lSafety datasheets.
You will find information on available literature in the WTW catalog or
via the Internet.
1Keypad
2Sample display
3Jack field
AR
RCL
STO
CAL
M
O
AR
S/
cm
Tref25
nLF
0
5
2
30
5
°
C
TP
1
2
3

Overview pH/Cond 340i
6
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.

pH/Cond 340i Overview
7
Set (sample configuration):
1 pH/Cond 340i 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)

Overview pH/Cond 340i
8
1.3 Keypad
Key functions
RUN/ENTER
ARRCLCAL
STOM
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 <▼>
Confirm entries, start AutoRead
<RUN/ENTER>
M
STO
CAL
RCL
AR
RUN/ENTER

pH/Cond 340i Overview
9
1.4 Display
1.5 Jack field
1TetraCon 325 conductivity measuring cell
2pH electrode
3pH temperature sensor
4Plug-in power supply (optional)
5Serial interface RS 232
Sal
S
mg/l
M
cm
%
mbar
O
°
F
TDS
Time
Baud
Day.Month No.
Ident
Year
8
8.
8
88
8
°
C
LoBat
1
UpH
RCL
Auto
Store
ARng AR
S/
m
AutoCal DIN
AutoCalTEC
cm
Lin
Tref25 Tref20
nLF
Cal
mV/pH
Sal
1/
cm
/
K
%
TP
Status display
Meas. value display
Function and
temperature display
Probe symbol
5
123
4

Overview pH/Cond 340i
10
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 sen-
sor, 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.

pH/Cond 340i Safety
11
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the measur-
ing instrument. Consequently, all responsible personnel must read this
operating manual before working with the measuring system. The op-
erating manual must always be available within the vicinity of the mea-
suring 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 experi-
ence, 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 envi-
ronment.
Further notes
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating manu-
als.
2.1 Authorized use
The authorized use ofthe measuring instrument consists exclusivelyof
the pH and ORP measurement or the measurement ofthe conductivity
and salinity in the field and laboratory.
The technical specifications as given in chapter 7 TECHNICAL DATA
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.

Safety pH/Cond 340i
12
2.2 General safety instructions
This instrument is built and inspected according to the relevant guide-
lines 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 The smooth functioning and operational safety of the measuring instru- ment can only be guaranteed if the generally applicable safety mea-
sures and the specific safety instructions in this operating manual are
followed during operation.
The smooth functioning and operational safety of the measuring instru-
ment can only be guaranteed under the environmental conditions that
are specified in chapter 6 WHAT 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 func-
tioning of the instrument. In this event, wait until the temperature of the
instrument reaches room temperature before putting the instrument
back into operation.
Safe operation If safeoperationisno longerpossible,theinstrumentmustbe takenout
of service and secured against inadvertent operation!
Safe operation is no longer possible if the measuring instrument:
lhas been damaged in transport
lhas been stored under adverse conditions for a lengthy period of
time
lis visibly damaged
lno longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the instrument.
Obligations of the pur-
chaser The purchaser of the measuring instrument must ensure that the fol- lowing laws and guidelines are observed when using dangerous sub-
stances:
lEEC directives for protective labor legislation
lNational protective labor legislation
lSafety regulations
lSafety datasheets of the chemical manufacturers.

pH/Cond 340i Commissioning
13
3 Commissioning
3.1 Scope of delivery
l340i handheld meter
lPlug-in power supply (optional)
lOperating manual and short operating manual
l4 batteries, 1.5 V Mignon type AA (in the instrument)
For details of scope of delivery of SETs, see chapter 1.2 SETSOF
EQUIPMENT and WTW catalog.
3.2 Initial commissioning
Perform the following activities:
lSet the date and time
lConnect the plug-in power supply (optional)
Setting the date and
time 1Press the <M> key and hold it down.
2 Press the <ON/OFF> key.
The display test appears briefly on the display.
3Press the <RUN/ENTER> key repeatedly until the date ap-
pears on the display.
4 Set the date of the current day with <▲> <▼>.
5Confirm with <RUN/ENTER>.
The date (month) flashes in the display.
6 Set the current month with <▲> <▼>.
7Confirm with <RUN/ENTER>.
The year appears on the display.
8 Set the current year with <▲> <▼>.
9Confirm 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 <▲> <▼>.

Commissioning pH/Cond 340i
14
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 mea-
suring 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-inpower supply(see chapter 7 TECHNICAL DA-
TA).
Warning
Use original plug-in power supplies only (see
chapter 7 TECHNICAL DATA).
13 Confirm with <RUN/ENTER>.
The instrument switches to a measuring mode.
14 Switch the instrument off using <ON/OFF>.
1Plug the jack (1) into the socket (2) of the measuring instru-
ment.
2 ConnecttheoriginalWTW plug-in powersupply(3)toan easily
accessible mains socket.
2
1
3

pH/Cond 340i Operation
15
4 Operation
4.1 Switching on the measuring instrument
Measuring mode when
switching on
Note
The measuring instrument has an energy saving feature to avoid un-
necessary 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
lif the power is supplied by the plug-in power supply,
lif the AutoStore function is active,
lif the communication cable and a PC with a running communication
program are connected,
lif the printer cable is connected (for external printers).
1Press the <ON/OFF> key.
The display test appears briefly on the display.
After this, the measuring instrument automatically switches to
the measuring mode.
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

Operation pH/Cond 340i
16
4.2 pH value / ORP voltage
4.2.1 General information
Preparatory activities Perform the following preparatoryactivities when you wantto measure:
Note
Incorrect calibration of pH electrodes leads to incorrect measured val-
ues. Calibrate regularly before measuring. You can only connect elec-
trodes of the NTC30 type or without temperature sensor.
Warning
When connecting anearthed PC/printer, measurementscannot be per-
formed in earthed media as incorrect values would result. The RS232
interface is not galvanically isolated.
1Connect 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.
3Calibrate or check the measuring instrument with the elec-
trode.
4Using<▲> <▼>, toggle between the pH or mV measuring
modes.

pH/Cond 340i Operation
17
Temperature measure-
ment in pH measure-
ments
You can perform pH measurements with or without a temperature sen-
sor as well as with the temperature sensor of a conductivity measuring
cell. The measuring instrument recognizes which sensors are connect-
ed and automatically switches to the correct mode for the temperature
measurement.
The following cases are distinguishable.
* 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 calibratingwithouta temperaturesensor(noTPdisplayindicator
displayed), enter the current temperature of the respective buffer solu-
tion manually using the <▲> <▼>keys while keeping the <RUN/EN-
TER> key depressed.
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*

Operation pH/Cond 340i
18
4.2.2 Measuring the pH value
AutoRead AR
(drift control) The AutoRead function (drift control) checks the stability of the mea- surement signal. The stability has a considerable impact on the repro-
ducibility of the measured values.
For identical measurement conditions, the following criteria apply:
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the pH electrode in the test sample.
3Pressthe<▲> <▼>keysuntil pH appearsinthe statusdisplay.
The pH value appears on the display.
4When measuring without a connected temperature sensor:
Options:
lDetermine the current temperature using a thermometer
and, while keeping the <RUN/ENTER> key depressed, en-
ter this temperature value with <▲> <▼>.
lTP display indicator not displayed, socket for the second
probe is free:
Connect the second probe (Cond) and immerse it in the
same test sample. TP flashes, the temperature is automati-
cally measured using the second probe.
Tref20
Lin Cal
8
1
S
SalOU
%
mg/l
mV/pH
1/
cm
Sal
AutoCal DIN
Tref25
nLF
AutoCalTEC
RCL
Auto
Store
LoBat
ARng AR
Time
Baud
Day.Month No.
Ident
Year
mbar
TDS
cm
M
°
F
/
K
%
S/
m
cm
8
4
2
99
6
°
C
TP
pH
Reproducibility Response time
Better than 0.02 > 30 seconds
1Call 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 340i Operation
19
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
3Start 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>.
5To terminate the AutoRead function: Press the <AR> key.

Operation pH/Cond 340i
20
4.2.3 Measuring the ORP voltage
Inconjunctionwithan ORPelectrode,e.g.SenTixORP, themeasuring
instrument can measure the ORP voltage (mV) of a solution.
Note
ORP electrodes are not calibrated. However, you can check ORP elec-
trodes using a test solution.
1Perform the preparatory activities according to section 4.2.1.
2 Submerse the ORP electrode in the sample.
3Press the <▲> <▼>keys until the U status display appears.
The ORP voltage (mV) of the test sample appears on the dis-
play.
4 Wait for a stable measured value.
/pH
Tref20
Cal
8
TDS
S
8
1
pH SalO
%
mg/l
1/
cm
Sal
AutoCal DIN
Lin
Tref25
nLF
AutoCalTEC
RCL
Auto
Store
LoBat
ARng AR
Time
Baud
Day.Month No.
Ident
Year
mbar cm
M
°
F
/
K
%
S/
m
cm
8
4
2
23
°
C
TP
U
mV