Conductivity meter
CG 853
Operating Manual
ba12245e_2 09/99
75
Accuracy when
going to press
All details contained in this operating manual are valid data
at the time of going to press. However, SCHOTT may add
details for both technical and commercial reasons, or in order to fulfil legal requirements of different countries. This
does not affect the characteristics described.
Warranty
declaration
The designated instrument is covered by a warranty of three
years from the date of purchase.
The instrument warranty extends to manufacturing faults
that are determined within the period of warranty.
The warranty excludes components that are replaced during
maintenance such as batteries, etc.
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.
76
Copyright
© Hofheim SCHOTT Geräte GmbH 1999
Reprinting - even as excerpts - is only allowed with the
explicit written authorization of SCHOTT Geräte GmbH,
Hofheim.
Printed in Germany.
List of contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
1.1 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
1.3 Sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
1.4 Declaration of Conformity . . . . . . . . . . . . . . . . . . .82
1.5 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . .90
2.2 General safety instructions . . . . . . . . . . . . . . . . . .90
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . 93
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
4.1 Switch on the instrument . . . . . . . . . . . . . . . . . . . .95
4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
4.2.1 Conductivity . . . . . . . . . . . . . . . . . . . . . . . .99
4.2.2 Salinity . . . . . . . . . . . . . . . . . . . . . . . . . . .100
4.2.3 TDS (total dissolved solids) . . . . . . . . . . .101
4.2.4 Transmitting measured values . . . . . . . .102
4.3 Determining/setting up the cell constant [C] . . . .103
4.4 Storing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
4.4.1 Manual storage . . . . . . . . . . . . . . . . . . . . .114
4.4.2 Switching on AutoStore (Int 1) . . . . . . . . .116
4.4.3 Outputting the data storage . . . . . . . . . . .118
4.4.4 Clearing the storage . . . . . . . . . . . . . . . . .124
4.5 Data transmission . . . . . . . . . . . . . . . . . . . . . . . .125
4.5.1 Data transmission interval (Int 2) . . . . . . .125
4.5.2 Recorder (analog output) . . . . . . . . . . . . .127
4.5.3 PC/external printer (RS232 interface) . . .128
4.6 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
4.7 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .134
77
List of contents
5 Maintenance, cleaning, disposal . . . . . . . . . . . 137
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .137
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . 139
7 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
78
1Overview
Overview
The compact
perform conductivity measurements rapidly and reliably.
The
CG 853
fort, reliability and measuring safety for all applications.
The proven procedures to determine or set up the cell con-
stant support your work with the conductivity meter.
CG 853
provides the highest degree of operating com-
precision conductivity meter lets you
3
2
1
1 Keypad
2 Display
3 Sockets
Note
The measuring instrument can also be delivered as part of
a set. Information on this and other accessories is available
in the SCHOTT general catalog.
79
Overview
1.1 Keyboard
Measuring instrument ON/OFF
<on/off>
Select measuring mode
ì>
<
Set up or determine cell constant; select
temperature compensation <CAL>
Activate/deactivate AutoRead function
<auto read>
Store measured value
<STO>
Display/transmit measured values
<RCL>
Reduce values, scroll
▼>
<
Confirm inputs, start AutoRead
<run/enter>
80
Increase values, scroll
▲>
<
1.2 Display
1.3 Sockets
Overview
Status line
Measured value display
Function and
temperature displ a y
1
23
Connections:
1 8 pole socket with pin contacts
2 RS 232 interface/analog output
3 Plug-in power supply (optional)
Caution
Only connect probes to the instrument that cannot feed excessive voltages or currents (> SELV and > circuit with current limiter).
Almost all commercial electrodes - especially SCHOTT
electrodes - meet these requirements.
81
Overview
1.4 Declaration of Conformity
29.03.99
SCHOTT Geräte GmbH
Im Langgewann 5
D 65719 Hofheim am Taunus
Deutschland, Germany, Allemagne
29. März, March 29rd, 29, Mars, 1999
AGQSF0000-A059-00/990329
82
Ambient
temperature
1.5 Technical data
Storage temperature
- 25 °C ... + 65 °C
Overview
Measuring ranges
and resolution
Operating temperature
Allowable relative
humidity
[µS/cm]
[mS/cm]
0 °C ... + 55 °C
Annual mean: < 75 %
30 days/year: 95 %
Other days: 85 %
0.000 ... 1.999
-1
(only with 0.01 cm
cell constant )
0.00 ... 19.99
(only with 0.01 cm
-1
0.1 cm
cell constant )
-1
constant and
0.0 ... 199.9
0 ... 1999
0.00 ... 19.99
0.0 ... 199.9
0 ... 500
SAL 0.0 ... 70.0 according to the IOT
table
TDS [mg/l] 0 ... 1999
Factor can be set in the range
0.40 ... 1.00
T [°C] − 5.0 ... + 100.0
T [°F] + 23.0 ... + 212.0
83
Overview
Measuring accuracy
(± 1 digit)
Given as measuring uncertainty at a confidence level of
95%. All accuracies additionally depend on the accuracies
of the measuring probes.
No compensation:
Accuracy ± 0.5 %
Non-linear compensation :
Accuracy Test sample temperature
± 0.5 % 0 °C ... 35 °C
according to EN 27 888;
± 0.5 % 35 °C ... 50 °C
extended nLF function according to
SCHOTT measurements
Linear compensation :
Accuracy Test sample temperature
± 0.5 % 10 °C ... 75 °C
(the accuracy percentage always refers
to the measured value!)
SAL Range 0.0 ... 42.0
Accuracy Test sample temperature
± 0.1 at 5 °C ... 25 °C
± 0.2 at 25 °C ... 30 °C
TDS [mg/l] 1
T [°C] NTC 30:
Accuracy± 0.1
PT 1000:
Accuracy Operating temperature
± 0.5 0 °C ... 15 °C
± 0.1 15 °C ... 35 °C
± 1 35 °C ... 55 °C
84
Overview
Measuring accuracy
(± 1 digit)
(Continuation)
Cell constant,
to be set
Cell constant,
calibrated
Reference tempera-
ture, selectable
T [°F] NTC 30:
Accuracy ± 0.2
PT 1000:
Accuracy Operating temperature
± 0.9 at 32 °F ... 59 °F
± 0.2 at 59 °F ... 95 °F
± 1.8 at 95 °F ... 131 °F
C [cm
-1
] 0.01
0.1
0.250 ... 2.500
C [cm
-1
] 0.450 ... 0.500
0.800 ... 1.200
T
REF [°C] 20
25
Temperature input
Dimensions and
weight
Manual [°C] - 5 ... +100
Length [mm] 240
Width [mm] 285
Height [mm] 85
Weight [kg] Approx. 1.1
(without plug-in power supply unit)
85
Overview
Power supply
Batteries 4 x 1.5 V AA type alkaline manga-
nese batteries
Runtime Approx. 3000 operating hours
Mains power supply
(option)
Connection max. overvoltage cate-
gory II (valid for all plug-in power
supply units):
Plug-in power supply (Euro plug):
Type no.: Z850
Order no.: 28520 4889
FRIWO FW3288, 11.8134
Friwo Part No. 1816492
Input: 230V ~ / 50 Hz / 23 VA
Output: 6 V = / 1,8 A /10,8 VA
Plug-in power supply (US plug):
Type no.: Z852
Order no.: 28520 4901
FRIWO FW3288, 11.8451
Friwo Part No. 1816493
Input: 120V ~ / 60 Hz / 21,5 VA
Output: 6 V = / 1,8 A
86
Plug-in power supply (UK plug):
Type no.: Z851
Order no.: 28520 4897
FRIWO FW3288, 11.8453
Friwo Part No. 1770896
Input: 230V ~ / 50 Hz / 23 VA
Output: 6 V = / 1,8 A
EMC and
VDE norms
Interference emission (generic standard)
Overview
EN 50081-1
FCC class A
Interference immuni-
EN 50082-1
ty (generic standard)
Protective class 3, EN 61010-1
Climatic class 2, VDI/VDE 3540
Test marks TÜV GS, UL/CUL, CE
Display Multifunctional LCD
Keypad Foil keypad (Polyester)
Data storage Ring store for 200 value pairs, conductivity/salinity/TDS,
temperature
Temperature
compensation
Automatic with Pt
1000/NTC (30 k
W)
-5 ... 100,0 °C
Manual input -5 ... 100 °C resolution 1K
Connectors
Measuring cell 8 pole socket with pin contacts
RS interface/
analog output
Bidirectional RS 232 interface or
analog output with autom. recognition of the PC, printer, or recorder
connected
Plug-in power
2 pole special Friwo
supply (option)
87
Overview
88
Safety
2 Safety
This operating manual contains basic instructions that you
must follow during the commissioning, operation and maintenance of the instrument. Consequently, all responsible
personnel must read this operating manual before working
with the instrument.
The operating manual must always be available within the
vicinity of the instrument.
Target group This measuring instrument was developed for use in the lab-
oratory.
Thus, 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.
Symbols used
Caution
indicates instructions that have to be followed to prevent
damage to your instrument.
Warning
indicates instructions that have to be followed to protect
yourself and the instrument from dangerous electrical voltage.
Note
Indicates notes that draw your attention to special features.
Note
Indicates cross-references to other documents, e.g. application reports, operating manuals of measuring cells, etc.
89
Safety
2.1 Authorized use
This instrument is authorized exclusively for measuring the
conductivity, salinity, temperature and TDS (total dissolved
solids) in the laboratory.
The technical specifications as given in the section
ECHNICAL DATA, must be observed. Only the operation
1.5 T
and running of the measuring instrument according to the instructions given in this operating manual is authorized.
Any other use is considered unauthorized.
2.2 General safety instructions
This instrument is constructed and tested in compliance with
the EN 61010-1 safety regulations for electronic measuring
instruments.
It left the factory in a safe and secure technical condition.
Function and opera-
tional safety
The smooth functioning and operational safety of the instrument can only be guaranteed if the generally applicable
safety measures and the specific safety instructions in this
operating manual are followed.
The smooth functioning and operational safety of the instrument can only be guaranteed under the climatic conditions
specified in the section 1.5 T
ECHNICAL DATA.
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.
Caution
The instrument is only allowed to be opened by personnel
authorized by SCHOTT.
90
Safety
Safe operation If safe operation is no longer possible, the instrument must
be taken out of service and secured against inadvertent operation.
Safe operation is no longer possible if:
l the instrument has been damaged in transport
l the instrument has been stored under adverse conditions
for a lengthy period of time
l the instrument is visibly damaged
l the instrument no longer operates as described in this
manual
If you are in doubt contact the supplier of the instrument.
Obligations of the
operator
The operator of this measuring instrument must ensure that
the following laws and guidelines are observed when using
dangerous substances:
l EEC directives for protective labor legislation
l National protective labor legislation
l Safety regulations
l Safety datasheets of the chemical manufacturer.
91
Safety
92
Commissioning
3 Commissioning
Perform the following activities for initial comissioning:
l Set the date and time
l Connect the plug-in power supply (option).
Setting the date
and time
1 Press and hold down the <ì> key.
2 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.
3 Press the <run/enter> key repeatedly until the date
flashes on the display.
4 Set today’s date by pressing <
▲> <▼>.
5 Confirm with <run/enter>.
The date (month) flashes on the display.
6 Set the current month by pressing <
▲> <▼>.
7 Confirm with <run/enter>.
The year appears on the display.
8 Set the current year by pressing <
▲> <▼>.
9 Confirm with <run/enter>.
The hour field flashes on the display.
10 Set the current time by pressing <
▲> <▼>.
11 Confirm with <run/enter>.
The minutes field flashes on the display.
12 Set the current time by pressing <
▲> <▼>.
13 Confirm with <run/enter>. The measuring instrument
then switches to the measuring mode.
14 Switch off the instrument by pressing <on/off>.
93
Commissioning
Connecting the
plug-in power
supply (optional)
The measuring instrument works battery-powered. It can,
however, also be supplied by the plug-in power supply
which is available as an accessory.
Warning
The line voltage on site must lie within the input voltage
range of the original plug-in power supply unit (see section
ECHNICAL DATA).
1.5 T
Caution
Use original plug-in power supplies only (see section
1.5 T
ECHNICAL DATA).
2
3
1 Insert the plug (1) into the socket (2) of the conductiv-
ity meter
2 Connect the original SCHOTT plug-in power supply
(3) to an easily accessible mains socket.
Note
You can also perform measurements without a plug-in
power supply.
1
94
Operation
4Operation
4.1 Switch on the instrument
1 Place the instrument on a flat surface and protect it
against intense light and heat.
2 Connect the conductivity measuring cell to the instru-
ment.
3 Press the <on/off> key.
display test
The
The instrument then switches automatically to the
previously selected measuring mode.
4 Check or determine the cell constant [C]. The proce-
dure is described in section 4.3, on page 103.
appears briefly on the display.
Note
The instrument has an energy saving feature to avoid
unnecessary battery depletion.
The energy saving feature switches the instrument off if no
key has been pressed for an hour.
The energy saving feature is not active:
l if the power is supplied by the plug-in power supply
l if the
l if a PC is connected
l if the recorder cable is connected
l if the printer cable is connected
AutoStore
function is active
(for external printers)
95
Operation
Checking the cell
constant
1 Press the <CAL> key repeatedly until LF CELL is dis-
played.
2 Press the <run/enter> key.
The previously selected cell constant ist displayed,
e. g. 0.475 cm
-1
with a calibrated cell constant.
3 To return to the measuring mode: press the <ì> key
when the correct cell constant ist displayed.
4 If a different cell constant is to be set, proceed ac-
cording to section 4.3 D
CELL CONSTANT [C].
ETERMINING/SETTING UP THE
96
4.2 Measuring
Operation
Preparatory
activities
Temperature probe Measurements can be performed with and without a temper-
Perform the following activities when you want to measure:
1 Connect the measuring cell to the instrument.
2 Adjust the temperature of the test solutions or mea-
sure the current temperature if the measurement is
made without a temperature probe.
3 Calibrate the instrument with the measuring cell or
check the cell constant set up.
4 Select the measuring mode by pressing <
Caution
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.
ature probe. A connected temperature probe is indicated by
TP on the display.
If you want to use a SCHOTT conductivity measuring cell
without a temperature probe, you have to connect it with an
adapter (available at SCHOTT).
ì>.
Note
The conductivity meter automatically recognizes the type of
the temperature probe used. As a result, you can connect
electrodes with the NTC30 or Pt1000.
The temperature measurement is absolutely essential for a
reproducible conductivity measurement. If the measurement is made without a temperature probe, proceed as follows:
1 Determine the current temperature using a thermom-
eter.
2 Set up the temperature by pressing <
▲> <▼>.
97
Operation
AutoRead AR
(Drift control)
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.
1 Call up the measuring mode by pressing <ì>.
2 Activate the AutoRead function by pressing <auto
read>.
The current measured value is frozen (Hold function).
3 Start the AutoRead function by pressing
<run/enter>.
AR flashes on the display until a stable measured value is reached.
This measured value is transmitted to the interface.
4 If necessary, start the next AutoRead measurement
by pressing <run/enter>.
5 To terminate the AutoRead function: Press the
<auto read> key.
Note
The current AutoRead measurement (with acceptance of
the current value) can be terminated at any time by pressing
<run/enter>.
98
Operation
4.2.1 Conductivity
To measure the conductivity, proceed as follows:
1 Perform the preparatory activities according to sec-
tion 4.2.
2 Immerse the conductivity measuring cell into the test
sample.
3 Press the <ì> key until appears in the status dis-
play. The conductivity value appears on the display.
4 If necessary, set the temperature by pressing
<
▲><▼> (see section 4.2, page 97).
5 Perform an AutoRead measurement according to
section 4.2.
99
Operation
4.2.2 Salinity
To measure the salinity, proceed as follows:
1 Perform the preparatory activities according to sec-
tion 4.2.
2 Immerse the conductivity measuring cell into the test
sample.
3 Press the <ì> key repeatedly until Sal appears in the
status line. The salinity value of the sample appears
on the display.
4 If necessary, set the temperature by pressing
▲><▼> (see section 4.2, page 97).
<
5 Wait for a stable measured value.
100
6 Perform an AutoRead measurement according to
section 4.2.
Operation
4.2.3 TDS (total dissolved solids)
To measure the TDS, proceed as follows:
1 Perform the preparatory activities according to sec-
tion 4.2.
2 Immerse the conductivity measuring cell into the test
sample.
3 When measuring with an integrated temperature
probe continue with step 4.
When measuring without temperature probe:
– Determine the temperature of the test sample using
a thermometer
– Press the <
ì> key repeatedly until appears in
the status line
– Enter the temperature using <
4 Press the <
ì> key repeatedly until TDS appears in
▲> <▼>.
the status line. The TDS value of the sample appears
on the display.
5 Set up the TDS factor (0.40 ... 1.00) using <▲> <▼>.
6 Wait for a stable measured value.
101
Operation
7 Perform an AutoRead measurement according to
section 4.2.
4.2.4 Transmitting measured values
You can transmit measured values (data records) in 3 ways:
l Switch on the data transmission (Int 2) (see page 125)
– After expiry of the selected interval, the current data
record is sent to the interface.
l Switch on AutoStore (Int 1) (see page 116)
– After expiry of the selected interval, the current data
record is sent to the interface and in addition is stored
in the data store of the instrument
– AutoStore (Int 1) covers the
data transmission
interval
(Int 2).
l Press the <run/enter> key
This manually transmits the current measured values at
any time - independently of the selected intervals.
102
Note
If you connect a recorder (analog output), the output to the
digital output is switched off.
Operation
4.3 Determining/setting up the cell constant [C]
Why determine/set
up the cell
constant?
Determining the cell
constant
(calibration in
control standard)
Due to ageing, the cell constant slightly changes. As a
result, an inexact measured value is displayed. Calibration
determines the current value of the cell constant and stores
this value in the instrument.
Thus, you should calibrate at regular intervals.
You can determine the cell constant of the conductivity mea-
-1
suring cell in the range 0.450 ... 0.500 cm
1,200 cm
-1
by calibrating in the control standard or set it up
manually in the range 0.250... 2.500 cm
can select one of the fixed cell constants 0.1 cm
0.01 cm
-1
.
or 0,800 ...
-1
. Additionally, you
-1
or
Determine the cell constant as follows:
1 Press the <CAL> key repeatedly until LF CELL ap-
pears on the display.
2 Press the <run/enter> key repeatedly to go to the
"Determining/ setting up the cell constant" function.
3 Press the <CAL> key repeatedly until the following is
displayed.
103
Operation
4 Immerse the measuring cell into the 0.01 mol/l KCL
control standard.
5 Press the <run/enter> key.
– If no temperature probe is connected, enter the
current temperature of the solution using <
▲> <▼>
and confirm with <run/enter>
– If a temperature probe is connected, the AR
measurement to determine the cell constant starts.
flashes until a stable signal is achieved. The
determined cell constant ist displayed; the
measuring instrument automatically stores the cell
constant.
Note
If error message appears see chapter 6 W
HAT TO DO IF...
104
AutoRead During calibrating, the
activated. The AR display flashes. The calibration procedure
is finished when the AR display stops flashing.
AutoRead
function is automatically
Operation
Note
This method of automatically determining the cell constant
by calibrating in the 0.01 mol/l KCL control standard can
only be used for measuring cells with a cell constant in the
-1
range 0.450 ... 0.500 cm
or 0.800 ... 1.200 cm-1.
Calibration
evaluation
After calibrating, the instrument automatically evaluates the
current condition of the calibration.
The evaluation appears on the display.
Display Cell constant [cm-1]
0.450 ... 0.500 cm
0.800 ... 1.200 cm
-1
-1
outside of the ranges
0.450 ... 0.500 cm
-1
or
Perform error elimination
0.800 ... 1.200 cm
-1
according to chapter
6W
HAT TO DO IF...
Calibration protocol The calibration protocol contains the cal ibr ati on dat a of the
current calibration.
Note
You can automatically print out a calibration protocol after
the calibration. To do so, connect a printer to the interface
according to section 4.5.3 before calibrating. After a valid
calibration, the protocol is printed.
CALIBRATION PROTOCOL
14.04.99 11:37
Device No.: 99990000
CALIBRATION CONDUCTIVITY
Cal Time: 14.04.99 / 11:37
Cal Interval: 180d
Cal Std.: 0.01 mol/l KCL
40.0 °C
Conduct./Tref25: 1413µS/cm
Cell Const : 0.975 1/cm
Probe : +++
105
Operation
Calibration interval
(Int 3)
Setting the
calibration interval
The flashing sensor symbol reminds you to calibrate regularly. After the selected calibration interval (Int 3) expires,
the sensor symbol flashes. Measurements can continue.
Note
To ensure the high measuring precision of the measuring
system, perform a calibration after the calibration interval
expires.
The calibration interval (Int 3) is set to 180 days in the factory. The interval can be changed (1 ... 999 days):
1 Switch off the instrument.
2 Press <
3 Press the <on/off> key.
The
The instrument then switches automatically to the
configuration level.
ì> and hold down the key.
display test
appears briefly on the display.
4 Press the <run/enter> key until Int 3 appears on the
display.
5 Press <▲> <▼> to set the required time interval until
the next calibration.
6 Confirm with <run/enter>.
7 Change to the measuring mode by pressing <ì>.
106
Operation
Setting up the cell
constant manually
To set up the cell constant manually, proceed as follows:
1 Press the <CAL> key repeatedly until LF CELL ap-
pears on the display.
2 Press the <run/enter> key.
3 Press the <CAL> key repeatedly until the cell con-
-1
stant to be set, e. g. 0.475 cm
is displayed.
4 Set up the cell constant to be used by pressing
▲><▼>, e. g. 0.614 cm
<
-1
.
5 To return to the measuring mode: press the <ì> key.
Note
107
Operation
The cell constant to be set up must either be taken from the
operating manual of the measuring cell or is printed on the
measuring cell.
Selecting the
0.1 cm
-1
cell constant
To select the 0.1 cm
-1
cell constant proceed as follows:
1 Press the <CAL> key repeatedly until LF CELL ap-
pears on the display.
2 Press the <run/enter> key.
3 Press the <CAL> key repeatedly until the 0.100 cm
cell constant appears on the display.
-1
108
4 To return to the measuring mode: press the <ì> key.
Operation
Selecting the
0.01 cm
-1
cell constant
To select the 0.01 cm
-1
cell constant proceed as follows:
1 Press the <CAL> key repeatedly until LF CELL ap-
pears on the display.
2 Press the run/enter> key.
3 Press the <CAL> key repeatedly until the 0.010 cm
cell constant appears on the display.
-1
4 To return to the measuring mode: press the <ì> key.
109
Operation
Setting up the
temperature
compensation TC
ips Select the following temperature compensations to work
The calculation of the temperature compensation is based
on the preset reference temperature, Tref 20 or Tref 25 (see
section 4.6 C
ONFIGURATION).
You can select one of the following temperature compensations:
l Non-linear temperature compensation "nLF"
according to DIN 38404 or EN 27 888
l linear temperature compensation "Lin" with a
coefficient that can be set in the range 0.001 ... 3.000 %/K
l no temperature compensation
Note
with the test samples given in the table:
Application
notes
Test sample Temperature
compensation TC
Natural water
(ground water,
surface water,
nLF
according to DIN 38404
EN 27 888
drinking water)
Ultrapure water nLF
according to DIN 38404
EN 27 888
Other aqueous
solutions
Set linear
temperature coefficient
0.001 ... 3.000 %/K
Salinity
(seawater)
Automatically nLF according to IOT
Display
indicator
Sal,
110
Operation
Selecting the non-
linear temperature
compensation
To select the non-linear temperature compensation proceed
as follows:
1 Press the <CAL> key repeatedly until LF tc appears
on the display.
2 Press the <run/enter> key.
3 Press the <CAL> key repeatedly until nLF appears
on the display.
4 To return to the measuring mode: press the <ì> key.
111
Operation
Selecting the linear
temperature
compensation
To select the linear temperature compensation proceed as
follows:
1 Press the <CAL> key repeatedly until LF tc appears
on the display.
2 Press the <run/enter> key.
3 Press the <CAL> key repeatedly until the adjustable
linear temperature coefficient appears on the display.
112
4 Set up the temperature coefficient, e. g. 1.880 %/K
using <
▲> <▼>.
5 To return to the measuring mode: press the <ì> key.
Operation
Switching off the
temperature
compensation
To switch off the temperature compensation proceed as follows:
1 Press the <CAL> key repeatedly until LF tc appears
on the display.
2 Press the <run/enter> key.
3 Press the <CAL> key repeatedly until the following
display appears.
4 The temperature compensation has been switched
off.
5 To return to the measuring mode: press the <
ì> key.
113
Operation
4.4 Storing
The conductivity meter has an internal data storage device.
Up to 200 data records can be stored in it.
A complete data record consists of:
l Memory location
l Date
l Time
l Measured value
l Temperature
l I.D. number
You can transmit measured values (data records) to the
data storage in 2 ways:
l Manual storage
l Switching on the AutoStore function (Int 1), see page 116.
4.4.1 Manual storage
You can transmit a measured value to the data storage as
follows:
1 Press the <STO> key.
The current number of the next free memory location
appears on the display.
114
Operation
2 Confirm with <run/enter>.
The display changes to the input of the I.D. number.
3 Enter the required I.D. number (1 ... 999) by pressing
▲> <▼>.
<
4 Confirm with <run/enter>.
The instrument changes to the measuring mode.
*(+,, message This message appears if all 200 memory locations are full.
You have the following options:
Store the current measured value.
The oldest measured value (memory
Press
<run/enter>
location 1) is overwritten by this
Return to the measuring mode without
Press any key
storing
Output the data storage See section 4.4.3
Delete the data storage See section 4.4.4
115
Operation
4.4.2 Switching on AutoStore (Int 1)
The storage interval (Int 1) determines the time interval
between automatic storage processes.
After the time interval expires, the current data record is
transmitted to the data storage and to the interface.
The storage interval (Int 1) is set to OFF in the factory.
Thus, the
AutoStore
function is switched off.
To switch the function on, set up a time interval (5 s, 10 s,
30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min).
Note
If the
AutoStore
function is active, the setting of the data
transmission interval (int 2) is ineffective (see page 125).
Setting the storage
interval
1 Press and hold down the <run/enter> key.
2 Press the <STO> key. Int 1 appears on the display.
3 Press the <▲> <▼> keys to set up the required time in-
terval between storage processes.
4 Confirm with <run/enter>.
The number of free memory locations appears on the
display.
116
Operation
5 As soon as all 200 memory locations are full, the Au-
toStore function is terminated (Int 1 = OFF).
If too few storage locations are available for your
measurements:
– backup the data storage (see page 118) and
– clear the data stored (see page 124).
6 Confirm with <run/enter>.
The prompt for the I.D. number appears on the display.
7 Press <▲> <▼> to set the required I.D. number.
8 Confirm with <run/enter>.
The instrument changes to the measuring mode and
starts the measuring and storage procedure.
AutoStore
flashes on the display.
117
Operation
Note
The
AutoStore
function is interrupted if you perform other
functions, e.g. output data storage.
After completing the other function, the
AutoStore
function
continues. However, as a result, gaps can occur in the
recording of the measured values.
Switching off the
AutoStore
Outputting to the
display
Switch off the
l Setting the storage interval (Int 1) to OFF or
l Switch the conductivity meter off and on again.
AutoStore
function by:
4.4.3 Outputting the data storage
The contents of the data storage can be output to the:
l display
l interface
1 Press the <RCL> key repeatedly until
Sto disp
ap-
pears on the display.
118
2 Press the <run/enter> key.
A measured value appears on the display.
The I. D. number of the data record appears for approx. 2 s.
Operation
3 After 2 s the respective temperature of the data
record appears on the display. Stored data records
are displayed together with the RCL display indicator.
You can perform the following activities:
Display further parameters of the data
record (I.D. no., date, time, memory location)
Advance one data record (memory location)
Go back one data record (memory location)
Press
<run/enter>
Press <
Press <
▲>
▼>
119
Operation
Note
If you want to find a specific parameter (e.g. date), proceed
as follows:
1 Press the <RCL> key repeatedly until
Sto disp
ap-
pears on the display.
2 Press the <run/enter> key.
A measured value appears on the display.
The I. D. number of the data record appears for approx. 2 s.
3 After 2 s the respective temperature of the data
record appears on the display.
120
4 Select the parameter (e.g. date) by pressing
<run/enter>.
5 Press <
▲> or <▼> repeatedly until the required date
appears on the display.
After approx. 2 s, the temperature of the displayed
measured value appears.
Operation
Outputting to the
interface
1 Press the <RCL> key repeatedly until
pears on the display.
2 Press the <run/enter> key.
The protocol of the last calibration is transmitted to
the RS interface. In the meantime,
on the display.
Following the calibration protocol, the complete contents of the storage is transmitted to the interface.
Sto SEr
Sto CAL
appears
ap-
Note
You can cancel the transmission by pressing <
<run/enter>.
ì> or
121
Operation
Sample printout
CALIBRATION PROTOCOL
14.04.99 11:37
Device No.: 99990000
CALIBRATION CONDUCTIVITY
Cal Time: 14.04.99 / 11:37
Cal Interval: 180d
Cal Std.: 0.01 mol/l KCL
23.0 °C
Conduct./Tref25: 1413 µS/cm
Cell Const : 0.975 1/cm
Probe: +++
No. 1:
01.01.99 00:04
2.40 mS/cm 25 °C
Tman
nLF
Tref25 C = 0.475 1/cm
Ident : 1
No. 2:
10.01.99 10:09
2.40 mS/cm 25.3 °C
Tauto
nLF
Tref25 C = 0.475 1/cm
Ident : 1
No. 3:
12.01.99 01:48
2.40 mS/cm 21.6 °C
Tauto
nLF
Tref25 C = 0.475 1/cm
Ident : 1
The printout
contains:
l Calibration protocol:
– Date/time of the printout
– Instrument number (Device No.)
– Date/time of the calibration (Cal Time)
– Calibration interval (Cal Interval)
– Calibration standard 0.01 mol/l KCL (Cal Std.) [°C/F]
– Conductivity of the calibration standard at 25 °C
(Conduct./Tref25)
– Cell constant (Cell Const)
– Probe evaluation (Probe)
122
l Contents of the measuring storage:
– Number of the storage location (No.)
– Date/time of measurement
– Measured value/unit (mS/cm) [°C/F]
– Automatic/manual temperature measurement
(Tauto/Tman)
– Temperature compensation (nLF)
– Tref
– Cell constant (1/cm)
– AutoRead function (AR)
– I.D. number (Ident)
Operation
123
Operation
4.4.4 Clearing the storage
This function can erase the stored data records. 200 memory locations will then become available again.
Note
Clear store
The
function only appears if data records have
already been stored in the storage. Otherwise, the conductivity meter automatically changes to the measuring mode.
In order to delete all the data records, proceed as follows:
1 Switch off the instrument.
2 Press and hold down the <STO> key.
3 Press the <on/off> key.
The
display test
appears briefly on the display.
124
4 Confirm the clearing process by pressing
<run/enter>.
Pressing any other key stops the clearing process
and the data records remain in the storage.
Note
The calibration data remain in the storage and can be called
up via the calibration protocol.
4.5 Data transmission
You can use the following options to transmit data:
l One of the following options:
Operation
– The
AutoStore
periodically (
function (page 116) is used to
Int 1
storage interval) save measured
values internally and output them on the interface.
– The
data transmission interval (Int 2)
function is used to
periodically output measured values to the interface
(see below).
l The
Output data store
function (page 118) is used to output calibration data and stored measured values to the interface.
l The analog recorder output (page 127) is used to output
measured values as voltages.
4.5.1 Data transmission interval (Int 2)
The interval for the data transmission (Int 2) determines the
time interval between automatic data transmissions. After
the time interval expires, the current data record is transmitted to the RS interface.
Note
The setting of the interval (Int 2) only has an effect when the
storage interval (
AutoStore
function) is switched off.
125
Operation
Setting the
data transmission
interval
The interval is set to OFF in the factory.
To start the data transmission, set up an interval (5 s, 10 s,
30 s, 1 min, 5 min, 10 min, 15 min, 30 min, 60 min):
1 Press and hold down the <run/enter> key.
2 Press the <auto read> key.
Int 2 appears on the display.
3 Press <▲> <▼> to set up the required time interval be-
tween storage processes.
4 Confirm with <run/enter>.
The instrument changes automatically to the measuring mode.
Note
If the
AutoStore
function is active, the data transmission is
performed according to the setting of the storage interval
(Int1). Set the storage interval (Int1) to OFF to activate the
data transmission
interval (Int2).
Note
You can also set the
Configuration
menu (see page 125).
data transmission
interval (Int2) in the
126
Operation
/
4.5.2 Recorder (analog output)
You can transmit the data to a recorder via the analog output. Connect the analog output to the recorder via the Z394
interface cable.
The data output switches automatically to
recorder output
.
Socket assignment
Conductivity
resistance
1 Free
2 Plug coding
3 Ground
4 Analog output
(Internal resistance < 5 Ohm)
Note
Activate the analog output by connecting 2 and 3 or use the
original cable.
The signal range of the analog output depends on the measured parameter and the measuring range:
Measuring range Voltage Resolution
0.000 ... 1.999 µS/cm 0 ... 1999 mV 1 mV
0.00 ... 19.99 µS/cm 0 ... 1999 mV 1 mV
0.0 ... 199.9 µS/cm 0 ... 1999 mV 1 mV
Salinity
TDS
0 ... 1999 µS/cm 0 ... 1999 mV 1 mV
0.00 ... 19.99 mS/cm 0 ... 1999 mV 1 mV
0.0 ... 199.9 mS/cm 0 ... 1999 mV 1 mV
0 ... 500 mS/cm 0 ... 500 mV 1 mV
Measuring range Voltage Resolution
0 ... 70.0 0 ... 700 mV 1 mV
Measuring range Voltage Resolution
0 ... 1999 mg/l 0 ... 1999 mV 1 mV
127
Operation
4.5.3 PC/external printer (RS232 interface)
You can transmit data to a PC or an external printer via the
RS232 interface.
Connect the interface to the instrument via the Z395 cable
(PC) or Z391 cable (external printer).
The data output switches automatically to
RS232
.
Note
The RS232 interface is not galvanically isolated.
If it is connected to an earthed PC/printer, measurements
cannot be made in earthed media as this would give incorrect results!
Set up the following transmission data on the PC/printer:
Socket assignment
Baud rate Selectable between:
1200, 2400, 4800, 9600
Handshake RTS/CTS + Xon/Xoff
PC only:
Parity None
Data bits 8
Stop bits 1
1 CTS
2 RxD
3 Ground
4 TxD
128
Operation
4.6 Configuration
You can adapt the conductivity meter to your individual
requirements. To do this, the following parameters can be
called up/changed (the status on delivery is marked in bold):
Baud rate 1200, 2400, 4800, 9600
Data transmission inter-
val (Int 2)
Calibration interval (Int 3) 1 ... 180 ... 999 d
AutoRange ARng yes, no
TREF 25/TREF 20
Measured values given
as conductivity or resistance values
Temperature unit °C or °F
Date/time as required
Note
You can leave the configuration menu at any time. Parameters that have already been changed are stored.
To do this, press the <
OFF, 5 s, 10 s, 30 s,
1 min, 5 min, 10 min,
15 min, 30 min, 60 min
* or *
S/cm or M
Ω
ì> key.
1 Switch off the instrument.
2 Press and hold down the <
3 Press the <on/off> key.
The display test
The instrument then switches automatically to the
setting of the baud rate.
appears briefly on the display.
ì> key.
129
Operation
Baud rate
4 Set up the required baud rate by pressing <▲> <▼>.
5 Confirm with <run/enter>.
Int 2 appears on the display.
Data transmission
interval
Calibration
interval
6 Set up the required time interval by pressing
▲><▼>.
<
7 Confirm with <run/enter>.
Int 3 appears on the display.
130
ARng (AutoRange)
8 Set up the required time interval by pressing
▲><▼>.
<
9 Confirm with <run/enter>.
ARng appears on the display.
Operation
Reference
temperature
10 With <▲> <▼> select between YES and no.
11 Confirm with <run/enter>. t25 appears on the dis-
play.
12 With <▲> <▼> select between t25 and t20 .
13 Confirm with <run/enter>.
LF appears on the display.
131
Operation
Conductivity
Temperature unit
14 With <▲> <▼> select between S/cm and MΩ.
15 Confirm with <run/enter>.
USE °C appears on the display.
132
16 Select between °C and °F by pressing <▲> <▼>.
17 Confirm with <run/enter>.
The date flashes on the display.
Date and time
18 Set today’s date by pressing <▲> <▼>.
19 Confirm with <run/enter>.
The date (month) flashes on the display.
20 Set the current month by pressing <▲> <▼>.
21 Confirm with <run/enter>.
The year appears on the display.
Operation
22 Set the current year by pressing <▲> <▼>.
23 Confirm with <run/enter>.
The hours flash on the display.
24 Set the current time by pressing <▲> <▼>.
25 Confirm with <run/enter>.
The minutes flash on the display.
26 Set the current time by pressing <▲> <▼>.
27 Confirm with <run/enter>.
The instrument changes automatically to the conduc-
tivity measuring mode.
133
Operation
4.7 Reset
You can reset (initialize) measuring and configuration
parameters separately from one another.
Measuring
parameters
The following measuring parameters (Cond InI) are reset to
the values they had on delivery:
Measuring mode
-1
Cell constant 0.475 cm
0.475 cm
Temperature
nLF
(calibrated)
-1
(set up)
compensation
Reference temperature
Temperature coefficient of
2.000 %/K
the linear temperature
compensation
TDS factor 1.00
Note
When the measuring parameters are reset, the calibration
data are lost. After the parameters have been reset, calibrate!
134
Configuration
parameters
The following configuration parameters (InI) are reset to the
values they had on delivery:
Baud rate 4800
Interval 1
(automatic storing) OFF
Interval 2
(for data transmission) OFF
Resetting
measuring
parameters
Operation
1 Press and hold down the <run/enter> key.
2 Press the <CAL> key.
3 Use <▲> <▼> to toggle between no and yes.
yes: reset measuring parameters.
no: retain settings.
Resetting
configuration
parameters
4 Confirm with <run/enter>.
The instrument changes to the configuration
parameters.
5 Toggle between no and yes by pressing <▲> <▼>.
yes: reset configuration parameters.
no: retain settings.
6 Confirm with <run/enter>.
The instrument changes automatically to the conductivity measuring mode.
135
Operation
136
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.
Note
See the relevant operating manual of the electrode for instructions on maintenance.
1 Open the battery compartment (1) on the underside
of the instrument.
2 Remove the four batteries from the battery compart-
ment.
3 Insert four new batteries (Type Mignon AA) into the
battery compartment.
4 Close the battery compartment (1).
The date (day) flashes on the display.
5 Set up the date and time according to chapter 3 COM-
MISSIONING.
1
Caution
Make sure that the poles of the batteries are the right way
round. The
spond to the
± signs in the battery compartment must corre-
± signs on the batteries.
Only use leakproof alkaline manganese batteries.
137
Maintenance, cleaning, disposal
5.2 Cleaning
Occasionally wipe the outside of the measuring instrument
with a damp, lint-free cloth. Disinfect the housing with isopropanol as required.
Caution
The housing is made of synthetic material (ABS). Thus,
avoid contact with acetone or similar detergents that contain
solvents. Remove any splashes immediately.
5.3 Disposal
Packing The measuring instrument is sent out in a protective trans-
port packing.
We recommend: Keep the packing material. It protects the
instrument against damage during transport.
Batteries This note refers to the battery regulation that applies in the
Federal Republic of Germany. We would ask end-consumers in other countries to follow their local statutory provisions.
Note
In compliance with §14 of the B
ATTERY REGULATION, we
would like to point out that 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 appropriate collection point. It is illegal to dispose of them
in household refuse.
138
Error message,
What to do if...
6 What to do if...
Cause Remedy
I/
Error message,
LoBat
Instrument does not
react to keystroke
– Measuring cell not
connected
– Connect measuring
cell
– Cable broken – Replace electrode
Cause Remedy
– Measuring cell
contaminated
– Unsuitable calibration
solution
– Clean measuring cell;
if necessary, replace it
– Check calibration
solutions
Cause Remedy
– Batteries almost
depleted
– Replace batteries
(see section 5.1
M
AINTENANCE)
Cause Remedy
– Operating state
undefined or EMC
electric stress unallowed
– Processor reset:
Press the <auto read>
key and switch on
instrument
*(
display
Cause Remedy
– Timeout of the interface – Check connected
instrument
139
What to do if...
message
*(+,,
Cause Remedy
– All 200 memory
locations are full
– Output data storage and
clear data storage
(see page 124)
140
Lists
7Lists
This chapter provides additional information and orientation
aids.
Abbreviations The list of abbreviations explains abbreviations that appear
on the display or when dealing with the instrument.
Specialist terms The glossary briefly explains the meaning of the specialist
terms. However, terms that should already be familiar to the
target group are not described here.
Index The index helps you find the topics that you are looking for.
141
Lists
Abkürzungsverzeichnis
Conductivity value
ABS Plastic housing
AR AutoRead (drift control)
ARng Automatic range switching
Measuring instrument measures with high-
est resolution
AutoStore Automatic storing
Baud Baud rate
C Cell constant cm
-1
Cal Calibration
CELL Cell constant
disp Display
Output of the data storage on the display
E3 Error message (see chapter 6 W
IF...)
Ident I. D. number
InI Initialization
Resets individual basic functions to
the status they had on delivery
Int Interval
Lin Linear temperature compensation
LoBat Low Battery
Batteries are almost empty
HAT TO DO
142
nLF Non-linear temperature compensation
OFL Overflow
Display range exceeded
Sal Salinity
SELV Safety Extra Low Voltage
Sto CIr Clear storage
Sto disp Output of the data storage on the display
Sto Full Memory full
Sto SEr Output of the data storage to the printer/
interface
Tauto Automatic temperature measurement
TC Temperature coefficient
TDS Total dissolved solids
TP Temperature Probe
Temperature measurement active
Tref 20/T20 Reference temperature 20 °C
Lists
Tref 25/T25 Reference temperature 25 °C
°C Temperature unit °Celsius
°F Temperature unit Fahrenheit
143
Lists
Glossary
AutoRead Monitors the electrode drift and releases the measured val-
ue only after the stability criterion has been reached. In this
way, this procedure ensures the highest degree of precision
and reproducibility.
Calibration The cell constant is determined through calibration. To do
so, the conductivity measuring cell is immersed into a series
of aqueous salt solutions with exactly known electric conductiviy. The relevant conductivity values are determined
using the conductivity measuring instrument.
Cell constant Linear factor describing the geometrical dimensions of a
measuring cell and its electrodes.
l With the value of the cell constant you can roughly de-
scribe the application range of a conductivity measuring
cell.
l The cell constant is determined through calibration in one
or several calibration solutions.
Conductivity The conductivity value is a sum parameter for the ion con-
centration of a test sample.
Control standard
solution
Solution with a known conductivity to determine or check the
conductivity.
Drift control See AUTOREAD.
144
Reference
temperature
In order to compare values measured at different temperatures, the values have to be converted to a fixed tempera-
ture. This temperature is 25 °C, or, as an exception, 20 °C.
Lists
Resistance All substances (solids, liquids, or gases) with mobile charge
carriers like for example electrons or ions have a finite ohmic
resistance, which means they have an electric conductance
that can be measured or an electric conducitivtiy.
Salinity The salinity is a sum parameter especially for seawater;
it gives the salt content of seawater.
Temperature
compensation (TC)
Test sample The substance to be measured. It can be liquid or solid.
Total dissolved
solids (TDS)
The temperature has a very strong impact on the electrical
conductivity. To be able to compare measured values, it is
necessary to temper or convert the test sample to a reference temperature.
Mass that remains of the substances dissolved in an aqueous solution after a fixed filtering and drying procedure, as
far as these substances are not volatile under the conditions
of this procedure. The total dissolved solids refer to the volume of the filtered aqueous sample used und are given in
mg/l.
145
Lists
146
Index
Lists
A
analog output 127
authorized use 90
AutoRange 131
AutoRead 98
AutoStore 116
B
batteries, replacing 137
battery compartment 137
baud rate, setting 130
C
calibration 103
interval 106
protocol 105
calibration evaluation 105
cell constant 96, 103
cleaning 138
commissioning 93
condition on delivery 134
conductivity 132
conductivity measurement 99
conductivity/resistance 127
I
initialize 134
interval
calibration (Int 3)
storing (Int 1) 116
106
K
keys 80
L
linear temperature compensation 110,
112
LoBat 139
M
maintenance 137
manual storing 114
measuring 97
measuring precision 106
N
no temperature compensation 110
non-linear temperature compensation
110, 111
D
data record 114
data transmission (interval) 126
date, setting 132
display 81
disposal 138
drift control 98
E
energy saving feature 95
error messages 139
O
operation 95
operational safety 90
output data storage 118
P
place of the instrument 95
plug-in power supply 94
power supply 94
printing
calibration protocol
measured values 102
105
147
Lists
R
recorder output 127
reference temperature 131
replacing the batteries 137
reset 134
RS232 interface 128
S
safety 89
safety precautions 89
salinity 127
salinity measurement 100
sockets 81
storing 114
T
TDS 127
TDS (total dissolved solids) 101
temperature compensation 110
linear 112
non-linear 111
setting 110
switch off 113
temperature probe 97
temperature unit 132
time
setting
time, setting 132
total dissolved solids measurement 101
transmit data 125
transmitting measured values 102
93
W
What to do if... 139
148
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