wtw Cond 1970i User manual

ba75692e02 07/2009
Cond 1970i
Operating manual
cm
S/
5
2 5 0
30
°
C
nLF
ARng
Tref25
TP
REL1
RUN / ENTER
AUTO READ
CAL
STO
M
RCL
ON / OFF
Cond 1970i
Portable conductivity measuring instrument

Cond 1970i
2ba75692e02 07/2009
Accuracy when
going to press
The use of advanced technology and the high quality standard of our
instruments are the result of a continuous development. This may re-
sult 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 ac-
cept any legal claims resulting from the data, figures or descriptions.
Copyright ©Weilheim 2009, WTW GmbH
Reproduction in whole - or even in part - is prohibited without the ex-
press written permission of WTW GmbH, Weilheim.
Printed in Germany.

Cond 1970i Contents
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Cond 1970i - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Socket field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 10
3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.4 Sensor quiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Switching on the measuring instrument . . . . . . . . . . . . . 15
4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . 16
4.2.2 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.3 Salinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.4 TDS (Total dissolved solids) . . . . . . . . . . . . . . . 19
4.2.5 AutoRead AR (drift control) and hold function . . 20
4.3 Determining/setting up the cell constant [C] . . . . . . . . . . 21
4.3.1 Determining the cell constant (calibrating) . . . . 23
4.3.2 Setting the cell constant manually . . . . . . . . . . . 25
4.4 Setting the temperature compensation TC . . . . . . . . . . 28
4.4.1 Selecting the nonlinear temperature compensation
29
4.4.2 Selecting the linear temperature compensation 30
4.4.3 Switching the temperature compensation off . . 31
4.5 Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.5.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 32
4.5.2 Saving automatically . . . . . . . . . . . . . . . . . . . . . 34
4.5.3 Outputting the data storage . . . . . . . . . . . . . . . . 36
4.5.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 40
4.6 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.6.1 Data transmission interval (Int 2) . . . . . . . . . . . 41
4.6.2 Recorder (analog output) . . . . . . . . . . . . . . . . . 43

Contents Cond 1970i
4ba75692e02 07/2009
4.6.3 PC/external printer (RS232 interface) . . . . . . . . 45
4.6.4 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.7 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
4.8 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 51
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.2 Measuring ranges, resolutions, accuracies . . . . . . . . . . 58
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Cond 1970i Overview
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1Overview
The portable Cond 1970i measuring instrument enables you to carry
out conductivity measurements rapidly and reliably.
The Cond 1970i provides the maximum degree of operating comfort,
reliability and measuring certainty for all applications.
The proven procedures to determine or set up the cell constant support
you in your work with the measuring instrument. The special AutoRead
function enables precise measurements.
1Keypad
2Display
3Integrated, exchangeable sensor quiver
4Socket field
5Carrying and positioning handle
cm
S/
5
2 5 0
30
°
C
nLF
ARng
Tref25
TP
REL1
RUN / ENTERRUN / ENTER
AUTO READ
CAL
STO
M
RCL
ON / OFF
Cond 1970i
1
23
4
5

Overview Cond 1970i
6ba75692e02 07/2009
Note
If you need further information or application notes, you can obtain the
following material from WTW:
zApplication reports
zPrimers
zSafety datasheets.
You will find information on available literature in the WTW catalog or
via the Internet.
1.1 Display
Sal
pH/mV
%
pH
S
O
Oxi TEC
REL2REL1
mcm
S/
cm
1/
Sal
8
8888
88
1
°
C
Time
Year
LoBat nLF Cal ARng AR RCL
Ident
Tref25 Tref20 Auto Store
TP
No. Day.Month
Baud
K
/
%
mg/l
Lin
Status display indicator
Measured value
Function and
Temperature display
Sensor symbol
display

Cond 1970i Overview
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1.2 Keypad
Key functions Switch measuring instrument on/off
<ON/OFF>
Select the measuring mode <M>:
– Conductivity
– Salinity
– Total dissolved solids (TDS)
– Determine or set up the cell constant
– Select temperature compensation
<CAL>
Activate/deactivate the AutoRead function
<AUTO READ>
Confirm entries, start AutoRead,
output measured values
<RUN/ENTER>
Select the measuring mode, increase values,
scroll
<▲>
Select the measuring mode, decrease values,
scroll
<▼>
Display/transmit measured values
<RCL>
Save a measured value
<STO>
ON / OFF
M
CAL
AUTO READ
RUN / ENTER
RCLRCL
STOSTO

Overview Cond 1970i
8ba75692e02 07/2009
1.3 Socket field
Sensors You can use the following sensors with the Cond 1970i:
zConductivity depth armature
zConductivity measuring cell
zOption: External temperature sensor
Connectors
Warning
Only connect conductivity measuring cells to the measuring instrument
that cannot return any voltages or currents that are not allowed (>
SELV and > current circuit with current limiting). Nearly all measuring
cells - especially WTW measuring cells - fulfill these conditions.
Sensor / Instrument Socket
Conductivity measuring cell or depth armature 1
Temperature sensor, external 2and 3
Printer or PC (serial interface, RS232) 4
Plug-in power supply unit 5
Watertight valve for internal pressure equalization 6
2
3
1
4
5
6

Cond 1970i Safety
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2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the conduc-
tivity 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 vi-
cinity 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 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 safety instructions
such as the label shown below to indicate various hazards or dangers:
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 of the measuring instrument consists exclusively of
the measurement of conductivity, salinity, temperature and TDS (total
dissolved solids) 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 instru-
ment according to the instructions given in this operating manual is au-
thorized.
Any other use is considered to be unauthorized.

Safety Cond 1970i
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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 7 TECHNICAL DATA.
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 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 the measuring instrument:
zhas been damaged in transport
zhas been stored under adverse conditions for a lengthy period of
time
zis visibly damaged
zno longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the instrument.
Obligations
of the purchaser
The purchaser of the measuring instrument must ensure that the fol-
lowing laws and guidelines are observed when using dangerous sub-
stances:
zEEC directives for protective labor legislation
zNational protective labor legislation
zSafety regulations
zSafety datasheets of the chemical manufacturers.

Cond 1970i Commissioning
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3 Commissioning
3.1 Scope of delivery
zPortable measuring instrument, Cond 1970i with integrated re-
chargeable battery
zCarrying and positioning handle
zCarrying strap
zSensor quiver
zPlug-in power supply unit
zOperating manual
3.2 Power supply
Mains operation and
charging the battery
You can either operate the measuring instrument with the integrated re-
chargeable battery or with the plug-in power supply. The plug-in power
supply supplies the measuring instrument with low voltage (12 V DC).
At the same time, the rechargeable battery is charged.
Charging time of the
battery
approx. 16 hours. The battery is charged even when the instrument is
switched off. The LoBat display indicator appears when the battery is
nearly empty and has to be charged as soon as possible.
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 TECHNICAL DA-
TA).
Warning
Use original plug-in power supplies only (see
chapter 7 TECHNICAL DATA).

Commissioning Cond 1970i
12 ba75692e02 07/2009
Connecting the plug-in
power supply unit
3.3 Initial commissioning
Perform the following activities:
zFor mains operation and charging the battery: Connect the plug-in
power supply (see section 3.2 POWER SUPPLY).
zSet the date and time.
Setting the date and
time
1Connect the plug (1) to the socket (2) of the measuring instru-
ment.
2 Connect the original WTW plug-in power supply (3) to an easily
accessible mains socket.
2
1
3
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 flashes
on the display (Day.Month display indicator).

Cond 1970i Commissioning
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ba75692e02 07/2009
4Set the date of the current day with <▲> <▼>.
5 Confirm with <RUN/ENTER>.
The date (month) flashes in the display.
6Set the current month with <▲> <▼>.
7 Confirm with <RUN/ENTER>.
The year appears on the display.
8Set 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 Confirm with <RUN/ENTER>.
The instrument switches to the measuring mode.
REL1 Tref25
5t2
Time
Cal
I
O
AR
cm
1/
TP
ARng nLF
°
C
cm
S/
Sal
RCL
%
S
%
m
mg/l
Oxi
Year Ident
No.
Tref20
LoBat Lin
Sal
pH
TEC
Auto Store
Baud
K
/
REL2
pH/mV
Day.Month
0904

Commissioning Cond 1970i
14 ba75692e02 07/2009
3.4 Sensor quiver
To store the sensors during field operation and to keep the sensor ele-
ment moist, the quiver tip contains a sponge rubber insert that can be
moistened with deionized water.
Note
For further details on proper storage, refer to the operating manual of
the sensor.
Moistening the
quiver insert 1Press the quiver out of the holder from the back side of the in-
strument and pull it out completely.
2 Pull off the quiver tip and moisten the sponge rubber with
deionized water.

Cond 1970i Operation
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4 Operation
4.1 Switching on the measuring instrument
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 when the AutoStore function is ac-
tive.
The energy saving feature is also not active
zif the power is supplied by the plug-in power supply,
zif the communication cable and a PC with a running communication
program are connected,
zif the recorder cable is connected,
zif the printer cable is connected (for external printers).
1Connect a conductivity measuring cell to the measuring instru-
ment.
2 Press the <ON/OFF> key.
The display test appears briefly on the display.
Subsequently, the selected cell constant and the temperature
compensation that was set up appear for approx. one second
one after the other.
The measuring instrument then automatically switches to the
measuring mode that was last selected.

Operation Cond 1970i
16 ba75692e02 07/2009
4.2 Measuring
4.2.1 General information
You can measure the following variables:
zConductivity
zSalinity
zTotal dissolved solids (TDS)
The measuring instrument is supplied with the following functions:
zAutoRange (automatic switchover of the measurement range). If a
measuring range is exceeded, AutoRange causes the measuring in-
strument to change automatically to the next higher measuring
range and back again. Therefore, the instrument always measures
in the measuring range with the highest possible resolution. The
function can be switched off.
zThe AutoRead function (drift control) for checking the stability of the
measurement signal. This ensures the reproducibility of the measur-
ing signal. For details of how to switch the AutoRead function on/off,
see page 20.
Preparatory activities Perform the following preparatory activities when you want to measure:
Warning
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result. The RS232
interface is not galvanically isolated.
Temperature
compensation and
reference temperature
Tref
The calculation of the temperature compensation is based on the pre-
set reference temperature, 20 °C or 25 °C. For more detailed informa-
tion concerning the temperature compensation, see section 4.4 on
page 28.
1Connect a conductivity measuring cell to the measuring instru-
ment.
2 Calibrate or check the measuring instrument with the measur-
ing cell. How to calibrate is described in section 4.3.
3Select the measuring mode with <M>.

Cond 1970i Operation
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Measuring the
temperature
For the temperature compensation, it is required to measure the tem-
perature of the test sample.
You have the following possibilities of measuring the temperature:
zThe temperature sensor integrated in the sensor measures the tem-
perature automatically (example: TetraCon 325).
zAutomatic temperature measurement by the external temperature
sensor (accessory) NTC30 or Pt1000. This method is required
when using conductivity measuring cells without integrated temper-
ature sensor. Connection of the temperature sensor, see
section 1.3 SOCKET FIELD.
zYou measure and enter the temperature manually.
Note
The instrument automatically recognizes the type of the used tempera-
ture sensor (NTC30 or Pt1000). The temperature sensor is shown on
the display by TP.
If you use a conductivity measuring cell electrode without a tempera-
ture sensor, proceed as follows:
Note
When determining the cell constant without a temperature sensor, also
set the current temperature of the control standard manually using the
<▲> <▼>keys.
1Measure the current temperature of the test sample using a
thermometer.
2 Enter the temperature on the instrument: Set the temperature
value of the test sample using <▲> <▼>.

Operation Cond 1970i
18 ba75692e02 07/2009
4.2.2 Conductivity
You can carry out the conductivity measurements as follows:
4.2.3 Salinity
You can carry out the salinity measurements as follows:
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3Press the <M> key until appears in the status display. De-
pending on the setting, one of the following display indicators
appears on the display:
4Wait for a stable measured value.
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3Press the <M> key repeatedly until the Sal status display ap-
pears. The salinity value appears on the display.
4Wait for a stable measured value.
REL1
Sal
Cal RCL
%
cm
1/
S
0
%
m
mg/l
O
Oxi AR
Year Ident
No. Day.Month
Tref20
LoBat Lin
Sal
pH
C
TEC
Auto Store
Time Baud
K
/
REL2
pH/mV
240
Tref25
05 3
cm
S/
nLF
°
C
ARng
TP
REL1 Tref25
ARng
S
C
cm
S/
Sal
Cal RCL
%
cm
1/
0
%
m
mg/l
O
Oxi AR
Year Ident
No. Day.Month
Tref20
LoBat Lin
pH
TEC
Auto Store
Time Baud
K
/
REL2
pH/mV
212
332
nLF
°
C
TP
Sal

Cond 1970i Operation
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4.2.4 TDS (Total dissolved solids)
You can measure the total dissolved solids as follows:
1Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3Press the <M> key until the unit mg/l appears.
The value of the total dissolved solids appears in the upper dis-
play line. The TDS factor appears in the lower display line.
4Using <▲> <▼>, set the TDS factor (0.40 ... 1.00).
(The TDS factor has to be determined by a comparative mea-
surement before.)
5Wait for a stable measured value.
TP
°
C
Sal
%
REL1
ARng
S
C
cm
S/
Sal
Cal RCL
%
cm
1/
0
m
O
Oxi AR
Year Ident
No. Day.Month
Tref20
LoBat Lin
pH
TEC
Auto Store
Time Baud
K
/
REL2
pH/mV
10 0
447
mg/l
Tref25
nLF
TP
°
C
Sal
%
REL1
ARng
S
C
cm
S/
Sal
Cal RCL
%
cm
1/
0
m
O
Oxi AR
Year Ident
No. Day.Month
Tref20
LoBat Lin
pH
TEC
Auto Store
Time Baud
K
/
REL2
pH/mV
082
839
mg/l
Tref25
nLF

Operation Cond 1970i
20 ba75692e02 07/2009
4.2.5 AutoRead AR (drift control) and hold function
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. With the aid of the hold function the
measured value display is frozen.
Use the AutoRead function and hold function like this:
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
1Select the required measuring mode with <M>.
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
3Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
4If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
5 To terminate AutoRead: Press the <AR> key.
REL1
Sal
Cal RCL
%
cm
1/
S
0
%
m
mg/l
O
Oxi
Year Ident
No. Day.Month
Tref20
LoBat Lin
Sal
pH
C
TEC
Auto Store
Time Baud
K
/
REL2
pH/mV
2 5 0
Tref25
05 3
cm
S/
nLF
°
C
ARng
TP
AR