Xylem Cond 1970i User Manual
Cond 1970i
ON / OFF
M
CAL
AUTO READ
RUN / ENTER
5
30
S/
RCL
cm
°
C
T
P
R
E
L
1
A
R
n
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Cond 1970i
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Operating manual
ba75692e01 01/2007
Portable conductivity measuring instrument
Cond 1970i
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 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.
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.
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Cond 1970i Contents
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
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Contents Cond 1970i
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
4
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Cond 1970i Overview
RUN / ENTER
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.
1
ON / OFF
M
AUTO READ
RUN / ENTER
1 Keypad
CAL
2
3
4
5
30
S/
RCL
cm
°
C
T
P
R
E
L
1
A
R
n
g
STO
Cond 1970i
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2 5 0
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2 Display
3 Integrated, exchangeable sensor quiver
4 Socket field
5 Carrying and positioning handle
5
Overview Cond 1970i
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.
1.1 Display
Status display indicator
pH
S
O
Sal
1
Time
Day.Month
Year
LoBat nLF
8
Baud
No.
Ident
8 8 8 8
Tref25 Tref20
Oxi
Lin
TEC
m
ARng
88
Auto
Store
Cal
%
1/
°
mg/l
S/
cm
%
C
AR
pH/mV
cm
Sal
K
/
REL2REL1
RCL
Sensor symbol
Measured value
display
TP
Function and
Temperature display
6
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Cond 1970i Overview
RCL
STO
1.2 Keypad
Key functions
ON / OFF
M
CAL
AUTO READ
RUN / ENTER
– Determine or set up the cell constant
Switch measuring instrument on/off
<ON/OFF>
Select the measuring mode <M>:
– Conductivity
– Salinity
– Total dissolved solids (TDS)
– 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
<▲ >
RCL
STO
Select the measuring mode, decrease values,
scroll
<▼ >
Display/transmit measured values
<RCL>
Save a measured value
<STO>
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Overview Cond 1970i
1.3 Socket field
Sensors You can use the following sensors with the Cond 1970i:
z Conductivity depth armature
z Conductivity measuring cell
z Option: External temperature sensor
Connectors
2
4
5
1
6
3
Sensor / Instrument Socket
Conductivity measuring cell or depth armature 1
Temperature sensor, external 2 and 3
Printer or PC (serial interface, RS232) 4
Plug-in power supply unit 5
Watertight valve for internal pressure equalization 6
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.
8
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Cond 1970i Safety
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the conductivity 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
Further notes
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 environment.
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 measurement of conductivity, salinity, temperature and TDS (total
dissolved solids) in the field and laboratory.
The technical specifications as given in chapter 7 T
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 must
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9
Safety Cond 1970i
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 7 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.
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
10
Obligations
of the purchaser
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.
ba75692e01 01/2007
Cond 1970i Commissioning
3 Commissioning
3.1 Scope of delivery
z Portable measuring instrument, Cond 1970i with integrated re-
chargeable battery
z Carrying and positioning handle
z Carrying strap
z Sensor quiver
z Plug-in power supply unit
z Operating manual
3.2 Power supply
Mains operation and
charging the battery
Charging time of the
battery
You can either operate the measuring instrument with the integrated rechargeable 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.
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 T
TA).
ECHNICAL DA-
Warning
Use original plug-in power supplies only (see
chapter 7 T
ECHNICAL DATA).
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11
Commissioning Cond 1970i
Connecting the plug-in
power supply unit
2
1
3
Setting the date and
time
1 Connect 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.
3.3 Initial commissioning
Perform the following activities:
z For mains operation and charging the battery: Connect the plug-in
power supply (see section 3.2 P
z Set the date and time.
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 flashes
on the display (Day.Month display indicator).
OWER SUPPLY).
12
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Cond 1970i Commissioning
m
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
Sal
TP
REL2
RCL
pH
O
Sal
Time
Day.Month
Year
LoBat
S
I
Baud
No.
Ident
0 9 0 4
Tref25
Tref20
nLF
Lin
5t2
Auto
Store
Cal
Oxi
TEC
ARng
4 Set the date of the current day with <▲> <▼>.
5 Confirm with <RUN/ENTER>.
The date (month) flashes in the display.
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 Confirm with <RUN/ENTER>.
The instrument switches to the measuring mode.
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Commissioning Cond 1970i
3.4 Sensor quiver
To store the sensors during field operation and to keep the sensor element 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
1 Press 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.
14
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Cond 1970i Operation
4 Operation
4.1 Switching on the measuring instrument
1 Connect 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.
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 when the AutoStore function is active.
The energy saving feature is also not active
z if the power is supplied by the plug-in power supply,
z if the communication cable and a PC with a running communication
program are connected,
z if the recorder cable is connected,
z if the printer cable is connected (for external printers).
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15
Operation Cond 1970i
4.2 Measuring
4.2.1 General information
You can measure the following variables:
z Conductivity
z Salinity
z Total dissolved solids (TDS)
The measuring instrument is supplied with the following functions:
z AutoRange (automatic switchover of the measurement range). If a
measuring range is exceeded, AutoRange causes the measuring instrument 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.
z The AutoRead function (drift control) for checking the stability of the
measurement signal. This ensures the reproducibility of the measuring 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:
1 Connect 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.
3 Select the measuring mode with <M>.
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
compensation and
reference temperature
Tref
The calculation of the temperature compensation is based on the preset reference temperature, 20 °C or 25 °C. For more detailed information concerning the temperature compensation, see section 4.4 on
page 28.
16
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Cond 1970i Operation
Measuring the
temperature
For the temperature compensation, it is required to measure the temperature of the test sample.
You have the following possibilities of measuring the temperature:
z The temperature sensor integrated in the sensor measures the tem-
perature automatically (example: TetraCon 325).
z Automatic temperature measurement by the external temperature
sensor (accessory) NTC30 or Pt 1000. This method is required
when using conductivity measuring cells without integrated temperature sensor. Connection of the temperature sensor, see
section 1.3 S
OCKET FIELD.
z You measure and enter the temperature manually.
Note
The instrument automatically recognizes the type of the used temperature sensor (NTC30 or Pt1000). The temperature sensor is shown on
the display by TP.
If you use a conductivity measuring cell electrode without a temperature sensor, proceed as follows:
1 Measure 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 <▲ > <▼>.
Note
When determining the cell constant without a temperature sensor, also
set the current temperature of the control standard manually using the
<▲ > <▼> keys.
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17
Operation Cond 1970i
4.2.2 Conductivity
You can carry out the conductivity measurements as follows:
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the <M> key until appears in the status display. De-
pending on the setting, one of the following display indicators
appears on the display:
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
S
O
Sal
C
Time Baud
Day.Month
Year
LoBat
Ident
Tref25
nLF
05 3
No.
0
2 4 0
Tref20
Auto
Store
Cal
Oxi
Lin
TEC
ARng
4 Wait for a stable measured value.
4.2.3 Salinity
You can carry out the salinity measurements as follows:
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the <M> key repeatedly until the Sal status display ap-
pears. The salinity value appears on the display.
18
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
S
O
Sal
C
Time Baud
Day.Month
Year
LoBat
Ident
Tref25
nLF
332
No.
0
2 1 2
Tref20
Auto
Store
TEC
ARng
Cal
Oxi
Lin
4 Wait for a stable measured value.
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Cond 1970i Operation
4.2.4 TDS (Total dissolved solids)
You can measure the total dissolved solids as follows:
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the conductivity measuring cell in the test sample.
3 Press the <M> key until the unit mg/l appears.
The value of the total dissolved solids appears in the upper display line. The TDS factor appears in the lower display line.
m
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
REL2
Sal
TP
RCL
pH
S
O
Sal
C
Time Baud
Day.Month
Year
LoBat
Ident
Tref25
nLF
447
No.
0
1 0 0
Tref20
Auto
Store
TEC
ARng
Cal
Oxi
Lin
4 Using <▲> <▼>, set the TDS factor (0.40 ... 1.00).
(The TDS factor has to be determined by a comparative measurement before.)
m
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
Sal
TP
REL2
RCL
pH
S
O
Sal
C
Time Baud
Day.Month
Year
LoBat
Ident
Tref25
nLF
839
No.
0
0 8 2
Tref20
Auto
Store
TEC
ARng
Cal
Oxi
Lin
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5 Wait for a stable measured value.
19
Operation Cond 1970i
4.2.5 AutoRead AR (drift control) and hold function
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. With the aid of the hold function the
measured value display is frozen.
Use the AutoRead function and hold function like this:
1 Select the required measuring mode with <M>.
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
3 Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
Sal
K
REL2
RCL
pH
S
O
Sal
C
Time Baud
Day.Month
Year
LoBat
Ident
Tref25
nLF
05 3
No.
0
2 5 0
Tref20
Auto
Store
Cal
Oxi
Lin
TEC
ARngTPAR
4 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
5 To terminate AutoRead: Press the <AR> key.
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
20
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Cond 1970i Operation
4.3 Determining/setting up the cell constant [C]
Why determine/set up
the cell constant?
Procedure The cell constant is determined in the control standard, 0.01 mol/l KCl.
Aging slightly changes the characteristics of the cell, e. g. by coatings.
As a result, an inexact measured value is displayed. The original characteristics of the cell can often be restored by cleaning the cell. Calibration determines the current cell constant and stores it in the instrument.
Thus, you should calibrate at regular intervals (we recommend: every
6 months).
You can determine the actual cell constant of the conductivity measuring cell by calibrating with the control standard in the following ranges:
z 0.450 ... 0.500 cm
-1
(e.g. TetraCon, nominal cell constant 0.475)
z 0.800 ... 1.200 cm
-1
(cells with a cell constant of approx. 1)
Besides, you can set the cell constant manually in the following ranges:
z 0.090 ... 0.110 cm
z 0.250 ... 2.500 cm
-1
-1
The fixed cell constant, 0.010 cm-1 can also be selected. It is not necessary to calibrate or adjust it.
Cell constants outside the above mentioned ranges cannot be calibrated.
Calibration interval The interval for the determination of the cell constant (Int 3) is set to 180
days in the factory. You can select the interval in the range of 1 ... 999
days.
AutoRead The calibration procedure automatically activates the AutoRead func-
tion.
Displaying the
adjusted
cell constant
Each time the instrument is switched on, the adjusted cell constant and
temperature compensation are shown on the display for a short time
(see section 4.1 S
WITCHING ON THE MEASURING INSTRUMENT). In order to
view the data, switch the measuring instrument off and switch it on
again.
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