Oxi 1970i
ON / OFF
CAL
O
7
92
1 7 6
°
C
R
A
R
n
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RCL
M
AUTO READ
RUN / ENTER
E
STO
Operating manual
m
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l
T
P
L
1
Oxi 1970i
ba75691e01 01/2007
Portable oxygen measuring instrument
Oxi 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.
2
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Oxi 1970i Contents
Oxi 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 Measuring the D. O. concentration . . . . . . . . . . 17
4.2.3 Measuring the D. O. saturation . . . . . . . . . . . . . 18
4.2.4 Automatic selection of the measuring range,
AutoRange . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.5 AutoRead AR (drift control) and hold function . . 19
4.2.6 Sensor with stirrer (StirrOx G) . . . . . . . . . . . . . . 20
4.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3.1 Calibrating with the air calibration vessel . . . . . 23
4.3.2 Calibrating via a comparison measurement . . . 25
4.3.3 Entering the salt content (salinity) . . . . . . . . . . . 27
4.4 Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.4.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 28
4.4.2 Saving automatically . . . . . . . . . . . . . . . . . . . . . 30
4.4.3 Outputting the data storage . . . . . . . . . . . . . . . . 32
4.4.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 36
4.5 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.5.1 Data transmission interval (Int 2) . . . . . . . . . . . 37
4.5.2 Recorder (analog output) . . . . . . . . . . . . . . . . . 39
4.5.3 PC/external printer (RS232 interface) . . . . . . . . 40
4.5.4 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 40
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Contents Oxi 1970i
4.6 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.7 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 47
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.2 Measuring ranges, resolutions, accuracies . . . . . . . . . . 56
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4
ba75691e01 01/2007
Oxi 1970i Overview
RUN / ENTER
1Overview
The portable Oxi 1970i measuring instrument enables you to carry out
oxygen measurements rapidly and reliably.
The Oxi 1970i provides the maximum degree of operating comfort, reliability and measuring certainty for all applications.
The proven OxiCal
®
calibration procedure supports you in your work
with the measuring instrument. The special AutoRead function enables
precise measurements.
1
ON / OFF
M
AUTO READ
RUN / ENTER
CAL
2
O
7
92
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°
C
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P
R
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1
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R
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RCL
STO
Oxi 1970i
3
4
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5
1 Keypad
2 Display
3 Integrated, exchangeable sensor quiver
4 Socket field
5 Carrying and positioning handle
5
Overview Oxi 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
O
Sal
Time
Day.Month
Year
LoBat
S
1
Baud
No.
Ident
Tref25 Tref20
nLF
Lin
8
88
8 8 8 8
Store
Auto
Cal
TEC
Oxi
ARng
%
m
1/
°
S/
C
pHmV/
mg/l
cm
cm
K
%
/
AR
Sal
TP
REL2REL1
RCL
Sensor symbol
Measured value
display
Function and
Temperature display
6
ba75691e01 01/2007
Oxi 1970i Overview
RCL
STO
1.2 Keypad
Key functions
ON / OFF
M
CAL
AUTO READ
RUN / ENTER
Calibrate
Switch measuring instrument on/off
<ON/OFF>
Select the measuring mode <M>:
– D. O. concentration
– Oxygen saturation
<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
<▼ >
RCL
STO
Display/transmit measured values
<RCL>
Save a measured value
<STO>
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7
Overview Oxi 1970i
1.3 Socket field
Sensors You can use the following sensors with the Oxi 1970i:
z Oxygen depth armature
z D. O. sensor CellOx 325, or
z D. O. sensor DurOx 325, or
z Self-stirring D. O. sensor StirrOx G
Connectors
2
3
4
1
5
Sensor / Instrument Socket
Oxygen sensor 1
Integrated stirrer StirrOx G 2
Printer or PC (serial interface, RS232) 3
Plug-in power supply unit 4
Watertight valve for internal pressure equalization 5
Warning
Only connect sensors to the measuring instrument that cannot return
any voltages or currents that are not allowed (> SELV and > current circuit with current limiting). Nearly all sensors - especially WTW sensors
- fulfill these conditions.
8
ba75691e01 01/2007
Oxi 1970i Safety
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the measuring instrument . Consequently, all responsible personnel must read this
operating manual before working with the measuring system. The operating manual must always be available within the vicinity of the measuring system.
Target group The measuring instrument was developed for work in the field and in
the laboratory.
We assume that, as a result of their professional training and experience, the operators will know the necessary safety precautions to take
when handling chemicals.
Safety
instructions
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 the dissolved oxygen (D. O.) content of liquid media 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
ba75691e01 01/2007
9
Safety Oxi 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.
ba75691e01 01/2007
Oxi 1970i Commissioning
3 Commissioning
3.1 Scope of delivery
z Portable measuring instrument, Oxi 1970i with integrated recharge-
able 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.
Note
The automatic stirring function of the self-stirring D. O. sensor
StirrOx G can only be used when the plug-in power supply is connected.
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 Oxi 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
ba75691e01 01/2007
Oxi 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 Oxi 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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Oxi 1970i Operation
4 Operation
4.1 Switching on the measuring instrument
1 Connect the D. O. sensor to the measuring instrument.
2 Press the <ON/OFF> key.
The display test appears briefly on the display.
The relative slope for the sensor type that was just connected
subsequently appears for approx. one second.
The measuring instrument then automatically switches to the
measuring mode that was last selected. The display shows the
relevant measured value.
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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Operation Oxi 1970i
4.2 Measuring
4.2.1 General information
You can measure the following variables:
z D. O. concentration
z D. O. saturation
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 19.
Preparatory activities Perform the following preparatory activities when you want to measure:
1 Connect the D. O. sensor to the measuring instrument (see
section 1.3 S
OCKET FIELD).
2 Calibrate or check the measuring instrument with the D. O.
sensor. How to calibrate is described in section 4.3.
3 Select the measuring mode with <M>.
Note
Incorrect calibration of D. O. sensors will result in incorrect measured
values. Calibrate at regular intervals.
Note
The measuring instrument automatically recognizes the type of the D.
O. sensor (CellOx 325 or DurOx 325).
Temperature sensor The D. O. sensor has an integrated temperature sensor that always
measures the current temperature of the test sample.
16
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.
ba75691e01 01/2007
Oxi 1970i Operation
4.2.2 Measuring the D. O. concentration
Note
When measuring the concentration of test samples with a salt content
of more than 1 g/l, a salinity correction is required. For this, you have to
measure and input the salinity of the measured medium first. This is described in section 4.3.3 on page 27.
Switching the salt content correction on or off, see below.
To measure the D. O. concentration with and without salt content correction, proceed as follows:
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the D. O. sensor in the test sample.
3 Press the <M> key repeatedly until the D. O. concentration in
mg/l appears on the display.
Switching on/off the salt
content correction
m
m
%
1/
°
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
REL2
pH/mV
cm
K
/
REL2
Sal
TP
RCL
Sal
TP
RCL
pH
S
O
Sal
Time
Day.Month
Year
LoBat nLF
Proceed as follows to switch on the salt content correction:
1 In the D. O. concentration measuring mode, switch on the salt
pH
7
Lin
8
Oxi
92
1 7 6
Auto
Store
Cal
TEC
ARng
1
Baud
No.
Ident
Tref25 Tref20
content correction with <▲ > . The SAL display indicator appears on the display. The value that was entered is taken into
consideration during the measurement (see section 4.3.3).
S
O
Sal
Time
Day.Month
Year
LoBat nLF
1
Baud
No.
Ident
Tref25 Tref20
Lin
5
8
1 7 6
Oxi
42
Auto
Store
Cal
TEC
ARng
ba75691e01 01/2007
2 Switch the salt content correction off with <▼ >. The SAL dis-
play indicator is no longer displayed.
17
Operation Oxi 1970i
4.2.3 Measuring the D. O. saturation
You can measure the D. O. saturation as follows:
1 Perform the preparatory activities according to section 4.2.1
2 Immerse the D. O. sensor in the test sample.
3 Press the <M> key repeatedly until the saturation in % appears
on the display.
/mV
%
m
1/
°
S/
C
pH
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
S
O
Sal
1
Time
Day.Month
Year
LoBat nLF
8
Baud
No.
Ident
8
Tref25 Tref20
Lin
Oxi
92
1 7 6
Auto
Store
Cal
TEC
ARng
4.2.4 Automatic selection of the measuring range, AutoRange
Sensors You can use the sensors listed in section 1.3 on page 8. The sensor
type is automatically recognized and the resolution is adjusted if necessary (see chapter 7 T
AutoRange Two measuring ranges are available for each measuring mode. 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.
To switch the automatic measurement range selection on/off, see
section 4.6 C
on, ARng appears on the display.
pH
S
ONFIGURATION. When the AutoRange function is switched
O
Sal
Time
Day.Month
Year
LoBat nLF
1
Baud
No.
Ident
Tref25 Tref20
7
8
Lin
Oxi
08
1 7 6
Auto
Cal
ECHNICAL DATA).
mg/l
%
m
S/
1/
cm
%
°
ARng
C
REL1
AR
Store
TEC
pH/mV
cm
K
/
REL2
Sal
TP
RCL
18
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Oxi 1970i Operation
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.
Criteria With identical measurement conditions, the following criteria are valid
for the AutoRead function:
Measuring mode Reproducibility Response time
D. O. concentration
D. O. saturation
index
Use the AutoRead function and hold function like this with the sensors
z Oxygen depth armature
z CellOx 325
z DurOx 325
Note
The special features of the self-stirring D. O. sensor StirrOx G can be
found in section 4.2.6 on page 20.
1 Select the measuring mode with <M>.
2 Activate the AutoRead function with <AR>. The current mea-
sured value is frozen (hold function).
3 Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
better than 0.05 mg/l > 10 seconds
better than 0.6 % > 10 seconds
ba75691e01 01/2007
m
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
Sal
TP
REL2
RCL
pH
S
O
Sal
Time
Day.Month
Year
LoBat nLF
4 If necessary, start the next AutoRead measurement with
7
Lin
8
Oxi
08
1 7 6
Auto
Cal
1
Baud
No.
Ident
Tref25 Tref20
<RUN/ENTER>.
Store
TEC
ARng
19
Operation Oxi 1970i
5 To terminate the AutoRead function: Press the <AR> key.
4.2.6 Sensor with stirrer (StirrOx G)
Connection Connect the 2-pole stirrer plug to the stirrer output of the measuring in-
strument (designation REL1).
Note
The automatic stirring function of the self-stirring D. O. sensor
StirrOx G can only be used when the plug-in power supply is connected.
Stirrer function The D. O. sensor, StirrOx G, has a temperature sensor and stirrer inte-
grated. Using the key on the sensor you switch the stirrer on.
Measuring with
AutoRead
You can switch on the stirrer and start an AutoRead measurement at
the same time. To do so, proceed as follows:
1 Select the measuring mode with <M>.
2 Activate the AutoRead function with <AR>. The current mea-
sured value is frozen (hold function).
3 Submerse the sensor in the test sample and press the stirrer
button. The stirrer is startet. At the same time, the AutoRead
measurement starts. AR flashes until a stable measured value
is achieved. Subsequently, the stirrer switches itself off.
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
S
O
Sal
1
Time
Day.Month
Year
LoBat nLF
7
Baud
No.
Ident
8
Tref25 Tref20
Lin
Oxi
08
1 7 6
Auto
Store
Cal
TEC
ARng
20
ba75691e01 01/2007
Oxi 1970i Operation
4.3 Calibration
Why calibrate? D. O. sensors age. This changes the slope of the D. O. sensor. Calibra-
tion determines the current slope of the sensor and stores this value in
the instrument.
Thus, you should calibrate at regular intervals.
Calibration data records The Oxi 1970i administrates two sets of calibration data:
z Set 1, for sensor class 1: – Oxygen depth armature
– CellOx 325, or
– StirrOx G
z Set 2, for sensor class 2: – DurOx 325
Sensors of different classes can be calibrated separately. When a sensor of one class is calibrated the calibration data of the other class remain stored. The Oxi 1970i recognizes the class of the connected
sensor and automatically uses the correct calibration data.
Calibration procedures The Oxi 1970i provides 2 calibration procedures:
z Calibration in water vapor-saturated air.
To calibrate the CellOx 325, use theOxiCal
®
-SL air calibration vessel (accessory), to calibrate the DurOx 325, use the OxiCal
calibration vessel (contained in the scope of delivery of the sensor).
z Calibration via a comparison measurement (e. g. Winkler titration
according to DIN EN 25813 or ISO 5813). At the same time, the relative slope is adapted to the comparison measurement by a correction factor.
When to calibrate? z After connecting another D. O. sensor
z If the sensor symbol flashes, i. e. after the calibration interval has ex-
pired
Calibration interval The calibration interval (Int 3) is set to 14 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 calibration
data
Each time the instrument is switched on, the calibration data are shown
on the display for a short time (see section 4.1 S
SURING INSTRUMENT). In order to view the calibration data, switch the
WITCHING ON THE MEA-
measuring instrument off and switch it on again.
®
-D air
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21
Operation Oxi 1970i
Printing the
calibration record
The calibration protocol contains the calibration data of the current calibration. You can transmit the calibration protocol to a printer via the serial interface (see page 35).
Note
You can automatically print a calibration record 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 record is printed.
Sample printout:
CALIBRATION PROTOCOL
02.03.02 14:19
Device No.: 12345678
CALIBRATION 02
Cal time: 02.03.02 / 14:19
Cal interval: 14d
OxiCal Tauto AR
Relative Slope: 0,88
Probe: +++
Sensor evaluation After the calibration, the measuring instrument evaluates the current
status of the sensor against the relative slope. The evaluation appears
on the display. The relative slope has no effect on the measuring accuracy. Low values indicate that the electrolyte will soon be depleted and
the sensor will have to be regenerated.
Display Relative slope
S = 0.8 ... 1.25
S = 0.7 ... 0.8
S = 0.6 ... 0.7
E3
S < 0.6 or S > 1.25
Eliminate the error according to
chapter 6 W
HAT TO DO IF...
22
ba75691e01 01/2007
Oxi 1970i Operation
4.3.1 Calibrating with the air calibration vessel
Proceed as follows to calibrate the instrument:
1 Connect the D. O. sensor to the measuring instrument.
2 Keep an air calibration vessel ready for use.
Note
The sponge in the air calibration vessel must be moist (not wet). Follow
the instructions in the OxiCal
3 Put the D. O. sensor into the air calibration vessel.
®
-SL or DurOx 325 operating manual.
4 Press the <CAL> key repeatedly until O
m
m
%
1/
°
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
pH/mV
cm
K
/
Sal
TP
REL2
RCL
Sal
TP
REL2
RCL
pH
S
O
Sal
Time Baud
Day.Month
Year
LoBat
5 Press the <RUN/ENTER> key. AutoRead is active, AR flashes.
pH
1
No.
Ident
Tref25 Tref20
Lin
nLF
S
C
8
1 7 6
Oxi
AL
Auto
Store
ARng
TEC
Cal
O
Sal
Time Baud
Day.Month
Year
LoBat
1
No.
Ident
Tref25 Tref20
Lin
nLF
0
8
1 7 6
Oxi
88
Auto
Store
ARng
TEC
Cal
CAL appears.
2
ba75691e01 01/2007
6 As soon as a stable value is achieved, AR stops flashing. Cal-
ibration is finished; the sensor symbol indicates the relative
slope determined and the sensor evaluation (see page 22).
23
Operation Oxi 1970i
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
S
O
Sal
Time Baud
Day.Month
Year
LoBat
7 Switch to the measuring mode with <M>.
Note
In chapter 6 W
take for error elimination.
1
No.
Ident
Tref25 Tref20
nLF
0
88
8
1 7 6
Auto
Store
Lin
Oxi
Cal
HAT TO DO IF... page 49, you will find the measures to
TEC
ARng
24
ba75691e01 01/2007
Oxi 1970i Operation
4.3.2 Calibrating via a comparison measurement
Proceed as follows to calibrate the instrument:
1 Connect the D. O. sensor to the measuring instrument.
2 Press the <CAL> key repeatedly until O
m
m
%
1/
°
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
pH/mV
cm
K
/
Sal
TP
REL2
RCL
Sal
TP
REL2
RCL
pH
S
O
Sal
Time Baud
Day.Month
Year
LoBat
3 Immerse the D. O. sensor in the calibrating solution.
4 Press the <RUN/ENTER> key.
pH
F
Lin
8
Oxi
AC
1 7 6
Auto
Store
ARng
TEC
Cal
1
No.
Ident
Tref25 Tref20
nLF
The AutoRead measurement begins. If the measured value is
stable, the instrument displays the determined measured value
and the correction factor of the relative slope (initial value =
1.000).
S
O
Sal
Time Baud
Day.Month
Year
LoBat
1
No.
Ident
Tref25 Tref20
Lin
nLF
4
0 0 0
1
Oxi
42
Auto
Store
TEC
Cal
ARng
FAC appears.
2
ba75691e01 01/2007
5 Remove the D. O. sensor from the calibrating solution.
6 Perform a comparison measurement, e. g. Winkler titration,
with the calibrating solution (determine the nominal value).
Leave the measuring instrument switched on until the nominal
value is determined.
7 Set the displayed value on the measuring instrument to the
nominal value with <▲> <▼>. This changes the related correction factor of the relative slope.
25
Operation Oxi 1970i
m
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
Sal
TP
REL2
RCL
pH
S
O
Sal
Time Baud
Day.Month
Year
LoBat
8 Switch to the measuring mode with <M> or <RUN/ENTER> .
Note
If the correction factor deviates from 1.000, the display of the measured
value units flashes.
1
No.
Ident
Tref25 Tref20
Lin
nLF
4
0 0 7
1
Oxi
45
Auto
Store
TEC
Cal
ARng
26
ba75691e01 01/2007
Oxi 1970i Operation
4.3.3 Entering the salt content (salinity)
A salt content correction is required in the oxygen concentration measurement of samples with a salt content of more than 1 g/l. To do this,
you have to enter the salinity equivalent (the measured salinity) of the
test sample (range 0.0 - 70.0) and to switch on the salinity correction.
Parameter Value range
Salinity 0.0 ... 70.0 in steps of 0.1
Entering the
salt content
1 Determining the salinity of the test sample (any method).
2 Press the <CAL> key repeatedly until Sal appears on the dis-
play.
m
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
Sal
TP
REL2
RCL
pH
S
O
Sal
Time Baud
Day.Month
Year
LoBat
3 Enter the salt content with <▲> <▼>.
4 Switch to the measuring mode with <M>.
Note
How to switch on the salt content correction is described on page 17.
1
No.
Ident
Tref25 Tref20
Lin
nLF
5
8
6 9 6
Oxi
50
Auto
Store
Cal
TEC
ARng
ba75691e01 01/2007
27
Operation Oxi 1970i
4.4 Saving
The measuring instrument has an internal data memory. It can store up
to 500 datasets.
A complete data record consists of:
z Storage location
z Date/time
z Measured value
z Temperature
z Temperature measuring procedure
z ID number
You can transmit measured values (data records) to the data storage
in two ways:
z Save manually
z Switch on AutoStore (Int 1).
4.4.1 Saving manually
You can transmit a measured value to the data storage as follows:
1 Press the <STO> key.
The current number (location number No.) of the next free storage location appears under the current measured value on the
display.
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
S
O
Sal
1
Time
Day.Month
Year
LoBat nLF
8437
Baud
No.
Ident
Tref25 Tref20
Lin
8
2 5
Oxi
Auto
Cal
Store
TEC
ARng
2 Confirm with <RUN/ENTER>.
The display switches to entering the ID number.
28
ba75691e01 01/2007
Oxi 1970i Operation
Message StoFull
StoFull This message appears when all of the 500 storage locations are occu-
StoFullStoFull
m
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
Sal
TP
REL2
RCL
pH
S
O
Sal
1
Time
Day.Month
Year
LoBat nLF
8237
Baud
No.
Ident
Tref25 Tref20
Lin
8
2 5
Auto
Oxi
Cal
Store
TEC
ARng
3 Using <▲> <▼>, enter the required ID number
(1 ... 999).
4 Confirm with <RUN/ENTER>.
The instrument changes to the measuring mode.
pied.
You have the following options:
Saving the current measured value.
The oldest measured value (storage location 1)
will be overwritten by this
Press
<RUN/ENTER>
Returning to the measuring mode without
press any key
saving
Outputting the data storage see
section 4.4.3
Clearing the memory see
section 4.4.4
ba75691e01 01/2007
29
Operation Oxi 1970i
4.4.2 Saving automatically
The save interval (Int 1) determines the chronological interval between
automatic save processes.
After the fixed interval has expired, the current data record is transmitted to the storage and to the interface.
The default setting for the save interval (Int 1) is OFF.
Setting the
save interval:
By this, the AutoStore function is switched off.
To switch the function on, set an interval (5 s, 10 s, 30 s, 1 min, 5 min,
10 min, 15 min, 30 min, 60 min):
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <STO> key. Int 1 appears on the display.
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
O
Sal
Time
Day.Month
Year
LoBat
S
I
Baud
Ident
Tref25
nLF
1nt
No.
Lin
d
Tref20
Auto
Cal
Oxi
F
FO
Store
ARng
TEC
3 Set the required interval between the saving procedures with
<▲> <▼>.
4 Confirm with <RUN/ENTER>.
The number of free memory locations appears on the display.
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
O
Sal
Time
Day.Month
Year
LoBat
S
I
Baud
Ident
Tref25
nLF
949
No.
E
F
Tref20
Lin
ER
Store
Auto
Cal
Oxi
TEC
ARng
30
5 As soon as all of the 500 storage locations are occupied,
AutoStore is terminated (Int 1 = OFF).
If there are not enough storage locations available for your
measurements:
– Output and backup the data storage (see page 32) and
– clear the memory (see page 36).
ba75691e01 01/2007
Oxi 1970i Operation
6 Confirm with <RUN/ENTER>.
The prompt for the ID number appears on the display.
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
Ident
Tref25
nLF
949
No.
ERF
Store
TEC
1
ARng
Lin
Tref20
Auto
Cal
Oxi
7 Set the required ID number with <▲> <▼>.
8 Confirm with <RUN/ENTER>.
The instrument switches to the Oxi measuring mode and starts
the measuring and saving process.
AutoStore flashes on the display.
Note
The AutoStore function is interrupted if you start other functions, e.g.
output the data storage.
After the function is finished, the AutoStore function is continued. By
this, however, temporal gaps in the recording of the measured values
will occur.
Switching off AutoStore Switch AutoStore off by:
z setting the save interval (Int 1) to OFF, or
z switching the measuring instrument off and then on again.
ba75691e01 01/2007
31
Operation Oxi 1970i
4.4.3 Outputting the data storage
You can output the contents of the data storage:
z Stored data on the display
z Calibration data on the display
z Stored data on the serial interface
z Calibration protocol on the interface
Outputting stored data
on the display
1 Press the <RCL> key repeatedly until StO dISP appears on the
display.
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
O
Sal
Time
Day.Month
Year
LoBat
S
I
Baud
Ident
Tref25
nLF
oST
No.
SID
P
Store
Auto
Tref20
Cal
Oxi
Lin
TEC
ARng
2 Press the <RUN/ENTER> key.
A measured value appears on the display.
The storage location of the data record is displayed for approx.
2 s, then the respective temperature appears.
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
S
O
Sal
1
Time
Day.Month
Year
LoBat nLF
6
Baud
No.
Ident
8
Tref25 Tref20
Lin
Oxi
03
2 4 7
Auto
Store
Cal
TEC
ARng
32
You can perform the following activities:
Display further elements of the data record
(ID number, date, time, storage location)
Press
<RUN/ENTER>
Advance one data record (storage location) Press <▲ >
Go back one data record (storage location) Press <▼>
ba75691e01 01/2007
Oxi 1970i Operation
Note
If you want to search for a certain element (e.g. date), proceed as follows:
1 Using <RUN/ENTER>, select the element (e.g. date).
2 Press <▲> or <▼> repeatedly until the required date appears
on the display.
After approx. 2 s the temperature of the displayed measured
value appears.
Outputting stored data
to the interface
1 Press the <RCL> key repeatedly until Sto SEr appears on the
display.
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
Ident
Tref25
nLF
oST
No.
Lin
D
Tref20
ES
r
Store
Auto
Cal
Oxi
TEC
ARng
2 Press the <RUN/ENTER> key.
The complete storage content is transmitted to the interface;
during the data transmission the numbers of the currently
transmitted storage locations run through. After the data transmission, the measuring instrument automatically switches to
the measuring mode.
Note
You can cancel the transmission with <M> or <RUN/ENTER>.
ba75691e01 01/2007
After the instrument number, the printout contains the complete storage
contents in ascending order of the storage location numbers.
33
Operation Oxi 1970i
Sample printout:
Device No.: 99990000
No. 1:
09.03.02 17:10
101.7 % 17.6° C
Tauto AR
Ident : 10
No. 2:
09.03.02 17:11
7.11 mbar 17.6° C
Tauto AR
Ident : 10
No. 3:
09.03.02 17:12
7.88 mg/l 17.6° C
Tauto
Ident : 10
No. 4:
09.03.02 17:15
7.11 mg/l 17.8° C
Tauto
SAL = 17.9
Ident : 7
...
Outputting the
calibration data
on the display
1 Press the <RCL> key repeatedly until CAL dISP 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
C
No.
Ident
d
Tref25 Tref20
Oxi
Lin
nLF
AL
I S P
Auto
Store
TEC
ARng
Cal
2 Press the <RUN/ENTER> key.
The relative slope appears on the display:
mV
%
m
1/
°
S/
C
pH/
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
S
O
Sal
1
Time
Day.Month
Year
LoBat nLF
0
Baud
No.
Ident
8
Tref25 Tref20
Oxi
Lin
88
S L
Auto
Cal
Store
TEC
0
ARng
34
ba75691e01 01/2007
Oxi 1970i Operation
3 Using <M> or <RUN/ENTER>, you can switch back to the
measuring mode.
Outputting the
calibration protocol
on the interface
1 Press the <RCL> key repeatedly until CAL SEr appears on the
display.
m
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
Sal
TP
REL2
RCL
RINTING THE CALIBRATION
pH
S
O
Sal
Time Baud
Day.Month
Year
LoBat
2 Press the <RUN/ENTER> key.
Note
You will find a sample calibration protocol in P
RECORD, page 22.
C
Lin
d
Oxi
AL
S E R
Auto
Store
Cal
TEC
ARng
C
No.
Ident
Tref25 Tref20
nLF
The calibration protocol is transmitted to the interface.
After the data transmission, the measuring instrument automatically switches to the measuring mode.
ba75691e01 01/2007
35
Operation Oxi 1970i
4.4.4 Clearing the memory
With this function, you can delete the stored data records. 500 storage
locations will then be available again.
Note
The Clear memory function only appears when there are data records
stored in the memory. Otherwise, the measuring instrument automatically switches to the measuring mode.
Proceed as follows to clear all data records:
1 Switch off the measuring instrument.
2 Press the <STO> key and hold it down.
3 Press the <ON/OFF> key.
The display test appears briefly on the display.
Subsequently, Sto CLr appears.
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
S
O
Sal
Time Baud
Day.Month
Year
LoBat
4 Confirm the clearing process with <RUN/ENTER>.
Note
The calibration data remain stored and can be called up.
S
Lin
d
Oxi
To
C L R
Auto
Store
TEC
ARng
Cal
C
No.
Ident
Tref25 Tref20
nLF
Pressing any other key prevents the clearing, the data records
will remain stored.
36
ba75691e01 01/2007
Oxi 1970i Operation
4.5 Transmitting data
You have the following possibilities of transmitting data:
z One of the following options:
– With the AutoStore function (page 30), measured values are
periodically saved internally (save interval Int 1) and output on the
interface.
– With the Data transmission interval function (Int 2), measured
values are periodically output on the interface (see below).
z With the Output data storage function (page 32), calibration data or
saved measured values are output on the interface.
z Via the analog recorder output (page 39), measured values are out-
put as voltage values.
z With the KOM pilot communication kit (accessory), data can be
transmitted bidirectionally (page 40).
Note
If you connect a recorder (analog output), the output on the digital interface is switched off.
4.5.1 Data transmission interval (Int 2)
The interval for the data transmission (Int 2) determines the chronological interval between automatic data transmissions. After the selected
interval expires, the current data record is transmitted to the interface.
Note
When the AutoStore function is active, the data transmission is performed according to the setting of the save interval (Int 1). Set the save
interval (Int 1) to OFF to activate the Data transmission interval (Int 2).
ba75691e01 01/2007
37
Operation Oxi 1970i
Setting the
Data transmission
interval
The default setting for the interval is OFF.
To start the data transmission, set an interval (5 s, 10 s, 30 s, 1 min, 5
min, 10 min, 15 min, 30 min, 60 min):
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <RCL> key. Int 2 appears on the display.
%
m
1/
°
S/
C
pH/mV
mg/l
cm
cm
%
/
REL1
AR
K
Sal
TP
REL2
RCL
pH
S
O
Sal
Time Baud
Day.Month
Year
LoBat
3 Set the required interval between the saving procedures with
4 Confirm with <RUN/ENTER>.
n
Lin
d
Oxi
T2
O F F
Store
Auto
TEC
ARng
Cal
I
No.
Ident
Tref25 Tref20
nLF
<▲> <▼>.
The measuring instrument automatically switches to the measuring mode.
38
ba75691e01 01/2007
Oxi 1970i Operation
4.5.2 Recorder (analog output)
You can transmit data to a recorder via the analog output. Connect the
analog output to the recorder via the AK323 interface cable.
The data output automatically switches to Recorder output.
Socket assignment
Signal range The signal range of the analog output depends on the measured vari-
Concentration
1 free
2 Plug coding
2
1
4
RS 232
REC
3
3 Ground
4 Analog output
(internal resistance < 5 Ohm)
Note
The analog output is activated automatically in the cable by connecting
2 and 3.
The output on the analog output corresponds to the value shown on the
display.
able and the measuring range:
Measuring range Voltage Resolution
0 ... 19.99 mg/l 0 ... 1999 mV 0.01 mg/l per 1 mV
Saturation
0 ... 90.0 mg/l 0 ... 900 mV 0.1 mg/l per 1 mV
Measuring range Voltage Resolution
0 ... 199.9 0 ... 1999 mV 0.1 % per 1 mV
0 ... 600 % 0 ... 600 mV 1 % per 1 mV
ba75691e01 01/2007
39
Operation Oxi 1970i
CTS
4.5.3 PC/external printer (RS232 interface)
Via the RS 232 interface, you can transmit the data to a PC or an external printer.
Use the AK340/B (PC) or AK325/S (ext. printer) cable to connect the
interface to the devices.
The data output automatically switches to the RS232 interface.
Warning
The RS232 interface is not galvanically isolated.
When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result.
Set up the following transmission data at the PC/printer:
Baud rate selectable between: 1200, 2400, 4800, 9600
Handshake RTS/CTS + Xon/Xoff
Socket assignment
Parity none
Data bits 8
Stop bits 1
1
2 RxD
2
1
4
3
RS 232
REC
4.5.4 Remote control
The measuring instrument can be remotely controlled from a PC. This
requires the KOM pilot communication kit. It is available as an accessory.
The instrument is then controlled via commands that simulate keystrokes and request the current display contents.
3 Ground
4TxD
40
Note
A more detailed description is provided within the scope of delivery of
the communication kit.
ba75691e01 01/2007
Oxi 1970i Operation
4.6 Configuration
You can adapt the measuring instrument to your individual requirements. To do this, the following parameters can be changed (the status
on delivery is marked in bold):
Baud rate 1200, 2400, 4800, 9600
Air pressure display Current value in mbar
(no input possible)
Calibration interval (Int 3) 1 ... 14 ... 999 d
AutoRange ARng On or off
Date/time Any
Note
You can leave the configuration menu at any time with <M> . The parameters that have already been changed are stored.
Baud rate
1 Switch off the measuring instrument.
2 Press the <M> key and hold it down.
3 Press the <ON/OFF> key.
The display test appears briefly on the display. The measuring
instrument then switches automatically to the setting of the
baud rate.
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
Baud
No.
Ident
Tref25 Tref20
Lin
nLF
8 0 04
Store
Auto
Oxi
Cal
TEC
ARng
4 Select the required baud rate with <▲> <▼>.
5 Confirm with <RUN/ENTER>. On the display, the current air
pressure in mbar appears.
ba75691e01 01/2007
41
Operation Oxi 1970i
Displaying the
air pressure
Calibration interval
pH/
P
Store
TEC
ARng
mV
%
m
1/
°
mg/l
S/
cm
%
C
REL1
AR
cm
K
/
REL2
Sal
TP
RCL
pH
S
O
Sal
C
Time Baud
Day.Month
Year
LoBat
CA
No.
Ident
d
Tref25 Tref20
Oxi
Lin
nLF
9 4 9
Auto
Cal
6 Confirm with <RUN/ENTER>. Int 3 appears on the display.
m
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
REL2
Sal
TP
RCL
pH
O
Sal
Time
Day.Month
Year
LoBat
S
I
Baud
Ident
Tref25
nLF
3nt
No.
4
1 4
Auto
Store
Oxi
Cal
TEC
ARng
Lin
d
Tref20
7 Set the required interval in days (d) with <▲> <▼>.
AutoRange automatic
selection of the
measurement range
8 Confirm with <RUN/ENTER>. ARng appears on the display.
m
%
1/
°
mg/l
S/
cm
%
C
REL1
AR
pH/mV
cm
K
/
REL2
Sal
TP
RCL
pH
O
Sal
Time
Day.Month
Year
LoBat
S
I
Baud
Ident
Tref25
nLF
nAR
No.
Lin
d
Tref20
Auto
Cal
Oxi
S
Ey
Store
TEC
ARng
9 Using <▲> <▼>, switch between no and YES.
YES: Switch on AutoRange.
no: Switch off AutoRange.
10 Confirm with <RUN/ENTER>.
The date (day) flashes in the display.
42
ba75691e01 01/2007
Oxi 1970i Operation
Date and time
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
11 Set the date of the current day with <▲> <▼>.
12 Confirm with <RUN/ENTER>.
The date (month) flashes in the display.
13 Set the current month with <▲> <▼>.
14 Confirm with <RUN/ENTER>.
The year appears on the display.
15 Set the current year with <▲> <▼>.
16 Confirm with <RUN/ENTER>.
The hours flash on the display.
17 Set the current time with <▲> <▼>.
18 Confirm with <RUN/ENTER>.
The minutes flash on the display.
19 Set the current time with <▲> <▼>.
20 Confirm with <RUN/ENTER>.
The measuring instrument automatically switches to the measuring mode.
ba75691e01 01/2007
43
Operation Oxi 1970i
4.7 Reset
You can reset (initialize) the measurement parameters and the configuration parameters separately from one another.
Measurement
parameters
Configuration
parameters
The following measured parameters (O
InI) are reset to the default
2
condition:
Measuring mode D. O. concentration
AutoRange automatic measure-
On (YES)
ment range selection
Relative slope 1.00
Correction factor of the relative
1.000
slope
Salinity equivalent 0.0
Salinity correction Off
Note
The calibration data gets lost when the measuring parameters are reset. Recalibrate after performing a reset.
The following configuration parameters (InI) are reset to the delivery
status:
Baud rate 4800
Interval 1
(automatic saving) OFF
Interval 2
(for data transmission) OFF
44
ba75691e01 01/2007
Oxi 1970i Operation
Resetting the
measuring parameters
Resetting the configura-
tion parameters
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <CAL> key.
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
Ident
Tref25
nLF
No.
0 9
Tref20
Lin
iin
n o
Auto
Store
Cal
Oxi
TEC
ARng
3 Using <▲> <▼>, switch between no and YES.
YES: Resetting the measuring parameters
no: Retaining settings.
4 Confirm with <RUN/ENTER>.
The measuring instrument switches to the configuration parameters.
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
Ident
Tref25
nLF
No.
0 9
Tref20
Lin
iin
n o
Auto
Store
Cal
Oxi
TEC
ARng
ba75691e01 01/2007
5 Using <▲> <▼>, switch between no and YES.
YES: Resetting the configuration parameters
no: Retaining settings.
6 Confirm with <RUN/ENTER>.
The measuring instrument automatically switches to the measuring mode.
45
Operation Oxi 1970i
46
ba75691e01 01/2007
Oxi 1970i Maintenance, cleaning, disposal
5 Maintenance, cleaning, disposal
5.1 Maintenance
The measuring instrument is maintenance-free.
5.2 Cleaning
Occasionally wipe the outside of the measuring instrument with a
damp, lint-free cloth. Disinfect the housing with isopropanol as required.
Warning
The housing components are made out of synthetic materials
(polyurethane, ABS and PMMA). Thus, avoid contact with acetone and
similar detergents that contain solvents. Remove any splashes immediately.
5.3 Disposal
Packing This measuring instrument is sent out in a protective transport packing.
We recommend: Keep the packing material. The original packing protects the measuring instrument from transport damages.
Rechargeable battery Remove the rechargeable battery from the instrument and dispose of it
at a suitable facility according to local legal requirements. It is illegal to
dispose of the rechargeable battery with household refuse. Proceed as
follows to disassemble the rechargeable battery:
1
Ni-Cd Cd
1
1 Remove the carrying and positioning handle or the carrying
strap.
2
ba75691e01 01/2007
2 Unscrew the fixing elements (1) using a hexagon key.
3 Remove the instrument from the enclosure by vigorously
pressing against the socket field.
4 Take out the rechargeable battery (2) and cut off the battery ca-
ble.
47
Maintenance, cleaning, disposal Oxi 1970i
Measuring instrument, Dispose of the measuring instrument without the rechargeable battery
as electronic waste at an appropriate collection point.
48
ba75691e01 01/2007
Oxi 1970i What to do if...
6 What to do if...
Display LoBat
Instrument does not
react to keystroke
Cause Remedy
– Battery almost empty – Charge the battery (see
section 3.2)
Cause Remedy
– Operating condition undefined
or EMC load unallowed
– Processor reset:
Press the <RCL> and
<ON/OFF> keys at the same
time and release them again.
The software version is
displayed.
Error message 0FL
Error message E3
0FL
0FL0FL
E3
E3E3
Cause Remedy
Display range exceeded
Oxygen sensor:
– Not connected – Connect the sensor
– Cable broken – Replace sensor
– Depleted – Replace sensor
– Short-circuit between gold and
lead electrode
– Clean sensor and replace it if
necessary
Cause Remedy
Invalid calibration
Oxygen sensor:
– Electrolyte solution depleted – Regenerate sensor
– Membrane contaminated – Clean membrane
ba75691e01 01/2007
– Electrode system poisoned – Regenerate sensor
– Obsolete – Replace sensor
– Broken – Replace sensor
49
What to do if... Oxi 1970i
Error message E7
E7
E7E7
AR flashes
continuously
Measured value too low
Cause Remedy
Membrane damaged
– Membrane damaged – Regenerate sensor
– Membrane head not screwed
– Screw membrane head tight
on tight enough
Cause Remedy
No stable measured value
– Membrane contaminated – Clean membrane
Cause Remedy
– Insufficient
– Provide flow to the sensor
flow
Measured value too
high
to
Display
to
toto
Sensor symbol flashes
Cause Remedy
– High amount of dissolved
substances
– Air bubbles bump on the
membrane with high velocity
– The carbon dioxide pressure is
– Correct solubility function
using the salinity equivalent
– Avoid direct flow to the
membrane
– Measuring not possible
too high (> 1 bar)
Cause Remedy
– Time-out of the interface – Check the instrument
connected
Cause Remedy
– Calibration interval expired – Recalibrate the measuring
system
50
ba75691e01 01/2007
Oxi 1970i What to do if...
Message StoFull
StoFull
StoFullStoFull
Cause Remedy
– All memory locations are full – Output data storage and clear
data storage
You want to know which
Cause Remedy
software version is in
the instrument
– E. g., a question by the WTW
service department
– Simultaneously press the
<CAL> and <ON/OFF> keys
and release them again. The
software version is displayed.
ba75691e01 01/2007
51
What to do if... Oxi 1970i
52
ba75691e01 01/2007
Oxi 1970i Technical data
7 Technical data
7.1 General data
Test certificates cETLus, CE
Dimensions approx. 90 x 200 x 190 mm
Weight approx. 1.5 kg (without plug-in power supply)
Mechanical structure Type of protection: IP 67
Electrical safety Protective class: III
Ambient
conditions
Operation -10 °C ... + 55 °C
Storage - 25 °C ... + 65 °C
Climatic class 2
Power supply
Rechargeable battery Nickel-cadmium (NiCad)
rechargeable battery
Operational life approx. 600 hours with one charging
Plug-in power supply
unit
(charging device)
The following applies to all plug-in power
supplies:
Connection max.
Overvoltage category II
Plug-in power supply unit
(Euro, US , UK, Australian plug)
FRIWO FW7555M/09, 15.1432
Friwo Part. No. 1883259
Input: 100 ... 240 V ~ / 50 ... 60 Hz / 400 mA
Output: 9 V = / 1,5 A
ba75691e01 01/2007
53
Technical data Oxi 1970i
Serial interface Automatic switchover when a PC or a printer is connected via the cable,
AK 340/B or AK 325/S.
Type RS232, data output
Baud rate Can be set to
1200, 2400, 4800, 9600 Baud
Data bits 8
Stop bits 2
Parity None
Handshake RTS/CTS + Xon/Xoff
Cable length Max. 15m
Analog output (AK 323/
S cable)
Automatic switchover when the recorder is connected by the cable,
AK 323/S.
pH output signal -200 ... +1999 mV for the range
- 2.00 ... + 19.99
mV output signal -1999 ... +1999 mV for the range
-1999 ... +1999 mV for the range
Accuracy ± 0.5 % of display value
Internal resistance < 5 Ohm (current limited to max. 0.2 mA
output current)
Variable Voltage Resolution
Saturation [%] / Range
0 ... 200.0 %
0 ... 600 %
0 ... 2 V
0 ... 600 mV
± 0.1
± 1
Concentration [mg/l] / Range
0...20.00 mg/l
0...100.0 mg/l
0 ... 2 V
0 ... 1 V
0.01 mg/l
0.1 mg/l
54
Accuracy ± 0.5 % of display value
± 0.1(% saturation)
or
± 0.5 % of the display value ± 0.01 mg/l
ba75691e01 01/2007
Oxi 1970i Technical data
Internal resistance < 5 Ohm (current limited to max. 0.2 mA out-
put current)
ba75691e01 01/2007
55
Technical data Oxi 1970i
Guidelines
and norms used
Measuring ranges,
resolutions
EMC E.C. guideline 89/336/EEC
EN 61326-1:1997
EN 61000-3-2 A14:2000
EN 61000-3-3:1995
FCC Class A
Instrument safety E.C. guideline 73/23/EEC
EN 61010-1 A2:1995
Climatic class VDI/VDE 3540
IP protection EN 60529:1991
7.2 Measuring ranges, resolutions, accuracies
Note: The values given in brackets apply to the sensor DurOx 325 especially.
Variable Measuring range Resolution
Concentration [mg/l] 0 ... 19.99 (0 ... 19.9)
0 ... 90.0 (0 ... 90)
0.01 (0.1)
0.1 (1)
Accuracy
(± 1 digit)
Correction functions
Saturation [%] 0 ... 199.9 (0 ... 199)
0 ... 600
0.1 (1)
1
T [°C] 0 ... 50.0 0.1
Variable Accuracy
Concentration [mg/l] ± 0.5 % of measured value
at ambient temperature of + 5 °C ... + 30 °C
Saturation [%] ± 0.5 % of measured value
when measuring in the range of ± 10 K
around the calibration temperature
T [°C] ± 0.1
Temperature com-
Accuracy better than 2 % at 0 ... + 40 °C
pensation
Salinity correction 0 ... 70.0 SAL
56
ba75691e01 01/2007
Oxi 1970i Technical data
Air pressure correction
Automatic through integrated
pressure sensor in the range of 500 ... 1100
mbar
ba75691e01 01/2007
57
Technical data Oxi 1970i
58
ba75691e01 01/2007
Oxi 1970i Lists
8Lists
This chapter provides additional information and orientation aids.
Abbreviations The list of abbreviations explains the indicators and the abbreviations
that appear on the display and in the manual.
Specialist terms The glossary briefly explains the meaning of the specialist terms. How-
ever, terms that should already be familiar to the target group are not
described here.
Index The index helps you to find the topics that you are looking for.
59
Lists Oxi 1970i
Abbreviations
AR AutoRead (drift control)
ARng Automatic range switching
Measuring instrument measures with highest resolution
°C Temperature unit, degrees Celsius
Cal Calibration
E3 Error message
see chapter 6 W
HAT TO DO IF...
InI Initialization
Resets individual basic functions to the status they
had on delivery
LoBat Battery almost empty (Low Battery)
OFL Display range exceeded (Overflow)
OxiCal Automatic calibration for D. O. measurements
SAL Salinity
SELV Safety Extra Low Voltage
TP Temperature measurement active (Temperature
Probe)
60
Oxi 1970i Lists
Glossary
Adjusting To manipulate a measuring system so that the relevant value (e. g. the
displayed value) differs as little as possible from the correct value or
a value that is regarded as correct, or that the difference remains within the tolerance.
Amperometry Name of a measuring technique. The signal (depending on the mea-
sured parameter) of the sensor is the electric current. The electrical
voltage remains constant.
AutoRange Name of the automatic selection of the measuring range.
AutoRead WTW name for a function to check the stability of the measured value.
Calibration Comparing the value from a measuring system (e. g. the displayed
value) to the correct value or a value that is regarded as correct. Often, this expression is also used when the measuring system is adjusted at the same time (see adjusting).
D. O. partial pressure Pressure caused by the oxygen in a gas mixture or liquid.
Measured parameter The measured parameter is the physical dimension determined by
measuring, e. g. pH, conductivity or D. O. concentration.
Measured value The measured value is the special value of a measured parameter to
be determined. It is given as a combination of the numerical value and
unit (e. g. 3 m; 0.5 s; 5.2 A; 373.15 K).
Measuring system The measuring system comprises all the devices used for measuring,
e. g. measuring instrument and sensor. In addition, there is the cable
and possibly an amplifier, terminal strip and armature.
Molality Molality is the quantity (in Mol) of a dissolved substance in 1000 g sol-
vent.
OxiCal
®
WTW name for a procedure to calibrate D. O. measuring systems in
water vapor saturated air.
Oxygen saturation Short name for the relative D. O. saturation.
Note: The D. O. saturation value of air-saturated water and the D. O.
saturation value of oxygen-saturated water are different.
Reset Restoring the original condition of all settings of a measuring system.
Resolution Smallest difference between two measured values that can be dis-
played by a measuring instrument.
61
Lists Oxi 1970i
Salinity The absolute salinity SA of seawater corresponds to the relationship
of the mass of dissolved salts to the mass of the solution (in g/Kg). In
practice, this dimension cannot be measured directly. Therefore, the
practical salinity is used for oceanographic monitoring. It is determined by measuring the electrical conductivity.
Salt content General designation for the quantity of salt dissolved in water.
Sample Designation of the sample ready to be measured. Normally, a test
sample is made by processing the original sample. The test sample
and original sample are identical if the test sample was not processed.
Slope The slope of a linear calibration function.
Slope (relative) Designation used by WTW in the D. O. measuring technique. It ex-
presses the relationship of the slope value to the value of a theoretical
reference sensor of the same type of construction.
Standard solution The standard solution is a solution where the measured value is
known by definition. It is used to calibrate a measuring system.
62
Oxi 1970i Index
Index
A
Analog output . . . . . . . . . . . . . . . . . . . 39
Authorized use . . . . . . . . . . . . . . . . . . . 9
AutoRange . . . . . . . . . . . . . . . . . . . . . 18
AutoRead . . . . . . . . . . . . . . . . . . . . . 19
Criteria . . . . . . . . . . . . . . . . . . . . . 19
B
Batteries
Charging
Battery
Charging time
. . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . 11
C
Calibration
start
. . . . . . . . . . . . . . . . . . . . . . . 23
Calibration record . . . . . . . . . . . . . . . . 22
Connecting a printer . . . . . . . . . . . . . . . 40
D
Data record . . . . . . . . . . . . . . . . . . . . 28
Data transmission (interval) . . . . . . . . . . 38
Default condition . . . . . . . . . . . . . . . . . 44
Display . . . . . . . . . . . . . . . . . . . . . . . . 6
Displaying calibration data . . . . . . . . . . 21
Drift control . . . . . . . . . . . . . . . . . . . . 19
E
Electrode evaluation . . . . . . . . . . . . . . 22
Energy saving feature . . . . . . . . . . . . . 15
Error messages . . . . . . . . . . . . . . . . . 49
M
Mains operation . . . . . . . . . . . . . . . . . .11
Measuring range selection . . . . . . . . . . .18
Measuring the D. O. concentration . . . . . .17
Measuring the D. O. saturation . . . . . . . .18
O
Operating safety . . . . . . . . . . . . . . . . . .10
P
Plug-in power supply . . . . . . . . . . . . . . .11
Printing
calibration protocol
. . . . . . . . . . . . . .22
R
Remote control . . . . . . . . . . . . . . . . . . .40
Reset . . . . . . . . . . . . . . . . . . . . . . . . .44
RS232 interface . . . . . . . . . . . . . . . . . .40
S
Safety . . . . . . . . . . . . . . . . . . . . . . . . . .9
safety precautions . . . . . . . . . . . . . . . . . .9
Salt content correction
entering the salinity
switching on . . . . . . . . . . . . . . . . . .17
Save interval . . . . . . . . . . . . . . . . . . . .30
Scope of delivery . . . . . . . . . . . . . . . . .11
Setting the baud rate . . . . . . . . . . . . . . .41
Setting the date . . . . . . . . . . . . 12, 14, 43
Setting the time . . . . . . . . . . . . . . . 12, 43
Slope . . . . . . . . . . . . . . . . . . . . . . . . .21
. . . . . . . . . . . . .27
I
Initial commissioning . . . . . . . . . . . 12, 14
Initialization . . . . . . . . . . . . . . . . . . . . 44
Interval
data transmission
save . . . . . . . . . . . . . . . . . . . . . . . 30
. . . . . . . . . . . . . . 37
K
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . 7
L
LoBat . . . . . . . . . . . . . . . . . . . . . . . . 49
ba75691e01 01/2007
T
Temperature sensor . . . . . . . . . . . . . . .16
63
Index Oxi 1970i
64
ba75691e01 01/2007
Wissenschaftlich-Technische Werkstätten GmbH
Dr.-Karl-Slevogt-Straße 1
D-82362 Weilheim
Germany
Tel: +49 (0) 881 183-0
+49 (0) 881 183-100
Fax: +49 (0) 881 183-420
E-Mail: Info@WTW.com
Internet: http://www.WTW.com
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