VWR DO-230 User manual

Instruction manual
VWR® DISSOLVED OXYGEN METER DO-230
EU Catalogue Number: 664-0236
Version: 1.0
Issued: 1, December, 2020

Legal Address of Manufacturer
VWR International bv
Researchpark Haasrode 2020
Geldenaaksebaan 464
B-3001 Leuven
+ 32 16 385011
www.vwr.com
Country of origin: Poland

CONTENTS
I. Introduction 1
1. Package content 2
2. Exploitation notices 2
3. Characteristics of the meter 2
4. The outside view 3
5. The meter‘s maintenance 5
6. Switching the meter on and off 6
6.1. Stabilised reading 7
7. Preparation to work 8
7.1. Choosing the kind of the temperature compensation 8
II. Oxygen concentration measurement 9
8. Basic information about the oxygen measurement 10
9. Entering the oxygen measurement parameters 12
9.1. Unit 12
9.2. Calibration points and date 12
9.3. Calibration validity time 13
9.4. The salinity influence compensation 13
9.5. Atmospheric pressure influence compensation 15
10. Calibration of the oxygen sensor 16
11. Measurement of oxygen concentration in water 18
11.1. Measurement with automatic temperature compensation 18
11.2. Measurement with manual temperature compensation 19
12. Measurement of oxygen content in air 20
III. Temperature measurement 21
13. Setting the temperature measurement parameters 22
13.1. Unit 22
13.2. Temperature of the manual compensation 22
14. Temperature measurement 23
IV. Options 24
15. Options screen 25
15.1. Functions 25
15.2. Memory 25
15.3. Miscellaneous 25
15.4. Info 27
16. Memorising readings, memory readout 28
16.1. Entering readings into the memory 28
16.2. Viewing and deleting readings 29
17. Power, replacing the rechargeable batteries 30
18. Technical data 31
19. Ordering information 32
20. Technical service 33
21. Warranty 33
22. Equipment disposal 34

I. INTRODUCTION

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VWR Collection DO-230 dissolved oxygen meter instruction manual v1.0x
1. PACKAGE CONTENT
The standard set includes:
1. DO-230 dissolved oxygen meter.
2. Dissolved oxygen sensor with temperature sensor.
3. Accessories for the sensor: two membranes, electrolyte – 30 ml,
sodium sulphite – 50 g.
4. Plastic case.
5. 5V/1000mA power adapter.
2. EXPLOITATION NOTICES
Dear User!
Wide range of additional functions requires careful reading of the
manual, in other case some of the features may stay unused or using
the meter may be troublesome.
Accuracy of oxygen measurements depends on the sensor’s calibration and
regular conservation which consists in replacing the membranes, electrolyte
and cleaning the electrodes. Neglecting these activities after some time
would make measurements impossible. Please turn your attention to
the fact that stable measurement is possible only with natural or
simulated water flow.
We wish a pleasant and trouble-free work with our meter.
3. CHARACTERISTICS OF THE METER
Two kinds of power source: the rechargeable battery and the power adapter,
enable work in field and long-lasting measurements in laboratory. The meter’s
memory is independent from power supply. Waterproof housing enables
working in difficult conditions. Minimised size and weight facilitate field work.
The most important features of DO-230 are:
- measuring of oxygen dissolved in water in % or mg/l, oxygen content in air
in % and temperature of solutions or air in 0C, 0F or K;
- automatic and manual temperature compensation;
- compensation of the salinity and the atmospheric pressure influence on the
oxygen concentration measurement;
- storing of the calibration date and parameters of oxygen sensor;
- possibility of introducing the date of calibration validity termination and
signalising its expiry;
- cooperation with Pt-1000 resistor temperature sensor;
- signalising of the reading stabilisation;
- storing measurement results with time and date;
- real time clock with date;
- automatic switch off after time set by the user.

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4. THE OUTSIDE VIEW
On the front wall of the meter there is a graphic LCD placed (Pic. 1), which
displays the following measurement functions:
- oxygen concentration measurement in % or mg/l;
- temperature measurement.
At the top of the LCD the current time and date are displayed.
Choosing particular functions is described in the chapter 6.1. Symbols of the
units are displayed next to the reading.
Pic. 1.
The automatic temperature compensation is signalised by the symbol, the
manual compensation – by the symbol (next to the temperature reading).
The exclamation symbol (Pic. 1.) is displayed on the left in the following
situations marked with the colours:
yellow - the calibration validity date expired;
red - characteristic erase, the sensor calibration necessary.
The rechargeable battery condition is signalised by the symbol.

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VWR Collection DO-230 dissolved oxygen meter instruction manual v1.0x
The button (Pic. 2) placed below the display is used for switching the
meter on and off.
In case of recording readings, the button is locked until the recording
process is stopped or finished.
In the upper wall of the meter connectors are placed with the symbols given
below:
F-BNC-50 input for connecting the dissolved oxygen sensor;
t-Chinch input to connect the temperature probe;
P- input for connecting the power adapter;
Pic. 2.

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5. THE METER‘S MAINTENANCE
The meter is equipped with a graphic touch screen. The maintenance
consists in pressing particular keys and windows which appear on the
screen. Grey captions in the windows and keys inform that these elements
are not active in this particular operating mode. Particular keys, connected
with the measurement function (i.e. or ) become active after
selecting the chosen function. To select, press the screen in a freely chosen
spot of the chosen function. Around this spot a frame will display. To
deselect, press the spot again. If the chosen function has a possibility of
calibration, the key becomes active. If it has additional parameters,
the key also becomes active. The key is the only key in the
meter that responds exclusively to a long press (about 2 sec.). It prevents
from accidental erase of the electrode (sensor, cell) calibration data.
Entering incorrect value, attempt of calibration when the meter doesn‘t
recognise the standard or attempt to turn the meter off when the result
memorising proceeds are signalised by a triple warning sound, irrespective of
the chosen sound settings.

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VWR Collection DO-230 dissolved oxygen meter instruction manual v1.0x
6. SWITCHING THE METER ON AND OFF
After switching the meter on with the button, the memory test proceeds.
If the test ends successfully, the meter enters the measurement screen with
settings entered before switching it off previously. In case of detecting the
manufacturer‘s calibration data loss, the following information will appear:
Pressing the button accepts standard manufacturer‘s calibration
parameters and enters the measurement screen. Such situation will be
repeating each time the meter is switched on and requires sending the meter
to the manufacturer for servicing.
In case of the user‘s data loss (i.e. the oxygen sensor characteristic), the
following information will appear:
Pressing the button accepts and records in the memory standard pH
electrode characteristic and enters the measurement screen. In such case,
calibration of the pH electrode is necessary. Analogical situation occurs in
case of other measuring functions. Repeating of the situation after switching
the meter on again informs about the EEPROM memory malfunction and
requires sending the meter to the manufacturer for servicing.
Switch the meter off by pressing the button. If the meter is powered only
by the internal rechargeable battery, it turns off after the time of non-use set
by the user (description in the chapter 15.3). This function is deactivated
during calibration, while memorising results and connecting with a computer
or power adapter.