Users Manual
Introduction
Congratulations on choosing the UMS Oxygen Sensor 201®!
With the UMS Oxygen Sensor 201® you have purchased a highly innovative
product.
Please read these instructions carefully to avoid any possible damage to the sensor and
measuring instrument.
CONTENTS
1. Components supplied1. Components supplied
- measuring unit
- sensor with calibration chamber
- 9V battery
- transport case
- this manual
Carefully unpack the components and check for completeness.
2. Handling instructions
The heart of the oxygen sensor is the highly sensitive sensor tip.
If the sensor tip is accidentally knocked, the membrane at the tip can be damaged.
Constantly increasing display figures and overflow indicate a damaged membrane. In this
case the sensor must be replaced.
3. Explanation of operation
1 On / Off - switch
2 Calibration key
3 SET: activates the menu ( from measuing mode ) or for selecting an item in the menu
4 ENTER: saves a value ( in measuring mode ) or confirms a selection in the menu
4. Operation
On top of the measuring unit is the connector for the oxygen sensor. Connect the plug
of the sensor cable with this connector.
If not yet done put a 9V battery or accumulator (8.4 V also possible) into the battery
case and connect it with the battery plug.
For an accurate calibration enter the correct air pressure as described at point 9.5.
5. Calibration
For calibration put the sensor into the calibration chamber and press the
"Cal."-key at the measuring unit. The calibration runs automatically and stops
if the calibration value is stable.
On the bottom end of the calibration chamber there is a white plug containing a sponge.
This sponge must be made damp approximately all 4 weeks as follows:
remove the white plug
put some drops of water on the sponge until it is damp
close the calibration chamber
after 15 minutes the calibration can be started
The sensor should be stored in the calibration chamber. It is very important to keep the sponge all the time damp.
Hint:
Your oxygen measurement system is a highly innovative product. Your contribution for
exact measuring is the calibration of the system.
Frequent calibration increases accuracy of measurement!
6.
MeasurementAfter calibrating the measurement system you can start measuring in your media.
Hint:
You should place the sensor tip in middle depth in the vessel (minimum 5 cm below the
surface).
The sensor needs a minimum flow or a constant flow. Please consider this if installing the
sensor in a system.
7. Description of the display in measuring mode
1: oxygen content in % saturation
2: oxygen content in mg/l
3: temperature in °C
4: diagram shows the last 50 values in mg/l or warning if battery discharged
The measurement instrument has an measurement memory for 50 sets of values ( %sat, mg/l and temperature ). Actual values are stored by pressing the "ENTER"-key in measurement mode. The corresponding memory number ( 0 to 49 ) will be displayed for a short time. How the saved values are displayed or erased will be described in point 9.1 and 9.2.
9. Description of the menu
You can enter the menu by pressing the "SET"-key in measuring mode. Press the
"SET"-key repeatedly until the item you want to select is displayed. Activate it
by pressing the "ENTER"-key. If you choose "BACK", you will leave the
menu and enter the measuring mode again.
In some menu points you are to enter a number. The description of the value is displayed
in the first line and the number is displayed in the second line. In the last line there
is a small menu for increasing/decreasing the value or leaving this menu. This menu can be
used similar to the menu described above with the "SET" and
"ENTER"-key.
9.1. Deleting values
Choose the menu point "Delete values" and all values will be deleted.
WARNING: If values are deleted there is no way to bring them back.
Here are the saved values displayed in the first 3 lines. In the last line there is a small menu, where you can select the values or delete them. This menu can be used similar like in point 9 with the "SET" and "ENTER"-keys.
For saving the battery the OxyScan turns itself off after a defined time. This time can
be changed in the menu point "Auto power off". If it should never switch off
choose 0 minutes.
If the battery voltage is below a minimum value ( about 7 V ) the auto power off is
automatically set to 30 seconds and a warning "LowBat" is displayed instead of
the diagram.
The value for NTC-correction depends on the sensor used and is normally set for the sensor delivered with the OxyScan unit. This value is normally not to be changed by the user.
To enable an accurate calibration and %sat display the actual air pressure must be entered.
The calibration end value is the value the instrument is calibrated for. If calibration is done with the calibration chamber at room temperature it bust be set to 102.3 %sat. Change this value if other calibration methods are used.
Shows the serial number of the device and the sensor and the firmware version number.
10. Sensor storage
The oxygen sensor will be delivered in the calibration chamber. It is very important
that the calibration chamber is always kept damp. ( look at point 5
"Calibration" ).
If you can not ensure checking the calibration chamber regularly store the sensor in an
other vessel filled with water. The sensor tip must always be in water.
11. Additional functions / Firmware update
Depending on the additional options you have chosen the microprocessor device can be
equipped with additional functions not listed in this manual. This functions will be
described on an extra sheet.
Your OxyScan light can be equipped with further functions. Because of the used
microcontroller technology we can realise many special wishes. Simply ask us!
All functions of the device are controlled by a microcontroller. On this microcontroller
runs a program developed by us. This program ( = firmware ) is saved in a memory module
that should be replaced only by us or other authorised people.
The firmware is tested very carefully by us. Nevertheless we improve this firmware
permanently. If you want to get an updated version call us and tell us your current
version number ( look at 9.6. "device information" ). We will inform you what
additional functions the new firmware will make possible.
12. Function of the sensor
The oxygen sensor functions according the Clark Principle. It measures the oxygen
dissolved in the water. The oxygen diffuses through a membrane at the sensor tip and is
reduced at the cathode. The electrons generated at the anode lead to an very low electric
current, which is electronically monitored by the unit.
However, the current in the sensor is not only determined by the water’s oxygen
content, but also by the temperature of the water and the air pressure. To compensate
these factors the measuring unit is equipped with automatic temperature and air pressure
compensations.
13. Liability and warranty
Technical changes are reserved!
We undertake no liability whatsoever for damages arising from misuse and erroneous
application.
The entire measurement system carries a legal warranty of 6 months.
On claims under the warranty please return both the sensor and measuring unit.
14. Technical specifications
Measuring ranges
concentration range: 0.0 – 19.99 mg/l
resolution: 0.01 mg/l
accuracy: ± 0.1 mg/l
saturation range: 0.0 – 199.9 %sat
resolution: 0.1 %sat
accuracy: ± 0.5%
temperature range: 0.0 – 50.0 °C
resolution: 0.1 K
accuracy: 0.5 K
temperature compensation automatically, range: 0 - 50 °C
air pressure compensation manual input, automatic calculation
environmental temperature 0°C - 70°C (measuring device)
display graphic-capable LCD 120 x 32 points
electrode Pt-cathode, Ag-anode
power supply 9 V – battery / 8,2 V accumulator
dimensions device 151 x 82 x 33 (l x w x h, mm)
dimensions sensor 150 x 14,5 (L x Æ, mm)
weight device about 295 g (inclusive battery)
weight sensor about 128 g (inclusive cable)
polarisation voltage 750 mV
polarisation time max. 5 min
sensor reaction time approx. 30s
The lifespan of the electrode is about 2 years. Because the sensor is miniaturised it can not be regenerated by the user. This eliminates a number of error sources which result from the regeneration process.
5. Appendix
(The following tables are only valid under the mentioned conditions!)
Oxygen content in deionised water
in relation to temperature under normal pressure (1031 hPa = 760 Torr)
Maximum dissolved oxygen in freshwater
in mg/l at various temperatures and under normal pressure (1013 hPa = 760 Torr)
°C |
mg/l |
°C |
mg/l |
°C |
mg/l |
°C |
mg/l |
0 |
14.64 |
10 |
11.25 |
20 |
9.08 |
30 |
7.55 |
1 |
14.23 |
11 |
10.99 |
21 |
8.90 |
31 |
7.42 |
2 |
13.83 |
12 |
10.75 |
22 |
8.73 |
32 |
7.30 |
3 |
13.45 |
13 |
10.51 |
23 |
8.57 |
33 |
7.18 |
4 |
13.09 |
14 |
10.28 |
24 |
8.41 |
34 |
7.06 |
5 |
12.75 |
15 |
10.06 |
25 |
8.25 |
35 |
6.94 |
6 |
12.42 |
16 |
9.85 |
26 |
8.11 |
36 |
6.83 |
7 |
12.11 |
17 |
9.64 |
27 |
7.96 |
37 |
6.72 |
8 |
11.81 |
18 |
9.45 |
28 |
7.82 |
38 |
6.61 |
9 |
11.53 |
19 |
9.26 |
29 |
7.69 |
39 |
6.51 |
10 |
11.25 |
20 |
9.08 |
30 |
7.55 |
40 |
6.41 |
Oxygen content in seawater
in relation to salt content (density) and temperature
under normal pressure (1013 hPa = 760 Torr)
density in g/cm3 |
10°C O2 in mg/l |
15°C O2 in mg/l |
20°C O2 in mg/l |
25°C O2 in mg/l |
30°C O2 in mg/l |
1.000 |
11.25 |
10.06 |
9.09 |
8.26 |
7.49 |
1.005 |
10.81 |
9.69 |
8.76 |
7.96 |
7.21 |
1.010 |
10.38 |
9.32 |
8.44 |
7.65 |
6.93 |
1.015 |
9.94 |
8.95 |
8.11 |
7.35 |
6.65 |
1.020 |
9.51 |
8.58 |
7.79 |
7.05 |
6.38 |
1.025 |
9.07 |
8.21 |
7.46 |
6.74 |
6.10 |
1.030 |
8.64 |
7.85 |
7.14 |
6.44 |
5.82 |
Salt content (salinity in g/l = ‰) of seawater
in relation to temperature an density of seawater
density in g/cm3 |
10°C salinity ‰ |
15°C salinity ‰ |
20°C salinity ‰ |
25°C salinity ‰ |
30°C salinity ‰ |
1.000 |
0 |
0 |
0 |
0 |
0 |
1.005 |
6.7 |
7.5 |
8.5 |
10.8 |
13.1 |
1.010 |
13.2 |
14.4 |
15.6 |
17.2 |
18.8 |
1.015 |
19.6 |
20.9 |
22.1 |
23.6 |
25.1 |
1.020 |
26.0 |
27.3 |
28.6 |
30.6 |
32.6 |
1.025 |
32.5 |
33.9 |
35.3 |
37.1 |
38.9 |
1.030 |
38.8 |
40.4 |
42.0 |
44.2 |
46.4 |
For technical queries and orders of accessories please contact:
AquaTech
Unterbrunnweg 3, A-6370 Kitzbühel/Austria
Tel: +43/5356-71399, Fax: +43/5356-64870
http://www.aquatech.8m.com