OxyScan

Graphic

UMS Oxygen Sensor 501^®
Microprocessor instrument

Users Manual

Introduction

Thank you for choosing the UMS Micro Oxygen Sensor 501^®!
With the UMS Micro Oxygen Sensor 501^® 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 supplied
  2. Handling instructions
  3. Explanation of operation
  4. Operation
  5. Calibration
  6. Measurement
  7. Description of the display in measuring mode
  8. Description of the menu
  9. Sensor storage
10. Additional functions / Firmware update
11. Function of the sensor
12. Liability and warranty
13. Technical specifications
14. Appendix

1. Components supplied

- measuring unit
- micro oxygen sensor
- calibration chamber
- power supply for charging the integrated accumulator
- transport case
- this manual

Carefully unpack the components and check that everything is present.

2. Handling instructions

The heart of the oxygen sensor is the highly sensitive sensor tip.
When the sensor tip of the oxygen electrode 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.
If there are any problems, please contact us.

3. Explanation of operation

1 On / Off - switch
2 Calibration key
3 Menu/Enter: for confirmation of choice or entering menu
4 "Up": key for choosing up in the menu
5 "Down": key for choosing down in the menu
6 F - Key: only for customer-specific options, if need look at additions sheet

4. Operation

On top of the measuring unit are the connectors

- for the sensor ( connector in the middle - 5 pins ),
- for the power supply/charger ( left connector – 7 pins )

Connect the plug of the sensor with the connector of the measuring unit (connector in the middle - 5 pins).
For charging the integrated accumulators connect the power supply with the charging connector top left of the measuring unit. The charging circuit stops charging automatically if the accumulator has reached it’s full capacity. We recommend switching off the unit while charging. The power supply can stay connected to keep the accumulator fully charged.
If the red LED on the keyboard is on, the accumulator will be charged. If it is ready the LED will blink.

5. Calibration

For calibrating put the sensor into the calibration chamber and press the "CAL."-key on the measuring unit. The calibration runs automatically and stops when the calibration value is stable. On the bottom end of the calibration chamber there is a black plug containing a sponge. This sponge must be kept damp approximately every 4 weeks as follows:

remove the black plug
dampen sponge with distilled water
close the calibration chamber
after about 15 minutes calibration can begin

The sensor should be stored into the calibration chamber. The sponge must be damp at all tries.

Hint:
Your oxygen measurement system is an highly innovative product. Your contribution for exact measuring is the calibration of the system.
Frequent calibration increases accuracy of measurement! 

6. Measurement

After calibrating the measurement system, measurement of the media can begin.

Hint:
You should place the sensor tip in middle depth of the vessel ( minimum 5 cm below the surface).
The sensor need 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: air pressure in hPa
  5: diagram shows state of the integrated accumulator ( 0-100 % )
  6: diagram of the last 30 values measured in % saturation ( 0-160 %sat )
  7: diagram of the last 30 values measured in mg/l ( 0-16 mg/l )
  8: diagram of the last 30 temperature values measured ( 0-48 °C )
  9: diagram shows state of measurement memory ( 0-5000 values )
10: actual time

8. Description of the menu

You can enter the menu by pressing "MENU/ENTER"-key. Then you can select submenus described in the next sections.
To select a submenu use "Up"- or "Down"- keys and then press the "MENU/ENTER"-key to enter it.
If you select "BACK" in the menu you will go back to the measuring mode. The selection in the submenus works similarly like this.

8.1. Settings

In this menu you can make the following selections:

Set time: Set time as follows:

1. Move cursor with the arrow keys to the number to set
2. press „MENU/ENTER"
3. Change the number with arrow keys
4. press „MENU/ENTER"
5. go back to point 1 or select "BACK" and press "MENU/ENTER"

NTC-correction: Set temperature correction value with the arrow keys and press "MENU/ENTER". This value should not to be changed by the user.

Press.-correct.: Set air pressure correction value with the arrow keys and press "MENU/ENTER". This value is should not to be changed by the user.

Cal. End value: Set calibration end value with arrow keys and press "MENU/ENTER". Change this value only when an other calibration method is used. ( Standard value is 102.3 %sat )

Auto power off: Set the auto-power-off time with the arrow keys and press "MENU/ENTER". If there is no key pressed for the time adjusted here the device will switch off automatically. If you set the time to 0 the device will not switch off automatically.

Set language: You can switch between German and English display text. This manual refers to English texts.

Device information: Shows information about the device: serial numbers of device and sensor, Firmware version and some information for service and diagnostics use.

Hints:
The values for NTC-correction depends on the sensor and is set in our company. This value is normally only to be changed if the sensor is replaced.
The value for pressure correction should never be changed under normal circumstances.

8.2. Log functions

Select this submenu for data logging.
In this menu you can make the following selections:

Set interval: Set the time between logging single values.

Start log now: Starts logging immediately.

Set start time: Set the time the logging starts. Setting this time should be done like "set time" described in section 7.1.

Stop logging: Logging will be stopped.

The last 3 entries will only be shown if convenient. (e.g. "Stop logging" will only be shown if there is any logging running).

Hint:
Data logging will also be continued if the device is switched off. Please note the higher power consumption and shorter running time. The shorter the interval is set, the faster the accumulator will discharge. At all selectable intervals a full accumulator will be sufficient for filling the measurement memory completely.

8.3. Values

Select this submenu for watching or transmitting the logged values.
In this menu you can make the following selections:

Show values: The logged values will be shown as numbers. Use the arrow keys to select a value. Press "MENU/ENTER" for changing this mode.

Show Diagram: The logged values will be shown in a diagram. Select the value that the user requires.

Send values: The logged values will be sent by the infrared transceiver. See section 8.3.1 for details.

Delete values: All values will be deleted. ( only shown if there are values logged )

8.3.1. Data transmission

The OxyScan graphic can send data via it’s infrared interface to a PC or printer which must meet the following specifications:

19,2 kBps, 8 Databits, no Parity, 1 Stop bit ( = "8N1" ), 3/16 IR modulation

The optional infrared-adapter enables the sending of measured values to devices not meeting this specifications which have a standard RS232 interface like most PC’s and some printers.
The data are sent as table in text format, so therefor can be easily sent directly to a printer.
For data transmissions to a Windows-PC you can use the terminal software included with most windows-versions. The values are separated by tabulator and the data rows are separated by "NewLine", so they can be imported into most spreadsheet applications (like MS Excel).
Please ensure that no objects are between the OxyScan and the Infrared receiver. If the distance between the devices is longer then 50 cm they must be lined up. If they are exactly lined up distances up to 5 m can be reached.

9. 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 the calibration chamber is not regularly used then store the sensor in an other vessel filled with water. The sensor tip must be always in water.

10. Additional functions / Firmware update

Depending on the options you have chosen the microprocessor device can be equipped with additional functions which are not used in this manual. These functions will be described on a extra sheet.
Your OxyScan graphic can be equipped with further functions. Because microcontroller technology is used we can realise many additional functions. Simply ask us!
All functions of the device are controlled by a microcontroller. On this microcontroller a program developed by us is run. This program ( = firmware ) is saved in a memory module that should only be replaced by us or other authorised persons.
Vigorous tests are carried out on the firmware. Nevertheless updating of the firmware is a continuos process. When an update is needed then call us and tell us your current version number ( look at 8.1. "device information" ). We will then inform you of the new additional functions of the new firmware.

11. 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 waters oxygen content, but also by the temperature of the water and the air pressure. To compensate these factors the measuring unit of the oxygen sensor is equipped with automatic temperature and air pressure compensations.

12. 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. The measuring unit itself is covered by a further 6 months warranty.
On claims under the warranty please return both the sensor and measuring unit.

13. 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
air pressure range: 800 – 1150 mbar
resolution: 1 mbar
accuracy: 10 mbar
temperature compensation automatically, range: 0 - 50 °C
air pressure compensation automatically, range: 800 - 1150 mbar
environmental temperature 0°C - 70°C
(measurement device)
display graphic-capable LCD 128 x 64 Points
electrode Pt-cathode, Ag-anode
power supply integrated accumulator 3,6 V / 2.1 Ah, NiMH
dimensions device 223 x 105 x 40 ( lxwxh, mm )
dimensions sensor 200 x 4.7 ( lxÆ , mm )
weight device approx. 500 g
weight sensor approx. 20 g
polarisation voltage 750 mV
polarisation time 5 min maximum ( 30 sec. 1 % )
sensor reaction time approx. 30 s

The lifespan of the electrode is approximately 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.

14. 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 )

Oxygen content in seawater
in relation to salt content ( density ) and temperature
under normal pressure ( 1013 hPa = 760 Torr )

Salt content ( salinity in g/l = ‰) of seawater
in relation to temperature an density of seawater

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