Ofs udox User manual

µdox
Operating instructions
Version 1.6.8

3
Table of contents
1. Manufacturer................................................................................................................4
2. Overview......................................................................................................................4
3. Guarantee .....................................................................................................................4
4. Liability........................................................................................................................4
5. License conditions........................................................................................................4
6. General safety instructions...........................................................................................4
7. LAB-Pocket meter case ...............................................................................................6
8. Device description........................................................................................................7
9. Initial set up / operation ...............................................................................................7
10. Operation......................................................................................................................7
10.1 Operating elements and connections............................................................................7
10.1.1. Key pad ........................................................................................................................7
10.1.2. Display.........................................................................................................................8
10.1.3. Status information hand-held meter.............................................................................9
10.1.4. Socket panel.................................................................................................................9
10.2 Switch on the hand-held meter.....................................................................................9
10.3 Switch off the hand-held meter..................................................................................10
10.4 Navigation / Program guides......................................................................................10
11. Calibration..................................................................................................................10
11.1. Temperature pH / O2 .................................................................................................11
11.2. pH value.....................................................................................................................12
11.3. Oxygen value .............................................................................................................13
12. Special functions........................................................................................................14
12.1. Determination acid capacity.......................................................................................14
12.2. Determination total hardness .....................................................................................16
13. Sensor information.....................................................................................................17
14. Measurement sites / measurement data......................................................................17
15. Measurement units.....................................................................................................20
16. Options.......................................................................................................................22
17. About us.....................................................................................................................23
18. Maintenance / Cleaning / Storage..............................................................................23
19. Error messages...........................................................................................................23
20. Explanations in other languages - abbreviated version..............................................24
21. Scope of delivery .......................................................................................................25
22. Technical data ............................................................................................................26

4
1. Manufacturer
OFS Online Fluid Sensoric GmbH
Company for analytical and measurement technology systems
Heidelbergweg 9
07580 Ronneburg
Germany
Telephone: [phone]
Fax: [phone]
[email protected]
www.water-monitoring.com
2. Overview
The µdox multi-parameter hand-held meter is used to measure the water values pH, redox, total
hardness, acid capacity, and dissolved oxygen. The tests must correspond to the chemical and
physical directives in the chapter “Technical data”.
3. Guarantee
The manufacturer guarantees the µdox hand-held meter for a period of 6 months.
This excludes the sensors and accessories for the meter case LAB-Pocket.
This guarantee will become void in the event of:
improper or unauthorised intervention in the devices or components
effects of shock or impact
improper analytical, mechanical or electrical effects of any kind or type
4. Liability
The manufacturer accepts no liability for the correctness of measurements.
This exclusion of liability is based on the fact that measured results depend on the user’s manual
calibrations.
5. License conditions
On purchase of this device, the user receives an exclusive, non-transferable right to use the
software installed by the manufacturer. Use is authorised exclusively for operation of the device
purchased. Unlawful use, transfer, copying or re-compilation of the software is nor permitted.
The same conditions apply to software updates purchased.
6. General safety instructions
Safety instructions in the operating instructions
These operating instructions contain important notes and information for safe handling of the
µdox hand-held meter. In the interests of safe handling of the device, these instructions must be
strictly observed. Always keep the operating instructions in the meter case LAB pocket for
reference if necessary.

5
Safety instructions
Handling the reactants delivered.
Protective measures for safe handling.
No special measures are required if handled properly.
In use:
Avoid direct contact with the mucous membrane, eyes or the skin.
When not in use:
All solutions and the sodium sulphite should always be tightly closed
General notes:
Wash any clothes contaminated by chemicals with water as normal.
After inhalation:
Supply fresh air; consult a doctor if health issues arise.
After skin contact:
Wash off with water; consult a doctor if health issues arise.
After eye contact:
Rinse the eyes carefully with running water with the eyelids held open.
Consult a doctor if health issues arise.
After ingestion:
Rinse out the mouth and drink a glass of water. Do not induce vomiting.
Consult a doctor if health issues arise.
Notes on combined storage:
Store away from foodstuffs
Recommended storage temperature: 15 - 25 °C
Intended use of the hand-held meter
The exclusive, intended use of the hand-held meter is measuring pH, redox, dissolved oxygen,
total hardness and acid capacity in water solutions, and also measuring oxygen content in gases.
Any other use does not count as intended use.
Conditions for safe operation
The hand-held meter may only be used in accordance with its intended use.
The hand-held meter may only be used in the absence of any unapproved mechanical,
thermal or electrical influences.
The hand-held meter may only be powered by or connected to the energy sources
stated in the operating instructions (See the chapter “Initial setup”)
The hand-held meter may only be used in the environmental conditions stated in the
operating instructions (see chapter “Technical data”).
Unauthorised operation
The hand-held meter may not be used when:
The sensors are stored or used outside the authorised temperature range between 5°C
and 50°C.
The sensors or the hand-held meter are exposed to temperature or pressure fluctua-
tions.

6
7. LAB-Pocket meter case
The LAB-Pocket meter case consists of the µdox hand-held meter including sensors, the oper-
ating instructions and accessories.
1
µdox hand-held meter
2
Operating instructions
3
USB sensor cable and communications cable for the µdox hand-held meter
4
Distillate spray bottle for rinsing and cleaning the sensors
5
pH buffer 9.18
6
pH buffer 7.00
7
Sodium sulphite
8
Syringe and tubes
9
Replacement sensor vial.
10
Sensor(s) with sensor vials and 1m cable
11
USB power supply unit for µdox hand-held meter
12
Reagent solution RM A and RM B incl. replacement bottle
13
Pipette
14
Double spatula
2
8
7
5
6
4
3
1
12
11
13
14
10
9

7
8. Device description
The µdox multi-parameter hand-held meter gives precise, reliable measurement of the water
values pH, redox, total hardness, acid capacity, and dissolved oxygen, even at trace levels. The
µdox unit is characterised by ease of operation combined with high-quality measurement stand-
ards.
Only OFS sensors can be connected to the µdox hand-held meter.
The LAB-Pocket meter case is part of the equipment, as well as the hand-held meter and sen-
sors.
9. Initial set up / operation
For initial set up, the sensor cables should be inserted into the sensor sockets (2) as per the
diagram in the chapter “Socket panel”, and tightened using the screw connector.
One or two sensors can be connected, whereby the choice of sensors sockets (2) is free.
Switch the hand-held meter on using the key pad [ON/OFF] and check charge status (11) of the
integrated battery in the display (see chapter “Display) top right.
If the charge status of the battery falls below 30%, the USB sensor cable must be connected to
the charging socket (1) in the socket panel. The USB sensor cable must then be connected to a
PC or a USB power supply unit to charge the battery. The remaining battery time is shown
optically in percent (%) via the battery symbol (11).
10. Operation
10.1 Operating elements and connections
10.1.1. Key pad
In the operating instructions, keys are indicated using square brackets [ … ], for example [OK].
Socket panel
Display
Key pad

8
[ON/OFF]
Switch the hand-held meter on/off
[MENU]
Open the menu for measurement / system settings
[▲] / [▼]
Menu control.
increase / lower values
[◄]
Leave the menu for measurement / system settings
Cancel measurement/calibration
[OK]
Open the menu for measurement / system settings
Confirm input
10.1.2. Display
Example description of display output:
1
Connected sensor, upper half of display pH.
lower half O2 sensor
7
8a
Unit of oxygen value
Transient mode for pH sensor
2
Sensor temperature value
8b
Transient mode for O2 sensor
3
4
pH value recorded
Redox potential recorded
9
Current measurement location and
available data memory capacity
5
Salinity set and air pressure recorded
10
Time and date
6
Unit set for oxygen concentration
11
Battery capacity available in %
▼
▲
2
2
3
4
6
7
9
10
11
13:22:43 12/09/2017
active measuring point: 1
free memory: 96.6%
O2 Sensor
23.8 °C
SA=0.0 P=971.3 mbar
7.06
mg/l
▼
▲
pH redox
22.9 °C
7.67
175.82 mV
1
1
5
8b
▼
▲
8a
81 %

9
10.1.3. Status information hand-held meter
Charging status
When the charging status is flashing, the battery is fully-
charged. In this picture, there is still 100% battery capacity
available
▼
__
▲
Transient mode - measurement value unstable
The distance between the arrows shows that the measurement
value is not stable yet. The value measured should not be used
yet.
▼
▲
Transient mode - measurement value stabilising
Once the arrows meet in the middle, the measured value is as
stable as possible.
CAUTION: Drift may still arise over time !!!
Number values on the display should be noted.
Calibrate the sensor
Reminder
3 x flashes after switching on the device remind you that the
last calibration took place over 30 days ago.
This display only acts as a note and reminder.
It has no influence on other measurements.
10.1.4. Socket panel
1Socket for USB sensor cable for charging the battery and for data transfer
2Sockets for connecting the sensors.
There is no fixed assignment of the two sockets for the sensors.
Connection for the sensors supplied can be chosen freely.
10.2 Switch on the hand-held meter
Switch on the device using [ON/OFF]. Then the OFS logo and the software version number
are shown briefly on the display. Then comes the measurement view in the main menu.
1
2
2
100%

10
10.3 Switch off the hand-held meter
Display illumination
If a key is not pressed for two minutes, the hand-held meter reduces display brightness to protect
battery life. The illumination switches back on the next time any key is pressed.
If a key is not pressed for five minutes, the hand-held meter switches off automatically.
The device can be switched on or off manually at any time using [ON/OFF].
10.4 Navigation / Program guides
In the measurement view, use [MENU] to open the sub-menus for sensor-dependent and sen-
sor-independent settings.
Use [▲] or [▼] to toggle between calibration analysis and measurement setting. Use [OK] to
open the sub-menu and go to more functions.
Use [◄] to leave the current setting and go back to the sub-menu. Current calibrations or meas-
urements can be aborted at any time.
11. Calibration
Why is calibration necessary?
Because sensors age and change their behaviour. This leads to imprecise measurements. Cali-
bration continuously updates the internal behaviour parameters. Precise calibration as per the
directives is important. Aged or mixed calibration solution or unstable measured values cali-
brate a sensor wrongly, which makes subsequent measurements faulty.
When should calibration be done?
When analysing water with very large, different ionic strengths
The calibration interval of 30 days has expired.
As the need to calibrate a sensor depends on a number of conditions, the user is reminded to re-
calibrate by the text “Calibrate sensor” flashing 3 x in the main menu after switching on 30
days after the last calibration of the µdox hand-held meter.
This display is only intended as a note and reminder.
Main menu
calibration
special functions
sensor information
measurement sites/data
measurement units
options
about us
[OK]
[OK]
[▲]
or
[▼]

11
How can faulty calibration be resolved?
Faulty calibration can only be resolved by a precise re-calibration. Where the conditions for
precise calibration are lacking, this can be mitigated by a reset to factory settings. This function
gives the user the option to reset the sensors to their initial position, however, this will not
correspond to the current behaviour status of the sensors.
Open the sub-menu “Calibration” with [MENU] and press [OK].
The relevant temperature value can be calibrated on the sensors for oxygen and pH. Please bear
in mind that the normal comparative value used must have a very high quality of <0.1 °C, and
the sensor must be exposed to a very constant temperature for 10 minutes. To avoid extreme
changes, the temperature range can only be changed by ± 1°C.
11.1. Temperature pH / O2
The calibration can be aborted at any time using
the [◄] key.
1. Open the menu selection using [MENU].
2. Use [▲]or [▼] for calibration and confirm with [OK].
3. Use [▲]or [▼] to change to “temperature” of the
selected sensor and confirm with [OK].
4. “actual temperature” and “target temperature” are
shown. Use [▲]or [▼] to select the desired tempera-
ture and confirm with [OK].
[OK]
[OK]
Temperature calibration of the
pH sensor 1430817000
actual temperature
25.1 °C
target temperature
25.1 °C
modif. possible by ± 1 °C
raise the value with ▲
lower the value with ▼
save with button [OK]
interrupt with button [◄]
Main menu
calibration
pH redox sensor
pH redox value
temperature
oxygen sensor
oxygen value
temperature
Main menu
calibration
temperature
[▲]
or
[▼]

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11.2. pH value
Please use the buffer solutions in ascending order.
The calibration can be aborted at any time using the [◄] key.
1. Open the menu selection using [MENU].
2. Use [▲]or [▼] for calibration and confirm with [OK].
3. Use [▲]or [▼] to change to “pH value” or “pH redox value”
of the selected sensor and confirm with [OK].
4. After cleaning with distilled water, dip the pH sensor in buffer 1.
Note: 20 ml in sensor vial. Confirm with [OK].
Calibration of the
pH sensor 1430817000
_________________________________________
measurement process: buffer 1
measurement completed
buffer 1
--- [ 7.00 ] ---
confirm buffer
with [OK]
change buffer
with [▲]
Main menu
calibration
pH redox value

13
5. Measurement process: buffer 1 will be
measured. (duration: 60 seconds). Confirm
result with [OK] or select the desired buffer
value with [▲]or [▼].
6. Clean the pH sensor with distilled water
7. After cleaning with distilled water, dip the
pH sensor in buffer 2.
Note: 20 ml in sensor vial.
Confirm with [OK].
8. Measurement process: buffer 2 will be
measured (duration: 60 seconds).
Confirm result with [OK] or select the de-
sired buffer value with [▲]or [▼].
9. Display the calibration result for buffer 1 and buffer 2.
Confirm result with [OK].
10. Calibration data was saved successfully. Go back to menu selection with [OK].
11.3. Oxygen value
The calibration can be aborted at any time using
the [◄] key.
1. Open the menu selection using [MENU].
2. Confirm calibration with [OK].
3. Use [▲]or [▼] to change to “oxygen value” of the se-
lected sensor and confirm with [OK].
4. Dip the oxygen sensor in the air-saturated drinking water solution. I.e: pour the solution into
the sensor vial, insert the sensor, turn to fasten and shake well. Start the measurement process
with [OK].
5. Measurement process: The sample is measured (duration: 60 seconds).
Calibration of the
pH sensor 1430817000
_________________________________________
Measurement process: buffer 2
Measurement completed
buffer 2
--- [ 9.18 ] ---
confirm buffer
with [OK]
change buffer
with [▲]
Main menu
calibration
oxygen value

14
6. Dip the oxygen sensor in the sulphite solution. I.e: put
approx 0.5g of sodium sulphite (full narrow spatula part)
into the solution using the spatula, insert the sensor, turn to
fasten and shake. Start the measurement process with
[OK].
7. Measurement process: The sample is measured
(duration: 150 seconds).
8. Display the calibration result with indication of steep-
ness. Confirm result with [OK].
9. Calibration data was saved successfully. Go back to
menu selection with [OK].
12. Special functions
The µdox hand-held meter gives you the option to determine acid capacity and total hardness.
These measurements demand very precise work.
The following comments should be considered when carrying out measurements:
The sample bottles and the sensors must be completely clean and free from remains of
any previous samples. We recommend cleaning the sensors and sensor vials with dis-
tilled water after contact with a liquid.
The volumes and mixing ratios must be followed precisely.
Reagent solutions must always be shaken before use.
The measurement should only start when there is 20 ml of the sample in the sensor vial
and the sensor is fully inserted in the sensor vial.
Before starting measurement, we recommend rinsing at least 1 x with the water to be
analysed, in order to avoid sample carry over.
After addition of the reagent, the sensor and sensor vial should be shaken slowlyseveral
times.
If these conditions and process are followed, you can achieve very precise results.
12.1. Determination acid capacity
The measurement can be aborted at any time using the [◄] key.
1. Open the menu selection using [MENU].
2. Confirm “special functions” with [OK].
3. Use [▲]or [▼] to change to “determination acidity capac-
ity” of the selected sensor and confirm with [OK].
Main menu
special functions
determination
acidity capacity

15
4. Put 20 ml of the sample in the sensor.
Dip the pH sensor in the water sample.
Start the measurement process with
[OK].
5. Measurement process: The sample is
measured
(duration: 60 seconds)
6. Confirm measurement with [OK].
7. Add 0.1 ml RM A. Insert the sensor in the sensor
vial, shake slowly several times. Start the measure-
ment process with [OK].
8. Measurement process: The sample is measured
(duration: 60 seconds).
9. Confirm measurement with [OK].
10. Display of oxygen capacity.
Confirm measurement with [OK].
pH value 21.3 °C
7.51
______________________________
The water sample is measured
Please wait!
60 sec
Confirm measurement with
[OK].
cancel [◄]
pH value RM A 21.3 °C
6,27
______________________________
The water sample is measured
Please wait!
60 sec
Confirm measurement with
[OK].
cancel [◄]

16
12.2. Determination total hardness
The measurement can be aborted at any time using the [◄] key.
1. Open the menu selection using [MENU].
2. Confirm “special functions” with [OK].
3. Use [▲]or [▼] to change to “determination total hardness”
of the selected sensor and confirm with [OK].
4. Put 20 ml of the sample in the sensor.
Dip the pH sensor in the water sample.
Start the measurement process with
[OK].
5. Measurement process: The sample is
measured (duration: 60 seconds).
6. Confirm measurement with [OK].
7. Add 0.4 ml RM B. Insert the sensor in the sensor
vial, shake slowly several times. Start the measure-
ment process with [OK].
8. Measurement process: The sample is measured
(Duration: 60 seconds).
9. Confirm measurement with [OK].
10. Display total hardness.
Confirm measurement with [OK].
pH value 21.3 °C
7.51
______________________________
The water sample is measured
Please wait!
60 sec
Confirm measurement with
[OK].
Cancel [◄]
pH value RM B 21.3 °C
6,27
______________________________
The water sample is measured
Please wait!
60 sec
Confirm measurement with
[OK].
Cancel [◄]
Main menu
special functions
determination
total hardness

17
13. Sensor information
Open the menu selection with [MENU] and use [▲]or [▼] to go to
“Sensor information”. Confirm with [OK].
The following information is shown (if redox in addition):
pH / pH Redox
sensor no: 1430817000
calibration: 01/05/2017
calibration interval: 30 days
Oxygen
sensor no: 0400817001
calibration: 11/08/2017
calibration interval: 30 days
The µdox hand-held meter gives the following information for the connected sensors:
Sensor number
Every sensor has its own unique sensor allocated by the manufacturer. The µdox hand-held
meter recognises the sensor automatically once it is connected to the device.
Calibration
The date of the last successfully completed calibration of the sensor is shown. The date is dis-
played in the sequence day - month - year [DD:MM:YY]. The order of the time units is fixed.
Calibration interval
The manufacturer recommends calibrating the sensor every 30 days. This time interval is fixed.
You will find more information about calibration in the chapter “Calibration”.
14. Measurement sites / measurement data
Determining and changing measurement sites
Open the menu selection with [MENU] and use [▲] or [▼] to
go to the sub-menu “Measurement sites/measurement data”.
Confirm with [OK].
The current measurement site where the measurement data is
stored is shown. In the example “active measurement point 1”.
Change the measurement point with [▲] or [▼] to „1“ and
confirm with [OK]. The number is left in blue. The measure-
ment point can be varied using [▲] or [▼]. A total of eight
measurement points are available. The amended measurement
point is set by confirming with [OK].
active measurement point
1
display data
delete data
Main menu
sensor information
Main menu
measurement
sites/data

18
Saving measurement data
There are two options for saving measured data:
Main menu
The current data is saved by activating [OK]
The measurement data is saved in the active measurement site in the
main display with date and time.
Special functions
Successfully completed measurements of total hardness and acid capac-
ity.
These measurements are also confirmed with [OK], then assigned and
stored to the active measurement point.
Display measurement data
Open the menu selection with [MENU] and use [▲]or [▼] to go to the sub-menu “measure-
ment sites/measurement data”. Confirm with [OK].
To show measurement points use [▲] or [▼] to “display data”
and confirm with [OK]
The measurement data for the selected measurement site is
shown by time, in ascending order. The current measurement
site and total measurement sites are shown in the uppermost
line. In the example “1/17”, i.e. measurement point 1 of 17.
Explanation of further values in the example:
Sensor type pH (or pH redox, oxygen sensor as selected)
Serial number: 1430817000 (pH-Sensor)
pH: pH value 6.99
R: Redox value 196.79 mV
O2: Oxygen value 7.09 mg/l
T: Temperature 23.3 °C
P: Air pressure 977.74 mbar
SA: Salinity 0.0 psu
Other examples:
ANC: Acid capacity, KS 8.2 (p) 0.00 ppm
GH: general hardness 830.65 ppm
active measurement point
1
display data
delete data
Measurement data - 1/17
11:08:41 15/09/2017
pH 1430817000
pH: 6.99
R: 196.79 mV
T: 23.3 °C
14:31:09 20/09/2017
O2 Sensor 0400817001
O2: 7.09 mg/l
P: 977,74 mbar
T: 24.2 °C
SA: 0.0 psu
Measurement data - 1/17
14:26:53 25/09/2017
acid capacity
ANC 8.2 (p) 0.00 ppm
ANC 4.3 (m) 786.21 ppm
13:45:04 27/09/2017
total hardness
GH: 830.65 ppm

19
Transferring measurement data
Connect the USB sensor cable (1) in each case to the µdox hand-held meter and the USB con-
nection of the electronic device, such as a PC or tablet.
The data is transferred as text files. It is possible to copy the data, for example into Excel.
1Socket for USB sensor cable for charging the battery and for data transfer
2Sockets for connecting the sensors
Delete measurement data
Open the menu selection with [MENU] and use [▲]or [▼] to go to the sub-menu “measure-
ment sites/measurement data”. Confirm with [OK].
Navigate using [▲]or [▼]to the function “delete data” and
confirm with [OK].
The query “Confirm deleting of data”is displayed.
When you confirm with [OK], all data for the selected meas-
urement point is completely deleted.
The command “delete data” can be cancelled using the [◄]
key.
1
2
2
active measurement point
1
display data
delete data
active measurement point
1
display data
confirm deleting of data
confirm with button [OK]
interrupt with button [◄]

20
15. Measurement units
Open the menu selection with [MENU] and use [▲]or [▼] to go to the sub-menu “measure-
ment units”. Confirm with [OK].
The units of measure for temperature, oxygen, water hardness and salinity can be adjusted. The
units of measure shown in the example are those currently selected as active units of measure
on the hand-held meter.
Navigate using [▲]or [▼] to the unit of measure which is highlighted in black to select and
change the unit of measure. This change is confirmed by hitting the [OK] key, and highlights
the text to be changed in blue. Press [▲]or [▼] to change the unit of measure selected and
confirm with [OK].
Then the unit of measure is highlighted in black again.
Unit of measure options for temperature
Temperature can be shown either in degrees Celsius [°C], Kelvin [K] or Fahrenheit [F].
Degrees Celsius
Kelvin
Fahrenheit
1 °C
274.15 K
33.8 F
Unit of measure options for oxygen
Oxygen values can either be shown in µg/l | mg/l, ppb | ppm, % or % Vol.
µg/l | mg/l
ppb | ppm
1
1
Percentages [%] are calculated as the ratio of the oxygen recorded in a water solution to the
maximum oxygen concentration in the solution at the current temperature and the same air
pressure and salinity.
Example:
In a water solution, 3.56 mg/l of oxygen was recorded at 30 °C, whereby at 30 °C, with the
same air pressure, temperature and salinity, it can have a maximum 6.89 mg/l.
This means: 3.56 mg/l / 6.89 mg/l = 51.6 %
[OK]
[OK]
[▲]
or
[▼]
Main menu
measurement units
temperature °C
oxygen µg/l | mg/l
water hardness ppm
salinity [psu] 0
[▲]
or
[▼]