wtw Oxi 330i Operating Manual
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wtw Oxi 330i Operating Manual

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Operating manual
Handheld meter
Oxi 330i/340i
Oxygen measuring instrument
ba52306e04
03/2008

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  • Page 1 Operating manual Handheld meter Oxi 330i/340i Oxygen measuring instrument ba52306e04 03/2008...
  • Page 2 © Copyright Weilheim 2008, WTW GmbH Reproduction in whole - or even in part - is prohibited without the express writ- ten permission of WTW GmbH, Weilheim. Printed in Germany. ba52306e04 03/2008...

  • Page 3: Table Of Contents

    Oxi 330i/340i List of contents Overview ........5 SETs of equipment .
  • Page 4 List of contents Oxi 330i/340i What to do if........47 Technical data .

  • Page 5: Overview

    Note If you need further information or application notes, you can obtain the follow- ing material from WTW: Application reports Primers Safety datasheets. You will find information on available literature in the WTW catalog or via the Internet. ba52306e04 03/2008...

  • Page 6: Sets Of Equipment

    SETs of equipment The measuring instrument is also available as part of individual SETs of equipment. You will find additional information on this and other accessories in the WTW catalog or via the Internet. Set (sample configuration): Measuring instrument, Oxi 330i/340i Stand –...

  • Page 7: Keypad

    Oxi 330i/340i Overview Keypad RUN/ENTER Key functions Select the measuring mode <M>: – D. O. concentration – D. O. saturation – D. O. partial pressure Save a measured value <STO> Switch measuring instrument on/off <ON/OFF> Calibration; Select the calibration procedure <CAL>...

  • Page 8: Display

    Only connect probes to the measuring instrument that cannot return any volt- ages or currents that are not allowed (> SELV and > current circuit with current limiting). Nearly all probes - especially WTW probes - fulfill these conditions. ba52306e04 03/2008...

  • Page 9: Safety

    Oxi 330i/340i Safety 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 be- fore working with the measuring system. The operating manual must always be available within the vicinity of the measuring system.

  • Page 10: General Safety Instructions

    Safety Oxi 330i/340i General safety instructions This instrument is built and inspected according to the relevant guidelines and norms for electronic measuring instruments (see chapter 7 T ECHNICAL DATA It left the factory in a safe and secure technical condition.

  • Page 11: Commissioning

    Oxi 330i/340i Commissioning Commissioning Scope of delivery Handheld meter, Oxi 330i or 340i Plug-in power supply, optional (340i only) Operating manual and short operating manual 4 batteries, 1.5 V Mignon type AA (in the instrument) Initial commissioning Perform the following activities:...
  • Page 12 7 T ECHNICAL DATA Plug the jack (1) into the socket (2) of the measuring instrument. Connect the original WTW plug-in power supply (3) to an easily ac- cessible mains socket. Note You can also measure without the plug-in power supply. The functions of a connected stirrer, however, can only be used when the plug-in power supply is connected.

  • Page 13: Operation

    Oxi 330i/340i Operation Operation Switching on the measuring instrument Connect the D. O. probe to the measuring instrument. Press the <ON/OFF> key. The display test appears briefly on the display. The relative slope for the probe type that was just connected subse- quently appears for approx.

  • Page 14: Measuring

    Operation Oxi 330i/340i Measuring 4.2.1 General information You can measure the following variables: D. O. concentration D. O. saturation D. O. partial pressure The measuring instrument is supplied with the following functions: AutoRange (automatic measurement range selection), The AutoRead function (drift control) for checking the stability of the mea- surement signal.

  • Page 15: Measuring The D. O. Concentration

    Oxi 330i/340i 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 sec- tion 4.3.3 E...

  • Page 16: Measuring The D. O. Saturation

    Operation Oxi 330i/340i Switch the salt content correction off with <▼ >. The SAL display in- dicator is no longer displayed. 4.2.3 Measuring the D. O. saturation You can measure the D. O. saturation as follows: Perform the preparatory activities according to section 4.2.1.

  • Page 17: Selecting The Measuring Range, Autorange

    Oxi 330i/340i Operation 4.2.5 Selecting the measuring range, AutoRange Sensors You can use the DurOx 325 or CellOx 325 sensors. If the automatic recogni- tion function recognizes the DurOx 325 sensor, the measurement is carried out at a lower resolution. The CellOx 325 sensor measures with a resolution that is a factor of 10 higher.

  • Page 18: Autoread Ar (Drift Control)

    Operation Oxi 330i/340i 4.2.6 AutoRead AR (drift control) The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable effect on the reproducibility of the measured value. Select the measuring mode with <M>. Activate the AutoRead function with <AR>. The current measured value is frozen (hold function).

  • Page 19: Calibrating

    Thus, you should calibrate at regular intervals. Separate The Oxi 330i/340i handheld meter enables the two sensor types, CellOx 325 calibration of and DurOx 325, to be calibrated separately from one another. The calibration CellOx 325 and...
  • Page 20 Operation Oxi 330i/340i Note You can automatically print a calibration protocol after the calibration. To do so, connect a printer to the interface according to section 4.5.3 before cali- brating. After a valid calibration, the record is printed. Sample printout: CALIBRATION PROTOCOL 02.03.99...

  • Page 21: Calibrating With The Air Calibration Vessel

    Oxi 330i/340i Operation 4.3.1 Calibrating with the air calibration vessel Proceed as follows to calibrate the instrument: Connect the D. O. probe to the measuring instrument. Keep an air calibration vessel ready for use. Note The sponge in the air calibration vessel must be moist (not wet). Follow the ®...
  • Page 22 Operation Oxi 330i/340i TDS UpH mV/pH mg/l mbar 1/ cm Time Baud ° Day.Month No. ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Switch to the measuring mode with <M>. Note In chapter 6 W ...

  • Page 23: Calibrating Via A Comparison Measurement

    Oxi 330i/340i Operation 4.3.2 Calibrating via a comparison measurement Proceed as follows to calibrate the instrument: Connect the D. O. probe to the measuring instrument. Press the <CAL> key repeatedly until O FAC appears. Immerse the D. O. probe in the calibrating solution.
  • Page 24 Operation Oxi 330i/340i 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 unit flashes. ba52306e04 03/2008...

  • Page 25: Entering The Salt Content (Salinity)

    Oxi 330i/340i Operation 4.3.3 Entering the salt content (salinity) A salt content correction is required in the oxygen concentration measure- ment of test samples with a salt content of more than 1 g/l. For 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.

  • Page 26: Saving

    Operation Oxi 330i/340i Saving The measuring instrument has an internal data memory. It can store up to 800 data records. A complete data record consists of: Storage location Date/time Measured value Temperature Temperature measuring procedure ID number You can transmit measured values (data records) to the data storage in two...
  • Page 27 Oxi 330i/340i Operation TDS UpH mV/pH mg/l mbar 1/ cm Time Baud ° Day.Month ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Using <▲> <▼>, enter the required ID number (1 ... 999). Confirm with <RUN/ENTER>.

  • Page 28: Saving Automatically

    Operation Oxi 330i/340i 4.4.2 Saving automatically The save interval (Int 1) determines the chronological interval between auto- matic save processes. After the fixed interval has expired, the current data record is transmitted to the storage and to the interface. Setting the save The default setting for the save interval (Int 1) is OFF.
  • Page 29 Oxi 330i/340i Operation As soon as all of the 800 storage locations are occupied, AutoStore is terminated (Int 1 = OFF). If there are not enough storage locations available for your measure- ments: – Output and backup the data storage (see page 30) and –...

  • Page 30: Outputting The Data Storage

    Operation Oxi 330i/340i 4.4.3 Outputting the data storage You can output the contents of the data storage: Stored data on the display Calibration data on the display Stored data on the serial interface (only Oxi 340i) Calibration protocol to the interface (only Oxi 340i) Outputting stored Press the <RCL>...
  • Page 31 Oxi 330i/340i Operation Note If you want to search for a certain element (e.g. date), proceed as follows: Using <RUN/ENTER>, select the element (e.g. date). Press <▲> or <▼> repeatedly until the required date appears on the display. After approx. 2 s the temperature of the displayed measured value appears.
  • Page 32 Operation Oxi 330i/340i Sample printout: Device No.: 99990000 09.03.99 17:10 101.7 % 17.6° Tauto Ident : 09.03.99 17:11 7.11 mbar 17.6° Tauto Ident : 09.03.99 17:12 7.88 mg/l 17.6° Tauto Ident : 09.03.99 17:15 7.11 mg/l 17.8° Tauto SAL = 17.9...
  • Page 33 Oxi 330i/340i Operation Using <M> or <RUN/ENTER>, you can switch back to the measuring mode. Outputting the Press the <RCL> key repeatedly until CAL appears on the display. calibration protocol on the interface (only Oxi 340i) mol/L mV/pH % ppm mg/L °F...

  • Page 34: Clearing The Memory

    Operation Oxi 330i/340i 4.4.4 Clearing the memory With this function, you can delete stored data records. 800 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.

  • Page 35: Transmitting Data (Only Oxi 340I)

    Oxi 330i/340i Operation Transmitting data (only Oxi 340i) You have the following possibilities of transmitting data: One of the following options: – With the AutoStore function (page 28), measured values are periodically saved internally (save interval Int 1) and output on the interface.
  • Page 36 Operation Oxi 330i/340i Setting the The default setting for the interval is OFF. Data transmission To start the data transmission, set an interval (5 s, 10 s, 30 s, 1 min, interval 5 min, 10 min, 15 min, 30 min, 60 min): Press the <RUN/ENTER>...

  • Page 37: Recorder (Analog Output, Oxi 340I)

    Oxi 330i/340i Operation 4.5.2 Recorder (analog output, Oxi 340i) You can transmit data to a recorder via the analog output. Connect the ana- log output to the recorder via the AK323 interface cable. The data output automatically switches to Recorder output.

  • Page 38: Pc/External Printer (Rs 232 Interface, Oxi 340I)

    Operation Oxi 330i/340i 4.5.3 PC/external printer (RS 232 interface, Oxi 340i) 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 inter- face to the instruments.

  • Page 39: Configuration

    Oxi 330i/340i Operation 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...
  • Page 40 Operation Oxi 330i/340i Displaying the air pressure mV/pH % mg/l mbar Baud Time ° Day.Month No. ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Confirm with <RUN/ENTER>. Int 3 appears on the display. Calibration interval...
  • Page 41 Oxi 330i/340i Operation Date and time mV/pH D i s % mg/l mbar 0 9 0 Time Baud ° Day.Month ° Year Ident Tref25 Tref20 AutoCal DIN Auto Store ARng LoBat AutoCal TEC Set the date of the current day with <▲> <▼>.

  • Page 42: Reset

    Operation Oxi 330i/340i Reset You can reset (initialize) the measurement parameters and the configuration parameters separately from one another. Measurement The following measured parameters (O InI) are reset to the default condi- parameters tion: Measuring mode D. O. concentration AutoRange automatic measure-...
  • Page 43 Oxi 330i/340i Operation Using <▲> <▼>, switch between no and YES. YES: Resetting the measuring parameters no: Retaining settings. Confirm with <RUN/ENTER>. The measuring instrument switches to the configuration parameters. Resetting the configuration mV/pH % mg/l parameters mbar Time Baud °...
  • Page 44 Operation Oxi 330i/340i ba52306e04 03/2008...

  • Page 45: Maintenance, Cleaning, Disposal

    Oxi 330i/340i Maintenance, cleaning, disposal Maintenance, cleaning, disposal Maintenance The measuring instrument is almost maintenance-free. The only maintenance task is replacing the batteries. LoBat indicates that the batteries should be changed. The batteries are then largely depleted. Replacing the batteries Open the housing after the instrument has been switched off: –...

  • Page 46: Cleaning

    Maintenance, cleaning, disposal Oxi 330i/340i Note For the maintenance of the sensors, follow the corresponding operating man- ual. Cleaning Occasionally wipe the outside of the measuring instrument with a damp, lint- free cloth. Disinfect the housing with isopropanol as required.
  • Page 47 Oxi 330i/340i What to do if... What to do if... LoBat display Cause Remedy – Batteries almost empty – Replace batteries (see section 5.1 M AINTENANCE Instrument does Cause Remedy not react to – Operating condition undefined – Processor reset:...
  • Page 48 What to do if... Oxi 330i/340i Error message E7 Cause Remedy Membrane damaged – Membrane damaged – Regenerate probe – Membrane head not screwed – Screw membrane head tight on tight enough AR flashes Cause Remedy continuously No stable measured value –...
  • Page 49 – Output data storage and clear data storage You would like to Cause Remedy know which – e.g. question of the WTW – Press the key and switch on software version is service department instrument. The software version in the instrument is displayed.
  • Page 50 What to do if... Oxi 330i/340i ba52306e04 03/2008...

  • Page 51: Technical Data

    Oxi 330i/340i Technical data Technical data Dimensions and weight Length [mm] Width [mm] Height [mm] Weight [kg] Approx. 0.3 Mechanical structure Type of protection IP 66 Electrical safety Protective class Test certificates cETLus, CE Ambient Storage - 25 °C ... + 65 °C...
  • Page 52 Technical data Oxi 330i/340i Accuracy mg/l ± 0.5 % of the measured value (± 1 digit) Concentration at an ambient temperature of 5 °C ... 30 °C ± 0.5 % of the measured value Saturation when measuring in the range of ±...
  • Page 53 Oxi 330i/340i Technical data Internal resistance < 5 Ohm (current limited to max. 0.2 mA out- put current) Serial interface Automatic switchover when a PC or a printer is connected via the cable, (only Oxi 340i) AK 340/B or AK 325/S.
  • Page 54 Technical data Oxi 330i/340i FCC Class A Equipment Statement Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.

  • Page 55: Lists

    Oxi 330i/340i Lists Lists This chapter provides additional information and orientation aids. Abbreviations The list of abbreviations explains the indicators and the abbreviations that ap- pear on the display and in the manual. Specialist terms The glossary briefly explains the meaning of the specialist terms. However, terms that should already be familiar to the target group are not described here.
  • Page 56 Lists Oxi 330i/340i Abbreviations AutoRead (drift control) ARng Automatic range switching Measuring instrument measures with highest reso- lution °C Temperature unit, degrees Celsius Calibration D. O. Dissolved Oxygen Error message see chapter 6 W HAT TO DO IF Initialization Resets individual basic functions to the status they...
  • Page 57 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. Of- ten, this expression is also used when the measuring system is adjust- ed at the same time (see adjusting).
  • Page 58 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 probe of the same type of construction.
  • Page 59 Oxi 330i/340i Index Index Measuring ranges with CellOx325 Analog output Measuring ranges with Authorized use DurOx AutoRange Measuring ranges with AutoRead DurOx325 Criteria Measuring the D. O. concentration Measuring the D. O. Calibrating saturation Calibration start Calibration protocol (340i) Operating safety...
  • Page 60 Index Oxi 330i/340i ba52306e04 03/2008...
  • Page 61 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...

This manual is also suitable for:

Ox i340iOxi 3300iOxi 3400i

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