SCHOTT Lab 850 Operating Manual
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SCHOTT Lab 850 Operating Manual

Laboratory ph meter
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Operating manual
Lab 850
Laboratory pH meter
ba75890e01
11/2009

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  • Page 1 Operating manual Lab 850 Laboratory pH meter ba75890e01 11/2009...
  • Page 2 Lab 850 Accuracy when going to The use of advanced technology and the high quality standard of our press instruments are the result of continuous development. This may result in differences between this operating manual and your instrument. Also, we cannot guarantee that there are absolutely no errors in this manual.
  • Page 3 Angaben im Kapitel the specifications in the indications du chapitre chapter Technische Daten pH-Meter Lab 850 30. Oktober 2009 SI Analytics GmbH Hattenbergstr. 10 D-55122 Mainz Deutschland, Germany, Allemagne 30. Oktober, October 30, 30 octobre 2009...
  • Page 4 Lab 850 ba75890e01 11/2009...

  • Page 5: Table Of Contents

    Contents Lab 850 - Contents Overview ........7 Keypad .
  • Page 6 Contents Lab 850 4.7.2 Measurement settings ....45 4.7.3 Interval for automatic storing (AutoStore) ..49 4.7.4...

  • Page 7: Overview

    Lab 850 Overview Overview The compact Lab 850 precision pH meter enables you to perform pH measurements rapidly and reliably. The Lab 850 provides the maximum degree of operating comfort, reliability and measuring certainty for all applications. The proven calibration procedures and special stability control function (SC) support your work with the pH meter.

  • Page 8: Keypad

    Overview Lab 850 Keypad MODE In this operating manual, keys are indicated by brackets <..> . The key symbol (e.g. <OK>) indicates a keystroke in this operating manual. <On/Off>: Switch meter on / off <On/Off >: Reset calibration values <MODE>: Select measured parameter <MODE...

  • Page 9: Display

    Lab 850 Overview Display Status display indicator U pH BUFFER CalClock (calibration interval and sensor evaluation) mV/pH Time Baud Measured value °F Day.Month display °C Year Ident Temperature display AutoCal Auto Store CalError LoBat and further function indicators Function display...

  • Page 10: Socket Field

    Overview Lab 850 Socket field Connectors: pH electrode Reference electrode Temperature sensor Power pack RS 232 interface CAUTION Only connect sensors to the meter that cannot return any voltages or currents that are not allowed (> SELV and > current circuit with current limiting).

  • Page 11: Safety

    Lab 850 Safety Safety This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the meter. Consequently, all responsible personnel must read this operating manual before working with the meter. The operating manual must always be available within the vicinity of the instrument.

  • Page 12: Authorized Use

    Safety Lab 850 Authorized use This meter is authorized exclusively for pH and ORP measurements in the laboratory. The technical specifications as given in chapter 7 T ECHNICAL DATA (page 59) must be observed. Only the operation and running of the meter according to the instructions given in this operating manual is authorized.
  • Page 13 Lab 850 Safety Safe operation If safe operation is no longer possible, the instrument must be taken out of service and secured against inadvertent operation! Safe operation is no longer possible if the meter: has been damaged in transport has been stored under adverse conditions for a lengthy period of...
  • Page 14 Safety Lab 850 ba75890e01 11/2009...

  • Page 15: Commissioning

    Lab 850 Commissioning Commissioning Scope of delivery Lab 850 laboratory meter Power pack 4 batteries 1.5 V Mignon type AA Transparent cover Operating manual Initial commissioning Perform the following activities: Insert batteries Switch on the meter Set the date and time Connect the power pack (for line power operation only).
  • Page 16 Commissioning Lab 850 CAUTION Make sure that the poles of the batteries are the right way round. ± ± signs on the batteries must correspond to the signs in the battery compartment. Only use leakproof alkaline manganese batteries. Switching on the meter Switch on the meter with <On/Off>.

  • Page 17: Operation

    Lab 850 Operation Operation Switching on the meter Place the meter on a flat surface and protect it from intense light and heat. Press the <On/Off> key. A display test is briefly displayed. Subsequently, the meter switches to the measuring mode (measured value display).

  • Page 18: General Operating Principles

    Operation Lab 850 General operating principles This section contains basic information on the operation of the Lab 850. 4.2.1 Operating modes The instrument has the following operating modes: Measurement The display indicates the measurement data in the measured value display...

  • Page 19: Measuring

    Lab 850 Operation Measuring Preparatory activities Perform the following preparatory activities when you want to measure: Connect an electrode to the meter. Adjust the temperature of the buffer solutions or test solutions, or measure the current temperature, if you measure without a temperature sensor.

  • Page 20: Measuring The Ph Value

    Operation Lab 850 4.3.1 Measuring the pH value Perform the preparatory activities according to page 19. Immerse the pH electrode in the test sample. Using <MODE>, scroll as necessary until the measured parameter pH is displayed. °C Stability control SC...

  • Page 21: Measuring The Orp

    Lab 850 Operation 4.3.2 Measuring the ORP The meter can, in conjunction with an ORP electrode, measure the ORP (mV) of a solution. Perform the preparatory activities according to page 19. Immerse the ORP electrode in the test sample. If necessary, call up the measured parameter U with <MODE>.

  • Page 22: Calibration

    Operation Lab 850 Calibration Why calibrate? pH electrodes age. This changes the zero point (asymmetry) and slope of the pH electrode. As a result, an inexact measured value is displayed. Calibration determines the current values of the zero point and slope of the electrode and stores them. Thus, you should calibrate at regular intervals.
  • Page 23 Lab 850 Operation Buffer set* pH values Mettler Toledo TEC * 1.995 25 °C 4.005 7.002 9.208 Fisher * 2.007 25 °C 4.002 7.004 10.002 Fluka BS * 4.006 25 °C 6.984 8.957 Radiometer * 1.678 25 °C 4.005 7.000 9.180...
  • Page 24 Operation Lab 850 Note The buffer set is selected in the menu for measurement settings (see page 45).A list of the stored buffer sets can be downloaded to the interface (Set 1 ... 16) with <CAL > while selecting the buffer set in the menu for measurement settings.
  • Page 25 Lab 850 Operation Displaying the You can display the data of the last calibration (see page 36). calibration data Subsequently, you can transmit the displayed calibration data to the interface, e. g. to a printer or PC, with the <CAL >...
  • Page 26 Operation Lab 850 CalClock Calibra- Zero point Slope tion record [mV] [mV/pH] < -30 or ... -62 or CalError CalError > 30 ... -50 Eliminate the error according to page 55 Preparatory activities Switch on the meter with <On/Off>. Connect a pH electrode to the meter.

  • Page 27: Calibration Interval (Int.c)

    Lab 850 Operation 4.4.1 Calibration interval (Int.C) The calibration interval and calibration evaluation are indicated on the display as the CalClock. CalClock The remaining time of the calibration interval is indicated by the segmented ring around the calibration evaluation. This segmented ring reminds you to calibrate regularly.

  • Page 28: Automatic Calibration (Autocal)

    Operation Lab 850 4.4.2 Automatic calibration (AutoCal) For this procedure, use one, two or three buffer solutions of the selected buffer set in any order. Note The steps 2, 6 and 10 are not necessary if you use a temperature sensor.
  • Page 29 Lab 850 Operation BUFFER °C AutoCal Note Here you can cancel the calibration procedure with <MODE>. This corresponds to a single-point calibration. The value of the zero point (Asy) is displayed for 10 seconds, then the value of the slope (Slo) is displayed for 10 seconds.
  • Page 30 Operation Lab 850 Note Here you can cancel the calibration procedure with <MODE>. This corresponds to a two-point calibration. The value of the zero point (Asy) is displayed for 10 seconds, then the value of the slope (Slo) is displayed for 10 seconds. After this the meter switches to the measuring mode.

  • Page 31: Saving

    Lab 850 Operation Saving The pH meter has an internal data memory. It can store up to 800 datasets. A complete dataset consists of: Date/time Memory location number ID number Measured value Temperature Temperature measuring procedure (manual or automatic) You can transmit measured values (datasets) to the data memory in two ways: Store manually (<STO>)
  • Page 32 Operation Lab 850 Ident Store Using <▲><▼>, enter the required ID number (1 ... 9999). Confirm with <OK>. The dataset is stored. The meter switches to the measuring mode. Message StoFull This message appears when all of the 800 memory locations are occupied.

  • Page 33: Automatic Storage At Intervals (Autostore)

    Lab 850 Operation 4.5.2 Automatic storage at intervals (AutoStore) In order to store measured values automatically at certain time intervals, set the storage interval (Int.1). Setting the save interval The default setting for the storage interval (Int 1) is OFF.
  • Page 34 Operation Lab 850 Confirm with <OK>. Ident, the entry of the ID number is displayed. Ident Set the required ID number with <▲><▼>. Confirm with <OK>. The meter switches to the measured value display and starts the measuring and storing procedure.

  • Page 35: Downloading The Data Memory

    Lab 850 Operation 4.5.3 Downloading the data memory You can download stored measurement datasets: to the display to the interface (page 39) Download to the display Open the memory menu with <RCL>. If necessary, scroll with <RCL> until Sto disp (measurement datasets) is displayed.

  • Page 36: Erasing The Data Memory

    Operation Lab 850 4.5.4 Erasing the data memory You can erase all stored measurement datasets. Open the memory menu with <RCL>. If necessary, scroll with <RCL> until Sto disp or Sto prt is displayed. Press <RCL > to display the Clr All function.
  • Page 37 Lab 850 Operation press <OK> to display further calibration data (date, zero point, slope) press to switch over the unit of the zero point (Asy) <▲><▼> (while the zero point is being displayed) press to switch over the unit of the slope (Slo) <▲><▼>...

  • Page 38: Transmitting Data

    Operation Lab 850 Transmitting data The meter has a RS232 interface (serial port). Via the interface, you can transmit data to a PC and update the meter software. The RS232 interface enables to transmit data to an external printer. Note The relevant interface cable has to be connected if you want to download data to an interface (USB or RS232).

  • Page 39: Options For Data Transmission

    Lab 850 Operation 4.6.1 Options for data transmission Via the RS 232 interface, you can transmit data to a PC or an external printer. The following table shows which data are transmitted to the interface in which way: Data Control...

  • Page 40: Automatically Downloading Measurement Datasets At Intervals

    Operation Lab 850 4.6.2 Automatically downloading measurement datasets at intervals In order to automatically download to the interface measured values at certain time intervals, set the download interval (Int.2). Setting the download The default setting for the download interval (Int 2) is OFF.

  • Page 41: Operation With Multilab Pilot

    Lab 850 Operation – Baud rate: selectable from 1200, 2400, 4800, 9600, – Handshake: RTS/CTS + Xon/Xoff – PC only: – Parity: none – Data bits: 8 – Stop bits: 2 Socket assignment 2 RxD (RS232) 3 TxD 5 SGnd...

  • Page 42: Settings

    Operation Lab 850 Settings You can adapt the meter to your individual requirements. The settings are done in the following menus: System settings (<OK >) – Baud rate (Baud) – Switch-off interval (t.Off) – Date (Day.Month) – Date (Year) – Time (Time) Settings for calibration and measurement (<MODE...

  • Page 43: System Settings

    Lab 850 Operation 4.7.1 System settings The default setting is printed in bold. Baud rate (Baud) 1200, 2400, 4800, 9600 Switch-off interval (t.Off) 10, 20, 30, 40, 50 min, 1, 2, 3, 4, 5, 10, 15, 20, 24 h Date (Day.Month)
  • Page 44 Operation Lab 850 Set the switch-off interval with <▲><▼>. Confirm with <OK>. Day.Month, the setting of the date is displayed. The day display flashes. Date and time Day.Month Set the date of the current day with <▲><▼> . Confirm with <OK>.

  • Page 45: Measurement Settings

    Lab 850 Operation 4.7.2 Measurement settings These settings apply to calibration and measurement (the default setting is printed in bold). Number of the buffer set for pH 1 ... 16 calibration (SET) Display during calibration (BUFFER) pH (buffer nominal value),...
  • Page 46 Operation Lab 850 Display during calibration (bUFF) AutoCal Using <▲><▼>, select the display during calibration pH or U. Confirm with <OK>. SLO, the unit of the value for the slope (mV/pH or %) is displayed. Unit of the value for the...
  • Page 47 Lab 850 Operation Unit of the value for the zero point (ASY) Using <▲><▼>, select the unit for the zero point. Confirm with <OK>. rES, the setting of the resolution is displayed. Resolution (rES) Using <▲><▼>, toggle between Hi (0.001)and Lo (0.01).
  • Page 48 Operation Lab 850 Temperature unit (Unit) °C Using <▲><▼>, toggle between °C and °F. Confirm with <OK>. Int.C, the setting of the calibration interval is displayed. Calibration interval (Int.C) Time AutoCal Set the interval with <▲><▼>. Confirm with <OK>. The measurement settings are completed.

  • Page 49: Interval For Automatic Storing (Autostore)

    Lab 850 Operation 4.7.3 Interval for automatic storing (AutoStore) After setting the interval for automatic storing the current measurement dataset is stored at the specified interval. AutoStore interval (Int.1) OFF, 5 s, 10 s, 20 s, 30 s, 1 min, 2 min, 5 min, 10 min, 20 min, 30 min, 60 min Press <STO...

  • Page 50: Interval For Automatic Data Transmission

    Operation Lab 850 4.7.4 Interval for automatic data transmission The interval for automatic data transmission serves to transmit the current measurement dataset to the interface at the specified interval. Data transmission interval OFF, 5 s, 10 s, 20 s, 30 s, 1 min, 2 min, (Int.2)

  • Page 51: Reset

    Lab 850 Operation Reset 4.8.1 Resetting calibration values This function resets the calibration values to the default condition. All other meter settings are retained. Calibration values in the Zero point pH 7.000 (0 mV) default condition Slope 100 % (-59.2 mV/pH) Note The measuring system is not calibrated after a reset.

  • Page 52: Resetting All Meter Settings

    Operation Lab 850 4.8.2 Resetting all meter settings This function resets to the default condition all meter settings including the calibration values. The corresponding values are given on the following pages: Calibration values page 51 System settings page 43 Measurement settings...

  • Page 53: Maintenance, Cleaning, Disposal

    Lab 850 Maintenance, cleaning, disposal Maintenance, cleaning, disposal Maintenance The only maintenance activity required is replacing the batteries. Note For maintenance of the electrodes refer to the relevant operating manuals. 5.1.1 Replacing the batteries Open the battery compartment (1) on the underside of the meter.

  • Page 54: Cleaning

    Maintenance, cleaning, disposal Lab 850 Cleaning Occasionally wipe the outside of the meter with a damp, lint-free cloth. Disinfect the housing with isopropanol as required. CAUTION The housing is made of synthetic material (ABS). Thus, avoid contact with acetone or similar detergents that contain solvents.

  • Page 55: What To Do If

    Lab 850 What to do if... What to do if... Error message Cause Remedy Err1 pH electrode: – Measured value outside the – Use a suitable electrode measuring range – Air bubble in front of the – Remove air bubble junction –...
  • Page 56 What to do if... Lab 850 Cause Remedy – Incorrect buffer solutions – Change calibration procedure – Buffer solutions too old – Use only once. Note the shelf life – Buffer solutions depleted – Change solutions No stable measured Cause...
  • Page 57 Lab 850 What to do if... Obviously incorrect Cause Remedy measured values pH electrode: – pH electrode unsuitable – Use a suitable electrode – Temperature difference – Adjust temperature of buffer between buffer and test sample or sample solutions too high –...
  • Page 58 What to do if... Lab 850 ba75890e01 11/2009...

  • Page 59: Technical Data

    Lab 850 Technical data Translation of the legally binding German version Stand October 30, 2009 Technical data General data Dimensions approx. 240 x 190 x 80 mm Weight approx. 1.0 kg (without power pack, without stand) Mechanical structure Type of protection...
  • Page 60 Technical data Lab 850 Translation of the legally binding German version Stand October 30, 2009 Guidelines EC guideline 2004/108/EC and norms used EN 61326-1 Class B FCC Class A Instrument safety EC guideline 2006/95/EC EN 61010-1 ANSI/UL 61010-1 CAN/CSA-C22.2 No. 61010-1...

  • Page 61: Measuring Ranges, Resolution, Accuracy

    Lab 850 Technical data Translation of the legally binding German version Stand October 30, 2009 Measuring ranges, resolution, accuracy Measuring ranges, Variable Measuring range Resolution resolution - 2.000 ... + 19.999 0.001 - 2.00 ... + 19.99 0.01 U [mV] - 999.9 ...
  • Page 62 Technical data Lab 850 Translation of the legally binding German version Stand October 30, 2009 ba75890e01 11/2009...

  • Page 63: Lists

    Lab 850 Lists Lists This chapter provides additional information and orientation aids. Abbreviations The list of abbreviations explains abbreviations that appear on the display or when dealing with the instrument. Specialist terms The glossary briefly explains the meaning of the specialist terms.
  • Page 64 Lists Lab 850 Abbreviations °C Temperature unit °Celsius °F Temperature unit, °Fahrenheit Zero point (asymmetry) AutoCal Automatic calibration using a selected buffer set Calibration CalError Error message (see W ...) HAT TO DO IF Err1 Overflow Display range exceeded Err2, Err4 Error message (see W ...)
  • Page 65 Lab 850 Lists Glossary Asymmetry see zero point Resolution Smallest difference between two measured values that can be displayed by a meter. AutoRange Name of the automatic selection of the measuring range. Junction The junction is a porous body in the housing wall of reference electrodes or electrolyte bridges.
  • Page 66 Lists Lab 850 Potentiometry Name of a measuring technique. The signal (depending on the measured parameter) of the electrode is the electrical potential. The electrical current remains constant. ORP voltage The ORP is caused by oxidizing or reducing substances dissolved in water if these substances become effective on an electrode surface (e.
  • Page 67 Lab 850 Lists Trademarks used Trademark Owner of the trademark Merck Merck KGaA Mettler Toledo Mettler Toledo Fisher Fisher Scientific Company Fluka Fluka AG Radiometer Radiometer Baker Mallinckrodt Baker, Inc. Metrohm Metrohm AG Beckman Beckman Instruments, Inc. Hamilton Hamilton Company Corporation...
  • Page 68 Lists Lab 850 ba75890e01 11/2009...
  • Page 69 Lab 850 Lists Index Authorized use ..... . 12 Operation location ....17 AutoCal .
  • Page 70 Lists Lab 850 ba75890e01 11/2009...
  • Page 71 You can change the language via the language menu. Firmware update Proceed as follows: Connect the Lab 850 to a serial interface (COM port) of the PC with the aid of the interface cable Z390. Make sure the Lab 850 is switched on.
  • Page 72 Lab 850 ba75890e01 11/2009...
  • Page 73 SI Analytics GmbH Postfach 2443 D-55014 Mainz Hattenbergstr. 10 D-55122 Mainz Telefon +49 (0) 61 31/66 5111 Telefax +49 (0) 61 31/66 5001 Email: support@ si-analytics.com Internet: www.si-analytics.com...

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