Knick 703 Instruction Manual
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Knick 703 Instruction Manual

Laboratory conductivity meter
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Instruction Manual
703 Laboratory
Conductivity Meter

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  • Page 1 Instruction Manual 703 Laboratory Conductivity Meter...
  • Page 2 P.O.Box 37 04 15 D-14134 Berlin Germany Tel: +49 (0) 30-80191-0 Fax: +49 (0) 30-80191-200 www.knick.de knick@knick.de Warranty Defects occurring within 3 years from delivery date shall be remedied free of charge at our works (carriage and insurance paid by sender).

  • Page 3: Table Of Contents

    1 The 703 Laboratory Conductivity Meter ........

  • Page 4: Information On This Instruction Manual

    703 Laboratory Conductivity Meter Information on this instruction manual Warnings and notes Instructions marked with this sign must be strictly observed for reasons of your own safety! Failure to follow these instructions may result in injuries Notes provide important information that should be strictly followed when using the device.

  • Page 5: Safety Information

    Safety information Be sure to read and observe the following instructions! Before connecting the device to the power supply, make sure that the voltage corre- sponds with the rating given on the rating plate of the device. Opening the device exposes live parts. Therefore, it shall not be opened. If a repair should be required, return the device to our factory.

  • Page 7: The 703 Laboratory Conductivity Meter

    • Power cord • This instruction manual Short device description • The 703 Laboratory Conductivity Meter is used for electrolytic conductivity measurement in the lab. • The meter can be operated with either 2-electrode or 4-electrode sensors. In conjunction with the...
  • Page 8 703 Laboratory Conductivity Meter ® • The Sensoface sensor monitoring function mon- itors the conductivity sensor and measuring equipment and provides information on sensor selection and handling. It reports clock memory loss and requests regular checks in accordance with GLP.

  • Page 9: Operation

    25 °C S/cm °C mS/cm time meas print on/standby diag enter Konduktometer 703 0 Ausg. RS 232 C Zweipol-Zelle Vierpol-Zelle 1, 2, 3 Connection for two-electrode sensor Connection for four-electrode sensor (ZU 6985) 5, 6 Temperature probe connection 7, 8...

  • Page 10: General Information

    703 Laboratory Conductivity Meter General information Keypad Pressing turns the meter on or on/standby on/standby switches to standby mode. Standby mode is indi- ® cated by a lighted Sensoface status indicator or two measurement symbols. At power-on, the meter automatically performs a short self test and then goes to measuring mode.
  • Page 11 Pressing exits a function level and returns you to measuring mode. meas Pressing in measuring mode prints out the print print currently measured values for conductivity and temperature with date and time. Pressing on one of the function levels prints print out a complete record of the data stored.
  • Page 12 703 Laboratory Conductivity Meter Menu structure ® ® Sensoface Sensoface monitors the conductivity sensor and automatic monitoring measuring equipment and provides information on function sensor selection and handling. It reports clock memory loss and requests regular checks in accor- dance with GLP.

  • Page 13: Power-On And Start-Up

    GLP timer are not affected (reserve power approx. 1 year). Settings, calibration and diagnostics data remain permanently stored. Sensor connection In addition to the Knick ZU 6985 4-electrode sensor with integrated temperature probe, you can also connect commercially available 2-electrode sen- sors.
  • Page 14 Simultaneous lighting-up of all display segments, ® measurement symbols and Sensoface displays • Memory test • Display of model name LF 703 To stop the short check, press Measuring mode In the measuring mode the left-hand display always indicates the conductivity value. If the automatic range selection has been set (see Pg.
  • Page 15 Right-hand display: • Temperature [°C] • Time • Temperature coefficient [%/K] A flashing point on the temperature display indi- cates that no temperature probe is connected. The meter now uses the manually selected tempera- ture. If you have connected a printer, pressing print print the measuring mode gives you a printout of the cur-...

  • Page 16: Short Instructions

    703 Laboratory Conductivity Meter Short instructions Measuring with the Knick 4-electrode sensor ZU 6985 Connect the ZU 69855 4-electrode sensor to socket on/standby 4 and switch on the meter. The automatic short check runs. The ZU 6985 4-electrode sensor is equipped with an integrated temperature probe.
  • Page 17 Measuring with a 2-electrode sensor with external temp probe Connect the 2-electrode sensor to the sockets 2 on/standby and 3. If there is a shielding, connect it to socket 3. Connect the external temperature probe to sockets 5 and 6. Switch on the meter. The automatic short check runs.
  • Page 18 703 Laboratory Conductivity Meter Determining an unknown cell constant Connect the conductivity sensor and, if required, on/standby the temperature probe as described in the instruc- tions and switch on the meter. The automatic short check runs. Press to access the Parameter level. Select...
  • Page 19 Measuring without tempera- If no temperature probe is connected, the meter ture probe uses the manually selected temperature. In this case, the decimal point of the temperature display will flash in measuring mode. Press to access the Parameter level. Select PAR EDIT using and confirm with As the first parameter-setting step the entry of the...
  • Page 20 703 Laboratory Conductivity Meter Select the temperature compensation TC using Switch on using . Confirm your en- try with In the next step enter the temperature coefficient of the solution to be measured using and confirm with Then enter the reference temperature using .

  • Page 21: Parameter Level

    Parameter level On the Parameter level all variable device parame- ters are set. Parameters are set in dialog mode using different menus. Activating parameter setting Press to exit measuring mode and access the main menu of the Parameter level. To exit Parame- ter level, press .
  • Page 22 703 Laboratory Conductivity Meter Typical setting procedure The meter is factory-set for automatic range selec- tion. However, you want to select the range manu- ally. Press to access the Parameter level. Press to select the EDIT menu. Press to confirm and open the EDIT menu.
  • Page 23 Confirm your entry with . The next parame- ter will be displayed. enter Press to exit Parameter level. meas Printout of parameter record If you have connected the pH meter to a printer, you can print out all stored parameter settings. Press to open the Parameter level.
  • Page 24 703 Laboratory Conductivity Meter Parameters In the following, the individual parameters and their possible settings will be explained. Manual temperature (50 to +150 °C) If no temperature probe is connected, the meter uses the manually selected temperature. In this case, the decimal point of the temperature display will flash in measuring mode.
  • Page 25 ® Sensoface (off/on) ® The Sensoface display can be turned on or off. If ® Sensoface display is turned off, standby mode is indicated by two lighted measurement symbols. ® Display of Sensoface parameters on the Diagnos- tics level is not affected. For information on Senso- ®...
  • Page 26 703 Laboratory Conductivity Meter The timer is reset by a device self-test or by enter- ing a new GLP interval. To turn off the GLP timer, enter 0 as interval time. Recorder output (20 µS/2.0 mS/20 mS/2.0 S/°C/PRNT) The recorder output can output either the conduc- tivity value or the temperature.
  • Page 27 Interface (PRNT / PC) For direct printer control, select PRNT. You can directly print out measured values and records. To connect the meter to a computer (PC), select PC. The conductivity meter will be completely com- puter controllable. All measured values and param- eters will be retrievable via computer.

  • Page 28: Calibration Level

    For the Knick ZU 6985 4-electrode sensor, the cell constant is printed on the rating plate at the sensor cable.
  • Page 29 Manual calibration by input of When the cell constant of the conductivity sensor cell constant used is known, it can be directly entered. When using a calibration solution, the conductivity value is adjusted by modifying the cell constant. Press to confirm CAL CELL. The left display shows the measured uncompen- sated conductivity and the right display shows the cell constant.
  • Page 30 703 Laboratory Conductivity Meter Press to confirm CAL AUTO. Immerse the conductivity sensor and temperature probe in the calibration solution and press start the calibration. If you do not want to calibrate, select CAL NO using and press to exit Calibration level.
  • Page 31 Display of calculated cell constant. End of calibration Always rinse the sensor thoroughly after a calibra- tion and between two measurements. Carrying over the solution can cause considerable measure- ment errors, particularly at low conductivities. Either distilled water can be used as a rinsing liquid, or the cell should be pre-rinsed with measuring solution.

  • Page 32: Diagnostics Level

    703 Laboratory Conductivity Meter Diagnostics level On the Diagnostics level the complete conductivity diag measurement equipment is checked. This also serves for quality management to ISO 9000. Activating diagnostics Press to exit measuring mode and access the main menu of the Diagnostics level.
  • Page 33 ® Sensoface informs you when the current conduc- tivity range can no longer be reliably measured with the sensor being used. Ranges: Cell const. –1 0.001 > 20 µS > 10 µS 0.01 > 200 µS > 100 µS > 2 mS >...
  • Page 34 703 Laboratory Conductivity Meter If the battery voltage is too low, the operation of the clock and the GLP timer is no longer ensured. Battery voltage okay Battery voltage still sufficient Battery voltage too low Extreme interferences or insufficient battery voltage ®...
  • Page 35 Linearity test of measuring circuit: Using an inte- grated, high-precision reference, the complete measuring circuitry is checked up to the recorder output. The displayed mV values lie across the re- corder output. Linearity test at -500 mV Linearity test at 0 mV Linearity test at +750 mV Linearity test at +1500 mV To test the input amplifier, the conductivity sensor is...
  • Page 36 703 Laboratory Conductivity Meter Press Press print Press Press Press Press on/standby Press Press Press Press End of device test Printing diagnostics record If you have connected the meter to a printer, you can print out a record of the diagnostics.

  • Page 37: Recorder Output

    Recorder output The recorder output of the Model 703 supplies an analog output signal. Galvanic output isolation is standard. Connected recorders and data acquisi- tion systems thus do not have to be floating. The output can be defined on the Parameter level...

  • Page 38: Serial Interface

    703 Laboratory Conductivity Meter Serial interface The Model 703 comes with an RS 232 interface. The interface can be defined for direct control of the ZU 0244 Lab Printer or a commercially available printer with serial port, or as a direct connection to a computer.

  • Page 39: Standard Settings For Zu 0244 Lab Printer

    Interface cable Knick offers one interface cable each as accessory for connecting the conductivity meter to a computer (PC) and to the ZU 0244 Lab Printer. • ZU 0152 interface cable for connecting the con- ductivity meter to a computer (PC):...
  • Page 40 703 Laboratory Conductivity Meter Message terminator Message terminators for read and write • Read: The conductivity meter terminates the string by ”CR” (carriage return <0D> H). • Write: The conductivity meter expects ”CR” or ”LF” (line feed <0A> H) or any combination of these as message terminator.
  • Page 41 Reading error messages Command Response Description RSF1 First error message RSFA xx;xx;xx;... All active error messages List of error messages (xx): List of error messages (xx): Conductivity range >2 S °C range –50. to +150 °C exceeded Cell constant < 0.001 cm or >...
  • Page 42 703 Laboratory Conductivity Meter Query keypad Command Response Description Query keypad print on/standby Reading results of Knick ® Fullcheck self test Command Response Unit Description RSTET xxxx [hhmm] Last Fullcheck/time RSTED xxxxxx [ddmmyy] Last Fullcheck/date RSTERR RAM test RSTERP EPROM test...
  • Page 43 Reading parameters Command Response Unit Description RPTMMV ± xxx.x [°C] Manual temperature RPTCS Temp compensation on/off RPTCVR xx.xx [%/K] Temp comp., TC RPTCR Temp comp., reference temp 20 °C 25 °C Sensoface ® RPDIE on/off RPMRS Range selection auto/fix Auto RPMRA Measurement range 0000 ..
  • Page 44 703 Laboratory Conductivity Meter Command Response Unit Description RPMSR Response to write command on/off Writing parameters Command Parameter Unit Description WPTMMV Num. par. [°C] Manual temperature WPTCS Temp compensation on/off WPTCVR Num. par. [%/K] Temp comp., TC WPTCR Temp compensation, reference temperature 20 °C...
  • Page 45 Start automatic calibration WCDISRA2 Right display, indicate temperature WCDISRATRT Right display, indicate time WCDISRATC Right display, indicate TC Reading device description Command Response Description RDMF KNICK Manufacturer RDUN Model name RDUS xxxxxx Serial number RDUV xx;xx Software/hardware version RDUP xxx;xxx;xxx...

  • Page 46: Troubleshooting

    703 Laboratory Conductivity Meter 3 Troubleshooting Error messages Range exceeded If a measured value is out of range, an error mes- sage is displayed instead of the value measured. The measured conductivity is > 2,0 S/cm. Possible causes: • Cell constant entered incorrectly The measured temperature is <...
  • Page 47 The determined cell constant is < 0.001 cm or > 199.0 cm Possible causes: • Wrong calibration solution used The calibration solution is not defined for this tem- perature. Interface error When errors occur during transmission via inter- message face, an error message is displayed. The meter has received an invalid interface com- mand.

  • Page 48: Maintenance And Cleaning

    703 Laboratory Conductivity Meter Maintenance and cleaning The Model 703 contains no user repairable compo- nents. To remove dust, dirt and spots, the external sur- faces of the meter may be wiped with a damp, lint- free cloth. A mild household cleaner or 2-propanol (isopropyl alcohol) may also be used if necessary.

  • Page 49: Appendix

    Lab Printer ZU 0244 Interface cable for connecting the ZU 0245 Model 703 to a printer (ZU 0244) Interface cable for connecting the Model ZU 0152 703 to a computer (special EMC cable) Adapter for connecting the SE 202 and...

  • Page 50: Specifications

    703 Laboratory Conductivity Meter Specifications Ranges Cond: 0.000 to 9.999 µS/cm 00.00 to 99.99 µS/cm 000.0 to 999.9 µS/cm 0.000 to 9.999 mS/cm 00.00 to 99.99 mS/cm 000.0 to 999.9 mS/cm 0000 to 2000 mS/cm Auto-ranging or manual setting °C: Pt 1000: –50.0 to +150.0...
  • Page 51 Recorder output Galvanically isolated (isolation voltage: 40 V DC, 20 V AC) –1 Cond: 100 mV/µS·cm –1 1 mV/µS·cm –1 100 mV/mS·cm –1 1 mV/mS·cm °C: 10 mV/°C User-definable for printer control Remote interface RS 232 without control lines, galvanically isolated (isolation voltage: 40 V DC, 20 V AC), user-definable as printer or computer interface, Baud rate: 600/1200/2400/4800/9600 *)
  • Page 52 ZU 6985 4-electrode sensor Ranges x: <1.00 µS/cm to >1000 mS/cm. t: –20 ... +100 °C Material System carrier: glass 4 ring electrodes: platinum, bare Protective tube (16 mm dia., ® replaceable): glass, Immersion depth min/max 60/80 mm Temperature probe Pt 1000, fast reacting Cell constant –1...

  • Page 53: Calibration Solution Tables

    703 Laboratory Conductivity Meter Calibration solution tables NaCl solution Temperature Conductivity Conductivity Conductivity [°C] [mS/cm] [mS/cm] [mS/cm] 0.01 mol/l 0.1 mol/l Saturated 0.631 5.786 134.5 0.651 5.965 138.6 0.671 6.145 142.7 0.692 6.327 146.9 0.712 6.510 151.2 0.733 6.695 155.5 0.754...
  • Page 54 KCl solution Temperature Conductivity Conductivity Conductivity [°C] [mS/cm] [mS/cm] [mS/cm] 0.01 mol/l 0.1 mol/l 1 mol/l 0.776 7.15 65.41 0.800 7.36 67.13 0.824 7.57 68.86 0.848 7.79 70.67 0.872 8.00 72.37 0.896 8.22 74.14 0.921 8.44 75.93 0.945 8.66 77.73 0.970 8.88 79.54...

  • Page 55: Glossary

    Glossary 2-electrode sensor Sensor with electrodes at which current and voltage are measured together. Usually with 2 electrodes, but also with 3 electrodes (two interconnected elec- trodes screen the third electrode). 4-electrode sensor Sensor with four electrodes for separate measure- ment of voltage and current.
  • Page 56 703 Laboratory Conductivity Meter Electrolytic conductivity Conductance multiplied by the cell constant. The conductance is the reciprocal resistance of electri- cally conductive electrolyte solutions, usually mea- sured with alternating current. Key for confirming entries. Good Laboratory Practice: Guidelines for perfor- mance and documentation of measurements in the laboratory.
  • Page 57 Reference temperature Temperature to which the conductivity is converted for temperature compensation. ® ® Sensoface Automatic monitoring system. The Sensoface indicators provide information on sensor selection and handling. Temperature coefficient Change of conductivity with temperature in %/K. Temperature compensation Conversion of the conductivity determined at the measuring temperature to the conductivity the solu- tion would have at the reference temperature.
  • Page 58 703 Laboratory Conductivity Meter Glossary...
  • Page 59 Interface commands, 33 Interface parameters, 32 Calibration, 22 Calibration level, 22 Calibration record, 25 Keypad, 4 Calibration solution tables, 47 Knick Fullcheck menu, 26, 28 Cell constant input, 23 Cleaning, 42 Commissioning, 7 Connection Mains supply, 7 Mains, 7 Sensor, 7...
  • Page 60 703 Laboratory Conductivity Meter Example, 16 VIEW menu, 15 TC input, 18 Parameters,, 15 Temperature coefficient input, 18 Print interval timer, 21 Temperature compensation Printer, ZU 0244 Reference temperature, 18 Standard settings, 33 Setting, 18 Printing Temperature coefficient, 18 Calibration record, 25...

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