Extech Instruments DO700 User Manual
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Extech Instruments DO700 User Manual

Digital dissolved oxygen, conductivity, tds and ph meter
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User's Guide
Digital Dissolved Oxygen,
Conductivity, TDS and pH Meter
Model DO700

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Summary of Contents for Extech Instruments DO700

  • Page 1 User's Guide Digital Dissolved Oxygen, Conductivity, TDS and pH Meter Model DO700...
  • Page 2 Introduction Congratulations on your purchase of the Extech DO700 meter. For best results, please read the entire manual before use. The DO700 measures Dissolved Oxygen (DO), Conductivity, pH, mV, and temperature parameters. Conductivity measurements also yield TDS (total dissolved solids), Salinity, and Resistivity readings.

  • Page 3: Meter Description

    Supplied Equipment List DO700 Meter Dissolved Oxygen, Conductivity, and pH Electrode Standard pH buffer solutions (4.00pH, 7.00pH, and 10.01pH) / 50ml Standard Conductivity solution (1413µS/cm) / 50ml Standard Dissolved Oxygen solution (30ml) Dissolved Oxygen Membrane cap for DO electrode Cathode polishing paper Screwdriver (for removing battery compartment cover) Batteries (2 x ’AA’...

  • Page 4: Display Description

    MEMORY STORE and RECALL Key a) In the measurement mode, momentary presses store the displayed readings. Press and hold for at least 2 seconds to recall a saved reading b) In programming mode, press to change the displayed number or ON/OFF state DO700-en-GB_v2.3 3/15...
  • Page 5 From the RECALL mode, press and hold the ENTER key for at least five (5) seconds. The LCD display will show ‘CLR’ indicating that all of the stored readings have been erased. The unit will automatically return to the normal measurement mode after approximately 2 seconds. DO700-en-GB_v2.3 3/15...

  • Page 6: Ph Measurement Mode

    For all other applications, a 3-Point Calibration is recommended. Always perform a 3-Point Calibration on new probes and probes that have been in use for long periods. This maximizes measurement slope linearity. Press the ENTER key to exit the Calibration mode. DO700-en-GB_v2.3 3/15...
  • Page 7 Such measurements are sometimes used in the electrical power and petrochemical industries. Set these parameters to ON only if necessary, otherwise leave these parameters in the OFF state. DO700-en-GB_v2.3 3/15...
  • Page 8 1. From the P7 menu, use the CAL or the M+/RM keys to select ON (reset the factory default settings) or OFF (cancel edit). 2. Momentarily press MODE to move to the first parameter (P1) or press ENTER to return to the normal measurement mode. DO700-en-GB_v2.3 3/15...
  • Page 9 For abnormal readings, try calibrating again; if the problem persists replace the Electrode. The user can also try resetting the meter to factory default conditions per Parameter P7 (detailed in an earlier section). Electrode life can be shortened by heavy use, extreme conditions, and improper maintenance. DO700-en-GB_v2.3 3/15...
  • Page 10 From the P2 menu, use the CAL or the M+/RM keys to select a 0, 10, or 20 minute Auto Power OFF time. Momentarily press MODE to move back to Parameter P1, or press ENTER to return to the normal measurement mode. DO700-en-GB_v2.3 3/15...

  • Page 11: Conductivity Measurement Mode

    (b) (China series) — 146.6µS/cm, 1408µS/cm, 12.85mS/cm and 111.3 mS/cm The DO700 offers a unique one-point calibration feature. The user can select the calibration solution closest to the expected measuremnt value. In general the most common calibration solution is 1413 µS/cm.
  • Page 12 (in this case, Parameter P Tcc). If more than one parameter is changed, only the code from the first parameter change is displayed. DO700-en-GB_v2.3 3/15...
  • Page 13 1. From the P2 menu, use the CAL or the M+/RM keys to select the desired electrode constant (0.1, 1.0, or 10). The default setting is K=1.0. 2. Momentarily press MODE to move to the next parameter (P3), or press ENTER to return to the normal measurement mode. DO700-en-GB_v2.3 3/15...
  • Page 14 Only select ON if absolutely necessary. 2. Momentarily press MODE to move to the first parameter (P1) or press ENTER to return to the normal measurement mode DO700-en-GB_v2.3 3/15...
  • Page 15 Replace the electrode if the above cleaning methods are ineffective. Reset the meter to its factory default settings (Parameter P9) if unusual operation is noticed. If the reset process does not solve the issue, return the unit for an evaluation. DO700-en-GB_v2.3 3/15...
  • Page 16 The LCD will display a flashing ‘100%’ indicating that the calibration is complete. After several seconds the meter will display ‘END’ and return to the measuring mode. If the displayed reading does not stabilize, polarize again per the Preparation section above, and retry this calibration procedure. DO700-en-GB_v2.3 3/15...
  • Page 17 Please allow 3 to 5 minutes for the thermistor to gage a stable temperature measurement. DO measurements are also greatly affected by Barometric pressure. The DO700 meter has an automatic Barometric pressure compensation function. The DO electrode must not be left static in the test solution. Always stir the electrode in the solution.
  • Page 18 Use the CAL or RM key to change the setting (refer to the standard Barometric pressure table). Press and hold CAL or RM to quickly scroll the value. Press MODE to move to the next parameter or press ENTER to confirm and return to the measuring mode. DO700-en-GB_v2.3 3/15...
  • Page 19 If large air bubbles are present, re-assembly will be required. 7. Do not touch the sensitive membrane when using the electrode or replacing the membrane cap. Oils from the skin will affect the quality of the membrane and decrease the rate of oxygen permeability. DO700-en-GB_v2.3 3/15...
  • Page 20 You can hand over your used batteries / accumulators at collection points in your community or wherever batteries / accumulators are sold! Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle DO700-en-GB_v2.3 3/15...

  • Page 21: Specifications

    360 x 270 x 76mm (14.1 x 10.6 x 3”) / 1.6kg (3.4 lbs) Quality/Safety certification ISO9001, CE and CMC Ambient Conditions Environment temperature 5 to 35 C (41 to 95 Environmental humidity ≤85% IP rating IP57 Dustproof and waterproof DO700-en-GB_v2.3 3/15...

  • Page 22: Appendix A - Abbreviation Glossary

    Electrode constant setting Temperature Compensation Setting for temperature compensation Coefficient coefficient Reference Temperature Reference temperature setting Constant Calibration Calibration that uses a constant for reference rather than a solution Calibration Conductivity Dissolved Oxygen Resistivity Total Dissolved Solids Salinity DO700-en-GB_v2.3 3/15...

  • Page 23: Appendix B - Do Of Saturated Water Vs. Temperature

    7.07 13.44 9.27 6.95 13.09 9.08 6.84 12.74 8.90 6.73 12.42 8.73 6.63 12.11 8.57 6.53 11.81 8.41 6.43 11.53 8.25 6.34 11.26 8.11 6.25 11.01 7.96 6.17 10.77 7.82 6.09 10.53 7.69 6.01 10.30 7.56 10.08 7.43 DO700-en-GB_v2.3 3/15...

  • Page 24: Appendix C - Do Of Saturated Water Vs Barometric Pressure And Temperature

    Conversion factor for mmHg and kPa: mmHg × 0.13333 = kPa = P×DO ÷ 760 Note: DO = DO concentration under temperature (t), barometric pressure (P, mg/L) P = Barometric pressure (mmHg) = DO concentration under temperature (t), barometric pressure (760mmHg, mg/L) 760 = Barometric pressure (mmHg) DO700-en-GB_v2.3 3/15...

  • Page 25: Appendix D - Do Of Saturated Water Vs. Altitude

    7447 0.58 7230 0.56 11367 0.88 15000 8759 0.58 8532 0.57 13445 0.90 Copyright © 2013-2015 FLIRSystems, Inc. All rights reserved including the right of reproduction in whole or in part in any form IS O-9001 Certified www.extech.com DO700-en-GB_v2.3 3/15...

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