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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 DO700

Page 1: ...User s Guide Digital Dissolved Oxygen Conductivity TDS and pH Meter Model DO700 ...

Page 2: ...ons Two special pH modes for distilled water and distilled water mixed with ammonia are provided These special modes offer general slope compensation and non linearity solution temperature compensation suitable for the electric power and petrochemical industries Conductivity Features Automatic frequency conversion and voltage regulation increases the Conductivity electrode range K 1 to 10 times On...

Page 3: ...solved Oxygen solution 30ml Dissolved Oxygen Membrane cap for DO electrode Cathode polishing paper Screwdriver for removing battery compartment cover Batteries 2 x AA 1 5V User s Guide Carrying Case Meter Description 1 LCD Display detailed in section below 2 Rubber protective jacket remove to access the rear battery compartment 3 Keypad detailed in section below 4 Electrode connection jack 5 Elect...

Page 4: ...oll through the available parameters b In other measuring modes press to enter the parameter setting modes The meter will scroll through the available parameters Backlight and ENTER Key a In the measurement mode momentary presses toggle the backlight on and off b When in the programming or calibration mode press to ENTER data c When in the pH mode press and hold to change the resolution 0 01 to 0 ...

Page 5: ...ment mode press the M RM key to recall the most recently stored reading RM and the data point serial number for the displayed reading will appear on the LCD The measurement information will appear on the lower right hand side of the LCD Use the CAL or M RM buttons to scroll the remaining stored readings Press the ENTER key to return to the normal measurement mode CLEAR Readings From the RECALL mod...

Page 6: ...lution Stir the solution briefly and allow it to stay in the buffer solution until a stable reading is reached 6 Press CAL again and the display will show a blinking 4 00 7 This portion of the calibration procedure is complete when the display stops blinking and shows the C3 icon The unit will automatically switch to the third point of the calibration 8 Rinse the probe in distilled water again all...

Page 7: ...olution series selection sol USA Europe U S A NIS NIST CH China P2 Distilled water pH temperature compensation setting see notes below this Table OFF ON P3 Distilled water with Ammonia pH temperature compensation setting see Notes below this Table OFF ON P4 Temperature unit setting P5 Back light display time setting 0 1 3 6min P6 Auto power off setting 0 10 20min P7 Restore to default factory sett...

Page 8: ...o the next parameter P4 or press ENTER to return to the normal measurement mode Parameter P4 Temperature Measurement Units Setting 1 From the P4 menu use the CAL or the M RM keys to turn this feature ON or OFF 2 Momentarily press MODE to move to the next parameter P5 or press ENTER to return to the normal measurement mode Parameter P5 Display Backlight Setting 1 From the P5 menu use the CAL or the...

Page 9: ...ved with purified water and diluted to 100mL The electrode should not be soaked in a distilled water protein solution or an acid fluoride solution for long periods of time In addition do not soak the electrode in organic silicon lipids For calibration accuracy the pH of the standard buffer solution must be reliable The buffer solution should be refreshed often especially after heavy use For best a...

Page 10: ...and then allow it to rest in the solution 6 When the smile face icon appears on the LCD the reading has stabilized mV Programming Parameters Prompt Parameters Code Settings P1 Back light display time 0 1 3 6 min P2 Auto power off time 0 10 20 min Parameter P1 Display Backlight Setting 1 Press MODE to access the P1 Parameter 2 Use the CAL or the M RM keys to select 0 1 3 or 6 minute default backlig...

Page 11: ...the calibration until the measurement is stable Replace the electrode if necessary Notes The meter is calibrated before leaving the factory and can generally be used right out of the box The meter can only be calibrated in the Conductivity mode and not from the TDS Salinity or Resistivity modes Measuring the Conductivity of a Sample 1 Clean and dry the conductivity electrode and immerse in the sam...

Page 12: ...of a different variety and concentration Use the chart below for common solution types use Parameter P4 as described below in the Programming Parameters Conductivity section The meter can perform an automatic non linear temperature compensation in distilled water for readings below 10 µS cm Note When the coefficient for the temperature compensation is set to 0 00 no compensation the measurment val...

Page 13: ... 0 1 3 6min P8 Auto power off setting 0 10 20min P9 Restore to default factory settings OFF ON Parameter P1 Conductivity Solution Setting 1 From the Conductivity mode press the MODE key the P1 icon appears on the LCD 2 Use the CAL or the M RM keys to toggle through the two 2 selections USA for use in the USA or Europe and CH for use in China 3 Momentarily press MODE to move to the next parameter P...

Page 14: ... return to the normal measurement mode Parameter P6 Temperature units of measure 1 From the P6 menu use the CAL or the M RM keys to select the desired unit of measure C or F 2 Momentarily press MODE to move to the next parameter P7 or press ENTER to return to the normal measurement mode Parameter P7 Display Backlight Setting 1 From the P7 menu use the CAL or the M RM keys to select 0 1 3 or 6 minu...

Page 15: ...n It s best to rinse electrodes with the sample solution The surface of the supplied conductivity electrode is plated with a layer of platinum black in order to lower the electrode polarization and increase the measuring range Do not polish the black platinum surface clean it by stirring in Distilled water If excessive organic buildup appears on the black platinum coating clean with hot water and ...

Page 16: ... sponge 5 Calibration cover bottom 6 Temperature electrode 7 Membrane cap 8 Cathode gold 9 Anode 10 Salinity electrode Calibration Use the percentage unit of measure for calibration Press the CAL key to enter the Calibration mode the flashing CAL icon will appear on the meter s LCD Put the DO electrode into the calibration solution calibration container that the probe was housed in upon delivery a...

Page 17: ...ult auto power off time is zero During DO tests the temperature affects the measurement greatly The electrode s thermistor should come in direct contact with the water sample 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 functi...

Page 18: ...y to enter P2 Immerse the DO electrode in the 12 88mS cm calibration solution the solution level should cover the electrode After stirring allow the electrode to rest in the solution and press the CAL key When the value stabilizes the smile face icon appears on the LCD along with a flashing 12 9 The calibration will finish after several minutes and will display a stable value Press the MODE key to...

Page 19: ...ng the Membrane Cap Replace the Membrane cap under the following conditions Electrode response time increases Displayed value appears incorrect or abnormal Damaged or cracked membrane Replace as follows 1 Loosen and then remove the membrane cap 2 Clean the electrode without membrane cap with distilled water and shake the water off of the electrode 3 Lightly polish the cathode surface gold with a p...

Page 20: ... cathode the surface along the gold polished arc and clean the surface of the cathode with a soft cloth or tissue Clean the electrode with distilled water and shake off the excess water Add some electrolyte to the membrane cap re assemble and then perform a full scale and a zero oxygen calibration Salinity Calibration Under normal circumstances a salinity calibration is not required The meter is e...

Page 21: ... o C 32 to 122 o F Automatic ATC TDS Specifications TDS measurement range 0 to 100 g L TDS Total Dissolved Solids TDS conversion method see Appendix E TDS conversion method Dissolved Oxygen Measuring range 0 to 40 00 mg L ppm 0 to 200 0 Resolution 0 1 0 01 mg L ppm 1 0 1 Accuracy Meter 0 10 mg L with electrode 0 40 mg L Response time 30 s 25 o C 90 response Residual current 0 1 mg L Temp compensat...

Page 22: ...pensationsettingfor DistilledWater Pure2 pHTemperaturecompensationsettingfor Distilled Water withAmmonia Constant Electrodeconstant setting TemperatureCompensation Coefficient Settingfor temperaturecompensation coefficient ReferenceTemperature Referencetemperaturesetting Constant Calibration Calibrationthat usesaconstant for reference rather thanasolution End Calibration Conductivity DissolvedOxyg...

Page 23: ... 9 86 32 7 30 1 14 22 17 9 66 33 7 18 2 13 82 18 9 46 34 7 07 3 13 44 19 9 27 35 6 95 4 13 09 20 9 08 36 6 84 5 12 74 21 8 90 37 6 73 6 12 42 22 8 73 38 6 63 7 12 11 23 8 57 39 6 53 8 11 81 24 8 41 40 6 43 9 11 53 25 8 25 41 6 34 10 11 26 26 8 11 42 6 25 11 11 01 27 7 96 43 6 17 12 10 77 28 7 82 44 6 09 13 10 53 29 7 69 45 6 01 14 10 30 30 7 56 15 10 08 31 7 43 ...

Page 24: ...61 101 46 10 09 8 26 6 96 762 101 60 10 11 8 27 6 97 763 101 73 10 12 8 28 6 98 764 101 86 10 14 8 30 6 99 765 102 00 10 15 8 31 7 00 766 102 13 10 16 8 32 7 01 767 102 26 10 18 8 33 7 02 768 102 40 10 19 8 34 7 02 769 102 53 10 21 8 35 7 03 770 102 66 10 22 8 36 7 04 771 102 80 10 23 8 37 7 05 772 102 93 10 25 8 39 7 06 773 103 06 10 26 8 40 7 07 774 103 19 10 28 8 41 7 08 775 103 33 10 29 8 42 7...

Page 25: ...94 5 36 5000 1524 84 56 635 6 89 14000 4268 64 98 488 5 29 5500 1677 83 09 624 6 77 15000 4573 64 18 482 5 23 6000 1829 81 63 613 6 65 16000 4878 63 38 476 5 16 6500 1982 80 03 601 6 52 17000 5183 62 58 470 5 10 7000 2134 78 56 590 6 40 18000 5488 61 79 464 5 03 Appendix E TDS Conversion Method Conductivity 25 C KCl NaCl TDS442 uS cm mg l Ratio mg l Ratio mg l Ratio 23 11 6 0 50 10 7 0 47 14 7 0 6...

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