Instruction Manual DO 700 Dissolved Oxygen/ºC/ºF Bench Meter Technology Made Easy ... Part of Thermo Fisher Scientific 68X541703 Rev. 1 Feb.
TABLE OF CONTENTS 1. INTRODUCTION .............................................................. 1 2. GETTING STARTED........................................................ 2 2.1 2.2 2.3 Keypad Functions ................................................................... 2 LCD Annunciators ................................................................... 3 Meter Connections .................................................................. 3 3. DISSOLVED OXYGEN / ATC ELECTRODE................... 4 4.
9. REPLACEMENTS AND ACCESSORIES........................ 23 10. TROUBLESHOOTING GUIDE......................................... 24 11. SPECIFICATIONS............................................................ 26 12. WARRANTY..................................................................... 27 13. RETURN OF ITEMS.........................................................
1. INTRODUCTION Thank you for purchasing our DO 700 series benchtop meter. This microprocessor-based meter is economical and simple to use. The design incorporates a large LCD for clear viewing, yet offers a small footprint to conserve space. The DO 700 measures Dissolved Oxygen in % saturation or concentration (mg/L or ppm) with temperature (ºC or ºF). Each meter includes a convenient slide-out card for quick reference.
2. GETTING STARTED 2.1 Keypad Functions Powers the meter on and off. Upon power on, the meter automatically begins in the mode that was last used. Calibration and memory values are retained even if meter is unplugged. Toggle between available measurement modes—% saturation or concentration (mg/L or ppm). Also used to switch to Temperature calibration during DO calibration modes. Press and hold for 5 seconds to enter SETUP mode. Toggles between measurement and calibration modes.
2.2 LCD Annunciators 2.
3. DISSOLVED OXYGEN / ATC ELECTRODE The DO 700 includes a galvanic DO electrode with built in temperature measurement. The electrode has a dual cable; a BNC connector for DO measurement and a miniphono plug for temperature. The electrode is pre-filled with electrolyte that is separated from the sample by an oxygen permeable membrane. The membrane is pre-assembled for you and fixed to a detachable cap. The pre-assembled cap design allows simple replacement and fast conditioning.
4. CALIBRATION The DO 700 has three measurement modes; DO as % saturation, DO as mg/L (or ppm) concentration, and temperature. Dissolved oxygen levels vary with temperature, barometric pressure, and salinity, so calibration must be performed with consideration of these factors. It is necessary to set the proper temperature, barometric pressure and salinity values prior to performing any DO calibration or measurement. See Section 4.1 — Temperature Calibration. See Section 5.
The DO 700 will accept one calibration point in concentration mode. The minimum value is 2 mg/L (ppm), and the calibration window is +/40% of the factory default value. Temperature and % saturation calibration should take place before attempting to perform mg/L (ppm) concentration calibration. Calibration of the concentration mode will only replace the previous concentration calibration and does not affect the % saturation calibration.
4.2 % Saturation Calibration The DO700 can be easily calibrated in air. For best accuracy, ensure that the barometric pressure value is accurate. The barometric pressure factory default is 760 mm Hg (1.013 bar), which results in a theoretical calibration value of 100% saturation in air. If the barometric pressure setting has been changed from 760 mm Hg, the meter will automatically adjust to a new % saturation calibration value instead of 100%. This new value is correct for the adjusted barometric pressure.
4) Press . The CAL indicator will blink and the secondary display will indicate the calibration point, 0.0. 5) Press to confirm the calibration. The primary display will blink briefly before calibrating to 0.0%. 6) Press to return to measurement mode, or continue with 100% calibration if desired (note 0% calibration followed by 100% calibration is not recommended---always perform 100% calibration first). 4.
NOTE: The minimum calibration value is 2 mg/L. In addition, the calibration is limited to ±40% adjustment of the factory default value to prevent erroneous calibrations.
5. SETUP FUNCTIONS Use the setup feature to customize your instrument operation. There are two setup menus; one menu is derived from the % saturation mode and the other from the mg/L (or ppm) concentration mode. First, select the appropriate measurement mode you wish to adjust by pressing until the desired units are displayed. During for 5 seconds to enter SETUP measurement, press and hold mode of the parameter being measured. Press or to change programs or change options.
Press to view Offset % (OFS)—% saturation mode only. 5.3 3.0 ConF (Configuration) Press to access set-up programs 3.1 thru 3.5. 5.4 3.1 rdY (Ready Stability Indicator / Auto Hold) Press . Press or Auto HOLd. Press to choose READY “On”, READY “OFF”, or to confirm. 5.5 3.2 ºC ºF (Celsius or Fahrenheit) Press . Press or Press to select ºC or ºF. to confirm. 5.6 3.3 dPr (Barometric Pressure Adjustment) Press . Press or Press Press to select units; Hg (mm Mercury) or bAr. to confirm.
5.7 3.4 SALt (Salinity Adjustment) For best accuracy, enter the actual salinity value if your samples are at least 0.1 ppt (100 ppm). Maximum adjustment is 50 ppt (50,000 ppm or 5% salt). Press . Press or to adjust the value (in parts per thousand). Tip: 0.1 ppt = 100 ppm salinity to confirm. Press 5.8 3.5 OFS (Offset Adjustment) from % mode Use this feature to offset the meter’s value to another DO meter. Using the % saturation mode, observe the reading a sample solution after it has stabilized.
5.10 4.0 rSt (Reset) Press . Press or to select “Yes” (Reset) or “No” (Cancel). If “Yes”, press or to select “Cal” (calibration reset only) or “FCt” (complete reset to factory default settings). Press to confirm. 5.11 5.0 CLr (Clear Stored Memory) Press . Press or Press to select “Yes” (Erase memory) or “No”. to confirm.
6. TAKING MEASUREMENTS During measurement the dissolved oxygen reading is automatically compensated for pressure and salinity. For best accuracy, ensure the pressure and salinity settings are adjusted accordingly from the setup menu. The factory default value for barometric pressure is 760 mm Hg or 101.3 bar (sea level). The factory default value for salinity is 0.0 ppt (no salinity). See Section 5.6 — Barometric Pressure Adjustment. See Section 5.7 — Salinity Adjustment.
6.1 HOLD Function during For prolonged observation of a reading, press measurement mode to freeze the display. The “HOLD” indicator will display when the reading is held. To release the held value and resume measurement, press memory by pressing again or insert the held value into . 6.2 Storing and Recalling Data The DO 700 can retain up to 100 data points into memory for later retrieval. to insert the measured value 1) In the measurement mode, press into memory.
7. ELECTRODE MAINTENANCE The DO 700 electrode produces an output proportional to the oxygen present in the medium in which it is placed. The galvanic probe design allows for immediate use—unlike the typical 15 minute warm-up period required for polargraphic electrodes. The probe consists of two parts. The upper part consists of the anode, cathode, and dual cable. The lower part consists of a pre-assembled cap, and electrolyte solution.
There are no special probe storage requirements. Cap and Electrolyte Replacement Replacement of the pre-assembled cap is required only when you cannot calibrate the probe, or if the membrane is damaged. Typical membrane damages are punctures or wrinkles caused during measurements or cleaning. 1) Unscrew the cap counter clockwise from the probe sensing tip. 2) 3) Rinse the probe under running water. Mount the nozzle tip onto the syringe provided.
Electrolyte Solution The electrolyte solution in your probe’s cap will deplete on usage and will need to be replaced periodically. The replacement electrolyte solution included with your probe comes premixed and ready to use. To order more electrolyte solution, see Section 9 – Replacements and Accessories.
8. DISSOLVED OXYGEN THEORY Dissolved Oxygen (DO) refers to the volume of oxygen that is contained in water. There are two main sources of DO in water; atmosphere and photosynthesis. Waves and tumbling water mix air into the water where oxygen readily dissolves until saturation occurs. Oxygen is also produced by aquatic plants and algae during photosynthesis.
Measurement Units One measure of DO in water is parts per million (ppm) which is the number of oxygen molecules (O2) per million total molecules in a sample. The “mg/L” unit is equivalent to ppm (a liter of water weighs 1 million milligrams—one part in a million is similar to one milligram in a liter). Calculating the % saturation is another way to analyze DO levels.
Air Calibration Understanding the principle of air calibration is easy, once you know that it is partial pressure that the probe is responding to. When the probe is in air, it is measuring the partial pressure of oxygen in air. If water is air saturated, then the partial pressure of oxygen in the water will be the same as it is in air. Therefore, all you need to know is the temperature of the air in which the probe is placed.
Some pollutants such as acid mine drainage produce direct chemical demands on oxygen in the water. DO is consumed in the oxidationreduction reactions of introduced chemical compounds such as nitrate 11+ 22(NO3 ) and ammonia (NH4 ), sulfate (SO4 ), and sulfite (SO3 ) and + + ferrous (Fe2 ) and ferric (Fe3 ) ions. These are important consideration for water and wastewater treatment industry.
9. REPLACEMENTS AND ACCESSORIES Part number Ordering Code Item Description Eutech Instruments Oakton Instruments DO 700 meter with DO/ATC probe and 1-m cable, (2) Pre-assembled caps, electrolyte, integral stand, & 100/240 VAC adapter. ECDO70042S 01X543501 35415-00 DO/ATC probe, 1-m cable, (2) Preassembled caps, electrolyte, & plastic syringe. DO6HANDY 01X233913 35642-50 DO/ATC probe, 3-m cable, (2) Preassembled caps, electrolyte, & plastic syringe.
10. TROUBLESHOOTING GUIDE PROBLEM No display CAUSE SOLUTION Main power not switched on. AC Adapter socket not inserted properly. Switch on the power supply. “Ur” (Under range) DO or Temperature value is out of range. Confirm measurement condition, ensure temp is within range. “Or” (Over range) Probe is not connected. Check electrode connections. in primary or secondary display Electrode dirty or broken. Check electrode-add electrolyte &/or replace membrane. Meter not calibrated.
PROBLEM CAUSE SOLUTION CAL % calibration value is not acceptable. Electrode is disconnected or failing. Check electrode connections. Check that correct DO unit is selected & repeat cal procedure. Service electrode. Reset meter. Replace electrode. CAL ppm or mg/L calibration is attempted when the factory calibrated absolute value is below 2.00 Use concentration calibration solution higher than 2.00. Check electrode connections. Check that correct DO unit is selected & repeat cal procedure.
11. SPECIFICATIONS DO % Saturation Range Resolution Relative accuracy Offset adjustment Calibration Points DO mg/L or ppm Range Resolution Relative accuracy Calibration 0 to 300% 0.1 % (0.0 to 199.9%); 1% (200 to 300%) ± 0.5% of value ± 10.0% of reading (2 points) 100% in saturated air or air-saturated water, 0% in zero oxygen solution 0.0 to 30.0 0.01 ± 0.5% of value (1 point) ± 40% from the factory default value. Minimum reading allowed is 2.00.
12. WARRANTY This meter is supplied with a warranty against significant deviations in material and workmanship for a period of THREE years from date of purchase whereas probe with a SIX month warranty. If repair or adjustment is necessary and has not been the result of abuse or misuse within the designated period, please return – freight prepaid – and correction will be made without charge. Eutech Instruments/Oakton Instruments will determine if the product problem is due to deviations or customer misuse.
13. RETURN OF ITEMS Authorization must be obtained from our Customer Service Department or authorized distributor before returning items for any reason. A “Return Material Authorization” (RMA) form is available through our authorized distributor. Please include data regarding the reason the items are to be returned. For your protection, items must be carefully packed to prevent damage in shipment and insured against possible damage or loss.
For more information on our products, please contact our channel partner or visit our websites listed below: Oakton Instruments 625 E Bunker Court Vernon Hills, IL 60061 USA Tel: (1) 888-462-5866 Fax: (1) 847-247-2984 info@4oakton.com www.4oakton.com Eutech Instruments Pte Ltd Blk 55, Ayer Rajah Crescent, #04-16/24 Singapore 139949 Tel: (65) 6778 6876 Fax: (65) 6773 0836 eutech@thermofisher.com www.eutechinst.
