User's Guide ExStik® DO600 Dissolved Oxygen Meter II RECALL Dissolved Oxygen DO600
Introduction ® Congratulations on your purchase of the ExStik DO600 dissolved oxygen / temperature meter which simultaneously displays dissolved oxygen and temperature. Units of measure are % saturation, mg/l or ppm for dissolved oxygen, and °C or °F for temperature. Advanced features include Data Hold, 25 points memory, auto power off, automatic temperature compensation, salinity and altitude compensation.
Operation® Powering the ExStik® ® The ExStik uses four (4) CR2032 Lithium Ion Batteries. Press the ON/OFF button to turn the meter on or off. If the batteries are weak, the ‘BAT’ indicator appears on the LCD. The ® auto power off feature shuts the ExStik off automatically after approximately 10 minutes of inactivity. The auto power off feature may be temporarily disabled for convenience or for extended polarization time.
Calibration 1. 2. 3. 4. 5. 6. 7. 8. Calibration should be performed on a daily basis. Turn the meter ON Press and hold the MODE/HOLD button until % is displayed on the LCD. Allow the electrode to fully polarize. (readings are stable) Place the electrode cap onto the electrode. The sponge contained in the cap should be moistened (not soaked) with DI (distilled water) or clean tap water. Be sure that the electrode membrane is clean and dry or the calibration will be incorrect.
Altitude Compensation 1. 2. 3. 4. With the unit ON, momentarily press the CAL/RECALL button twice in quick succession (‘SAL’ is shown in the lower temperature display. Press and hold CAL/RECALL again for 2 seconds to enter the Altitude Mode (‘Ald’ will be shown in the lower temperature display). The factory default value is sea level. Each press of the MODE/HOLD button increases the compensation by 1000ft. The maximum value is 20 presses (20,000ft above sea level).
Measurement and Display Considerations • • • • The DO600 uses a polarographic sensor, which consumes oxygen at the sensing surface. This requires a constant movement of the sample across the membrane to maintain a constant dissolved oxygen level. It is recommended that the probe be moved in the sample as the measurement is made, or if in a laboratory environment, the sample be stirred using a stir plate. If the unit appears to be locked (display frozen).
DO Bonded Membrane Cap replacement Important Note : Do not touch the membrane as skin oils will interfere with the oxygen permeability rate of the membrane. Use caution when replacing the bonded cap. 1. It is recommended that the electrode remain attached to the meter during this replacement process. 2. To remove the bonded cap from the electrode, unscrew the cap firmly and carefully counter-clockwise from the electrode (see diagram below). 3. Discard the used cap.
Specifications Display 2000 count, Dual function 3 ½ digit LCD with Bargraph, Display size: 24 mm x 20 mm Sensor Polarographic type Membrane Bonded membrane cap with threaded fitting Operating Temp.
Appendices Troubleshooting Guide Symptom Unit will not power on “BAT” indicator shown on display Unstable Readings Readings drift down Slow Response Electrode cannot be calibrated Electrode cannot be calibrated after replacing the electrolyte and membrane cap Sample reading is frozen Possible Causes -Batteries not in place -Dead batteries -Battery polarity incorrect -Batteries are weak -Insufficient electrolyte in probe (Air bubbles present when probe is inverted.
Operational Matrix for the Model DO600 Function / Resulting Action On/Off Water Saturated Air Calibration Zero Calibration Power Status Any On Mode Setting Any Any Required Button Press Sequence Comments On Any Place Electrode in Zero Solution, wait for stability Press & hold CAL/RECALL button for 2 seconds On Any Momentary press of the MODE/HOLD button On While In Hold Mode Momentary press of the MODE/HOLD button Momentary press of the ON/OFF button Place Electrode in Calibration Cap Press &
Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact information.
