Dissolved Oxygen

Description:

Dissolved oxygen measures just that. The amount of Oxygen available in the water for living things. The more the better. Below 3 mg/L and it is unsuitable for most living things with gills.

Name of Device:

Milwaukee MW 600

Batteries:

1x 9V battery

Use:


      1. Remove protective cap by pulling it straight out.

      2. Turn probe on using the ON/OFF button.

      3. Immerse black end of probe in a container or bucket of sampled water (not provided). Have one student with probe, one with meter.

      4. Probe should be slowly and constantly moving in a figure 8 pattern at a rate of 30cm per second.

      5. Wait for readings to stabilize (1-2 minutes) and record dissolved oxygen level in mg/L.

      6. Rinse end of probe and membrane and cover with protective cap.

      7. Turn off probe.

      8. Rinse probe and cap with distilled/deionized water and dry outside black portion after daily use.


Note: Make sure probe end is full of electrolyte solution before use or calibration by inverting probe upside down to see if air bubbles surface. If they do, unscrew black membrane cap, assure oring is seated and undamaged, and fill to just under o-ring with supplied electrolyte solution. Rescrew on making sure to tap as you go to release air bubbles until tight. Recheck by inverting.



Long term Storage:

  • For Long term storage (2+ months), remove battery,

  • remove membrane cap,

  • rinse and air dry completely for 24 hours,

  • then cap dry using the red storage cap.


Calibration:

  1. Take the membrane off the end of the probe and dry the diode off.

  1. Connect the probe to the base unit and turn the unit on. Your display should read 0.0 if it does not -- go to the position "0" screw on the front of the unit with the screw driver provided and through the access hole make the unit display read 0.0

  1. * Go to the membrane and put the "O" ring inside the membrane on the shoulder at the base of the threads. Fill the membrane to just short of the "O" ring with MA9071 electrolyte solution. Be sure that there are no bubbles inside the membrane. ( Air bubbles are the main cause of calibration failure.) Tap the membrane on a hard flat surface multiple times to dislodge any air bubbles.

  1. Screw the membrane on to the probe.

  1. Turn the meter on and hang the probe off the end of a table pointing down and let the unit display stabilize (this may take 5 to 15 min.)

  1. Push down and hold the "Cal” button on the front face of the meter and with the screwdriver go to the front Cal position "100%" and make the display read 100.


You are now calibrated -- Watch for the membrane having wrinkles or stretch marks -- if you see these - replace with a new membrane. Always use fresh electrolyte solution model # MA9071.


Note: Make sure probe end is full of electrolyte solution before use or calibration by inverting probe upside down to see if air bubbles surface. If they do, unscrew black membrane cap, assure oring is seated and undamaged, and fill to just under o-ring with supplied electrolyte solution. Rescrew on making sure to tap as you go to release air bubbles until tight. Recheck by inverting.

Manuals:


MW 600 Manual


Calibration Update Primer