user manual

“Open Air” Calibration Procedure
for the MW600 Dissolved Oxygen Meter
1. Take the membrane off the end of the probe and dry the diode off.
2. 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
3. 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 )
4. Screw the membrane on to the probe.
5. 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. )
6. 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
Hope this information is helpful
Milwaukee Instruments Technical Department