6
9) After filling the electrolyte solution and screw the membrane cap, please find the insulation tape to seal the
seam of the sensor head to reduce solution leakage, please refer to the picture below:
Insulation tape
10) Check the membrane module to see whether there are air bubbles in it. If found there are air bubbles, knock on the
membrane cap carefully to dispel them.
11) Inspect the membrane to ensure that the inner cathode element contacts the membrane. The membrane must be
taut, without wrinkles or imperfections. <If wrinkles are found, please follow
2)
to change the membrane.
12) Connect DO electrode with Meter DO BNC connector.
13) Rinse the assembled electrode with distilled water and blot dry with a clean lab wipe.
C) DO calibration C-1) or C-2) or C-3) :
There are three ways to do the DO calibration, for common and convenient way, follow c-1.
For more accurate measurement, follow c-2 and c-3 with necessary devices and solution in laboratories.
NOTE:
First doing zero DO calibration and then doing 100% air-saturated water calibration.
C-1) 100% Water-Saturated Air Calibration:
(Convenient for self-calibration, common used)
1) Connect the electrode to the meter.
2) By positioning the sensor in air-saturated water (air is directed through water until the water is saturated
with it). The illustration below is a representation of the conditions in air- saturated water.
3) Press and hold
MODE+CAL
buttons to enter calibration mode, screen shows “DO %100” then press and hold
SET
button to save and screen shows “
SA
” to complete calibration. Press and hold
MODE+CAL
buttons, screen
shows “
ESC
” momentarily and return to normal measurement mode.
