STARTER 300D Portable DO Meter EN
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9
4
STARTER 300D OPERATION
WARNING
Do not operate the equipment in hazardous environments. The
equipment is not explosion protected.
WARNING
When using chemicals and solvents, comply with the instructions of the
chemical producer and the general lab safety rules.
4.1
Calibration
4.1.1
Zero-oxygen solution
The
STARTER 300D
allows you to perform 1-point or 2-point calibrations; normally a 1-point
calibration is enough. The 2-point calibration which is rarely performed must be run in a zero-
oxygen solution.
Preparing a zero-oxygen solution
: put approximately 20ml of pure or deionized water into the
bottle of DO Zero Oxygen Chemical (30059257, there are about 5g powder in it), stir for at least 5
minutes. The solution is now prepared.
4.1.2
Performing 1-point calibration
When performing calibration, Ohaus recommends using Auto End Point Mode. After powering the
meter on, be sure the top of the screen shows
to ensure the meter is in Auto End point
Mode.
Auto or Manual End point Mode:
o
Press and hold
to change the
End Point Mode
.
o
When in Manual Mode, to manually reach a pH measurement or calibration value,
you need to press button-
when reading is stable and displays
: then the
sample reading or calibration value freezes,
blinks 3 times and freezes on
the display.
o
When in Auto End Point Mode, the meter determines when the reading is stable
then displays and locks the reading or calibration value automatically, the reading
freezes and blinks 3 times then disappears;
blinks 3 times and freezes on
the display.
Before performing calibration, you must enter the
correct
barometric pressure in the meter (see
3.1). Please keep in mind the variation of barometric pressure depending on location, altitude,