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STARTER 300D Portable DO Meter
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
Mode.
Auto or Manual End point Mode:
Press and hold
o
When in Manual Mode, to manually reach a pH measurement or calibration value,
o
you need to press button-
sample reading or calibration value freezes,
the display.
When in Auto End Point Mode, the meter determines when the reading is stable
o
then displays and locks the reading or calibration value automatically, the reading
freezes and
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,
to change the End Point Mode.
when reading is stable and displays
blinks 3 times then disappears;
to ensure the meter is in Auto End point
blinks 3 times and freezes on
blinks 3 times and freezes on
EN
9
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: then the
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